Glossary

In full

A physical change to a building that already exists — adding or expanding square footage, for example.

The statute defines alteration broadly, as an activity or action that causes a direct physical change to existing property, and then excludes maintenance, repair and replacement from it in a separate subdivision. Alteration is therefore a residual: work is tested against the other three first, and only what none of them covers can be alteration. Because those three carry no threshold at any contract size, identifying work correctly as one of them removes the threshold question entirely.

Alteration status is lost, and the work becomes Modification taxable under prime contracting, where the amount is more than 25% of the parcel's most recent full cash value on residential property, or more than $750,000 on all other existing property. Full cash value is measured as of the bid date or the contract date, whichever value is higher.

Two things about that boundary. The statute removes alteration status only where the amount is more than the threshold, so a contract at exactly 25% keeps it; ADOR's written response of 2026-08-13 states the same test inclusively, while the MRRA Contracting page describes alteration as work "below" the threshold, which would exclude a contract at exactly 25%. And the residential measure is full cash value, not the property's tax value as that page and the Contracting FAQ describe it. The statute and the written response govern on both points.

On a contract that mixes alteration with maintenance, repair or replacement, only the alteration charges are compared with the threshold. The statute tests "the contract amount"; ADOR Tax Policy stated in writing on September 30, 2026 that the phrase refers to contracts that are purely alteration, and that a mixed contract is tested on its itemized alteration charges, as ADOR's Evaluating Mixed Construction Contracts worksheet does at steps 3a and 3b. Maintenance, repair and replacement carry no threshold, so their charges never count toward it. The answer covers the commercial $750,000 threshold as well as the residential one.

In full

One of the parts of a compound or complex whole, helping to make up the whole of something. A component may itself be part of a system. ADOR's examples are replacing the faucets on a sink, or replacing a sink in a bathroom.

The term carries no independent tax consequence. It exists because the statutory definition of replacement is built on three objects — a component, a system, or tangible personal property installed in existing property — and identifying a charge as work on one of the three is what makes it replacement rather than alteration.

That is the whole of its usefulness, and it is considerable: replacement carries no threshold at any contract size, while alteration does.

In full

Existing property is real property that already carries prior construction. It decides which treatments are available at all: MRRA can exist only on existing property, and work where nothing previously existed is Modification.

The term does a great deal of work and the statute never defines it. A.R.S. § 42-5075 uses it in the definition of alteration at (S)(1), in the definition of replacement at (S)(11), and in the MRRA exclusion itself at (P) — and in the definition of modification at (S)(6)(b) — while (S) itself defines alteration, contracting, contractor, manufactured building, manufactured building dealer, modification, modify, owner, prime contracting, prime contractor, replacement and sale of a used manufactured building, twelve terms, without reaching this one.

What fills the gap is ADOR's illustration rather than statutory text. A newly built block wall is not existing property while it is being built; stuccoing that same wall a month later is work on existing property. The same physical object moves from one side of the line to the other once its own construction is complete.

That has a consequence on a single project. Work performed on a structure during its original construction is part of that construction, not maintenance of it, however much it resembles maintenance in isolation.

In full

The upkeep of property or equipment. ADOR's examples are topping off fluids in an HVAC system, re-staining a wood deck, and refinishing hardwood floors.

There is no statutory definition. A.R.S. § 42-5075(S) defines alteration, modification and replacement, and leaves maintenance to ADOR's MRRA Contracting page and the Evaluating Mixed Construction Contracts worksheet, which carry the same wording.

The four MRRA activities are tested in order. Work is checked against maintenance, repair and replacement first, and only work that none of those covers can be alteration. Maintenance carries no threshold at any contract size, so identifying work correctly as maintenance removes the threshold question from the contract entirely.

Maintenance performed on existing property is MRRA. Tax attaches to the materials the contractor buys rather than to the contract.

In full

Land and everything permanently attached to it. A.R.S. § 42-5075 uses the term throughout — the MRRA exclusion applies to a contract with the owner of real property, and modification means work on structures on it — and never defines it.

The distinction that matters to a contractor is between materials incorporated into real property and tangible personal property installed in existing property. Incorporated materials lose their separate identity and become part of the realty. Installed personal property can still be identified after installation, keeps its character, and can be removed in essentially the same form.

Which side a transaction is on decides the classification. A retailer who sells materials and arranges to install them into real property is a contractor for that transaction. The same retailer installing into tangible personal property — a vehicle, for instance — stays under the retail classification, and separately stated installation labor there is a service in addition to the sale.

The property tax chapters do supply a definition, but of a different term and for a different purpose. A.R.S. § 42-11001(13) defines real estate, and scopes that definition to chapters 11 through 19 of title 42, which are the property tax chapters and not the transaction privilege tax chapter.

One asymmetry is worth carrying. The statutory definition of replacement reaches both a component or system of existing property and tangible personal property installed in existing property, so an item that never became part of the realty can still be the subject of MRRA work.

In full

Returning existing property to a usable state from a partial or total state of inoperability or non-functionality. ADOR's examples are fixing a leaky bathtub or shower, and repairing hail-damaged windows and roof tiles by replacing them.

That last example is worth pausing on. Physically swapping an item out can be repair rather than replacement. What separates the two is the starting condition: repair restores something that had stopped working, while replacement removes a component, system or installed item from service and installs one with the same, similar or upgraded function, working or not.

The distinction rarely changes the tax outcome, because neither carries a threshold at any contract size. It matters when charges are sorted into activity buckets on a mixed contract, where each charge is assigned to the activity it actually belongs to.

There is no statutory definition. A.R.S. § 42-5075(S) defines alteration, modification and replacement, and leaves repair to ADOR's MRRA Contracting page and the Evaluating Mixed Construction Contracts worksheet.

Work is checked against maintenance, repair and replacement first. Only work that none of those covers can be alteration.

In full

Taking out something that is already there and putting in something that performs the same function, or an upgraded one. The upgrade still counts as replacement, which surprises most people, and the contract size does not matter.

Defined as removal from service of a component, a system, or tangible personal property installed in existing property, including machinery or equipment, and installation of one providing the same, a similar or an upgraded design or functionality. The statute applies this regardless of the contract amount and regardless of whether the old item is physically removed from the existing property.

ADOR states the physical-removal point more narrowly than the statute does. The MRRA Contracting page allows the old item to stay in place only where it remains non-operational and removing it makes no sense or is not possible. The statute attaches no such condition. Where they diverge the statute governs, and the practical case that separates them is an item removed from service and left in place where removing it was entirely feasible.

One contract may contain more than one replacement. Because replacement carries no threshold, correctly identifying work as replacement rather than alteration removes the threshold question entirely.

In full

A regularly interacting or interdependent group of items, or components, forming a unified whole. ADOR's examples are a roofing system, which includes shingles, lining and nails; an HVAC system, which includes the heating and cooling unit, air filtration, furnace or boiler and ducting; and a plumbing system, which includes sink bowls, handles, faucets and pipes.

The practical value is scope. Re-roofing a house is replacement of a system, not a series of separate repairs, and replacement carries no threshold. The same work described as an improvement to the building rather than as replacement of its roofing system would be tested as alteration against a threshold instead.

The term carries no independent tax consequence. It is one of the three objects the statutory definition of replacement is built on, alongside component and tangible personal property installed in existing property.

In full

Property affixed or installed into existing real property that can still be identified after installation, that does not lose its character, and that can be removed in essentially the same form. ADOR's example is machinery and equipment attached to the property.

The contrast is with materials incorporated into real property. Lumber, concrete, wire and pipe stop being separate things once they are in place. A machine bolted to a slab does not.

The distinction earns its place because the statutory definition of replacement reaches this category expressly, alongside a component and a system. Removing an installed machine from service and putting in one with the same, similar or upgraded functionality is replacement, and replacement carries no threshold at any contract size — even though the item was never part of the realty.

The same words mean something different elsewhere in contracting tax. Installing tangible personal property into real property is contracting; installing it into other tangible personal property, a vehicle for instance, is a retail sale with a service attached. The category here is about what an item remains after installation, not about which classification the installer reports under.

In full

A taxpayer claiming a deduction establishes entitlement to it, and A.R.S. § 42-5009 gives two routes. Under subsection (A), the seller marks the invoice and obtains a completed certificate from the purchaser. Under subsection (B), a person who did not do that may still establish entitlement by presenting the facts necessary to support it, but the burden of proof is on that person.

In an audit the same rule appears as a practical one. Where the taxpayer does not obtain a properly completed exemption certificate, ADOR states that the taxpayer shall have the burden of proof to establish the required information.

The certificate is not the entitlement. It is the evidence, and a taxpayer who lost it has not lost the deduction — only the easy way of proving it.

One contracting provision reverses the direction. A.R.S. § 42-5075(S)(1)(c) places the burden on the Department where it asserts that a contract was artificially separated, so a contractor who wrote two genuine contracts is not required to prove a negative.

A certificate accepted in good faith also moves the burden between the parties rather than removing it. Under § 42-5009(O), a vendor who accepts in good faith is relieved of the burden of proving entitlement, and the purchaser may then be required to establish the accuracy of the claimed exemption.

In full

The Intent to Audit Letter formally opens an audit. ADOR's sequence is that an auditor receiving the assignment contacts the taxpayer, a mutually agreed time for an opening interview is set, and the letter is then sent together with an opening interview confirmation letter to officially begin the audit.

The order matters more than the letter does. By the time the letter arrives, contact has already been made, and contact is the event that ends eligibility for the Voluntary Disclosure Program. ADOR states that a taxpayer is only eligible to apply if the Department has not already made contact regarding an audit, a non-filer notice or an enforcement investigation.

So a contractor weighing whether to come forward is not weighing it against the letter. The decision closes at the first call.

The letter itself is procedural. It confirms that an audit has begun, and the examination of records follows from there.

In full

The look-back period is the span of past periods an audit actually examines. ADOR states that an audit normally covers the most recent four-year period.

Normal is a practice, not a limit. What sets the outer boundary is the statute of limitations, and where no return was filed for a period, A.R.S. § 42-1104(B)(1)(b) sets no boundary at all.

The phrase carries a second and more useful meaning in the Voluntary Disclosure Program, where a limited look-back period is the benefit being offered rather than a description of an auditor's habit. There the standard period is four years from the date the application is submitted, and the agreement includes a waiver of the Department's ability to audit periods before it.

The two senses point in opposite directions. In an audit the look-back is what the Department chooses to examine and can extend. In a voluntary disclosure it is what the Department agrees to give up.

For a contractor several years behind, that difference is the whole decision.

In full

A Managed Audit allows a business to review its own invoices, checks and accounting records under the Department's guidance to determine what is owed for specific tax types. It is one of two programs ADOR groups under disclosure and compliance.

It is aimed at a currently registered business that wants to check its own records and fix errors. That is a different taxpayer from the one the Voluntary Disclosure Program is for.

The benefits are specific and they are not the same as the other program's. Interest is removed. Penalties are waived. The right to protest the results is retained.

That last point is the one that separates the two programs. A voluntary disclosure agreement is final, and a managed audit is not.

Transaction privilege and use tax is eligible, as is corporate income tax. Individual income tax and withholding tax are not.

Participation is not automatic. A formal application must be submitted and accepted before any penalty or interest relief follows, and an applicant who does not meet the conditions is denied.

In full

A proposed assessment is the Department's notice of its determination of a deficiency. A.R.S. § 42-1108(B) provides that the deficiency, plus penalties and interest, is final forty-five days after the date of receipt of the notice unless an appeal is taken.

Receipt, not mailing, starts the clock for transaction privilege tax. The statute sets the individual income tax period at ninety days after the date of mailing, which shows the distinction is deliberate.

Once the assessment is final, subsection (D) requires the Department to mail a notice and demand, and the amount is due and payable ten days after the date of that notice.

A separate category is easy to mistake for a proposed assessment and carries none of the same rights. Under subsection (F), tax in excess of what the return disclosed that is due to a nonaudit adjustment is not a deficiency assessment, and the taxpayer may not protest or appeal it as one.

Subsection (G) lists nine such adjustments. Several are the kind of thing a contractor does routinely: an entry inconsistent with a schedule filed with the return, an omission of information required to substantiate an entry, and a deduction or credit that is not authorized by statute for the taxable period.

That last one reaches a retired deduction code claimed for a period after it expired, which is why the code's availability window matters as much as the code.

In full

A taxpayer who disagrees with an audit's findings has forty-five days from the receipt date of the proposed assessment to file a timely appeal. An appeal form accompanies the assessment, the protest must be in writing, and it must state the reasons the assessment, tax, interest or penalties are incorrect.

The same period appears in the statute from the other direction. A.R.S. § 42-1108(B) makes the deficiency final forty-five days after receipt of the notice unless an appeal is taken, so the window and the finality are one event described twice.

Receipt starts it. Mailing does not.

Two situations are outside the window entirely. A nonaudit adjustment under § 42-1108(F) is not a deficiency assessment and may not be protested or appealed as one, however wrong it looks. And a Voluntary Disclosure agreement is final by its terms, which is the trade the program makes for its limited look-back.

A Managed Audit keeps the right to protest the results, which is one of the ways it differs from a voluntary disclosure.

In full

A.R.S. § 42-1104(A) requires a notice of additional tax to be mailed within four years after the return was required to be filed, or within four years after it was filed, whichever expires later. Filing late therefore extends the Department's window rather than starting it sooner.

Subsection (B) lists the exceptions, and one of them governs most catch-up work. Under (B)(1) the Department may assess or begin a collection proceeding at any time in the case of a false or fraudulent return with intent to evade, in the case of failure to file a return for any tax administered under title 42 other than income tax and withholding tax, and in the case of failure to file an income or withholding return where intent to evade is shown.

Transaction privilege tax is administered under title 42 and is neither income tax nor withholding tax. A period for which no return was filed therefore has no limitation period and never acquires one.

The legislature drew the contrast itself. Paragraph (B)(10) gives the Department seven years to assess where an income or withholding return was not filed. No equivalent paragraph exists for transaction privilege tax.

One further exception reaches a filed return. Where the taxpayer omits an amount properly includible that exceeds twenty-five percent of the gross income stated on the return, (B)(2) allows assessment within six years.

A contractor who has never filed is carrying exposure with no end date. The route that ends it is the Voluntary Disclosure Program, and eligibility for that closes the moment the Department makes contact.

In full

Where an audit finds a claimed exemption with no certificate behind it, ADOR's stated practice is that the auditor gives the taxpayer forty-five days from the request for substantiation to do one of two things: obtain a fully completed exemption certificate that was statutorily available on the date of the transaction, applicable to the item purchased, reasonable for the purchaser's type of business and correct for the jurisdiction the transaction is sourced to; or obtain other information establishing that the transaction was not subject to tax.

The relief is stated in mandatory terms. If the taxpayer obtains either, the auditor shall relieve the taxpayer of any liability for the transaction tax, unless the audit shows the taxpayer had knowledge of false information relating to the claimed exemption.

The certificate must have been available on the transaction date. A certificate that did not exist then cannot be produced now to cover it, so the cure is a documentation cure and not a reclassification.

A taxpayer who does not obtain a properly completed certificate carries the burden of proof to establish the required information by other means.

What makes the rule worth knowing is where it lives. A.R.S. § 42-5009 states the certificate framework and the fallback burden of proof, and states no period and no entitlement to relief on producing a certificate later. The forty-five days and the relief that follows appear in ADOR's audit guidance.

It is also not the protest window, which is a different forty-five days measured from a different event.

In full

A transaction privilege tax audit is the Department's examination of a taxpayer's books, records and returns to determine whether the correct amount of tax was reported. ADOR states that businesses selected are not singled out and that an audit does not mean a business has been reporting incorrectly.

The sequence is published and it does not vary much. An auditor makes contact, an opening interview is scheduled, the Intent to Audit Letter and an appointment confirmation follow, records are examined, a transaction detail schedule is reviewed with the taxpayer, a closing conference presents draft results, and a proposed assessment issues.

Three areas are examined on every contracting audit: income, for correct amounts and classifications; exemptions and deductions, for correct amounts and documentation; and purchases, for retail or use tax paid on capital assets, supplies and articles manufactured for the taxpayer's own use. That third area is where the retail equivalent on MRRA materials is tested.

Electronic records are preferred and sampling is common. Where records are not produced, the escalation runs from a reasonable period to a supervisor, then a written request by certified mail, then a subpoena requiring departmental approval.

Two deadlines of the same length run at different points and are not the same deadline. Confusing them is expensive in opposite directions.

ADOR states its own precedence on the page: where anything on the site is inconsistent with the statutes, the Model City Tax Code or the Arizona Administrative Code, those prevail.

In full

The Voluntary Disclosure Agreement program allows a person or business to come forward and address past unmet tax obligations in exchange for stated benefits. Transaction privilege and use tax is eligible.

What it gives is a limited look-back period. The standard is four years from the date the application is submitted, with deviations considered case by case. Penalties are abated once all tax and interest have been paid timely, and the agreement includes a waiver of the Department's ability to audit periods before the look-back period.

That waiver is the substance of the program for anyone who has not filed. A period for which no transaction privilege tax return was filed has no limitation period at all under A.R.S. § 42-1104(B)(1)(b) and never acquires one. For a taxpayer who did file, four years is the ordinary statutory period and the program changes little.

What it costs is interest and finality. Standard interest applies, and the agreement is final — there are no protest rights. Participation is limited to one time per tax type, and no refund may be requested once the case is closed.

Eligibility is the part with a deadline that gives no warning. A person may apply only if the Department has not already made contact regarding an audit, a non-filer notice or an enforcement investigation. Correspondence or notices already received must be disclosed on the application, and prior contact is cause to determine an applicant ineligible. Prior collection activity for any tax type must be satisfied in full before applying.

Applications may be made anonymously.

For transaction privilege tax, the application is accompanied by a TPT Schedule in spreadsheet form, which serves as a substitute for filing returns for each period. It sets out taxable periods, tax jurisdictions, business classification codes, gross receipts, deduction amounts, deduction codes, collected tax amounts and net taxable figures. Two fifteen-day clocks then run: one to provide a license number or application and a Form 285 where applicable, and one to sign the agreement and pay in full.

A taxpayer with undisclosed liabilities in several states may instead apply through the Multistate Tax Commission.

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A change directive is a written order directing a change in modification work before agreement on an adjustment of the guaranteed maximum price or contract time. Arizona defines it in the prime contracting statute, at A.R.S. § 42-5075(O)(1)(d).

The difference from a change order is agreement. A change order is a written instrument issued after a contract is executed that provides for the change in scope, the adjustment to the guaranteed maximum price, and the adjustment to contract time. A change directive orders the work to begin before those are settled.

The distinction matters because Arizona's change-order rules operate on the change order. A change order that directly relates to the scope of work of the original contract is treated the same as the original contract, and the contract amount includes the amount attributable to it. The statute states those consequences for change orders and defines a change directive separately, without stating the same consequences for it.

Administration or supervision of modification work performed under a change directive is a construction phase service. That places it outside the design phase and professional services a contract can exclude from tax under A.R.S. § 42-5075(O).

In full

A change order is a written instrument issued after execution of a contract for modification work. Arizona defines it in the prime contracting statute, at A.R.S. § 42-5075(O)(1)(c), as providing for all of three things: the scope of a change in the modification work or the contract documents, the amount of any adjustment to the guaranteed maximum price, and the extent of any adjustment to the contract time.

Change orders matter for classification because both tests are run on the contract's figures. A change order that directly relates to the scope of work of the original contract is treated as part of that contract, and the contract amount includes any amount attributable to it. Itemized alteration charges initially below the threshold are therefore recalculated with each change order, so a contract bid below the line can be carried above it by later additions.

The 15% test is recomputed the same way. A scope-related change order is folded into the original contract and the percentage is computed again on the combined total; where the result moves the contract across 15%, the new classification applies from the start of the contract. ADOR Tax Policy stated this in writing on September 30, 2026, reading A.R.S. § 42-5075(P)(2) as deciding only whether a change order belongs to the original contract or is a separate one. In ADOR's example, a $200,000 scope-related change order on a $1,000,000 contract is tested on $1,200,000.

A change order that does not directly relate to the scope of work of the original contract is treated as a new contract, and the treatment of any later change order follows the contract whose scope of work it directly relates to. In ADOR's example, a change order for a new HVAC system on the lot next door, added to a $100,000 contract for replacing pipe in a commercial building, is a separate contract, and the original $100,000 is not recomputed.

Administration or supervision of modification work performed pursuant to a change order is a construction phase service, which a contract cannot exclude from tax as design phase services or professional services.

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A Determination Letter is what the Department issues at the end of an MRRA Credit Request review. It is emailed to the prime contractor, to the appointee named on the POA or Disclosure Authorization Form, or to both.

It is not an information letter and it is not a private taxpayer ruling, and the three carry different weight. An information letter is general written advice on how the law applies. A private taxpayer ruling is issued under a statutory process, binds the Department as to the requesting taxpayer, and protects against the tax itself. A Determination Letter decides one credit request on one contract.

Because it closes a specific request rather than answering a question of law, it establishes nothing for any other contract, including another contract of the same contractor.

In full

Final completion is the point at which everything the contract requires has been performed, including the punch list items left outstanding at substantial completion. The meaning comes from construction contract practice, not from Arizona tax law.

A.R.S. § 42-5075(O) uses the term twice without defining it, in the same two places as substantial completion: bounding the punch list at (O)(1)(b), and at (O)(1)(e), where inspection to determine the dates of substantial completion or final completion is a construction phase service.

The gap between the two dates is what the punch list occupies. Work performed in that gap is still modification work, and administering it is still a construction phase service, so a contract cannot treat the period after substantial completion as outside its taxable construction phase.

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An MRRA Credit Request recovers tax already paid on materials when a contract converts from MRRA to Modification. Its statutory basis is A.R.S. § 42-5008.01(D), which entitles a person who paid an amount on property reasonably believed to be within the MRRA exclusion to an offset against the tax liability assessed once a final determination goes the other way.

Only the prime contractor in charge of the contract can claim it, and only where the contract changed to Modification through change orders or incorrect categorization. Where a scope-related change order brings about the conversion, the reclassification applies from the start of the contract, as ADOR Tax Policy stated in writing on September 30, 2026.

The submission: gather an Affidavit of Retail TPT Equivalent Paid by the Subcontractor from every subcontractor, complete one MRRA Credit Summary Workbook per project per request, and email it to the Department with a POA or Disclosure Authorization Form 285, 285B or 285C where someone other than the taxpayer submits. The Department assigns a request number, reviews the calculation, may ask for sample invoices, and issues a Determination Letter.

ADOR states the credit "should be requested within no more than six (6) months" of the change. Whether that is a hard limit or an advisory window is not established by A.R.S. § 42-5008.01(D), which sets no period.

ADOR's published procedure is written throughout around a prime contractor with subcontractors. A contractor working without subcontractors has no affidavits to collect and only their own receipts, and what such a contractor submits instead is not addressed.

In full

A punch list is minor items of modification work performed after substantial completion and before final completion of the project. That definition is statutory, at A.R.S. § 42-5075(O)(1)(b).

The definition exists in the tax statute for one reason. Administration or supervision of modification work performed pursuant to a punch list is a construction phase service, and construction phase services cannot be excluded from the tax base as design phase services or professional services under A.R.S. § 42-5075(O). A contract that separately states its design phase pricing cannot place punch list administration on that side of the line.

The two events bounding a punch list — substantial completion and final completion — are used in the same subsection without being defined anywhere in it.

In full

Reclassification is a contract that began as MRRA becoming a Modification contract before it is finished. The classification is not fixed when the contract is signed.

ADOR names two triggers: change orders, and incorrect categorization of the project. Either one can convert a contract, and the consequences are the same in both cases.

What changes is where the tax attaches. On an MRRA contract the tax attaches to the materials the contractor buys and incorporates. On a Modification contract it attaches to the contract amount under the prime contracting classification. Tax already paid on materials for a contract that converts does not disappear — it becomes recoverable through an MRRA Credit Request.

The remediation sequence ADOR publishes: the prime contractor provides each subcontractor a completed Form 5005 and requires back an Affidavit of Retail TPT Equivalent Paid by the Subcontractor; materials purchased from that point forward are purchased exempt; the prime completes the MRRA Credit Summary Workbook and submits it to the Department.

A scope-related change order reaches the 15% test. The percentage is computed again with the change order included, and where the contract crosses 15%, the reclassification applies from the start of the contract, not from the change order forward. The recomputation runs in both directions, so a contract can also move from prime contracting back to MRRA. ADOR Tax Policy stated these points in writing on September 30, 2026.

The Form 5088 already in subcontractors' hands does not survive the conversion. Note Three of that form provides that the contractor must notify the subcontractor by issuing Form 5005 and that the 5088 notice is automatically revoked.

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Scope of work is what a contract commits the contractor to perform. Two of Arizona's change-order rules depend on it, and the statute does not define it.

A change order that directly relates to the scope of work of the original contract is treated the same as the original contract, regardless of the amount of modification activity the change order contains. A change order that does not directly relate to that scope of work is treated as a new contract, and the treatment of any later change order follows the contract whose scope of work it directly relates to.

The alteration threshold applies the same test. A change order that directly relates to the scope of work of the original contract is treated as part of that contract, and the contract amount includes any amount attributable to it.

So one question — does this change directly relate to the original scope of work — decides both whether a change order inherits the original contract's classification and whether its dollars are added to the contract amount. Neither A.R.S. § 42-5075 nor ADOR's contracting pages define what makes a change directly relate to a scope of work.

In full

Substantial completion is the point at which a project is complete enough for the owner to use it for its intended purpose, with only minor items outstanding. The meaning comes from construction contract practice, not from Arizona tax law.

A.R.S. § 42-5075(O) uses the term twice without defining it. It bounds the punch list at (O)(1)(b) — minor items of modification work performed after substantial completion and before final completion — and it appears at (O)(1)(e), where inspection to determine the dates of substantial completion or final completion is listed as a construction phase service.

So the statute makes the date matter without saying how it is fixed. In practice the date is established by the contract between the parties and by the inspection the statute contemplates at (O)(1)(e), which is itself taxable as a construction phase service.

ADOR's Speculative Builder page describes property outside the enumerated categories as reached prior to completion or before the expiration of twenty-four months after substantial completion. Model City Tax Code §§ 416, 416.1 and 416.2 contain no such clause. The twenty-four-month period in the code runs from substantial completion to Owner-Builder liability at § 417(a), so the term carries a second sense in city tax.

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Cities do not use the state's name for it. Where A.R.S. § 42-5075 calls the classification prime contracting, the Model City Tax Code calls it construction contracting, at § 415, and taxes every construction contractor engaging or continuing in that business activity within the city.

The two track each other closely. The city section carries the same MRRA exclusion and the same de minimis rule — the 15% test — and it imports the state's vocabulary outright: any term the city paragraph does not define that A.R.S. § 42-5075 does define carries the meaning the statute gives it. The city section also carries the same exclusion for work performed by a person not required to be licensed by the Registrar of Contractors.

Two differences are worth holding onto. The state states its base as sixty-five percent of gross income; the city reaches the same result by allowing a thirty-five percent deduction from gross. And sales of manufactured buildings are excluded from construction contracting and taxed under a separate city section, while at the state level a manufactured building dealer is inside the prime contracting classification.

Subcontracting income is exempt from the city tax, but the exemption is conditioned. The city definition of subcontractor requires a written declaration from the contractor, owner-builder, or seller of new manufactured buildings above, stating that party is liable for the tax and supplying its municipal privilege tax license number.

Sections 415 through 418 are the construction contracting article: construction contractors at § 415, Speculative Builder at § 416, Owner-Builder at § 417.

In full

Modification is the activity the prime contracting classification taxes. Where a contract is Modification, tax applies to the contract amount rather than to the materials.

A.R.S. § 42-5075(S)(6) defines it as "construction, grading and leveling ground, wreckage or demolition." The definition carries no qualifier about what the work is preparing for and no threshold of any kind.

That flatness is the point, and it is where intuition goes wrong. Grading a lot is Modification whether or not anything is built afterwards. Demolishing a structure is Modification whether or not something replaces it. A contractor who reasons that grading is only taxable when it precedes construction has read a condition into the statute that is not there.

Three carve-outs follow, and all three run through subsection (P) rather than standing on their own. Modification does not include any project described in (P) — an MRRA contract with the owner. Subdivision (b) reads, as written: "Any wreckage or demolition of existing property, or any other activity that is a necessary component of a project described in subsection P." Whether the necessary-component qualifier reaches the demolition as well as the other activity is not settled by the punctuation; ADOR supplies the reading that it does, and the MRRA Contracting page applies it that way. And it does not include mobilization or demobilization related to such a project, which the statute illustrates as the erection or removal of temporary facilities for the people working on it.

So the same demolition is Modification standing alone and MRRA as the first step of a qualifying repair. What decides it is the contract it belongs to, not the work itself.

An alteration to existing property becomes Modification where the contract amount is more than the applicable threshold. Below or exactly at the threshold, the same work is MRRA.

The statute also defines the verb at (S)(7): to modify is to make a modification or cause one to be made. Causing it is enough, which is how a prime contractor who performs nothing itself is still within the classification.

In full

MRRA stands for maintenance, repair, replacement and alteration. It is the treatment that applies where a contract is outside the prime contracting classification, and the consequence is that tax attaches to the materials the contractor buys rather than to the amount the customer pays. Labor is outside the tax base entirely.

A.R.S. § 42-5075(P) sets three conditions, and all three have to hold.

The contract must be with the owner of the real property or improvements. That is the condition most often missed, and it is wider than it sounds — (S)(8) defines owner to include a tenant, a property manager, an agent of the title holder, and anyone with authority to authorize the work. It also deems a subcontractor hired down a chain from an owner to have been hired by the owner, so the exclusion survives the chain.

The work must be maintenance, repair, replacement or alteration of existing property. Work where nothing previously existed cannot be MRRA at all.

And the contract must not include modification activities, except that a de minimis amount does not subject the contract or any part of it to tax. The statute sets no figure; ADOR supplies the 15% test.

Maintenance, repair and replacement are MRRA at any contract size. Alteration is MRRA unless the contract amount is more than the applicable threshold — 25% of the most recent full cash value on residential property, or $750,000 on everything else. A contract at exactly the threshold keeps its alteration status, because the statute removes it only above.

The tax on the materials is not part of this section. A.R.S. § 42-5075(P)(1) points at § 42-5008.01, which imposes an amount equal to retail tax on tangible personal property incorporated into an MRRA project.

In full

An Owner-Builder is an owner of real property who improves it and does not sell it — an owner who acts as their own contractor, or hires contractors and takes the tax liability on themselves. The tax is imposed by Arizona cities and towns under Model City Tax Code § 417. There is no state or county Owner-Builder classification.

The distinction from a Speculative Builder is the sale and the clock. An owner who improves property and sells it is a Speculative Builder. An owner who still holds it twenty-four months after the improvement is substantially complete becomes liable as an Owner-Builder at that point.

The base is narrower than it first appears, and this is the part most easily got wrong. It reaches two things: the gross income realized by those construction contractors to whom the owner-builder gave a written declaration that they were not responsible for the taxes, and the purchase of tangible personal property incorporated into the improvement, computed on the sales price. Work done by a contractor who was never given such a declaration — and who therefore paid the tax itself — is not in the owner-builder's base.

In practice the declaration is Form 5005 and the exempt materials purchase is Form 5000. A TPT licensed owner who hands contractors a Form 5005 and buys materials exempt on a Form 5000 has done both of the things that create the liability, and the liability arises at the end of the twenty-four months.

All amounts subject to the tax take a thirty-five percent deduction. For periods from and after July 1, 2008, the portion attributable to the actual direct costs of providing architectural or engineering services incorporated in a contract is outside the tax.

State and county obligations do not disappear while the clock runs. Whatever is due under the retail and prime contracting classifications is still due when it is due.

In full

Prime contracting is a business classification, not a person. A.R.S. § 42-5075(S)(9) defines it as engaging in business as a prime contractor. What the classification does is set the tax base.

The order of operations is stated in the statute and is easy to reverse. A.R.S. § 42-5075(B) sets the tax base at sixty-five percent of gross proceeds of sales or gross income, then provides that the enumerated amounts "shall be deducted from the gross proceeds of sales or gross income before computing the tax base." Statutory deductions come off first; the sixty-five percent is taken on what remains.

The classification covers two businesses rather than one: prime contracting itself, and the business of manufactured building dealer.

Three things are outside it. Work performed by a person who is not required to be licensed by the Registrar of Contractors under A.R.S. § 32-1121. A subcontractor's income, where the subcontractor can demonstrate the project was within the control of a prime contractor liable for the tax. And a contract with the owner of real property for maintenance, repair, replacement or alteration of existing property, provided the contract includes no more than a de minimis amount of modification activity — the 15% test.

One exception runs the other way. A contract that primarily involves surface or subsurface improvements to land and is subject to the public procurement provisions of A.R.S. title 28, chapter 19, 20 or 22 or title 34, chapter 2 or 6 is taxable under prime contracting even where it would otherwise be MRRA, and even if it also includes vertical improvements.

That exception is itself limited. It does not apply to contracts with community facilities districts, fire districts, hospital districts, county jail districts, county stadium districts, revitalization districts or the other special districts listed at (Q)(1), nor to any special taxing district outside that list that does not substantially engage in modification, maintenance, repair, replacement or alteration of surface or subsurface improvements to land.

Reported under business code 015.

In full

The retail classification is comprised of the business of selling tangible personal property at retail. The tax base is the full gross proceeds of sales or gross income, with none of the reduction prime contracting gets.

It reaches a contractor in three ways.

Materials. On an MRRA project the tax attaches to materials rather than to the contract. Where the contractor pays the vendor at the register, the vendor is the party taxed under the retail classification and the contractor is simply the purchaser. Where the contractor buys exempt instead, what the contractor later remits is an amount equal to retail transaction privilege tax under A.R.S. § 42-5008.01 — the retail equivalent — which is a separate liability, not retail tax itself.

Work outside prime contracting. A business not required to be licensed by the Registrar of Contractors is excluded from prime contracting, but ADOR states the business may still be taxable under another classification, retail among them.

Selling against installing. A retailer who sells materials and also arranges for their installation into real property is a contractor for that transaction. Selling the same materials without arranging installation keeps it retail. Installation into tangible personal property rather than real property — a vehicle, for instance — stays retail, and installation labor kept separate on the invoice and in the books is a service rendered in addition to the retail sale.

Reported under business code 017.

In full

A Speculative Builder is an owner of real property who improves it — personally or through others — and sells it. The tax is imposed by Arizona cities and towns under Model City Tax Code § 416, not by the state prime contracting classification, and it is measured on the total selling price rather than on a contract amount.

Liability accrues at the close of escrow or the transfer of title, whichever is earlier, and is reported the month following. The selling price includes realtor fees, title transfer fees and the rest of the closing costs built into it.

What counts as improved real property is defined and is broader than a finished building. It reaches property on which a new structure has been substantially completed; land improved without any structure, such as paving or landscaping; reconstructed property; and property where water, power and streets have been constructed to the property line. Once a structure is substantially complete, later improvements do not move the date on which the sale becomes taxable.

A sale is wider than a conveyance. It includes any transfer of title or equitable ownership, and any lease of thirty years or more — the original term and every renewal option counted together — is deemed a sale.

Land is not deductible. Neither the cost nor the fair market value of the land may be excluded, unless the city adopted Local Option #N, which permits the fair market value of land to be excluded and allows twenty percent of the selling price to be used as an estimate of it. All amounts subject to the tax then take a thirty-five percent deduction, and a city tax credit is available for city privilege or use tax already paid on the construction and on materials.

One Speculative Builder may sell partially improved property to another without tax, but only where all three conditions in § 416(b)(4) are met: the purchaser holds a valid municipal privilege tax license as a speculative builder; the purchaser gives the seller a written declaration assuming liability at the time of the transaction; and the seller keeps proper records, retains a copy of that declaration, and is itself properly licensed with the city.

The family residence exception takes a sale outside the tax altogether, and its conditions are strict. Under § 416.1 the property must have been the principal place of family or vacation residence of the seller's immediate family for the six months before the offer for sale; the seller must not have sold more than two such residences in the thirty-six months before the offer for sale; and the seller must not have licensed, leased or rented the premises at any point in the twenty-four months before the offer for sale. All three run from the offer, not the sale. The exception is available only to an individual or a qualified trust — no other entity qualifies, which puts a property held through a company outside it.

In full

This affidavit is the only form in the conversion sequence that a subcontractor issues. It runs upward, from the subcontractor to the contractor who hired them.

It substantiates the retail transaction privilege tax the subcontractor already paid on materials used in a project that started as MRRA and became Modification, where the prime had previously provided a Form 5088 or other documentation.

It exists because the prime cannot claim the credit without it. When a contract converts, the prime immediately provides each subcontractor a completed Form 5005 and requires this affidavit back. The affidavits and the underlying receipts are what the prime uses to complete the MRRA Credit Summary Workbook.

The timing pressure is worth stating. As soon as the contract changes, the prime is required to report the project as modification and the tax liability arises on reporting — the affidavits are being collected while that liability is already running.

A contractor working without subcontractors has no affidavits to collect, and ADOR's published procedure does not address what such a contractor submits instead.

In full

Form 74-4023 is the Taxpayer Bond for Contractors — the document by which a contractor actually posts the bond required under A.R.S. § 42-5006.

It is filed on paper. Because bonding may apply to a new contractor, the TPT license application cannot be completed online in that case: the paper Form JT-1 is submitted together with the bonding paperwork and a copy of the bond attached.

The form is the instrument, not the rule. Who must post a bond, for how long, and in what amount are set by statute and by administrative rule, and are covered at Taxpayer Bond for Contractors rather than here.

Which security a contractor is posting is worth establishing before the form is filled in, because two statutes require different instruments and they do not stack. A.R.S. § 42-5006 takes a surety bond sized to the tax reasonably expected over a hundred and fifty days, with a $2,000 floor and bands set by classification of work; it is maintained for at least two years once required. A.R.S. § 42-5007 requires a bond or other acceptable security in lieu of that one, from a contractor with no Arizona principal place of business, computed on a single contract's gross receipts multiplied by the aggregate tax rates, and only where those receipts reach $50,000.

This form is the § 42-5006 instrument. The § 42-5007 security runs with a named contract and produces a certificate a city needs before it will issue the building permit.

In full

Form 5000 is the Transaction Privilege Tax Exemption Certificate. Its stated purpose is to document and establish a basis for state and city tax deductions or exemptions — not to document a contract. The purchaser completes it and furnishes it to the vendor at the time of the sale, and the vendor retains it. It is not filed with the Department; the form carries no submission instruction.

It is a general certificate, and a contractor is one kind of purchaser using it. Section D lists seventeen exemption reasons, running from leased property and restaurant food to railroad rolling stock and prison food service. Reason 2 is the contracting one: tangible personal property to be incorporated into a taxable contracting project, or a maintenance, repair, replacement or alteration project.

That single box covers both classifications. Checking reason 2 records that the property is going into a construction project; it does not record whether the contract is Modification or MRRA, and the certificate asks nothing further about it. Where the materials end up on an MRRA contract, the retail equivalent is owed later under A.R.S. § 42-5008.01 — nothing on this certificate says so.

Two constraints are easy to miss. Only one category of exemption may be claimed on a certificate, and Section C forces one transaction type per certificate: with a business, with Native Americans, Native American businesses and tribal governments, with a U.S. Government entity, or with a foreign diplomat.

Two exclusions are printed on the first page. Form 5000 is not used to claim a sale for resale — Form 5000A is. And a contractor holding no TPT license does not use Form 5000 at all — Form 5000M is that certificate.

An incomplete certificate is not treated as accepted in good faith. A vendor accepting one in good faith is relieved of the burden of proving the deduction, and the purchaser may then be required to establish that the exemption was accurate.

In full

Form 5000HC is the Transaction Privilege Tax Healthcare Exemption Certificate. It documents a tax-exempt transaction where the purchaser is one of four kinds of qualifying organization: a qualifying hospital, a qualifying health care organization, a qualifying rehabilitation program for mentally or physically disabled persons, or a qualifying community health center.

It is prescribed under A.R.S. § 42-5009 and works like Form 5000 in shape — completed by the purchaser, furnished to the vendor, only one category of exemption per certificate. What differs is what the vendor must hold: the certificate is retained together with a copy of the organization's exemption letter, and the form directs vendors to review that letter carefully.

Two of the four categories carry a use restriction. Where the purchaser is a qualifying health care organization, or an organization running a specialized program for disabled persons, the items purchased must be used solely to provide health and medical related educational and charitable services or for the organization's programs, and the reason must be stated on the certificate.

A contractor working for one of these organizations may be handed both the exemption letter and a Form 5000HC, and that is where the confusion starts. The certificate establishes the organization's status; it is not the document the contractor gives the materials vendor. ADOR's answer for an unlicensed contractor on an MRRA project for a qualified hospital is that a statutory deduction is available for the hospital's materials purchase, so the contractor completes and submits a Form 5000M to the vendor — because the contractor has no TPT license and a vendor could not accept an incomplete Form 5000 in good faith.

So the organization's status creates the deduction, and the contractor's own license status decides which certificate reaches the vendor. Those are two separate questions and the answer to the first does not settle the second. The certificate does not say this; ADOR's Contracting FAQs do.

Section C identifies the facility by name and location; a purchaser claiming the exemption for more than one location attaches a list.

In full

Form 5000M is the Non-TPT Licensed Contractor Certificate (MRRA Project). A contractor that holds no TPT license completes it and furnishes it to the vendor at the time of sale, and the vendor sells without charging tax. The form states that it pertains only to maintenance, repair, replacement or alteration projects.

It exists because a contractor without a license cannot complete Form 5000, and Form 5000's own first page directs that contractor here.

Section E is a check-one list of twelve grounds. Most depend on who the customer is — a qualifying hospital, health care organization, community health center or health sciences educational institution, or one of three 501(c)(3) categories. Two depend on the property: computer data center equipment, and machinery, equipment or a solar device under A.R.S. § 42-5061(B) or (M) affixed to real property. One depends on location and ownership: an MRRA project on an Indian reservation whose owner is the tribe or an affiliated Indian. One depends on neither the customer nor the property but on the two contractors — the general contractor holds a TPT license and has provided a Form 5005 to the unlicensed contractor named on the certificate, with a copy of that 5005 attached. The twelfth is a write-in line for any other statutory authority.

The form's closing instruction frames the whole certificate more narrowly than that list reads: use it only for purchases that are statutorily exempt and where the exemption is available to a non-TPT-licensed contractor on an MRRA project. All other purchases by an MRRA contractor are taxable at the time of purchase.

On a Modification project this certificate has no use. The route for an unlicensed subcontractor there is Form 5009L, which the Department issues rather than the contractor.

In full

Form 5005 is the Contractor's Certificate for Prime Contracting and MRRA. The contractor issuing it assumes the liability; the subcontractors receiving it are the ones protected. It runs downward, from the contractor to the subcontractors, and the direction is the first thing to get right.

It does two things at once. It provides a subcontractor the validation required for exemption from prime contracting tax, and it provides exemption from liability for an amount equal to retail tax on materials incorporated into a maintenance, repair, replacement or alteration project. Which of those it is doing depends on how the project is designated on the form: MRRA or Modification.

Because it establishes liability, the form states that it must be completed by the contractor assuming that liability, and the signature certifies that the contractor is licensed for TPT purposes and is assuming the prime contracting tax liability, the retail-equivalent liability, or both.

It can be issued three ways. As a single project certificate, which requires a project description sufficient to identify the location. Or as a blanket certificate, either for a stated period or until revoked. The blanket form carries a consequence the certificate states plainly: the prime contractor is responsible for every contract during the period, regardless of contract designation. A specific project exclusion box is available to carve individual projects or periods back out.

Completion is not optional. The asterisked fields must be completed or the certificate is not valid, and the form provides that the Department may disregard an incomplete or erroneous certificate under A.R.S. § 42-5008.01 or § 42-5075(E). If it is disregarded, the subcontractor that accepted it carries the burden of proving it is not liable.

The prime provides the certificate to the subcontractors and retains a copy. It is not sent to the Department.

In full

Form 5009L is the Contractor's Project Certificate, and it works unlike every other contracting certificate: the Department of Revenue registers and issues it.

The prime contractor applies, listing every subcontractor on the project who holds no TPT license and attaching the contract pages that identify the parties and the scope of work. The Department registers the certificate. The prime provides a copy to each listed subcontractor, and each subcontractor provides it to a materials vendor. It is not valid unless registered, and incomplete submissions are not registered.

Its statutory footing is A.R.S. § 42-5009(L), and A.R.S. § 42-5061(A)(27)(b) relies on it — that subdivision excludes property sold to a person not subject to tax under § 42-5075 who has been provided a copy of a certificate under § 42-5009(L).

The scope is stated as a taxability test rather than as a classification label. The certificate may only be used for an unlicensed contractor's purchase of materials to be incorporated into the project named on it, "the gross receipts of which are subject to tax under A.R.S. § 42-5075". Gross receipts from an MRRA contract are excluded from that section by subsection (P), so an MRRA project does not meet the test the form states.

The consequence of getting that wrong is printed on the form. Where materials bought under the certificate are later used in the performance of a nontaxable contract, the contractor that gave the certificate to the vendor is liable for an amount equal to the retail transaction privilege tax, with penalty and interest. An exemption claimed on an unauthorized certificate is subject to recapture on the same terms.

That liability is sourced under A.R.S. § 42-5009(L)(3), which directs it to § 42-5040(A)(2) — the purchaser's location in this state, or the purchaser's billing address where there is no delivery address. Form 5009L states instead that the amount is "sourced to the contractor's principal place of business," a phrase that appears nowhere in § 42-5040. The statute governs.

Published sources differ on whether the certificate reaches MRRA work. ADOR's Modification v MRRA chart lists it on the MRRA side as an alternative for an unlicensed subcontractor; the form's own limitation reaches only projects whose gross receipts are taxable under § 42-5075.

In full

Form 5022 is the Speculative Builder Resale Certificate. It documents the sale of partially improved real property from one Speculative Builder to another, and it is the only contracting certificate the purchaser issues to the seller.

The purchaser completes it and furnishes it to the seller at the time of the sale, and the purchaser is the only signatory. By signing, the purchaser assumes liability for and undertakes to pay all taxes that would otherwise be due the City or Town at the time of the sale, declares being licensed with the Arizona Department of Revenue to conduct business as a Speculative Builder, and certifies that the purchase is for resale to another Speculative Builder.

The exclusion the certificate supports comes from Model City Tax Code § 416(b)(4), and that provision imposes three conditions together. The purchaser must hold a valid municipal privilege tax license for construction contracting as a Speculative Builder. The purchaser must provide the seller a properly completed written declaration assuming liability at the time of the transaction. And the seller must also maintain proper records of the transaction, retain a copy of the declaration, and be properly licensed with the City as a Speculative Builder.

Published sources differ on what the certificate records. The code conditions the exclusion on municipal licenses held by both parties; the form declares the purchaser's state license with the Department of Revenue and collects the seller's TPT license number as a field without stating any requirement attached to it. A certificate completed exactly as the form is printed does not on its face document either municipal license the code requires.

The property must be one of four things the form enumerates: a new structure that is partially complete; property improved without a structure, given as paving or landscaping; reconstructed property as provided by Section 416.2; or property that has had water, power or streets constructed to the property line. Those four track the code's definition of improved real property at § 416(a)(2); partially improved means such property being developed for sale where the improvement is not substantially complete at the time of the sale.

Incomplete certificates are not considered to be accepted in good faith. The form advises that seller and purchaser should each retain a copy; under § 416(b)(4)(C) the seller's retention is a condition of the exclusion rather than advice. It is not sent to the Department.

In full

Form 5088 is the Contractor Notice of Tax Responsibility (MRRA). It does two things: it designates a contracting project as MRRA, and it records between the contractor and the subcontractor that the subcontractor is responsible for the tax on the materials it purchases and incorporates. Both parties sign it and both retain a copy.

ADOR describes it as optional but highly recommended. It applies to a single project; additional projects require additional notices.

Its precondition is a forecast. The form states it should be used only where there is a reasonable expectation that the project is maintenance, repair or replacement, or that the alteration is unlikely to exceed the threshold. A notice issued on a project that then converts has a defined exit, printed on the form.

Note Three settles what happens on conversion. Where the project becomes a modification project, the contractor who signed the notice is required to notify the subcontractor by issuing Form 5005, and the notice is automatically revoked. The subcontractor, on receiving the Form 5005, must complete the Affidavit of Retail TPT Equivalent Paid by the Subcontractor and provide it to the contractor who hired them. The 5088 does not survive the conversion, so a contractor is not left holding two certificates that assign the materials tax in opposite directions.

Note Two carries the record-keeping consequence. Where tax was not paid at the time of purchase, the subcontractor retains its materials receipts to calculate what is owed and reports the retail equivalent under business code 315. Where tax was paid at purchase, the receipts substantiate that and nothing further is owed.

In full

Form 10205 is the Bond Exemption Application. A contractor files it to ask the Department to be excused from the bonding requirement.

ADOR's Bond for Contractors page lists it among the bond forms and names it, but does not say which exemption it requests. Two distinct exemptions exist. The annual exemption is not applied for on paper at all — the Department publishes an electronic list of qualified in-state contractors in good standing to each city and issues no paper certificate. The one-time exemption is a per-project certificate the Department may issue to a qualified contractor who is not on that list.

The form itself settles it. It is headed "Transaction Privilege Tax License Application for Bond Exemption" and states its purpose as requesting exemption from the bonding requirement under A.R.S. § 42-5006, for a business applying for a TPT license, against the criteria at A.A.C. R15-5-601.

So it is neither of the two city-facing instruments. The annual exemption is a listing the Department sends each city and is not applied for on paper; the one-time exemption is a per-project certificate the Department may issue to a contractor absent from that list. This form asks to be excused from posting the bond in the first place, at the point of licensing.

In full

Form JT-1 is the Arizona Joint Tax Application. ADOR describes it as the form used to apply for transaction privilege tax, use tax, and Employer Withholding and Unemployment Insurance, and states that the application is called Joint because it is used by both the Arizona Department of Revenue and Economic Security.

That description is not on the form. Nine pages carry no statement of purpose, and the two agencies sharing it are visible only in the form number — JT-1/UC-001. A reader who picks up the application without ADOR's page beside it has no plain statement of what it does.

Its own checkboxes are the closest thing: transaction privilege tax, withholding and unemployment tax where the business hires employees, use tax, and TPT for cities only.

It is returned to the Department with the applicable license fees. Incomplete applications are not processed, and required fields are marked with an asterisk throughout.

Question 12 on page 1 asks directly whether the applicant is a construction contractor, and answering yes routes to the bonding requirement printed beside it. New and out-of-state contractors must post a Taxpayer Bond for Contractors before a TPT license issues, unless the contractor qualifies for exemption. The amount is set by the primary type of contracting performed. A bond may also be required of an applicant delinquent in Arizona taxes or with a history of delinquency.

That is why a new contractor cannot complete the application online. The paper JT-1 is filed together with the bonding paperwork and a copy of the bond.

One threshold appears on the form and is easy to miss. Effective September 14, 2024, a person under the age of nineteen may operate a business without a TPT license where that business does not generate more than $10,000 in gross income in a calendar year.

The form also collects the business description and NAICS code, the type of organization, and whether the applicant acquired or changed the legal form of an existing business.

In full

Form TPT-2 is the Transaction Privilege, Use, and Severance Tax Return. It is the taxpayer's own periodic return, filed with the Department rather than given to any counterparty, and it is due the twentieth day of the month following the month in which the transactions were conducted.

It is not a single page. The return prints a warning that a transaction detail page is required or the return will not process correctly and penalties may apply.

The transaction detail page is where the arithmetic happens, one row per region and business code. Gross receipts, less deductions carried from Schedule A, gives net taxable. Net taxable times the rate gives total tax, less the accounting credit gives the tax due. State and county detail and city detail are computed separately and carried to the front page.

Three checkboxes at the top change what the return is: amended return, final return where the license is being canceled, and a box for a taxpayer with no gross receipts to report, which is still signed and filed.

The signature block carries something worth reading before signing. Alongside the taxpayer's declaration under penalties of perjury and the paid preparer's block, the taxpayer designates an individual as the person to contact to schedule an audit of the return, and that designation authorizes the disclosure of confidential information to that individual.

The form is a calculating PDF and allows only one additional page for each city and state. Beyond that, the Department directs the whole return to be filed online.

In full

Form TPT-EZ is the Transaction Privilege, Use, and Severance Tax Return in its shorter form. It reports the same tax on the same due date as Form TPT-2 — the twentieth day of the month following the month in which the transactions were conducted.

Eligibility is the whole distinction, and it is not printed on the return. The Department states it on the form's page: the TPT-EZ can be used by businesses who operate only one physical location, and a business with more than one location is required to file electronically.

That rule is about locations, not about size, simplicity or tax owed. A one-location contractor working across several jurisdictions is still a one-location business for this purpose; the job sites are not locations of the business.

The return's structure mirrors the TPT-2: net state and county tax and net city tax are computed on the detail pages and carried to the front, with excess tax collected and the excess tax accounting credit reconciled before the amount remitted.

For a contractor the practical point is that filing the shorter return says nothing about how the contract is classified or how the tax was computed. The classification work is identical; only the reporting vehicle is smaller.

In full

The 285 series is three separate instruments. Confusing them is the common error, and only one of them can authorize anyone to act.

Form 285 is the General Disclosure/Representation Authorization Form. Its baseline is disclosure: Section 3 authorizes the Department to release confidential information to a named appointee for stated tax types and periods, and nothing more. Representation arises only where the taxpayer elects it — Section 4 grants specified powers one checkbox at a time, including representing the taxpayer in an administrative tax proceeding and in collection matters, and Section 5 grants a full power of attorney. The appointee must be an individual.

Form 285B is the Disclosure Authorization Form, and it states in bold that it is not a power of attorney and grants no powers of representation. It authorizes appointees to receive information and nothing else. It does not revoke any authorization already on file.

Form 285C is the Disclosure Certification Form. It grants nothing. It certifies to the Department that a person is already authorized under A.R.S. § 42-2003(A) to receive and discuss confidential information, or to execute a power of attorney for another person. Its second certification is for a principal officer of a corporation with authority to bind the taxpayer.

Where Section 4 or Section 5 of Form 285 is used, the appointee signs a declaration under penalty of perjury designating one of five categories: an officer, partner or qualifying employee of the taxpayer; an active member of the State Bar of Arizona; an Arizona CPA; a federally authorized tax practitioner; or other.

That last category carries a ceiling. An appointee who fits none of the first four may be designated only where the total amount in dispute, including tax, penalties and interest, is less than $5,000. If the declaration is not signed and dated, the representation authorization is returned.

For contracting, the series appears in one place in particular: a POA or disclosure authorization is required where anyone other than the taxpayer submits an MRRA Credit Request.

In full

The MRRA Credit Summary Workbook is the vehicle for the reclassification credit. The prime contractor completes it from the subcontractors' affidavits and the underlying receipts, and emails it to the Department.

It goes to ADOR rather than being kept by the parties, which distinguishes it from the contracting certificates — Forms 5000, 5000M, 5005, 5022 and 5088 are all retained by the parties to the transaction.

The submission has specific requirements. Complete one workbook per project per credit request. Follow the instructions tab. Include a POA or Disclosure Authorization Form 285, 285B or 285C where anyone other than the taxpayer is submitting. Put MRRA CREDIT REQUEST in the subject line of the email, which is how the request is routed for assignment.

After submission the Department assigns a credit request number, reviews the workbook for accuracy and confirms the project is now being reported as Modification, may ask for sample invoices, and closes with a Determination Letter.

Whether the workbook is required at all from a contractor with no subcontractors is not addressed in ADOR's published procedure.

In full

Schedule A is not a separate form. It is the deductions detail inside the transaction privilege tax return, headed on the TPT-2 as Schedule A Deductions.

It exists because the transaction detail page carries deductions as a single figure per row. Column (G) of that page reads deductions from Schedule A, and Schedule A is where that figure is broken out.

Each line takes five things: the region code, the business code, the deduction code, the deduction amount, and a description of the deduction code. The lines subtotal and carry forward to the transaction detail.

The consequence for a contractor is that a deduction is not claimable as a lump figure. A deduction has to be attributable to a specific region, a specific business code, and a specific published deduction code — which means the classification question has to be settled before the return is prepared, not after. A deduction claimed under the wrong business code is a mismatch visible on the face of the return.

State and county deductions and city deductions are itemized on separate schedules within the same return.

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The Arizona Department of Revenue. It administers transaction privilege tax, publishes the contracting guidance contractors work from, prescribes the exemption certificates and returns, and collects the tax for the state and the counties.

It also collects city tax, and the arrangement is statutory rather than voluntary. A.R.S. § 42-6001(A) requires the Department to collect and administer any transaction privilege and affiliated excise taxes imposed by any city or town, and requires the Department and each city or town to enter an intergovernmental contract or agreement providing a uniform method of administration, collection and audit.

That is why one return reaches three layers of government, and why the Model City Tax Code's term Tax Collector also means the Department where it is acting as the city's agent.

The Department publishes in several categories that carry different weight — webpages, rulings, procedures, notices, and written answers to individual questions. None of it is statute. Its own TPT Audit page states the order: where anything published is inconsistent with the Arizona Revised Statutes, the Model City Tax Code or the Arizona Administrative Code, those prevail.

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Every ADOR contracting page ends by directing questions to Tax Policy. Submitting in writing and getting an answer in writing is the point: written advice from the Department carries consequences if it turns out to be wrong, and oral advice does not bind the Department at all.

[email protected] handles written policy clarifications; [email protected] handles general assistance. A written answer that is not a formal ruling is an information letter.

Under A.R.S. § 42-2052, no interest or penalty may be assessed on a deficiency directly attributable to erroneous written advice furnished by a Department employee acting in an official capacity in response to a specific request — provided the deficiency did not arise from the taxpayer's failure to supply adequate or accurate information. The same section requires Department employees to state, whenever they give oral advice, that the Department is not bound by it.

ADOR's automated acknowledgment states a response time of 25 business days for Transaction Privilege Tax questions, handled first in first out, and warns that replies arrive by secure email and may be filtered as spam. The acknowledgment is not published on ADOR's site; writing to the address reproduces it.

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The actual law, passed by the legislature. ADOR's webpages explain it, but they are not it. When a guidance page and the statute say different things, the statute controls.

Contracting TPT is governed chiefly by A.R.S. § 42-5075, the prime contracting classification, with the MRRA exclusion, the definitions, and the alteration thresholds inside it. Related sections carry the materials tax and reclassification credit (§ 42-5008.01), retail deductions (§ 42-5061), exemption-certificate substantiation (§ 42-5009), audit authority (§ 42-1108), bonding (§§ 42-5006, 42-5007), and the property tax classes that decide residential versus commercial (§§ 42-12001 through 42-12009).

Citations are read as section, then subsection letter, then paragraph number — § 42-5075(S)(1)(a). Subsection letters move when the legislature amends a section, so an older document may cite a letter that now points elsewhere.

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Where returns are filed and payments made. Two other things live there that matter on a bid. A contractor's TPT license can be checked for active status at the license verification page, and entering a job-site address returns the combined state, county and city rate for that location.

The address and ZIP rate lookup answers the sourcing question directly, since contracting tax is sourced to the job site rather than to the contractor's office.

Rates are not fixed. ADOR's agreement with the municipalities provides a 60-day period between a city's rate change and its implementation, so a rate pulled at bid may differ from the rate at completion. The address is worth checking again before invoicing.

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A city business license is a municipal regulatory license. Some Arizona cities require one, some do not, and each city sets its own requirement, fee and renewal. Questions about it go to the city.

A separate license is easy to confuse with it and is not optional anywhere. A.R.S. § 42-5005(B) requires a person wanting to do business within a city or town that imposes a municipal privilege tax to apply to the Department of Revenue for an annual municipal privilege tax license, with a fee of up to $50 set by the city's own ordinance, submitted with each new application. The statute bars engaging or continuing in business until that license is obtained, and requires the Department to hold the fees in trust for the city.

So the distinction is not state versus city. It is regulatory versus tax. The regulatory license comes from the city and may not exist at all; the municipal privilege tax license is required by state statute, applied for from the Department, and priced by the city.

Both are separate again from a transaction privilege tax license under § 42-5005(A) and from Registrar of Contractors licensure. A contractor working across jurisdictions may need several city licenses, one, or none, while the tax licensing position does not vary that way.

A different matter reaches city offices without being a licensing question at all. The Annual Bond Exemption is the Department's documentation to city building authorities that a contractor has met the bonding requirements of A.R.S. § 42-5007, which a city checks before issuing a building permit.

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A written answer from ADOR that is not a formal ruling is usually called an information letter. It is worth having. Its limit is the part to carry: where the advice proves wrong, A.R.S. § 42-2052(A) bars assessing interest or penalty on a deficiency directly attributable to erroneous written advice furnished in response to a specific request — and the tax itself remains due.

Where the Department declines to issue a ruling, § 42-2101(J) requires it to issue written assistance or advice explaining the refusal and discussing the relevant tax principles.

ADOR's current Letter Rulings page calls the document a taxpayer may request in lieu of a ruling an informal guidance letter. Information letter remains the term used in the Model City Tax Code materials and in practice.

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Arizona cities levy their own privilege tax on top of state and county tax. Rather than each city writing its own code, they work from a shared model. The wording is mostly the same city to city, but cities pick and choose optional provisions, so what is taxable in one city may not be in the next.

The MCTC is adopted by Arizona cities and towns. ADOR maintains the official copy and publishes amendments once the Municipal Tax Code Commission approves them. The Commission also resolves disputes between cities over which one is entitled to a tax. Model Options and Local Options are the variable provisions, published with a chart of which city adopted what.

Two contracting classifications exist only here, with no state or county counterpart: Speculative Builder at § 416 and Owner-Builder at § 417. The deduction for the fair market value of land, reported under deduction code 734, is available only in cities that adopted Local Option #N, which replaces § 416(b)(2) — a concrete case of why the city matters.

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A formal ruling requested in writing, on facts the requester sets out, before the tax has accrued. Where ADOR later revokes or modifies it, A.R.S. § 42-2101(D) bars applying the revocation retroactively to periods before its effective date, and bars the Department from assessing any penalty or tax attributable to erroneous advice in the ruling — on two conditions: that the taxpayer reasonably relied on it, and that the penalty or tax did not result from the taxpayer failing to provide adequate or accurate information, or from a change in that information. That is the meaningful difference from an ordinary written answer.

Requested under A.R.S. § 42-2101 by written application stating the taxpayer's identity, all relevant facts, whether the issue is under audit, protest, or appeal, and whether the same request has gone to another taxing authority. ADOR treats a request as a private taxpayer ruling where the taxpayer's identity is given, and as a taxpayer information ruling where it is not. A taxpayer information ruling binds the Department only if identifying information is supplied before publication.

A ruling may issue only where no tax has accrued on the transactions described. Where it addresses ongoing business activities it applies only to transactions occurring, or liabilities accruing, after the taxpayer receives it. It may not be relied on, cited, or introduced in evidence by any other taxpayer.

ADOR must meet with the requestor within thirty days unless the meeting is waived, provide a draft at least thirty days before issuing, and issue within ninety days absent agreed delay. ADOR's Letter Rulings page states a shorter operational target — forty-five business days after all requested information is received. Rulings are public records, subject to confidentiality limits and a request to withhold publication.

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A different agency from ADOR, with a different license. The ROC license is the one that permits the work. A TPT license is the one that permits reporting the tax. Holding either says nothing about holding the other.

ADOR states plainly that when most contractors claim to be licensed, they are referring to ROC licensure. The distinction has a tax consequence. For periods from and after December 31, 2018, the prime contracting classification does not include any work or operation performed by a person who is not required to be licensed by the Registrar under A.R.S. § 32-1121. A business outside ROC licensing requirements may therefore be outside prime contracting entirely, though it may still be taxable under another classification such as retail.

Which work escapes ROC licensing is set out at A.R.S. § 32-1121(A), and two of its exemptions reach contracting directly.

A materialman, manufacturer or retailer that furnishes finished products without installing them is exempt — and so is one that does install them, where the total value of the sales contract or transaction, including labor, materials and everything else, does not exceed $1,000. The seller must tell the purchaser that a licensed contractor could do the installation instead, and give a name and address on request. A separate carve-out covers certain plug-in electrical fixtures and appliances that are unaltered and connect to a common household outlet.

An owner who improves their own property is exempt where the work is done by the owner, the owner's employees or duly licensed contractors, and the structures are intended for occupancy solely by the owner — not by the public, not by employees or business visitors, and not intended for sale.

Against § 42-5075(A) the consequence is concrete. A retailer who sells and installs flooring for a total of $900 is not required to be ROC-licensed, so that work is outside the prime contracting classification altogether — not MRRA, not Modification — and is taxed under retail instead. The same work at $1,100 is contracting.

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ADOR publishes guidance in several forms, and a tax notice is one of them. For contractors this matters for one reason: the two notices that explained the MRRA and modification split no longer exist. Their contents were folded into ADOR's contracting webpages, and the notices themselves were withdrawn on January 1, 2026.

TPN 15-1 addressed the MRRA rules introduced for periods from January 1, 2015. TPN 18-1 superseded it for periods after December 31, 2018. Both URLs now return a one-paragraph rescission notice stating the contents were incorporated where appropriate into the Department's contracting webpages.

Anything written before 2026 that treats TPN 15-1 as the controlling authority on the MRRA and modification distinction is describing a document that has been withdrawn. The webpages now carry that guidance, and the statute governs over both.

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A.R.S. § 42-5005(A) requires every person receiving gross proceeds of sales or gross income on which transaction privilege tax is imposed, and wanting to engage or continue in business, to apply to the Department for an annual transaction privilege tax license with a $12 fee. The same subsection bars engaging or continuing in business until the license is obtained.

It is applied for on Form JT-1. Online registration is unavailable to a new contractor because a bond may be required, so the paper application is filed with the bonding paperwork.

Modification work requires a license, for the prime and for subcontractors alike. A contractor performing only MRRA work generally does not, and pays tax on materials at the point of purchase instead. A contractor who buys materials exempt and remits the retail equivalent later does need one, because there is no way to report the retail equivalent without it. An out-of-state contractor responsible for completing an Arizona project needs one regardless of where the business is based.

One narrow exception exists. An MRRA-only subcontractor working under a prime on a single one-off Modification project is not required to be licensed, and buys materials for that project against a Form 5009L obtained by the prime from the Department. More than one Modification project ends the exception.

ADOR's Contracting FAQs offer a second route for that case — a Form 5000M presented together with a Form 5005. Form 5000M states on its face that it pertains only to maintenance, repair, replacement or alteration projects, which a Modification project is not. Published sources differ; the form governs, and Form 5009L is the route that survives it.

The license creates a filing obligation rather than a conditional one. A licensed contractor files every period, marking the return as having no gross receipts where nothing was earned. Licenses can be verified at AZTaxes.gov.

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Transaction privilege tax is commonly called Arizona sales tax, and the difference the name hides is the one that matters most to a contractor.

A sales tax is owed by the buyer and collected by the seller. Transaction privilege tax is owed by the business itself, for the privilege of doing business in Arizona. A.R.S. § 42-5008(A) levies privilege taxes "measured by the amount or volume of business transacted by persons on account of their business activities", and (C) designates that levy the transaction privilege tax.

Measured by is not the same as collected from. A contractor may build the cost into the price, though on a prime contracting receipt the statute requires the tax to be stated separately (see Separate line item). A contractor who collects nothing from the customer owes the tax regardless. There is no unpaid buyer to pursue, because the buyer never owed it.

The tax applies to gross proceeds of sales or gross income from a taxable business activity, under separate business classifications that each carry their own tax base and rate. Construction work is either taxed under the prime contracting classification or excluded from it and taxed on materials instead.

State, county and city tax are separate layers reported on a single return.

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Gross receipts is the total amount taken in, before subtracting anything. A.R.S. § 42-5001(7) defines it as the total sale, lease or rental price of the retail sales of retailers, including services that are part of the sale, with no deduction for the cost of property sold, materials used, labor or service performed, interest paid, losses, or any other expense.

Arizona actually uses three terms in this area. Gross income means the gross receipts of a taxpayer derived from trade, business, commerce or sales, and the value proceeding or accruing from the sale of tangible personal property or service, without deduction for losses. Gross proceeds of sales means the value proceeding or accruing from the sale of tangible personal property, again without deduction for cost, expense or losses.

The prime contracting classification does not run on gross receipts. A.R.S. § 42-5075(B) sets the tax base at sixty-five percent of the gross proceeds of sales or gross income derived from the business. ADOR's Contracting FAQ nonetheless describes the gross receipts of a prime contracting project as subject to the tax, using the everyday term rather than the statutory one.

For a contractor the practical point is that none of the three permits netting. Subcontractor payments, material costs and labor are not deducted before the tax base is computed; deductions come only from the list the statute provides.

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On an MRRA contract the contractor pays tax on the materials and does not charge tax to the customer. ADOR directs that the tax paid on those materials be treated as an indirect cost of doing business.

That phrase has a practical meaning for pricing. The tax is a cost of the work, in the same category as fuel, insurance, or equipment wear — recovered through the price quoted, not added to it as a separate charge. A contractor who forgets to price for it absorbs it out of margin.

It also has a bookkeeping consequence. Because the tax is a cost rather than tax collected on behalf of the state, it belongs in job costing with the materials it was paid on. Recording it as a tax payable understates job cost and overstates liabilities.

The treatment is conditional on not billing the tax. ADOR's MRRA Contracting page states that if tax is included as a line item on the invoice, it must be remitted to the Department. Tax shown on the invoice stops being a cost and becomes an amount owed.

ADOR uses two wordings for the same treatment — "indirect cost of doing business" in the Contracting FAQs and "ordinary cost of doing business" on the MRRA Contracting page. They describe the same handling.

This treatment is specific to MRRA work. On a prime contracting contract the tax attaches to the contract amount, and A.R.S. § 42-5075(F) directs that the taxes be separately stated to the purchaser.

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Markup is the amount added to a cost to produce the price charged to the customer. It is a construction cost accounting term rather than a tax term, and Arizona's transaction privilege tax statutes do not define it.

It matters for tax because of where it is reported. On a prime contracting contract the tax base is computed on the gross proceeds of sales or gross income, which is the marked-up price the customer pays, not the contractor's underlying cost. Markup is inside the taxed amount.

On an MRRA contract the position reverses. Tax attaches to the materials the contractor purchases and incorporates, measured on the cost of those materials. Markup added on top of material cost is not part of that measure.

So the same markup is inside the tax base on one classification and outside it on the other, which is one of the reasons the classification question has to be settled before a contract is priced rather than after.

Markup is also distinct from overhead and profit as ADOR uses that phrase on a mixed contract. There, overhead and profit are contract-wide amounts allocated across activity types before the 15% test is applied, and the allocation method is prescribed.

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On a mixed contract, overhead and profit have to be spread across the different kinds of work before the 15% test is run. How they are spread can change the answer for the entire contract.

Overhead and profit are contract-wide and do not attach to a single activity. ADOR's worksheet directs that the percentage for each activity be determined on its represented value including both overhead and profits, and a comment beneath the chart states that overhead and profit may be applied to each bucket based on their percentage.

ADOR Tax Policy confirmed the method on August 25, 2026: allocate pro rata by direct costs. Convert the total costs associated with each activity type into a percentage, and allocate overhead and profit to each on that basis.

Because the 15% test is all-or-nothing, the allocation method can change the classification of a whole contract.

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Whether to show tax as its own line on a customer's invoice has opposite answers depending on how the contract is classified. Same act, different consequence.

On an MRRA contract, ADOR's position is that the contractor should not include tax as a separate line item on the invoice to the customer. The tax paid on materials is treated instead as a cost of doing business, the same way any other input cost is. That follows from where the tax attaches on MRRA work: to the materials the contractor buys, not to what the customer pays.

Listing it anyway has a consequence. ADOR's MRRA Contracting page states that if tax is included as a line item on the invoice, it must be remitted to the Department. A contractor who shows tax on an MRRA invoice as a courtesy, or out of habit carried over from modification work, owes what the line says — on top of the tax already paid on the materials.

On a prime contracting contract, A.R.S. § 42-5075(F) is written as a requirement. Every person engaging in the business of prime contracting shall present to the purchaser a written receipt of the gross income or gross proceeds of sales from that activity, and shall separately state the taxes to be paid.

Published sources differ on that second point. ADOR's Contracting FAQ states that a licensed contractor may, but need not, show tax as a separate line item, because contractors are permitted to factor taxes. ADOR's Tax Factoring page states the same in passing, describing separate charging as an option. The statute says shall; two ADOR pages describe it as optional. The glossary follows the statute and states the divergence rather than resolving it.

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The tax base is the amount the rate is applied to. It is not the contract price and not the profit.

For prime contracting, A.R.S. § 42-5075(B) sets it at sixty-five percent of the gross proceeds of sales or gross income derived from the business. The remaining thirty-five percent is excluded outright, without the contractor having to document anything to obtain it.

The statute then lists amounts deducted from gross before the base is computed. Among them are the sales price of land, which may not exceed fair market value, and a series of specific project and equipment deductions. The order matters: deduct first, then take sixty-five percent of what remains.

Two further exclusions are outside that arithmetic. A.R.S. § 42-5075(L) removes the portion attributable to the actual direct costs of providing architectural or engineering services incorporated in a contract, and § 42-5075(O) removes design phase services and professional services where they are executed before modification begins and separately stated in the contract from construction phase services.

On an MRRA contract there is no prime contracting tax base at all, because the contract is not taxed under this classification. The tax attaches to the materials instead.

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Tax factoring means extracting the tax from receipts when the tax was not separately identified to the purchaser. ADOR describes it as a mathematical process used when the seller wishes to charge the purchaser a flat amount.

This is not what factoring means anywhere else in business. In finance, factoring is selling receivables to a third party at a discount to get paid sooner. In Arizona transaction privilege tax it has no connection to receivables, financing, or discounts. A contractor who knows the finance meaning is not merely unfamiliar with this one, but actively misled by it.

The situation it addresses: a prime contractor quotes one flat price to the customer rather than showing the contract amount and the tax as two figures. The tax is inside that price and still has to be reported. Factoring is the arithmetic that separates them after the fact.

ADOR states that any prime contractor may opt to factor transaction privilege tax and county excise tax, and that while the prime contractor has the option of separately charging the tax, it is often more convenient to charge a flat price and factor later.

Factoring is a reporting method, not a way to reduce what is owed. The same tax is due whichever way the price is presented to the customer.

One thing the guidance does not say underlies the option. A.R.S. § 42-5075(F) provides that a prime contractor "shall present to the purchaser … a written receipt … and shall separately state the taxes to be paid pursuant to this section." ADOR's Contracting FAQs and Tax Factoring page both describe separate statement as optional. Published sources differ; see separate line item, which carries the divergence in full.

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Thirty-five percent of a prime contracting contract is not taxed. A.R.S. § 42-5075(B) states this from the other direction: the tax base for the prime contracting classification is sixty-five percent of the gross proceeds of sales or gross income derived from the business.

The two statements describe the same arithmetic, and contractors encounter both. Searching for a thirty-five percent deduction in the statute finds nothing, because the statute never uses that figure.

It is automatic. Unlike the itemized deductions at § 42-5075(B), the reduction requires no certificate, no letter of qualification, and no documentation of what it represents. It is understood to stand in for the labor component of a construction contract, but the statute attaches no such condition and does not require the contractor to show any labor at all.

It applies only under the prime contracting classification. MRRA work is outside that classification entirely, so there is nothing for the reduction to apply to — a contractor who applies sixty-five percent to an MRRA materials cost has used the wrong rule.

Sequence matters when both apply. The itemized deductions come out of gross first, and the sixty-five percent is taken on what remains.

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The factor is the number used to perform tax factoring. Multiplying a tax-inclusive flat price by the factor for the project's location produces the tax to report.

It is not a single statewide number. It is built from the combined state, county and municipal rate that applies at the job-site location, so two identical contracts in two jurisdictions use different factors.

For prime contracting it is also not built on the full contract price. The tax base for the prime contracting classification is sixty-five percent of the gross proceeds of sales or gross income, so the factor for a prime contracting project reflects a rate applied to that reduced base rather than to the gross. A factor taken from a retail table and applied to a contracting receipt produces the wrong number.

Candor does not publish factors or rates. Rates change, and ADOR's agreement with the municipalities provides a period between a city adopting a rate change and its implementation, so any figure published here would go stale silently. The address lookup at AZTaxes.gov establishes the rate for a specific job site.

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The Annual Bond Exemption is not an exemption from tax and, despite the name, is not something most contractors apply for. It is the Department's documentation to city building authorities that a contractor has satisfied the bonding requirements of A.R.S. § 42-5007, or is exempt from them.

It is delivered as a list, not a certificate. The Department no longer issues paper Annual Bond Exemption Certificates to in-state contractors in good standing; it provides each city an electronic listing of qualified exempt contractors, and the city checks that list when a permit is sought.

The timing is fixed and unforgiving. The exemption expires on 31 July, and the new list reaches the cities on 1 August.

The consequence of not appearing on it is a permitting problem before it is a tax problem. Where a contractor is not on the list, the city will not issue a building permit without certification from the Department that the bonding requirement has been met or that the contractor is exempt for the project.

The Department states that it may issue an exemption to qualified contractors based on timely reporting and length of time in Arizona.

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Economic nexus makes an out-of-state business taxable on the strength of how much it sells into Arizona, without any physical presence. A.R.S. § 42-5044 sets the test: a remote seller exceeding $100,000 in gross proceeds from Arizona customers in the previous or current calendar year, or a marketplace facilitator exceeding the same figure.

The reason it appears in a contracting glossary is to be ruled out. Section 42-5044 is scoped to a person conducting business "in an activity classified under section 42-5061" — the retail classification. Prime contracting is classified under § 42-5075. Contracting income is not within the section, and no dollar threshold makes an out-of-state contractor taxable or excuses one.

An out-of-state contractor is taxable because the work is performed on Arizona real property, which is physical nexus, and that applies to a single project of any size.

Where it can matter to a contractor is on the materials side rather than the contract side. A contractor also making retail sales into Arizona is doing something § 42-5061 classifies, and the thresholds are computed with all affiliated persons aggregated — a person holding more than five percent, directly or indirectly, in another.

Crossing the threshold partway through a year does not create immediate liability. The license is obtained once the threshold is met, and remittance begins on the first day of the month starting at least thirty days afterwards.

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The one-time bond exemption is a certificate the Department may issue for an individual project, to a qualified contractor who does not appear on the annual exemption list.

It exists to solve a specific problem. A city building authority will not issue a permit to a contractor absent from the list without certification from the Department, so a contractor who is otherwise in good standing but not listed has no route to a permit without one.

It is discretionary and per project. The Department states that it may issue such a certificate; nothing in the published guidance describes an entitlement, and it covers the individual project rather than the contractor generally.

It is distinct from the annual exemption, which is a standing listing renewed each August, and from the exemption from the bonding requirement itself, which is applied for on Form 10205 when a contractor applies for a TPT license. All three are commonly called a bond exemption and none of them is the same instrument.

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Physical nexus is the ordinary basis on which Arizona taxes a business: the activity happens in Arizona.

For contracting it is close to automatic and rarely in doubt. The work is performed on real property located in Arizona, so the income is Arizona income. An out-of-state contractor who takes a single Arizona project is taxable on it, must hold a TPT license, and is within the bonding requirement because the principal place of business is elsewhere.

That is a different question from where the income is reported. Nexus decides whether Arizona taxes the contractor at all; sourcing decides which jurisdiction within Arizona the amount belongs to. A contractor can have unquestionable nexus and still get the reporting wrong.

An out-of-state contractor should not expect a threshold to shield a small Arizona project. The sales thresholds that excuse small out-of-state sellers belong to a different section and a different classification.

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Principal place of business decides whether a contractor is treated as based in Arizona, and the consequence is bonding: A.R.S. § 42-5006(A) requires a bond where the taxpayer's principal place of business is outside this state.

It is not a mailing address and not where the owner lives. A.R.S. § 42-5007(F) defines it as "a location where a person has continuously operated a facility with at least one full-time employee for the preceding twelve consecutive months."

That definition opens with the words "In this section." It is written for § 42-5007 and the security that section requires. A.R.S. § 42-5006(A) uses the same phrase for the bonding question and defines it nowhere. ADOR applies the § 42-5007(F) test to both, which is a reasonable reading and is not one the statute states.

Both halves matter. A contractor with an Arizona address but no facility does not meet it, and a contractor with a facility staffed only by the owner as a sole proprietor, or only by subcontracted labor, has an employee question to answer before relying on it.

The phrase also turns up in sourcing, in two places where something has gone wrong — and in one of them it is the form talking rather than the statute. Where materials bought under a Form 5009L are used on a nontaxable contract, Form 5009L says the liability is sourced to the contractor's principal place of business; A.R.S. § 42-5009(L)(3) sources it under § 42-5040(A)(2), which reaches the purchaser's location. Where a contractor cancels a TPT license while holding exempt materials, ADOR reports the retail equivalent at the rate of the contractor's principal place of business.

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A taxpayer bond secures payment of transaction privilege tax to the state and its political subdivisions. It is not a performance bond and has nothing to do with completing the work.

A.R.S. § 42-5006(A) requires the Department to take a surety bond from a taxpayer who must be licensed with the Registrar of Contractors, or who is regulated as a manufactured housing dealer, where the taxpayer's principal place of business is outside Arizona or the taxpayer has conducted business in Arizona for less than one year. Once required, the bond is maintained for at least two years.

The amount is not a percentage of anything a contractor does. Section 42-5006(B) sets a floor of $2,000 and sizes the bond to the tax reasonably expected over a hundred and fifty days; the Director may establish classes in five-thousand-dollar increments above that floor, and the published bands are set by classification of work.

A.R.S. § 42-5007 provides a different security, and it is an alternative rather than an addition. It applies in lieu of the bond required under § 42-1102 or § 42-5006, to a person in the construction business who does not have a principal place of business in Arizona and who enters a prime construction contract to be performed here. The security is furnished at the time the contract is entered into, and the contractor obtains a certificate from the Director that the section has been met.

The amount is computed on the contract: gross receipts to be paid under the contract, multiplied by the aggregate rates of the applicable taxes imposed by chapter 5. No land deduction and no thirty-five percent reduction enter that computation — those belong to the tax base under § 42-5075(B), not to the security.

Three consequences follow. Where the total to be paid changes by ten percent or more after the security is furnished, the contractor increases or decreases it within fourteen days. The section does not apply at all where total gross receipts under the contract, including any change, are to be less than fifty thousand dollars. And a city, town, county or state agency shall not issue a building or other construction permit to a person subject to the section without first being furnished the Director's certificate, which is what makes this a permitting question before it is a tax one.

Non-compliance is enforced rather than penalised: the Director may demand compliance by certified mail and, on failure within ten days, seek an injunction against the business under § 42-1103.

Published sources differ on who must post the first bond. ADOR's Bond for Contractors page states the statutory conditions; Publication 539 states that contractors required to be licensed with the Registrar of Contractors must post a bond unless exempt, without the conditions § 42-5006(A) attaches.

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An exempt purchase is a materials purchase where the contractor gives the vendor a certificate instead of paying tax at the register. The tax does not disappear — on MRRA work it comes back later as the retail equivalent.

A TPT-licensed contractor uses Form 5000. ADOR states that all licensed contractors may claim exemption on the purchase of materials to be incorporated into real property by providing the vendor with that form.

The statute behind it is narrower than that description. A.R.S. § 42-5061(A)(27)(a) excludes tangible personal property sold to a person subject to tax under the prime contracting classification, or to a subcontractor working under the control of such a person, where the property is incorporated or fabricated into real property, or into a project described in § 42-5075(P), or used in environmental remediation. The test is who the buyer is and what becomes of the property, not what the certificate says.

A contractor without a TPT license cannot use Form 5000, because a vendor cannot accept an incomplete certificate in good faith. Two narrower routes exist. Form 5000M covers limited circumstances where a statutory deduction already exists for the materials and they will be used on an MRRA project. On a modification project, the prime contractor may obtain an approved Form 5009L from the Department and provide it to the unlicensed subcontractor — a route with its own statutory footing at § 42-5061(A)(27)(b), which reaches a person not subject to tax under § 42-5075 who has been provided a certificate under § 42-5009(L).

ADOR recommends buying exempt for contractors who perform both kinds of work, on the ground that they will likely find it beneficial to purchase all materials tax exempt and remit the retail equivalent on the MRRA portion.

The reason that recommendation holds up is the direction of the error. An exempt purchase that turns out to be MRRA is ordinary treatment — remit the retail equivalent. A taxed purchase that turns out to be Modification requires the credit process, which runs on a six-month expectation and a workbook. One path has a routine correction and the other has a procedure.

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Materials incorporated into real property are materials that become part of the property itself once installed — the concrete, lumber, wiring and roofing that stop being separate items and become the building.

The phrase carries more weight than it looks like it does. A.R.S. § 42-5061(A)(27) excludes it from the retail classification, which is what lets a contractor buy without paying tax at the register, and A.R.S. § 42-5159(A)(13)(g) excludes the same property from use tax in matching terms. A.R.S. § 42-5008.01(A) then makes the contractor liable for an amount equal to that tax where the same property is incorporated or fabricated into a project described in § 42-5075(P).

The statutory wording is worth reading rather than paraphrasing. ADOR labels § 42-5061(A)(27) as materials incorporated into real property and sold to a contractor, but the statute sets two conditions: the buyer is a person subject to tax under the prime contracting classification or a subcontractor under such a person's control, and the property is incorporated or fabricated into real property, into a § 42-5075(P) project, or used in environmental remediation. "Sold to a contractor" is a shorthand for the first condition, not the condition itself.

So the same phrase opens the exemption at purchase and triggers the liability at use. Both halves depend on the materials being incorporated rather than merely supplied.

It is distinct from tangible personal property installed in existing property, which keeps its own identity after installation and can be removed in essentially the same form. Machinery bolted to a floor is installed; the concrete of the floor is incorporated. The distinction does not limit what can be replaced: the statute's replacement reaches a component or a system as well as tangible personal property installed in existing property.

What the phrase does not do is determine classification. Materials are incorporated on Modification contracts and MRRA contracts alike; what changes is whether the tax attaches to those materials or to the contract amount.

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Retail equivalent is not retail tax. It is an amount equal to the tax a seller would have been required to pay, owed by the contractor rather than collected from a customer. Nothing in the phrase says that, which is why contractors mistake it for tax they are charging someone.

It arises on MRRA work. A licensed contractor gives a materials vendor a Form 5000 and buys materials tax free. When those materials are used on an MRRA project, the contractor remits the retail equivalent instead.

The mechanics are specific and none of them follows from the name. The gross cost of the materials is reported — markup is not included. Business code 315 carries it. The rate is sourced to the job site rather than to the contractor's own place of business. It is reported in the tax period in which the materials are used, not the period in which they were bought.

The statutory basis is A.R.S. § 42-5008.01(A), which makes a prime contractor, or a subcontractor working under that prime's control, liable for an amount equal to any tax a seller would have been required to pay, where property bought under the contractor exclusion is incorporated into a project described in § 42-5075(P).

The alternative is to pay retail tax to the vendor at the point of purchase. A contractor performing only MRRA work is not required to hold a TPT license, and an unlicensed contractor has no second option — paying at the register is the only route available.

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A statutory deduction is an amount a statute allows to be subtracted before the tax is computed. It is not a discretionary allowance and not a business expense — it exists only where a statute names it.

Two separate sets matter to a contractor, and they are easy to conflate.

On a prime contracting contract, A.R.S. § 42-5075(B) lists amounts deducted from gross proceeds of sales or gross income before the tax base is computed. The list is specific: the sales price of land, capped at fair market value; contracts in a military reuse zone; qualified environmental technology facilities; certain remediation work; machinery and equipment with independent functional utility; development fees; and others. Several require a letter of qualification obtained before work begins, which cannot be applied for afterward.

On MRRA work there is no prime contracting base to deduct from. Instead, the retail deductions at A.R.S. § 42-5061(B) carry into the retail-equivalent computation. That subsection deducts named categories of tangible personal property from the retail tax base in addition to the exclusions in subsection A — ADOR gives exempt machinery and equipment as an example — so materials otherwise subject to the equivalent may be deductible on the same grounds a retail sale would be.

The deduction codes used to report these on a return are a separate matter from the deductions themselves, and are set out on their own entry.

A deduction is not the same as the 35% reduction. The reduction is automatic and requires no documentation; a deduction must be identified, supported, and in several cases pre-qualified.

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Use tax is an excise tax on the storage, use or consumption of tangible personal property in Arizona, imposed as a percentage of the sales price under A.R.S. § 42-5155(A). Its purpose is to reach property that was bought without Arizona transaction privilege tax being paid on it.

The rate matches the retail rate for the same type of transaction, so the choice of where to buy does not change what is ultimately owed. Every person storing, using or consuming such property in Arizona is liable, and A.R.S. § 42-5155(F) provides that the liability is not extinguished until the tax is paid to the state. A receipt from a retailer that maintains a place of business in Arizona, or that the Department has authorized to collect, relieves the purchaser of further liability.

It also reaches property bought for resale and then used instead of resold.

For a contractor, the point of contact is materials bought outside Arizona, and the answer depends on which of two taxes applies.

Where use tax is the tax, another state's tax counts. A.R.S. § 42-5159(A)(2) exempts property whose sale or use has already been subjected to an excise tax at a rate equal to or exceeding Arizona's under the laws of another state, and where the other state's rate is lower, the Arizona tax is reduced by the amount already imposed. A contractor who paid another state's sales tax is not taxed twice on the same materials.

Where the retail equivalent is the tax, it does not. A.R.S. § 42-5008.01 imposes an amount equal to retail tax on materials bought under the contractor exclusion and incorporated into an MRRA project, and no provision reduces that amount by tax paid elsewhere. A licensed contractor who bought exempt out of state owes the full amount.

Which tax applies follows from who the contractor is. The exclusion at § 42-5159(A)(13)(g) reaches a person subject to tax under § 42-5075, or a subcontractor under such a person's control — and § 42-5008.01(A) imposes the retail equivalent on that same population. An MRRA-only contractor working directly for a property owner is neither. That contractor cannot buy exempt, never reaches § 42-5008.01, and is within use tax under § 42-5155(F) with the § 42-5159(A)(2) credit available.

ADOR's Contracting FAQs answer the question "does Arizona provide any credits for this purchase?" on an MRRA project with "No. There is no credit for materials purchased out of state for taxes paid to another state," and elsewhere that "there is no statutory allowance for it." That holds for the retail equivalent. It does not hold for the contractor who owes use tax, and § 42-5159(A)(2) is the allowance. Published sources differ; the statute governs.

The contractor exclusion has a use tax counterpart. A.R.S. § 42-5159(A)(13)(g) exempts tangible personal property purchased by a person subject to tax under the prime contracting classification, or by a subcontractor under such a person's control, where the property is incorporated or fabricated into a structure in fulfillment of a contract or into a § 42-5075(P) project — the same test § 42-5061(A)(27) applies on the retail side, so buying out of state does not open a gap.

Use tax is not the retail equivalent, though both arrive at a similar figure by a different route. The retail equivalent is owed under A.R.S. § 42-5008.01 because materials bought under the contractor exclusion were incorporated into an MRRA project. Use tax is owed under § 42-5155 because property is used or consumed in Arizona without transaction privilege tax having been paid. A contractor can meet one and still owe under the other.

One contracting-specific rule appears in the use tax statute itself: a manufactured building purchased outside Arizona and set up in Arizona is taxed on sixty-five percent of the sales price, mirroring the prime contracting base.

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On a mixed contract the charges are itemized by activity and the resulting percentages drive the outcome. The Evaluating Mixed Construction Contracts worksheet reserves the Department's right to reallocate those itemized charges where the contractual description or the itemized charges are not consistent with the chart.

This is a power ADOR holds, not a remedy available to the taxpayer. A contractor who allocated badly and wants the numbers re-sorted has no corresponding right and amends returns instead.

What it means in practice is that itemization protects the analysis only insofar as the itemization matches the work. Labeling a charge as replacement does not make it replacement. The worksheet says as much at the front, conditioning the whole analysis on amounts for each activity being separately identified and on the construction activity being accurately described in the contract or attached documents.

Two defaults nearby run the same direction. Where a contract on existing property carries a single lump sum and contains any alteration activity, the worksheet allocates the whole amount to alteration. And project elements may not be artificially separated from a contract to make a project qualify as an alteration — though on that one the burden of proof is the Department's.

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Each contract is independent of any other contract, so genuinely separate contracts are separately classified. The statute sets one limit on that independence, and the limit is narrow.

Project elements may not be artificially separated from a contract to cause a project to qualify as an alteration. That is the entire prohibition.

The next sentence is the one worth knowing at a bid. The department has the burden of proof that project elements have been artificially separated from a contract. A contractor does not have to prove that a separation was genuine; ADOR has to prove that it was not.

The scope is narrow in both directions. The rule reaches separation aimed at qualifying a project as an alteration, which is the case where splitting pays — alteration is the only MRRA activity with a threshold. It says nothing about separation aimed at anything else, and outside the alteration context the statute states no anti-splitting rule at all. Silence is not permission; it means the question would be argued on other grounds.

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Bucket is ADOR's own word, used in quotation marks at section 2a of the Evaluating Mixed Construction Contracts worksheet. It is not Candor's coinage.

Sorting a mixed contract means assigning each itemized charge to the activity type it belongs to — maintenance, repair, replacement, alteration, modification — so that modification charges can be totaled separately from MRRA charges. The worksheet's chart carries those five columns and a total that must reach 100%.

Two assignment rules are not discretionary. Alteration work that has passed the applicable threshold joins the modification bucket rather than staying with the MRRA work. And demolition follows its parent activity: alteration demolition into the alteration bucket, replacement demolition into the replacement bucket, because demolition and site preparation are considered part of the main project.

Overhead and profit are allocated across the buckets pro rata by direct costs — the worksheet permits allocation by each bucket's percentage, and ADOR Tax Policy confirmed the pro rata method in writing on August 25, 2026.

The totals produced by sorting are what the 15% test compares. Sorting cannot be performed at all unless the itemized charges can properly be allocated to each activity type, which the worksheet states as a condition on the exercise.

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Combined modification charges is the total of every charge in a contract that belongs to the modification bucket, added together before the 15% test is applied.

It includes alteration charges that are over the applicable threshold, since over-threshold alteration joins the modification bucket rather than staying with the MRRA work. On a contract that mixes alteration with maintenance, repair or replacement, the alteration charges alone are compared with the threshold, as ADOR Tax Policy stated in writing on September 30, 2026.

The figure is not a sum of bare direct costs. Overhead and profit are allocated into each bucket before the buckets are summed, pro rata by direct costs — ADOR Tax Policy confirmed that method in writing on August 25, 2026. Summing direct costs alone produces a smaller numerator, a different percentage, and potentially a different classification of the whole contract.

This total is divided by the total contract amount to produce the percentage the 15% test evaluates. At 15% or less the entire contract is MRRA; above 15% it is prime contracting.

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De minimis is a legal term meaning too small to matter. Here it names the 15% test, which decides whether modification activity inside an MRRA contract changes the treatment of the whole contract.

The combined modification charges are divided by the total contract amount. At 15% or less, the modification activity is disregarded and the entire contract is MRRA. Above 15%, the entire contract is prime contracting.

The rule is all-or-nothing in both directions. Above the line it is not only the modification portion that becomes taxable; the whole contract does.

Overhead and profit are allocated across the activity types pro rata by direct costs before the comparison is made.

A contract at exactly 15% is MRRA. The statute excludes "a de minimis amount of modification activity" and gives no percentage; the 15% figure is ADOR's. Its Contracting FAQs state 15% or less, and its worksheet describes modification activity of less than 15% as de minimis. ADOR Tax Policy stated in writing on September 30, 2026 that de minimis includes exactly 15%, and that the worksheet's wording does not exclude it.

The test is not run only once. A change order that directly relates to the scope of the original contract is folded into that contract, and the percentage is computed again on the combined total. Where the result moves the contract across 15%, in either direction, the new classification applies from the start of the contract. ADOR Tax Policy stated this in the same letter.

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The mixed-contract analysis may be used only where the amount charged for each activity type is separately identified and the activity accurately described.

Back-end records behind a lump-sum bid are accepted in place of itemization on the contract itself. What cannot be supplied later is accuracy: labeling a charge as replacement does not make it replacement, and the Department reserves the right to reallocate itemized charges that are not consistent with the contractual description.

One assignment rule is fixed rather than left to the itemizer. Demolition, wreckage and site preparation costs are considered part of the main project, so they follow whatever the surrounding work is rather than standing on their own. ADOR's own examples: alteration demolition goes into the alteration bucket, replacement demolition into the replacement bucket. Where the project is MRRA, demolition that is a necessary part of it is MRRA too.

That rule runs the same direction as the statute. A.R.S. § 42-5075(S)(6)(b) excludes from Modification any wreckage or demolition that is a necessary component of an MRRA project.

This is a precondition rather than a step. Where itemization is not met in any form, the worksheet does not apply and the question of proportions never arises — the lump-sum default takes over instead.

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A lump-sum contract states a single price for the whole of the work, without separating the charge for each activity.

A lump sum is not itself a problem. ADOR accepts back-end records behind a lump-sum bid in place of itemization on the contract, provided each activity is accurately described. The itemization has to exist somewhere; it does not have to be in the document the customer signed.

Where no breakdown exists in any form, the worksheet does not resort to judgment. It applies a default, and the default is severe: on a contract relating to existing property that contains only one lump sum amount, all of it is allocated as alteration activity if any alteration activity is included in the contract.

The effect is worth working through. A contract containing mostly repair, with one alteration item in it, priced as a single figure, is treated as though the entire price were alteration. The whole amount is then compared to the alteration threshold — 25% of full cash value on residential property, or $750,000 elsewhere. A contract that would have passed comfortably on its actual alteration content can breach the threshold on its total, and once it does, the over-threshold alteration joins the modification bucket and the contract is taxable under prime contracting in full.

So the cost of not itemizing is not a loss of precision. It is a specific adverse allocation, applied to the largest number in the contract.

One case is unaffected. Where the contract contains neither alteration nor modification, the worksheet treats the project as MRRA and states that no further analysis is necessary.

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An amended return corrects a period already filed. There is no separate amendment form — the TPT-2 carries a checkbox at the top marking the return as amended, and the corrected return replaces the original for that period.

Contracting produces two recurring reasons to amend. A contract that converts from MRRA to Modification changes what should have been reported and under which business code, and a contractor who buys materials exempt against a threshold that later moves may have reported a retail equivalent that no longer belongs.

Where the correction is a reclassification, amending the return is not the same thing as recovering the tax. The credit for materials tax already paid runs through the MRRA Credit Request, which is a separate submission with its own six-month expectation.

ADOR states that where a taxpayer determines they have filed incorrectly they should file amended returns, and that penalty abatement may be requested and is granted under the rules in place for abatement.

One trap is in the deduction codes. A deduction code that has been retired is disallowed on an amended return for periods after its expiry, and it may be disallowed even where the amendment is being filed for an unrelated reason.

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A business code identifies the classification income is reported under on the transaction privilege tax return. It is entered on the transaction detail page alongside the region code, and it determines the rate applied and the deductions available.

For contracting the codes are few and the distinctions between them are the whole subject. Prime contracting income is reported under 015. The retail equivalent on materials used in an MRRA project is reported under 315 — a separate code, not a variant of 015. Speculative Builder and Owner-Builder are city classifications with their own codes, and there is no state equivalent for either.

One consequence catches contractors out. All contracting revenue, including MRRA revenue, is reported under 015 as gross income; the MRRA portion is then removed by deduction code 500. MRRA income is not simply left off the return.

Code 315 is reported on the gross cost of the materials, with no markup, at the job-site rate, in the period the materials are used.

Codes are entered per region. A contractor working three jurisdictions files three rows, and a deduction claimed under the wrong code is a mismatch visible on the face of the return.

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A deduction code identifies which statutory or Model City Tax Code deduction an amount is being claimed under. It is entered on Schedule A of the return together with the region code, the business code and the amount, and it is what makes a deduction claimable at all — a figure subtracted without a code has no basis on the face of the return.

Codes are not universally available. Each one lists the state and city business codes it applies to, and some apply only to certain cities. Deduction 690 for design phase and professional services is available at state level and not to cities; deduction 734 for the fair market value of land is available only in the cities that adopted Local Option #N, which ADOR's listing enumerates by name.

One pattern is worth learning because it explains something the guidance asserts without explaining. The prime contracting codes in the 600s are cost-basis mirrors of the retail codes in the 500s — 622 is the cost of the 522 deduction in gross income, 691 the cost of 591, and so on. That is the machinery behind retail deductions carrying into the retail equivalent computation: the contractor claims, at cost, what a retailer would have deducted at sale.

Deduction 500 carries a condition its short name hides. It is not simply an MRRA deduction — it reaches a maintenance, repair, replacement or alteration contract with the property owner, which is the same limitation A.R.S. § 42-5075(P) places on the exclusion itself.

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A transaction privilege tax return is due on the twentieth day of the month following the period in which the tax accrued. The period itself depends on how much the business expects to owe.

A.R.S. § 42-5014 sets three frequencies. Monthly is the default. A taxpayer whose estimated annual liability is between $2,000 and $8,000 is authorized to pay quarterly. A taxpayer whose estimated annual liability is under $2,000 is authorized to pay annually, with the return due on the twentieth of January following.

The due date and the delinquency date are different dates, and the gap depends on how the return is filed. For a taxpayer required or electing to file and pay electronically, the return is delinquent if not received by the last business day of the month. For everyone else it is delinquent if not received by the business day preceding the last business day.

Filing frequency does not follow classification. A contractor doing only MRRA work still files on whatever frequency the liability supports, and a licensed contractor files every period even where nothing is owed.

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The job-site rate is the combined state, county and city rate that applies at the location where the work is performed. It is the rate a contractor computes tax at, and it changes from project to project.

It applies on both sides of the classification. Prime contracting income is sourced to the location of the project. The retail equivalent on materials used in an MRRA project is reported at the job-site rate, in the period the materials are used.

The consequence is that a contractor's own address is not the reference point. Two identical contracts, priced identically, produce different tax in different towns, and a contractor who quotes from a single remembered rate will be wrong on one of them.

One liability is sourced differently and is worth knowing as the exception. Where materials bought under a Form 5009L are used on a nontaxable contract, A.R.S. § 42-5009(L)(3) sources the amount under § 42-5040(A)(2), which reaches the purchaser's location rather than the job site. The form itself says the contractor's principal place of business; the statute does not.

Candor does not publish rates. Rates change, and ADOR's agreement with the municipalities provides a period between a city adopting a change and its implementation, so any figure published here would go stale silently. The address lookup at AZTaxes.gov establishes the rate for a specific job site.

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Arizona collects transaction privilege tax for the state, the counties and the cities on one return, so every line has to say which jurisdiction it belongs to. That is what location-based reporting means.

Two different numbers do two different things, and the names are close enough to cause trouble.

A location code identifies a registered business location. ADOR assigns one to each location on a TPT license, and it appears on the license certificate as a three-digit number below the address.

A region code identifies the taxing jurisdiction an amount is reported to. It is what the transaction detail page and Schedule A actually take.

For most businesses the two line up, because income arises where the business is located. For a contractor they routinely do not. Prime contracting income is reported to the location of the project, and the retail equivalent on MRRA materials is reported to the job site. A contractor with one office working in six jurisdictions files six region rows and never reports to the office at all.

ADOR's own page on the subject addresses location codes for business locations and does not discuss contracting.

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Holding a transaction privilege tax license creates a filing obligation, not a filing obligation conditional on income. A licensed contractor files every period, and a period with no activity is filed as a period with no activity.

The TPT-2 provides for it directly: a box at the top of the return, checked and signed, stating the taxpayer has no gross receipts to report.

The case arises constantly in contracting. Work is seasonal, projects run long, and a contractor can go months between the completion of one contract and the first receipt on the next. None of that suspends the obligation.

An MRRA-only contractor who holds no license has no reporting obligation at all — but a contractor who took a license in order to buy materials exempt and remit the retail equivalent has one, and it does not lapse in the periods when no materials are used.

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Sourcing decides which jurisdiction an amount is reported to and therefore which combined rate applies.

The general rule in contracting is that it follows the work. Gross receipts from a modification project are sourced to the location the project takes place, and the retail equivalent on materials used in an MRRA project is reported to the location of the project.

Two cases are sourced away from the project, and both arise from something going wrong. Where materials bought against a Form 5009L are used on a nontaxable contract, A.R.S. § 42-5009(L)(3) sources the liability under § 42-5040(A)(2) — the purchaser's location, with the billing address as the fallback where there is no delivery address. Form 5009L states the contractor's principal place of business instead, which is not what § 42-5040 says. Where a contractor cancels a TPT license while holding materials bought exempt, ADOR reports the retail equivalent at the rate of the contractor's principal place of business.

Speculative builder tax is sourced differently again, because it is not sourced to a project at all — it is a city tax on the sale of improved real property within that city's boundaries.

Manufactured buildings have their own situs rules: where the dealer contracts to deliver to a setup site in Arizona or performs the setup, the situs is the setup site; where not, it is the dealership location; and where delivery is to a setup site outside Arizona, the transaction is excluded.

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Two Arizona statutes define contractor, and they are not the same definition.

For tax, A.R.S. § 42-5075(S)(3) states that contractor is synonymous with builder and means any person or organization that undertakes to or offers to undertake to, or purports to have the capacity to undertake to, or submits a bid to, or does personally or by or through others, modify any building, highway, road, railroad, excavation, manufactured building or other structure, project, development or improvement, or to do any part of such a project, "including the erection of scaffolding or other structure or works in connection with such a project." It includes subcontractors and specialty contractors. The last sentence is the one that surprises people: for all purposes of taxation or deduction, the definition governs without regard to whether the contractor is acting in fulfillment of a contract.

For licensing, A.R.S. § 32-1101(A)(3) defines contractor around compensation and around a wider list of verbs — construct, alter, repair, add to, subtract from, improve, move, wreck or demolish — reaching anyone who does that work by or through others, or who directly or indirectly supervises others doing it, and reaching connection of a structure to utility service lines, metering devices or the sewer line and the provision of mechanical or structural service to it. It expressly includes subcontractors, specialty contractors, floor covering contractors, hardscape contractors, and consultants who represent that they can supervise or manage a construction project for the property owner's benefit, including hiring and firing specialty contractors, scheduling the work, and selecting and purchasing construction material.

Contractor is the umbrella term in that section, not the only one. Three parallel definitions divide the same activity by where it is performed: commercial contractor at (A)(2), covering the work everywhere except within residential property lines; residential contractor at (A)(10), covering it within residential property lines on houses, townhouses, condominiums or cooperative units and their appurtenances; and dual licensed contractor at (A)(4), covering either under a single license. That three-way split, crossed with the general and specialty scope tiers, produces six of the seven license classes at A.R.S. § 32-1102 — general engineering is the seventh. Residential contractor excludes an owner making improvements to the owner's own property under A.R.S. § 32-1121(A)(5).

The practical difference between the two statutes is scope. The tax definition is built around modification. The licensing definitions cover repair and alteration on their face. A person can be a contractor for licensing purposes on work that is MRRA and therefore outside the prime contracting classification entirely.

Being a contractor says nothing by itself about which classification applies. That is a property of the contract, and each contract is evaluated separately.

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General contracting is a Registrar of Contractors license scope. A.R.S. § 32-1102 sets four general classes — general commercial building, general dual licensed, general engineering, and general residential — each covering a structure as a whole together with the management or direct or indirect supervision of work performed by other contractors. The specialty classes cover single trades instead.

For tax the term is used but never defined. A.R.S. § 42-5075 uses general contractor once, inside the definition of owner at (S)(8), where it does real work: for the MRRA exclusion, a person hired by a general contractor that was hired by an owner — or a subcontractor of that general contractor — is considered to be hired by the owner. That is the mechanism by which a subcontractor performing maintenance, repair, replacement or alteration keeps the exclusion instead of losing it for want of a direct contract with the property owner.

General contractor is not a synonym for prime contractor. One is a license scope granted by the Registrar; the other is a tax role determined per contract and evidenced by a certificate. A general contractor is often the prime contractor on its projects, and is neither automatically nor invariably.

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A manufactured building is a manufactured home, a mobile home, or a factory-built building, as those terms are defined in A.R.S. § 41-4001.

A manufactured building dealer is either a dealer licensed under A.R.S. title 41, chapter 37, article 4 who sells manufactured buildings to the final consumer, or a person who supervises, performs, or coordinates the excavation and completion of site improvements or the setup of a manufactured building, including contracting with any subcontractor or specialty contractor to complete the contract. Either prong is enough.

The classification is the part contractors miss. A.R.S. § 42-5075(A) states that the prime contracting classification comprises two businesses — prime contracting, and the business of manufactured building dealer. A dealer is therefore taxed under prime contracting, on the same sixty-five percent base, without being a prime contractor in the ordinary sense.

Three carve-outs appear in the same subsection. Sales for resale to another manufactured building dealer are not subject to tax, and a sale to a lessor of manufactured buildings is not a sale for resale. The sale of a used manufactured building is not taxable, and a lease of a used manufactured building is not a sale of one.

Where the tax is owed depends on delivery. If the dealer contracts to deliver the building to a setup site in Arizona or performs the setup, the taxable situs is the setup site. If not, the situs is the dealership location where the building is delivered to the buyer. If the setup site is outside Arizona, the transaction is excluded from tax.

Furniture, furnishings, fixtures, appliances and attachments that are not incorporated as component parts of the building or of the setup site are deducted from the prime contracting base, and their sale may be taxed separately under the retail classification.

At the city level the treatment differs. Model City Tax Code § 415 excludes gross income from the sale of manufactured buildings from construction contracting and directs it to a separate section.

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Materials vendor is a descriptive term rather than a statutory one. The vendor is a retailer, taxed under the retail classification on the sale.

The vendor matters to a contractor because of who is taxed on materials. On an MRRA project the tax attaches to materials rather than to the contract. A contractor who pays the vendor at the register has satisfied that obligation, and the vendor is the party who reports and remits it. A contractor who instead gives the vendor an exemption certificate and buys exempt takes the obligation on, and later remits an amount equal to retail transaction privilege tax on the cost of the materials.

Which certificate a vendor may accept depends on the buyer. A licensed contractor presents Form 5000. An unlicensed contractor cannot complete a Form 5000 properly, having no license number to put on it, and uses Form 5000M for a statutorily exempt purchase, or an approved Form 5009L on a Modification project where the prime has obtained one from ADOR. Form 5005 alone is not an exemption certificate and a vendor should not accept it as one. ADOR's Contracting FAQs describe a Form 5000M presented together with a Form 5005 as the route for an unlicensed contractor on a one-off Modification project; Form 5000M states that it pertains only to maintenance, repair, replacement or alteration projects. Published sources differ, and a vendor relying on the pair on a Modification project is relying on a certificate that excludes the transaction on its face.

A properly completed certificate may be accepted in good faith and retained as the record of why the sale was exempt. An incomplete one may not.

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A contractor's intuition is that the owner is whoever holds the deed. The statute is wider than that, and the width is what makes the MRRA exclusion work.

A.R.S. § 42-5075(S)(8) defines owner as the person that holds title to the real property or improvements that are the subject of the work, as well as an agent of the title holder, and any person with the authority to perform or authorize work on the property or improvements, including a tenant and a property manager.

Why it matters. The MRRA exclusion at § 42-5075(P) applies to a contract with the owner of real property. If owner meant the title holder alone, a tenant's remodel contract and a property manager's repair order would be outside the exclusion and taxable under prime contracting. They are not, because both are owners for this purpose.

A second rule operates inside the same definition, for the MRRA exclusion only. A person hired by a general contractor that was hired by an owner, or a subcontractor of that general contractor, is considered to be hired by the owner. A subcontractor two levels down the chain performing maintenance, repair, replacement or alteration therefore keeps the exclusion.

Owner status does not by itself make a person a prime contractor. A person who owns real property, engages one or more contractors to modify it, and does not modify it themselves is not a prime contractor, regardless of any contract for sale or subsequent sale of the property — subject to two exceptions at § 42-5075(E) and (R). Where an owner improves property for sale, the city Speculative Builder and Owner-Builder classifications are the ones to check.

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A.R.S. § 42-5075(S)(10) defines a prime contractor as a contractor who supervises, performs or coordinates the modification of any building, highway, road, railroad, excavation, manufactured building or other structure, project, development or improvement — including the contracting, if any, with subcontractors or specialty contractors — and who is responsible for the completion of the contract.

Responsibility for completion is the operative half. Supervising or coordinating without carrying that responsibility does not make a party the prime.

The same paragraph then rules out the case contractors most often assume is covered. A person who owns real property, engages one or more contractors to modify it, and does not itself modify it is not a prime contractor — regardless of a contract for sale or a subsequent sale of the property. Two exceptions are named: subsection (E), where a person gives a certificate claiming to be the prime and is deemed to be one, and subsection (R), which reaches an owner who sells and remains responsible for modifications made after title transfers.

Where an owner improves property for sale and neither exception applies, the classification to check is a city one — Speculative Builder or Owner-Builder under the Model City Tax Code, not state prime contracting.

The term also carries a second sense in ordinary trade use: the contractor holding the contract with the property owner and running the project. That usually describes the same party the statute does, but not always, which is why a certificate rather than an assumption establishes who is liable.

The role is decided per contract. A contractor can be the prime on one contract and a subcontractor on the next, and each contract is evaluated independently under (P)(2).

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A specialty contractor performs construction work requiring special skill and involving specialized construction trades or crafts — electrical, plumbing, HVAC, roofing, drywall, glazing. A.R.S. § 32-1102 sets three specialty license classes, specialty commercial, specialty dual licensed, and specialty residential, alongside four general classes.

For tax the term is used but never defined. A.R.S. § 42-5075 includes specialty contractors within the definition of contractor at (S)(3), and provides that a prime contractor may contract with subcontractors or specialty contractors at (S)(10). It supplies no separate definition and attaches no separate treatment.

That is the point worth carrying. A specialty license limits the scope of work a business may perform. It does not decide the classification of any contract that business signs. A specialty contractor working directly for the property owner on a Modification project is the prime contractor on that contract and liable for the tax. The same business working under a prime on the next project is a subcontractor. Each contract is evaluated separately, and the alteration threshold is applied to the specialty contractor's own contract amount in full rather than to a share of the overall project.

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A subcontractor performs work under another contractor rather than contracting directly with the property owner. Nothing about that position is itself a tax answer — two separate provisions can take a subcontractor out of the prime contracting classification, and they work differently.

A.R.S. § 42-5075(D) is the demonstration route. A subcontractor is not subject to tax if it can demonstrate two things: that the work was "within the control of" a prime contractor or a manufactured building dealership, and that the prime or dealership is liable for the tax on the income from which the subcontractor was paid. Both elements are required, and the burden rests with the subcontractor.

A.R.S. § 42-5075(E) is the certificate route, and it is stronger. Amounts received are excluded from the contractor's gross income where the person who hired it executes and provides a certificate stating that they are a prime contractor and liable for the tax. Form 5005 is the Department's prescribed form.

What makes (E) worth more than (D) is its last sentence. If the person who gave the certificate turns out not to be liable as a prime contractor, that person is nevertheless deemed to be the prime contractor in lieu of the contractor, and is taxed on the receipts. The subcontractor's protection therefore does not depend on the certificate having been accurate — liability follows the signature. Where the contractor has reason to believe the information is erroneous or incomplete, the Department may disregard the certificate.

On an MRRA contract the question does not arise in the same form. A subcontractor performing MRRA work is an MRRA contractor and owes tax on the materials it buys and incorporates. Form 5088 is the notice recording that responsibility, and § 42-5075(S)(8) deems a subcontractor hired down a chain from an owner to have been hired by the owner, so the MRRA exclusion reaches it.

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Transaction privilege tax is levied on persons on account of their business activities. The taxpayer is the business. A customer may bear the cost inside the price and never becomes the taxpayer by doing so.

On a Modification project the taxpayer is the prime contractor, on the gross receipts of the contract. A licensed subcontractor holding a Form 5005 is not liable, which is not the same as not being required to report — it still reports its gross receipts and deducts them.

On an MRRA project the answer depends on how the materials were bought. Where the contractor paid tax to the vendor at purchase, the vendor is the taxpayer on that sale and the contractor is a purchaser. Where the contractor bought exempt, the contractor becomes liable for an amount equal to retail transaction privilege tax and is the taxpayer on it. A contractor performing only MRRA work who always pays at the register is not a transaction privilege taxpayer at all, which is why that contractor generally needs no TPT license.

The term is not defined once for all of Arizona tax law. Each code defines it where it needs to, and the Model City Tax Code carries its own definition, referenced by the city construction contracting section. The definition belonging to the provision in hand governs; one meaning should not be assumed across the chapter.

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An automatic warranty is one a contractor includes with the work at no separate charge — a manufacturer's warranty or a warranty provision in the contract — intended to make the property whole in the case of defective workmanship. It is not optional and it is not separately sold.

The governing idea is that it is not a separate transaction. ADOR treats it as if it were part of the original project, and everything else follows from that.

On a Modification project it is part of the taxable gross receipts of that project. Because the warranty is part of the project, materials incorporated in performing warranty work may be purchased exempt, and no retail equivalent is due under business code 315.

On an MRRA project it is not taxable, for the same reason in reverse: the MRRA project was not taxable either. Materials used in performing that warranty work are taxable at the point of purchase, or if bought exempt, the retail equivalent is remitted under business code 315.

So the warranty never has a tax character of its own. It inherits one.

Warranty period services also appear on the other side of the classification question. A.R.S. § 42-5075(O)(1)(a) lists warranty period services among construction phase services, which are not within the design phase exclusion.

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Construction phase services are services for the execution and completion of any modification. A.R.S. § 42-5075(O) excludes design phase services and professional services from the prime contracting tax base and states expressly that the subsection does not include construction phase services.

The category is broad and the statute lists it at (O)(1) rather than leaving it to inference. It covers administration or supervision of modification work, including team management and coordination, scheduling, cost controls, submittal process management, field management, the safety program, the close-out process and warranty period services.

It also covers administration or supervision of work performed under a punch list, under change orders and under change directives; inspection to determine substantial or final completion; preparation of manuals, warranties, as-built drawings and spares the contractor must furnish; status reports after work has begun, including master schedule updates, cash flow projection updates, site reports, and identification of discrepancies or health and safety issues; daily logs including personnel and weather; submittals and shop drawings; and administration of anything else for which the contractor receives a certificate for payment based on progress.

Several of those items look like design work and are not. Preparing an initial schedule is a design phase service; updating the master schedule after work has begun is a construction phase service. Preliminary cost estimates before the final design are design phase; cost controls during execution are construction phase.

The dividing question is not the nature of the document but whether the work develops the design or executes it. A firm doing both writes the separation into the contract before starting, or loses it.

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Design phase services are, in the statute's words, services for developing and completing a design for a project that are not construction phase services.

A.R.S. § 42-5075(O) excludes the gross income attributable to a written contract for design phase services or professional services from the prime contracting tax base — but only where three conditions are all satisfied. The contract must be written. It must be executed before modification begins. And the terms, conditions and pricing of those services must be separately stated in the contract from those for construction phase services.

Pricing is part of the condition, not an afterthought. A contract that describes design work in its own article but carries a single undifferentiated price does not meet the test.

Timing is the condition most often lost. Executed before modification begins means the document has to exist before the work starts; a separation written afterwards does not reach back.

Where the conditions are met, the exclusion applies regardless of whether the services are provided before or alongside taxable prime contracting activity.

The statute enumerates what counts at (O)(2): evaluating surveys, reports, test results and site conditions; evaluating criteria or programming objectives; preparing drawings and specifications; preparing an initial schedule, expressly excluding updates to the master schedule after modification work has begun; preparing preliminary cost estimates before the final design is complete; reviewing and evaluating cost estimates and project documents; and preparing the plan and procedures for selecting subcontractors, including prequalification.

Deduction code 690 carries design phase and professional services. It is available at state level and is not available to cities.

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Development fees are fees imposed to offset capital costs of providing public infrastructure, public safety or other public services to a development. A.R.S. § 42-5075(B)(19)(c) defines them by reference to their authorizing law — section 9-463.05, section 11-1102 or title 48 — and states that the deduction applies regardless of the jurisdiction to which the fees are paid.

The deduction reaches development fees incurred in relation to a contract for construction, development or improvement of real property and paid by a prime contractor or subcontractor. Deduction code 560 carries it, at state and city level.

The attributable amount has two components. It is the total amount of development fees actually paid, plus the total development fees credited in exchange for constructing, contributing to or dedicating real property for public infrastructure, public safety or other public services necessary to the development.

That second component is the one worth reading twice. Where a jurisdiction waives fees because the developer built the road or dedicated the land instead, the credited amount is deductible even though nothing was paid. The real property must be the subject of the development fees.

One ceiling applies: the attributable amount cannot exceed the value of the development fees actually imposed.

Order of operations matters on the return. Statutory deductions are applied before the thirty-five percent reduction is computed, so a development fee deduction reduces the base the reduction is then taken against.

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Where a contractor rents equipment or tools for use in its own business, the rental is subject to transaction privilege tax unless a statutory deduction applies. It makes no difference whether the equipment is used on a Modification project or an MRRA project.

Who owes it is the part worth being precise about. Transaction privilege tax is a tax on the business activity of the person conducting it, so the lessor of the equipment is the taxpayer, reporting under the personal property rental classification. ADOR states that the lessor may pass the economic expense of the tax to the contractor, which is what appears on the invoice.

So a line on a rental invoice reading as tax is the lessor's tax being recovered, not the contractor's liability. The contractor has no filing obligation arising from it.

Rented equipment is also not materials. It is not incorporated into the real property, it is not bought exempt on a contractor's exemption certificate, and it generates no retail equivalent under business code 315.

Where the rental cost is charged on to a customer as part of a contract, it is part of that contract's gross receipts and is treated as the contract is treated.

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An extended warranty is separately sold and optional, whether the contractor sells it or a third-party home warranty company does. That separateness is what distinguishes it from a warranty automatically included with the work.

The charge is not taxable. ADOR states that extended warranties sold by a contractor or by third-party home warranty companies are not taxable pursuant to A.R.S. § 42-5061(A)(3), whether the warranty covered a Modification project, an MRRA project, or was purchased at any other time.

The materials are the part that surprises people. Materials incorporated into projects in the performance of extended warranties are always considered to be incorporated into an MRRA project, and are therefore taxable at the point of purchase, or if purchased exempt, reported as the retail equivalent under business code 315.

Always means always. An extended warranty sold alongside a Modification project does not carry that project's treatment into the warranty work; the original classification is simply not consulted.

That makes it the one warranty case where the classification of the underlying contract does not decide the answer, and the reason it is worth separating from the automatic warranty rather than treating both as warranties.

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Independent functional utility is the test that decides whether installing a piece of equipment is contracting income or something deducted from it.

A.R.S. § 42-5075(B)(7) allows a deduction for gross income from a contract for the installation, assembly, repair or maintenance of machinery, equipment or other tangible personal property that is either deducted from the retail tax base under § 42-5061(B) or exempt from use tax under § 42-5159(B), and that has independent functional utility.

The statute defines the term at (B)(7)(d): the property can independently perform its function without attachment to real property, other than attachment for assembling it, connecting items to each other, connecting it to water, power, gas, communication or other services, or stabilizing or protecting it during operation by bolting, burying or other similar nonpermanent connections.

So the connections a working installation obviously needs do not defeat the test. Bolting a machine to a slab and running power to it is expressly allowed for.

The deduction reaches related work as well: any activity performed on the qualifying property, activity on other tangible personal property in furtherance of the listed purposes, and related activity including inspecting the installation or testing it.

Two limits matter. The deduction does not include the portion of contracting activity that consists of developing or modifying real property in order to facilitate the installation, assembly, repair, maintenance or removal — so preparing the building for the machine is still contracting. And the test is applied without regard to the size or useful life of the property, which forecloses the intuition that something large or permanent-looking must be part of the building.

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Job Order Contracting is an arrangement in which an owner engages a contractor for a specific duration or a general scope of services, and the specific scope is then defined in individual orders issued under it. The master agreement commits to quantities that are not yet known and specifies no construction of its own.

That structure is what makes the tax question unusual, and ADOR answers it directly: each order is considered separately when determining whether the work is an MRRA contract or a Modification contract.

Three consequences follow. Where the arrangement is only for MRRA work, each order is treated as an MRRA contract. Any order involving alteration is evaluated against the applicable alteration threshold on its own. And where an order contains both MRRA and Modification activity, the modification activity must be de minimis — the 15% test — or the entire order is taxable.

The unit of analysis is the order, not the master agreement and not the year's work. A contractor holding one arrangement may report some orders as Modification and deduct others as MRRA, on the same return.

The naming is not consistent across sources and the difference is worth knowing before reading any of them. A.R.S. § 34-101(17) hyphenates the term, defines it as a project delivery method in which the contract is a requirements contract for indefinite quantities of construction, and calls the instruments job orders. ADOR's Contracting FAQs call the arrangement a contracting method and call the instruments work orders. ADOR's mixed-contract worksheet heads the case JOB ORDER CONTRACT.

Section 34-101 is public procurement law rather than tax law. It describes the same structure; it does not decide the tax treatment.

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A.R.S. § 42-5075(M) provides that operating a landfill or a solid waste disposal facility is not subject to taxation under the prime contracting section — including filling, compacting, and creating vehicle access to and from cell sites within the landfill.

That list is the part worth reading twice. Filling and compacting are earthmoving, and § 42-5075(S)(6) defines Modification to include grading and leveling ground without qualification. Left alone, the same activity performed anywhere else would be Modification. Inside a landfill the statute expressly assigns it to operation instead.

The subsection then carves back in the other direction. Constructing roads to a landfill or solid waste disposal facility, and constructing cells within one, may be deemed prime contracting.

The verb is weaker than the rest of the subsection, which says flatly that operating is not subject to tax. "May be deemed" leaves the carve-in conditional without stating the condition, and a contractor building a cell has no test in the statute for which side of the line the work is on.

The operative distinction is between operating the facility and building it. Creating vehicle access to a cell site within the landfill is operation; constructing the road to the facility may be prime contracting. Those two sentences describe work that looks identical on the ground and differ on where it is performed relative to the facility boundary.

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Arizona treats lawn maintenance and landscaping as different things and defines both by enumeration.

A.R.S. § 42-5075(J) provides that gross income from a contract for lawn maintenance services is not subject to tax under the prime contracting section if the contract does not include landscaping activities. Lawn maintenance is a service under the retail section's service provision rather than a construction activity.

A.R.S. § 42-5075(K) provides that, except where the MRRA exclusion applies, gross income from landscaping activities is subject to tax under the prime contracting section.

The condition in (J) is the entire risk. The exemption is tested against the contract, not against the line item, so a single landscaping activity written into a lawn maintenance contract takes the whole contract out of (J).

The two lists come close enough to catch a careful reader. Refreshing gravel is lawn maintenance; installing gravel or boulders is landscaping. Repairing sprinkler or drip irrigation heads is lawn maintenance; installing an underground sprinkler or watering system is landscaping. Pruning or clipping a tree is lawn maintenance; felling it, or removing or mulching the stump, is landscaping.

The practical consequence is contractual rather than operational. A grounds contractor whose crews do both is not wrong to do both — it needs the work written as separate contracts, because one document cannot be partly within (J).

Landscape architect services are a third thing again, included in professional services at (O)(3).

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A project entirely outside Arizona's borders produces no Arizona transaction privilege tax. ADOR states the position plainly and identifies the mechanism: deduction code 681 removes the project from gross receipts.

Reported and deducted is not the same as omitted, and the difference shows on the face of the return. A contractor who simply leaves out-of-state work off the return has reported gross receipts that do not reconcile to its books.

A project on both sides of the line is handled the same way at a finer grain. All gross receipts derived from the project are reported, and the portion related to work conducted out of state is deducted under the same code.

This is a sourcing rule and not a nexus rule, and the two are often confused. An out-of-state contractor performing work on Arizona real property is taxable here because the work happens here. An Arizona contractor performing work on land in another state is not taxable here for the same reason, read the other way. Where the business is based decides neither.

Materials follow their own path. A licensed contractor may buy materials from an out-of-state vendor exempt, and what is owed in Arizona depends on where and how they are used rather than on where they were bought.

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Professional services is a closed list in the statute rather than a general description. A.R.S. § 42-5075(O)(3) defines it as architect services, engineer services, geologist services, land surveying services or landscape architect services that are within the scope of those services as provided in title 32, chapter 1.

Nothing else qualifies, however professional. Project management, consulting and construction management are not on the list.

The exclusion runs on the same conditions as design phase services: a written contract, executed before modification begins, with terms, conditions and pricing separately stated from construction phase services.

A second condition is inside the definition and is easy to miss. The services qualify only where the gross income has not otherwise been deducted under subsection (L), which covers the actual direct costs of providing architectural or engineering services incorporated in a contract. The same architectural income cannot be taken twice under two provisions.

The two routes have different deduction codes and different scope. Deduction 557 carries the actual direct costs of architectural or engineering services and is available to state and city. Deduction 690 carries design phase and professional services and is not available to cities.

Landscape architect services are professional services under this paragraph. Landscaping as a construction activity is a different subject with a different answer.

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The same business can be a retailer on one transaction and a contractor on the next, and what decides it is whether the seller is paid for installing the goods into real property.

ADOR's example is flooring. A seller who provides the flooring and arranges to have it installed is no longer a retailer but a contractor, and the amount paid for both the flooring and the installation is taxed under construction contracting. The same seller who sells the flooring without arranging the installation, and receives no payment for it, is a retailer.

Arranging is the trigger. A seller who hires and pays the installer has crossed the line even though someone else does the work.

Having a showroom does not make a business a retailer. ADOR states that a contractor with samples of materials in a showroom, whose customers choose materials the contractor then installs, is a contractor when it sells and installs the materials into real property.

The boundary is real property, not installation as such. A person who sells tangible personal property and installs it into something that is itself tangible personal property — ADOR gives a car or a recreational vehicle — is taxable under the retail classification, and installation kept separate from the retail sale on the invoice and in the books and records is a service rendered in addition to the retail sale, which is exempt under that classification.

Once the activity is contracting, the contracting rules apply in full, including whether the contract is MRRA or Modification.

One threshold underlies all of this and is easy to miss. A.R.S. § 32-1121(A)(4) exempts a retailer from Registrar licensing where it installs what it sells and the total value of the transaction, labor and materials together, does not exceed $1,000. Because § 42-5075(A) excludes from prime contracting any work performed by a person not required to be ROC-licensed, a small sale-and-install transaction can be outside contracting entirely and taxable under retail — the opposite result from the same facts at a higher price.

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A.R.S. § 42-5122 exempts from the taxes imposed by chapter 5 the gross proceeds of sales or gross income from six categories, four of which a contractor meets.

Two reach contracting directly. Paragraph (3) exempts contracting activities performed on an Indian reservation by the Indian tribe, a tribally owned business, a tribal entity or an affiliated Indian. Paragraph (4) exempts contracting activities performed for the tribe, a tribal entity or an affiliated Indian on the reservation by a nonaffiliated Indian or non-Indian contractor — which is the ordinary case for an outside contractor taking reservation work.

Two reach the surrounding transactions. Paragraph (2) exempts business activities performed on the reservation by a nonaffiliated Indian or non-Indian vendor for the tribe or an affiliated Indian. Paragraph (5) exempts retail sales of tangible personal property to them where the sale takes place on the reservation, and deems a sale to take place there where the property is ordered from and delivered on the reservation.

What distinguishes this from most contracting exemptions is reach. It exempts the contract itself, not merely the materials, so a Modification project for a tribe on the reservation produces no prime contracting tax on the contract amount.

The materials side is covered separately, and only for MRRA. A.R.S. § 42-5061(A)(58) deducts from the retail base, and § 42-5159(A)(55) exempts from use tax, tangible personal property incorporated or fabricated into a project described in § 42-5075(P) — an MRRA project — located within the exterior boundaries of a reservation where the project's owner, as § 42-5075 defines owner, is an Indian tribe or an affiliated Indian.

Three conditions carry the whole thing, and all three are about who and where rather than what the work is. The work is on the reservation. The party it is performed for is the tribe, a tribal entity or an affiliated Indian. And for the materials provisions, that party is the owner of the project.

Change any one and the exemption is not established. Work on reservation land for a non-Indian lessee is not within paragraph (4) on its face, because the party contracted for is not one the paragraph names.

Form 5000M lists contracting on a reservation among the grounds on which an unlicensed contractor may buy materials exempt.

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A work order is the document that specifies what will actually be built under an arrangement that did not specify it. The master agreement fixes duration, rates and a general scope; the work order fixes the work.

Under a Job Order Contracting arrangement, ADOR treats each work order as the unit of classification. Each is assessed separately as MRRA or Modification, each order involving alteration is tested against the alteration threshold on its own, and a mixed order is taxable in full unless its modification content is de minimis — the 15% test.

That is consistent with how contracts are treated generally: A.R.S. § 42-5075(P)(2) makes each contract independent of any other, and ADOR states that the taxability of a contract and of subsequent change orders is determined separately.

A work order is not a change order, and the two are decided differently. A change order modifies an existing contract, and one that directly relates to the original scope of work is treated the same as that contract. A work order under a Job Order Contracting arrangement is assessed on its own terms.

The vocabulary is not settled across sources. A.R.S. § 34-101(17) calls these instruments job orders; ADOR's Contracting FAQs call them work orders; both describe orders issued during the life of a master agreement to specify construction.

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Alteration is the only one of the four MRRA activities with a ceiling. Above it the work is Modification and prime contracting tax applies to the contract; below it the work is MRRA and tax applies to the materials.

On residential property the threshold is 25% of the parcel's most recent full cash value. On all other existing property it is a flat $750,000.

The statute removes alteration status only where the amount is more than the threshold, so a contract at exactly the threshold keeps it. ADOR's written response of August 13, 2026 states the same boundary from the other direction — the value of the alteration contract should be 25% or less of the parcel's full cash value.

The denominator is full cash value. The statute names it and never mentions limited property value; ADOR Tax Policy confirmed in writing that limited property value is not the measure. Full cash value is the county assessor's figure and is public record.

The residential test uses two lookups rather than one: the most recent full cash value as of the date of any bid for the work, and as of the date of the contract, whichever value is higher.

On a contract that mixes alteration with maintenance, repair or replacement, only the alteration charges are compared with the threshold. The statute tests "the contract amount"; ADOR Tax Policy stated in writing on September 30, 2026 that the phrase refers to contracts that are purely alteration, and that a mixed contract is tested on its itemized alteration charges, as ADOR's Evaluating Mixed Construction Contracts worksheet does at steps 3a and 3b. Maintenance, repair and replacement carry no threshold, so their charges never count toward it.

The threshold is not settled once. Scope-related change orders are added into the contract amount, so it is retested as they arrive. And a project that exceeds it at completion may still qualify as an alteration under the 25% cushion.

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Commercial is a residual, not a category. A.R.S. § 42-5075(S)(1)(b) applies to all existing property other than the property described in subdivision (a), and sets the alteration threshold at $750,000.

ADOR's worksheet names the classes it covers: one, five, six, seven, eight and nine. Reading the two statutes together, one more category belongs on this side — class two property outside the two nonprofit subdivisions the residential paragraph names, including the residual "all other real property and improvements" at § 42-12002, paragraph 1, subdivision (f).

The practical difference is that the commercial figure is fixed. The residential threshold is a percentage, so it rises with the parcel's value; a valuable lot carries a high threshold and a modest one carries a low threshold. The commercial threshold does not move at all. An alteration of more than $750,000 exceeds the threshold on a small building and on a large one alike, and a contractor working commercial property gets no benefit from the property being worth more.

That also means the commercial threshold requires no valuation lookup. There is no denominator to obtain from the county assessor and no bid-date-against-contract-date comparison to run.

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The dollar figure compared against the alteration threshold. On a contract that is only alteration work, it is the contract price.

On a contract that mixes alteration with maintenance, repair or replacement, only the alteration charges are compared with the threshold. A.R.S. § 42-5075(S)(1)(a) and (S)(1)(b) test "the contract amount," and ADOR Tax Policy stated in writing on September 30, 2026 that the phrase refers to contracts that are purely alteration. A mixed contract is tested on its itemized alteration charges, as ADOR's Evaluating Mixed Construction Contracts worksheet does at steps 3a and 3b and the MRRA Contracting page does in testing "the alteration amount." Maintenance, repair and replacement carry no threshold, so their charges never count toward it.

ADOR's worked example: a residential parcel with a full cash value of $500,000, so a threshold of $125,000, and a $150,000 contract holding $100,000 of alteration and $50,000 of replacement. The $100,000 of alteration is under the threshold, so the contract does not convert to Modification, and the $50,000 of replacement does not push it over.

The answer covers the commercial $750,000 threshold as well as the residential percentage.

A change order that directly relates to the scope of work of the original contract is treated as part of that contract, and the contract amount includes any amount attributable to it. The threshold is therefore retested as change orders arrive rather than settled once at execution.

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Each county's assessor values locally assessed property. By December 15 each year the assessor identifies all real property in the county subject to taxation and not valued by the Department of Revenue, determines its full cash value as of January 1 of the following year using ADOR's manuals and procedures, and lists it on the tax roll. Identification runs on aerial photography, ADOR records, building permits and other documentary sources.

Before March 1 each year the assessor notifies each owner of record of the parcel's full cash value and limited property value, if applicable. That date is not absolute: it is subject to an exception at A.R.S. § 42-13254, and the director may extend it by up to thirty days for delays caused by an act of God, flood, fire or a declared state of emergency. An extension applies to all property valued by the assessor, not to individual parcels.

For a contractor the assessor is the source of one number: the denominator in the residential alteration threshold. A.R.S. § 42-5075(S)(1)(a) points at the most recent full cash value established under title 42, chapter 13, article 2 — the article that assigns this work to assessors.

ADOR Tax Policy directed contractors to obtain that figure from the county assessor's website, which matters more than it sounds. The value is public record and can be pulled before a bid goes out, with no involvement from the property owner and no waiting on the owner's annual notice.

ADOR's response supplied Maricopa County's parcel viewer as its example. The example is illustrative only — a parcel is searchable through its own county's assessor and no other, so a Yavapai or Coconino parcel is not retrievable from Maricopa's system.

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Full cash value is the figure the residential alteration threshold is measured against, and A.R.S. § 42-11001(6) defines it in two steps. It means the value determined as prescribed by statute; where no statutory method is prescribed, it is synonymous with market value, meaning the estimate of value derived annually using standard appraisal methods and techniques.

A ceiling governs both steps. Full cash value shall not be greater than market value regardless of the method prescribed to determine it. So a statutory method may produce a figure below market value but never above it.

For the residential alteration threshold, full cash value governs. A.R.S. § 42-5075(S)(1)(a) names it and does not mention limited property value at all, and ADOR Tax Policy confirmed in writing on August 13, 2026 that full cash value is the figure, directing contractors to the county assessor's website for the parcel. That response also states the test from the inclusive direction: the value of the alteration contract should be 25% or less of the parcel's full cash value. On a contract that combines alteration with other work, only the alteration charges are compared with that figure, as ADOR Tax Policy confirmed in writing on September 30, 2026.

The two valuations divide the property tax system between them. Full cash value is the basis for assessing and levying primary and secondary property taxes on the property described at A.R.S. § 42-13304; limited property value is the basis for all other property. Both appear on the same assessor record, and nothing on it says which one a contractor wants.

They are frequently different figures, and using the wrong one can place a contract on the wrong side of the threshold. Full cash value is obtained from the assessor for the county the parcel is located in.

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Limited property value is a statutory brake on property tax growth. Each year it is the prior valuation year's limited property value plus five percent, and it may never exceed the parcel's current full cash value. It is shown on notices and tax rolls as one total for the property, with no separate figures for land and improvements.

It is not the measure for the alteration threshold. A.R.S. § 42-5075(S)(1)(a) names full cash value and does not mention limited property value at all. ADOR Tax Policy confirmed in writing on August 13, 2026 that the most recent full cash value governs, not the limited property value.

The entry exists so the wrong number is identifiable, because the two appear side by side on the same record and nothing labels one as the tax figure. Limited property value climbs five percent a year regardless of the market, while full cash value tracks market conditions. In a rising market the limited figure runs materially below the full cash value.

Using it produces a smaller denominator, which produces a smaller threshold, which pushes contracts over the line that are in fact under it. The error runs toward over-taxing the contract, not under-taxing it.

Limited property value has its own purposes elsewhere: computing levy limitations for counties, cities, towns and community college districts, and levying primary and secondary property taxes on all property except the categories at A.R.S. § 42-13304.

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Before March 1 each year the county assessor notifies each owner of record — or a purchaser under a deed of trust or agreement of sale — of the property's full cash value and its limited property value, if applicable, to be used for assessment purposes. The notice is in writing, mailed, delivered by common carrier, or transmitted electronically at the taxpayer's request.

Two figures, one document, nothing on it labeling which one a contractor needs. They routinely differ by a material amount, because limited property value grows by five percent a year off the prior year's limited value while full cash value tracks the market. Limited property value may never exceed full cash value, so in a rising market it runs below.

Full cash value is the one. ADOR Tax Policy confirmed in writing on August 13, 2026 that the most recent full cash value governs the residential alteration threshold, not the limited property value, and stated the test from the inclusive direction: the value of the alteration contract should be 25% or less of the parcel's full cash value.

The Notice is not the route a contractor should plan on. It goes to the owner, not to the contractor, and it arrives once a year. The same full cash value is public record and can be pulled from the county assessor's parcel search at any time.

A notice can be amended, which matters to a threshold measured against the most recent value. Within sixty days of mailing, if the assessor discovers that property characteristic data applied to a grouping of properties — by neighborhood or by classification — produced an incorrect opinion of value, the assessor may amend the notice and must notify the owner of the amended value. So the figure a contractor pulled in March is not guaranteed to be the figure that stands in May.

The Notice also starts an appeal clock for the owner. A petition for review of an improper valuation or classification is filed with the assessor within sixty days after the date the assessor mailed the notice of valuation — or the amended notice, which restarts it. Postal service postmark dates are evidence of the filing date.

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The parcel is the unit Arizona property valuation operates on. The county assessor identifies real property parcel by parcel, determines a full cash value for each, and lists it on the tax roll.

The statute directs the residential alteration threshold to the most recent full cash value established under title 42, chapter 13, article 2 — the article governing property valuation by assessors. Under § 42-13051 the assessor identifies real property parcel by parcel and determines the full cash value of that property. The unit valued is the parcel, land and improvements together.

Which means the land is in the number. On a lot with meaningful land value the residential threshold is materially higher than the house alone would suggest, and a contractor who reasons from what the structure is worth will compute a threshold that is too low.

For limited property value the statute is explicit about it. A.R.S. § 42-13301(C) requires that figure to be shown on notices and tax rolls as one total for the property, and bars separate determinations for land and for the improvements on it. No equivalent sentence is written for full cash value; there, the parcel is the unit because the parcel is what the assessor values.

Neither A.R.S. § 42-5075 nor the property tax definitions at § 42-11001 define the term. It is the assessor's working unit, and it is how a value is looked up — by parcel, at the assessor for the county in which the property is located.

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Arizona sorts every parcel into a legal class, numbered one through nine, at A.R.S. §§ 42-12001 through 42-12009. The class drives the assessment ratio used to compute property tax, and it is assigned by the county assessor from the property's use.

For contracting it does one thing. A.R.S. § 42-5075(S)(1)(a) applies the residential alteration threshold — 25% of full cash value — by naming classes rather than by describing use. Everything the paragraph does not name takes the flat $750,000 threshold instead.

The named categories are narrower than they first appear. The paragraph reaches class two property under § 42-12002, paragraph 1, subdivision (c) or paragraph 2, subdivision (c), used for residential purposes; class three under § 42-12003; and class four under § 42-12004. Those two class two subdivisions are the nonprofit-owned ones — real property at paragraph 1, personal property at paragraph 2, each owned and controlled by an organization exempt under section 501(c)(3), (4), (7), (10) or (14) of the internal revenue code. Class two property in any other subdivision, including the residual "all other real property" at paragraph 1, subdivision (f), is not reached.

The classification is the assessor's determination and is appealable. A petition for review of an improper valuation or classification is filed with the assessor within sixty days after the notice of valuation is mailed.

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For the alteration threshold, residential is a property tax classification rather than a description. A house is not residential property because someone lives in it; it is residential property because the assessor placed the parcel in one of the classes the statute names.

A.R.S. § 42-5075(S)(1)(a) reaches three things. Class three property under § 42-12003 — real and personal property used for residential purposes and occupied by the owner as a primary residence, occupied by a qualifying relative as a primary residence, or occupied by the owner as a primary residence and also rented to lodgers. Class four property under § 42-12004 — a wider residential category covering property used for residential purposes and not otherwise classified, property used residentially and solely leased or rented, licensed child care facilities, nonprofit residential housing and licensed care institutions for persons with disabilities or aged sixty-two and over, small bed-and-breakfast operations, agricultural employee dwellings, common areas, timeshares and low-income multifamily rentals. And class two property under § 42-12002, paragraph 1, subdivision (c) or paragraph 2, subdivision (c), used for residential purposes.

Those two class two subdivisions are the nonprofit-owned ones — real property at paragraph 1, personal property at paragraph 2, owned and controlled by an organization exempt under section 501(c)(3), (4), (7), (10) or (14). The paragraph therefore does not reach every class two parcel used residentially, only nonprofit-owned ones.

ADOR's Evaluating Mixed Construction Contracts worksheet states the residential definition more narrowly than the statute, citing only § 42-12002, paragraph 1, subdivision (c) and omitting paragraph 2, subdivision (c). The statute reaches both.

Acreage matters to the denominator, and the rule is the same in both of the residential classes. A homesite in class three under § 42-12003(B), or in class four under § 42-12004(A)(1), may include up to ten acres on the single parcel the residential improvement occupies — or more than ten and up to forty, where the parcel is zoned exclusively for residential purposes or carries legal restrictions or physical conditions preventing its division. Physical conditions are defined as topography, mountains, washes, rivers, roads or any other configuration limiting the residentially usable land area.

All of that land is within the full cash value the threshold is measured against. On a forty-acre homesite the denominator is large, and the contract that would breach the threshold is correspondingly large.

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A project priced under the alteration threshold can finish above it. The cushion keeps that project an alteration anyway, within a limit.

The statutory rule has two conditions and one measure. The owner and the person performing the work must both have reasonably believed, at the inception of the contract, that the work would be treated as an alteration. On completion the project must have exceeded the applicable threshold by not more than 25% of that threshold. Where both hold, the work performed under the contract qualifies as an alteration.

The arithmetic is a percentage of the threshold, not of the contract. Commercial: $750,000 plus a $187,500 cushion allows completion at $937,500. Residential, on a parcel with a full cash value of $200,000: a $50,000 threshold plus a $12,500 cushion allows completion at $62,500. Because the residential threshold varies by parcel, so does the cushion, and each has to be computed for the specific property.

The statute grants the cushion where the threshold is exceeded "for any reason." ADOR's guidance is narrower, in two ways the statute does not state. The Evaluating Mixed Construction Contracts worksheet presents the cushion as available where the overrun arose "due to the change orders." The MRRA Contracting page states that a project remains an alteration contract as long as it does not contain maintenance, repair, or replacement elements at the time the contract is bid or entered into.

That second restriction is less settled than it reads. A further paragraph on the same page sends a mixed contract whose alteration portion exceeds the threshold by more than 25% back to the worksheet for reevaluation — an overrun already outside the cushion. Between the two paragraphs the page never addresses a mixed contract that overruns by 25% or less, which is exactly the case the statute grants. Neither restriction appears in A.R.S. § 42-5075(S)(1)(d), and the statute governs where they diverge.

The reasonable-belief condition is bilateral and is tested at the inception of the contract, not at completion.

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For real property the valuation year is the calendar year preceding the year in which taxes are levied, and the valuation date within it is January 1. The assessor determines full cash value as of January 1 for the following year's roll, which is why a value carries a year label and why the current figure is always describing a date already past.

The label matters for one reason. A.R.S. § 42-5075(S)(1)(a) asks for the most recent full cash value as of the date of any bid for the work, or the date of the contract, whichever value is higher. That is a comparison of two lookups, not a single retrieval.

Where the two dates are separated by a new valuation — notices go out before March 1 each year — they return different figures, and the statute takes the higher one. The higher value is the larger denominator, which is the larger threshold, which is the reading that favors alteration status.

An intake that records a single valuation is under-specified and will tend toward the lower figure. ADOR's worksheet records the year alongside the value at step 2c, with columns for Property Tax Value and Valuation Year, which is the right shape — but the worksheet asks for one value where the statute asks for two.

The commercial threshold sidesteps all of this. It is a flat $750,000 with no valuation and no year.