Arizona — Corporate Income / Franchise Tax

Arizona imposes a corporate income tax on every corporation's entire Arizona taxable income unless exempt under A.R.S. § 43-1126 or § 43-1201. Every corporation subject to the Arizona Income Tax Act of 1978 must file an Arizona corporate income tax return, even if the corporation has no federal taxable income or a federal return is not required. A limited liability company that makes a valid federal election to be taxed as a corporation must also file an Arizona corporate income tax return. A single-member LLC that is disregarded as an entity for federal income tax purposes is treated as a branch or division of its owner and is included in the owner's tax return.

For taxable years beginning from and after December 31, 2016, the tax is the greater of $50 or 4.9% of the corporation's net income.

Source: A.R.S. § 43-1111; ADOR Corporate Income Tax page

Arizona imposes corporate income tax on each corporation with a "business situs" in Arizona, measured by taxable income that is the result of activity within or derived from sources within Arizona. The state exercises its taxing power to the fullest extent constitutionally permissible, subject to federal limitations including Public Law 86-272.

Public Law 86-272 protects out-of-state corporations whose only in-state activity is soliciting orders for sales of tangible personal property, where the orders are approved and filled from outside Arizona. This federal protection does not apply to sales of services, intangibles, or digital products, nor does it protect corporations that perform post-sale services, maintain inventory, or conduct other business activities in Arizona beyond mere solicitation.

A corporation that exceeds the protection of P.L. 86-272 has nexus if it engages in business activity in Arizona. Arizona has not enacted specific economic nexus thresholds (such as dollar or transaction counts) for corporate income tax purposes, distinguishing it from the state's transaction privilege tax rules.

Source: A.R.S. § 43-102.A.5; ADOR Corporate Income Tax Nexus Program

Arizona corporate income tax returns are due on or before the fifteenth day of the fourth month following the close of the taxable year. For calendar-year corporations, the return is due April 15.

If the corporation obtains a valid federal extension under the Internal Revenue Code, the Arizona filing deadline is automatically extended to match the extended federal due date, without requiring a separate Arizona extension request. However, an extension of time to file does not extend the time to pay the tax. Any unpaid tax owed after the original due date accrues interest during the extension period.

Source: A.R.S. § 43-329

Arizona taxable income for a corporation is defined as Arizona gross income adjusted by the modifications specified in A.R.S. §§ 43-1121 and 43-1122. Arizona gross income starts with federal taxable income as computed under the Internal Revenue Code. Arizona law adopts the provisions of the IRC relating to the measurement of corporate taxable income, with the intent that the amount reported to the IRS each year is the starting point for Arizona, subject only to Arizona-specific modifications.

A.R.S. § 43-1121 requires additions to Arizona gross income for items including interest on non-Arizona state and local bonds, income-based taxes paid to other states, and certain partnership income adjustments. A.R.S. § 43-1122 allows subtractions from Arizona gross income for items including certain controlled-corporation dividends and specific depreciation adjustments. The statutes enumerate the complete lists of required modifications.

Source: A.R.S. § 43-1101(2); A.R.S. § 43-102; A.R.S. § 43-1121; A.R.S. § 43-1122

For tax years beginning after December 31, 2016, Arizona corporations apportion business income by electing one of two formulas: (1) a double-weighted sales factor formula, calculated as (property factor + payroll factor + 2 × sales factor) ÷ 4; or (2) a single sales factor formula using only the sales factor. Taxpayers make this election annually when filing. Corporations engaged in air commerce, where at least 50% of gross income derives from air commerce, must use a special revenue aircraft miles formula instead of the standard formulas.

Source: A.R.S. § 43-1139

Arizona sources sales to the state differently depending on whether the sale is of tangible personal property or other types of receipts. These sourcing rules determine the numerator of the sales factor used in Arizona's apportionment formula.

Sales of tangible personal property

Sales of tangible personal property are in Arizona if the property is delivered or shipped to a purchaser within Arizona. This is a destination-based sourcing rule that follows the physical location where the customer receives the goods.

Sales other than tangible personal property

For sales other than tangible personal property—including services, intangibles, and digital products—Arizona uses a cost-of-performance sourcing method under A.R.S. § 43-1147(A). Sales are in Arizona if either:

1. The income-producing activity is performed in Arizona, or
2. The income-producing activity is performed both in and outside Arizona and a greater proportion of the income-producing activity is performed in Arizona than in any other state, based on costs of performance.

"Income-producing activity" means the transactions and activities directly engaged in by the taxpayer in the regular course of its trade or business for the ultimate purpose of obtaining gains or profit. This includes activities such as the rental, leasing, licensing, or other use of tangible or intangible personal property. Under Arizona regulation, the determination is made separately for each item of income based on where the taxpayer's costs are incurred to generate that specific revenue stream.

Multistate service provider election

For taxable years beginning from and after December 31, 2013, qualifying "multistate service providers" may elect to use market-based sourcing instead of cost-of-performance sourcing under A.R.S. § 43-1147(B). This election is binding for five consecutive taxable years and may be revoked earlier only with Department permission.

A multistate service provider is generally a taxpayer that derives more than 85% of its sales from services or intangibles provided to purchasers who receive the benefit of the service outside Arizona. Under the market-based sourcing election, services are sourced based on where the purchaser "received the benefit of the service." If the state where services are received cannot be readily determined, services are considered received at the home of the customer (for individuals) or the office from which services were ordered in the regular course of business (for businesses). If the ordering location cannot be determined, services are considered received at the home or office to which the services were billed.

The election also applies to specific categories of taxpayers, including regionally accredited institutions of higher education with campuses in Arizona and certain large employers providing support services to such institutions, subject to additional statutory conditions.

Key distinction from transaction privilege tax

Arizona's corporate income tax sales factor sourcing rules are distinct from the state's transaction privilege tax (sales tax) rules. Practitioners must apply the income tax sourcing statutes—A.R.S. §§ 43-1146 and 43-1147—when computing the apportionment formula, not the TPT sourcing provisions found in Title 42.

Source: A.R.S. § 43-1146; A.R.S. § 43-1147; AZDOR Decision 2018-00188-C (discussing A.A.C. R15-2D-806)

Arizona uses a static (fixed-date) conformity approach to the Internal Revenue Code, meaning the state adopts the IRC as it existed on a specific date set by statute, rather than automatically adopting federal changes as they occur. The conformity date determines which version of the IRC applies when computing Arizona taxable income from the federal taxable income starting point.

Current conformity date

For taxable years beginning from and after December 31, 2024, Arizona defines "Internal Revenue Code" to mean the United States Internal Revenue Code of 1986, as amended, and in effect on January 1, 2025, including those provisions that became effective during 2024 with the specific adoption of all retroactive effective dates, but excluding any changes to the IRC enacted after January 1, 2025. This conformity date was established by House Bill 2688, enacted by the 57th Legislature, 1st Regular Session (2025).

For taxable years beginning in 2024, the conformity date was January 1, 2024 (adopting IRC changes made during 2023), as set by prior legislation.

This static conformity approach means that for any given tax year, corporations computing Arizona taxable income apply the IRC as it existed on the conformity date in effect for that year. Any federal tax law changes enacted after the applicable conformity date do not apply for Arizona purposes unless and until the Arizona Legislature amends A.R.S. § 43-105 to adopt them.

Annual legislative update process

Each year, the Arizona Legislature considers whether to amend A.R.S. § 43-105 to conform to changes made to the Internal Revenue Code during the prior calendar year. Under A.R.S. § 43-107, "conformity" means an amendment to § 43-105 that results in adoption of the definition of the IRC for the taxable year, while "nonconformity" means either (1) conformity plus another amendment that does not conform to specific IRC provisions, or (2) no amendment to the definition of IRC for the taxable year.

The Arizona Department of Revenue is required to prepare and submit to the Legislature, by January 10 each year, a report containing a summary of all revisions made to the IRC during the preceding calendar year. The Legislature then decides whether to enact conformity legislation, which historically has occurred in the spring. For example, on March 3, 2023, Governor Hobbs signed Senate Bill 1171, conforming to federal changes made during 2022. On March 23, 2022, Governor Ducey signed Senate Bill 1264, conforming to federal changes made during 2021.

Practical impact of static conformity

Because Arizona uses static rather than rolling conformity, there is a period during which the state's conformity date lags behind current federal law. Corporations must track which version of the IRC applies for Arizona purposes and make adjustments on the Arizona return for any federal provisions enacted after Arizona's conformity date.

Arizona may also choose to decouple from specific federal provisions even when generally conforming to a given year's IRC. Such decoupling creates permanent modifications, which taxpayers apply as additions to Arizona gross income under A.R.S. § 43-1121 or subtractions under A.R.S. § 43-1122. For instance, Arizona has maintained permanent additions and subtractions related to bonus depreciation despite conforming to other IRC provisions.

The annual conformity process creates uncertainty early in each calendar year, particularly when significant federal tax legislation is enacted. Taxpayers who file Arizona returns before the Legislature acts on conformity must use the prior year's conformity date and may need to amend their returns if Arizona subsequently conforms with retroactive effect.

Source: A.R.S. § 43-105; A.R.S. § 43-107; AZDOR Conformity to IRC

Arizona corporations that are part of a commonly owned or controlled group may be required to file a combined return if they constitute a unitary business, or may elect to file a consolidated return if they are members of an affiliated group that files a federal consolidated return. The choice of filing method—separate, combined, or consolidated—depends on the ownership structure and the operational integration of the group.

Department authority to require combined filing

Under A.R.S. § 43-941, the Arizona Department of Revenue may distribute, apportion, or allocate gross income, deductions, credits, or allowances between or among affiliated taxpayers if it determines that such action is necessary to prevent tax evasion or to clearly reflect income. For the purpose of enforcing this authority, the Department may require the filing of a combined report and such other information as it deems necessary, unless the taxpayer has elected or is required to file a consolidated return pursuant to A.R.S. § 43-947.

This statute applies to "any case of two or more persons, organizations, trades or businesses, whether or not organized in the United States and whether or not affiliated, owned or controlled directly or indirectly by the same interests." The Department's power to require combined filing is discretionary and is exercised when necessary to prevent evasion or to clearly reflect income.

Three threshold requirements for unitary business determination

Arizona Administrative Code R15-2D-401 establishes three necessary threshold characteristics that must all be present before entities can be treated as a unitary business. As summarized in AZDOR Corporate Tax Ruling CTR 95-3 and CTR 94-1, these threshold requirements are:

1. Common ownership or control: The entities comprising the unitary business must be owned or controlled, directly or indirectly, by the same interests that collectively own more than 50 percent of the voting stock.

1. Common management: The entities or components must share common management.

1. Reconciled accounting systems: The entities or components must have reconciled accounting systems.

The presence of these three characteristics is not sufficient by itself. Arizona additionally requires evidence of substantial operational integration at the basic operational level before a business is treated as unitary. An entity, group of entities, or components of an entity is not a unitary business for apportionment purposes unless there is actual substantial interdependence and integration of the basic operations of the business carried on in more than one taxing jurisdiction. The potential to operate an entity or a component as part of the unitary business is not dispositive.

Centralized top-level management, financing, accounting, insurance and benefit programs, or overhead functions by a home office are not sufficient for a business to be unitary without further analysis of the basic operations of the components.

Operational integration tests

For manufacturing, producing, or mercantile businesses, the regulation requires a substantial transfer of material, products, goods, technological data and processes, or machinery and equipment between the branches, divisions, subsidiaries, or affiliates. A transfer of 20 percent or more of the total goods annually is presumptive evidence of a unitary business. A smaller percentage of goods transferred may be indicative of a unitary business if other characteristics indicating substantial operational integration are present.

The determination of whether the operations of a taxpayer constitute a unitary business is based on economic substance and not form. A unitary business may consist of part of a corporation, one corporation, or many corporations. If the unitary business consists of more than one corporation, the corporations comprising the unitary business must file a combined return apportioning the business income of the corporations using a single apportionment formula.

Consolidated return election as an alternative

Under A.R.S. § 43-947, the common parent of an affiliated group of corporations that files a federal consolidated return may elect to file an Arizona consolidated return. This election provides an alternative filing method for affiliated groups. Federal law defines an affiliated group under I.R.C. § 1504 as one or more chains of includible corporations connected through stock ownership (generally 80 percent or more of the voting power and value of the stock) with a common parent corporation. The Arizona consolidated return election is distinct from the combined-return requirement and is available regardless of whether the group constitutes a unitary business under the operational-integration tests in A.A.C. R15-2D-401.

Filing method summary

A corporation files on a combined basis when it is part of a unitary group of companies whose parts and component functions are integrated and interdependent at the basic operational level, with more than 50 percent common ownership or control. A corporation files on a consolidated basis when the common parent of an affiliated group that files a federal consolidated return elects to file an Arizona consolidated return under A.R.S. § 43-947. A corporation that is not part of a unitary business and does not elect consolidated filing files a separate-company return.

Source: A.R.S. § 43-941; AZDOR Corporate Tax Ruling CTR 95-3 (discussing A.A.C. R15-2D-401); AZDOR Corporate Tax Ruling CTR 94-1 (discussing A.A.C. R15-2D-401)

Arizona's corporate income tax framework divides a multistate taxpayer's income into two mutually exclusive categories: business income, which is apportioned among states using a formula, and nonbusiness income, which is allocated to specific states based on the location or domicile of the income-producing asset. This classification determines whether income is subject to Arizona's apportionment formula or is instead directly allocated to Arizona (or away from Arizona).

Statutory definitions

Arizona Revised Statutes § 43-1131, part of the state's adoption of the Uniform Division of Income for Tax Purposes Act (UDITPA), provides the controlling definitions. Under A.R.S. § 43-1131(1), "business income" means income arising from transactions and activity in the regular course of the taxpayer's trade or business and includes income from tangible and intangible property if the acquisition, management and disposition of the property constitute integral parts of the taxpayer's regular trade or business operations.

This definition establishes two alternative tests for qualifying income as business income:

1. Transactional test: Income arises from transactions and activity in the regular course of the taxpayer's trade or business. This test applies broadly to operating income and does not require the three-element functional analysis.

1. Functional test: Income from tangible or intangible property qualifies as business income if the acquisition, management, and disposition of the property constitute integral parts of the taxpayer's regular trade or business operations. For property income, all three activities—acquisition, management, and disposition—must be integral to the business.

Income that satisfies either test is business income. However, for property-related income (such as capital gains, interest, dividends, rents, or royalties), the functional test provides an additional path to business income classification when the property itself plays an integral operational role, even if the specific transaction generating the income is not a regular business activity. The conjunction "and" in the functional test means that passive investment property—where acquisition, management, or disposition is not integral to business operations—produces nonbusiness income even if the taxpayer is otherwise engaged in active business.

Nonbusiness income is defined residually under A.R.S. § 43-1131(4) as all income other than business income. This negative definition means that income failing both the transactional test and the functional test is classified as nonbusiness income.

Treatment of business vs. nonbusiness income

The classification has direct consequences for how income is taxed by Arizona:

• Business income is apportioned to Arizona using the taxpayer's apportionment formula under A.R.S. § 43-1139. For tax years beginning after December 31, 2016, taxpayers elect annually between a double-weighted sales factor formula or a single sales factor formula. Only the portion of business income apportioned to Arizona is subject to Arizona corporate income tax.

• Nonbusiness income is allocated under the specific allocation rules in A.R.S. §§ 43-1134 through 43-1138. The allocation method depends on the type of income. For example, under A.R.S. § 43-1136, capital gains and losses from sales of intangible personal property (such as stock or partnership interests) are allocated to Arizona if the taxpayer's commercial domicile—defined as the principal place from which the trade or business is directed or managed—is in Arizona. Rents and royalties from real property are allocated to Arizona if the property is located in Arizona. Interest and dividends constituting nonbusiness income are allocated to Arizona if the taxpayer's commercial domicile is in Arizona.

Allocation is an all-or-nothing determination: if a gain from the sale of stock is nonbusiness income and the taxpayer's commercial domicile is in California, none of that gain is taxable by Arizona, even if the taxpayer has substantial Arizona operations. Conversely, if the commercial domicile is in Arizona, 100 percent of the nonbusiness capital gain is allocated to Arizona.

Application to common fact patterns

The Arizona Department of Revenue has issued corporate tax rulings addressing specific applications of the business vs. nonbusiness distinction:

• Gain on sale of partnership interest (CTR 94-3): If a corporation's distributive share of partnership income was business income and the partnership interest produced business income, the capital gain realized from selling the partnership interest is business income subject to apportionment. However, if the partnership interest produced nonbusiness income or the corporation's distributive share of the partnership's property was removed from the corporation's property factor for a substantial period (five years or more) before the sale, the capital gain is nonbusiness income allocated to the state of commercial domicile.

• Gain on sale of stock (CTR 00-1): Where gain or loss on the sale of stock arises from a subsidiary that is part of the taxpayer's unitary business, courts have generally held the gain or loss to be business income. For stock holdings outside a unitary relationship, the analysis turns on whether the investment served an operational purpose (making it business income) or a passive investment purpose (making it nonbusiness income).

Relationship to unitary business and apportionment

The business vs. nonbusiness income distinction is separate from, but interacts with, the unitary business determination. A corporation engaged in a multistate unitary business apportions its business income using a single apportionment formula that reflects the combined activities of the unitary group. Any nonbusiness income, however, is carved out and allocated separately before apportionment occurs. Even within a combined or consolidated return filing group, nonbusiness income is allocated according to the commercial domicile or situs rules rather than being included in the apportioned base.

Source: A.R.S. § 43-1131; A.R.S. § 43-1134; A.R.S. § 43-1136; A.R.S. § 43-1139; AZDOR Corporate Tax Ruling CTR 94-3; AZDOR Corporate Tax Ruling CTR 00-1

Arizona imposes civil penalties and interest on corporations that fail to timely file returns or pay tax. The penalties are calculated as percentages of the tax due and are imposed monthly. Interest accrues separately and compounds annually. The Department of Revenue may abate penalties when a taxpayer shows reasonable cause and absence of willful neglect.

Late filing penalty

Under A.R.S. § 42-1125(A), a corporation that fails to file a return on or before the due date or extended due date is subject to a penalty of 4.5% of the tax required to be shown on the return for each month or fraction of a month between the due date and the date the return is filed. The total late filing penalty cannot exceed 25% of the tax found to be remaining due. The penalty is reduced by any tax paid on or before the beginning of each month and by any credits claimed on the return.

If the corporation files under a valid extension and the return is filed by the extended due date, no late filing penalty is imposed, even if tax remains unpaid, provided the corporation paid at least 90% of the tax by the original due date. Arizona automatically extends the corporate income tax filing deadline to match the federal extension under I.R.C. provisions, without requiring a separate Arizona extension request, as long as the taxpayer has a valid federal extension.

Late payment penalty

A.R.S. § 42-1125(D) imposes a penalty when a corporation fails to pay the tax shown on the return within the time prescribed. The late payment penalty is 0.5% of the tax shown for each month or fraction of a month the failure continues, not to exceed a total of 10%. If the corporation is also subject to the late filing penalty for the same tax period, the combined late filing and late payment penalties cannot exceed 25% of the tax.

The Department will not impose the late payment penalty if it determines the failure to pay was due to reasonable cause and not willful neglect, and a payment agreement under A.R.S. § 42-2057 is appropriate—unless the taxpayer subsequently fails to comply with the payment agreement.

Extension underpayment penalty

When a corporation files under an extension but does not pay at least 90% of the tax liability by the original due date, an extension underpayment penalty applies to the shortfall. Arizona Department of Revenue Corporate Tax Ruling CTR 09-1 explains that this penalty applies in addition to late payment penalties when a corporation files timely under extension but fails to meet the 90% payment threshold. The extension underpayment penalty is calculated separately from the late payment penalty and applies from the original due date to the date the tax is actually paid.

Interest on unpaid tax

Arizona assesses interest on unpaid tax under A.R.S. § 42-1123. The interest rate is the federal short-term rate, determined under I.R.C. § 6621(b), plus three percentage points. Interest is compounded annually. The Department adds any outstanding interest as of January 1 of each year to the principal amount of tax, and that added interest becomes part of the principal for purposes of calculating subsequent interest.

Interest accrues from the original due date of the return (without regard to extensions) until the date the tax is paid. If a corporation obtains a filing extension, interest accrues on any unpaid balance from the original due date through the date of payment, even when the extended return is filed timely and no late filing penalty is imposed. Interest on a deficiency assessed by the Department accrues from the date prescribed for payment of the tax to the date the deficiency is assessed.

Penalty abatement for reasonable cause

A.R.S. § 42-2062 provides that the Department shall abate penalties imposed under A.R.S. §§ 42-1125, 42-1107, 43-581, or 43-582 upon written application by the taxpayer if the Department determines the conduct (or lack of conduct) causing the penalty was due to reasonable cause and not willful neglect. A taxpayer may request abatement after a penalty is assessed, or may request a waiver before an assessment is issued if the taxpayer is under audit.

For purposes of penalties imposed under A.R.S. § 42-1125, "reasonable cause" means the taxpayer exercised ordinary business care and prudence but was nevertheless unable to file the return, furnish the requested information, or provide for payment of the tax liability within the prescribed time. Arizona Department of Revenue General Tax Ruling GTR 04-2 provides examples of circumstances constituting reasonable cause, including unavoidable absence of the taxpayer, mathematical errors on a timely filed return, and delay caused by circumstances beyond the taxpayer's control. Reasonable cause is determined by the facts and circumstances of each case.

Penalty abatement is available for the late filing penalty (A.R.S. § 42-1125(A)), late payment penalty (A.R.S. § 42-1125(D)), extension underpayment penalty (A.R.S. § 42-1107), and underpayment of estimated tax penalty (A.R.S. § 42-1125(P)), among other penalties. Interest, however, generally may not be abated unless the interest resulted from an unreasonable error or delay by a Department employee under A.R.S. § 42-2065, or unless abatement is authorized under A.R.S. § 42-2052 for erroneous advice or misleading statements by the Department.

Additional penalties

Arizona imposes additional penalties for specific violations. A.R.S. § 42-1125(B) imposes a flat 25% penalty (in addition to the late filing penalty) when a taxpayer fails or refuses to file a return after notice and demand by the Department. A.R.S. § 42-1125(F) imposes a 10% penalty on deficiencies due to negligence without intent to defraud. A.R.S. § 42-1125(G) imposes a 50% penalty on any portion of a deficiency due to fraud with intent to evade tax.

Source: A.R.S. § 42-1125; A.R.S. § 42-1123; A.R.S. § 42-2062; AZDOR Corporate Tax Ruling CTR 09-1; AZDOR General Tax Ruling GTR 04-2