Alaska — Corporate Income / Franchise Tax

Alaska imposes a corporate income tax on the taxable income of every corporation derived from sources within the state under AS 43.20.011(e). The tax applies to C corporations only; pass-through entities (S corporations, partnerships, LLCs taxed as partnerships) are not subject to Alaska corporate income tax because their income and losses flow through to individual owners' tax returns, and Alaska repealed its individual income tax in 1980. The tax is computed on a graduated rate structure ranging from 0% on the first $25,000 of taxable income to a top marginal rate of 9.4% on income over $222,000.

Certain small corporations meeting specific qualification requirements under AS 43.20.012 may be exempt from the tax. Alaska does not impose a separate corporate franchise tax.

Source: Alaska Legislative Research Services, LRS 25-164 (March 2025)

Alaska corporate income tax returns are due within 30 days after the federal corporate return is required to be filed under AS 43.20.030(a). For most calendar-year C corporations, this means the Alaska return is due May 15 (30 days after the April 15 federal due date). Corporations filing on a fiscal-year basis must file their Alaska return 30 days after their federal due date.

Federal extensions automatically extend the Alaska filing deadline to 30 days after the extended federal due date. When a corporation obtains an extension for its federal return, Alaska allows the same extension period plus the additional 30 days, so no separate Alaska extension application is required.

The statute applies to corporations and to partnerships that have a corporation as a partner. The 30-day deadline is measured from the date the federal return is "required to be filed," meaning the original federal due date (or extended due date if an extension was granted), not the date the taxpayer actually files the federal return.

Source: AS 43.20.030(a), Alaska Legislative Research Services LRS 25-164 (March 2025)

Alaska's corporate income tax uses ten graduated brackets ranging from 0% to 9.4%, in effect since 1981. The first $25,000 of taxable income is taxed at 0%. Rates then increase in increments: 2% on income between $25,000 and $49,000; 3% on income between $49,000 and $74,000; 4% on income between $74,000 and $99,000; 5% on income between $99,000 and $124,000; 6% on income between $124,000 and $149,000; 7% on income between $149,000 and $174,000; 8% on income between $174,000 and $199,000; 9% on income between $199,000 and $222,000; and 9.4% on income over $222,000.

Source: AS 43.20.011(e)

Multistate corporations doing business both inside and outside Alaska apportion their total income to the state using an equally weighted three-factor formula based on the Multistate Tax Compact, codified at AS 43.19.010. The apportionment percentage is the average of three ratios: (1) Alaska property to total property, (2) Alaska payroll to total payroll, and (3) Alaska sales to total sales. Each factor receives equal one-third weighting. Oil and gas producers and pipeline transporters use modified apportionment formulas under separate statutory provisions.

Source: Alaska Legislative Research Services, LRS 25-164 (March 2025)

Alaska imposes corporate income tax on C corporations doing business in the state, but Alaska statutes do not codify bright-line nexus standards comparable to the economic nexus thresholds many states adopted after South Dakota v. Wayfair (2018). Practitioners must instead rely on the statutory language taxing income "derived from sources within the state," constitutional nexus principles, and the absence of Alaska administrative guidance defining what constitutes sufficient connection to trigger filing obligations.

## Statutory foundation: income derived from sources within the state

AS 43.20.011(e) imposes Alaska corporate income tax "upon the entire taxable income of every corporation derived from sources within the state." The statute does not define what connection or presence is required for a corporation to be considered subject to the tax. The imposition language presupposes that nexus exists but does not specify the activities or thresholds that create it.

Alaska Statutes Title 43, Chapter 19 (allocation and apportionment) and Chapter 20 (the Alaska Net Income Tax Act) contain no section titled "nexus" and no enumeration of nexus-creating activities or safe harbors. Legislative fiscal analyses describe the tax as applying to "C-Corporations doing business in the state of Alaska" without further statutory definition of that phrase.

This statutory silence leaves Alaska corporate income tax nexus determinations governed by general constitutional nexus principles—substantial connection to the state sufficient to satisfy due process and Commerce Clause requirements—without state-specific administrative elaboration.

## Physical presence and apportionment factors

Because Alaska uses a three-factor apportionment formula under AS 43.19.010 (property, payroll, and sales), corporations subject to Alaska corporate income tax typically have property or payroll presence in the state. However, the apportionment statute does not itself create or define nexus; it describes how income is apportioned for corporations already determined to be subject to Alaska tax.

In practice, corporations with employees, offices, facilities, inventory, or other physical presence in Alaska are treated as having nexus. Alaska has not enacted legislation establishing economic nexus for corporate income tax based solely on sales volume or transaction count, distinguishing its approach from the remote-seller frameworks many states adopted for sales tax and corporate income tax post-Wayfair.

The scope of activities that create nexus for a corporation with no employees or tangible property in Alaska—such as remote sales facilitated through digital advertising or cloud infrastructure hosted in Alaska—is not addressed by published Alaska Department of Revenue guidance.

## Public Law 86-272 federal protections

Public Law 86-272 (15 U.S.C. §§ 381–384) prohibits a state from imposing a net income tax on an out-of-state corporation whose only in-state activity is the solicitation of orders for sales of tangible personal property, where orders are approved and filled from outside the state. Alaska, like all states, is bound by this federal limitation.

Corporations whose Alaska activities exceed mere solicitation—by installing products, maintaining inventory, providing post-sale services, or performing other in-state functions—may lose P.L. 86-272 protection and thereby create nexus. The Multistate Tax Commission issued revised guidance on P.L. 86-272 in October 2021 detailing protected and unprotected activities, but Alaska has not formally adopted or rejected that guidance, and there is no Alaska administrative position interpreting P.L. 86-272 for Alaska corporate income tax purposes.

## No economic nexus threshold

As of 2026, Alaska has not enacted a corporate income tax economic nexus threshold (such as $100,000 in Alaska sales or 200 transactions). Legislative proposals such as SB 122 in the 33rd Legislature (2023–2024) focused on changing Alaska's apportionment methodology—adopting market-based sourcing and moving certain industries to single-sales-factor apportionment—but did not establish economic nexus standards for remote sellers.

Alaska does not impose a statewide sales tax, so there is no state-level remote-seller sales tax nexus issue. Local jurisdictions that levy sales taxes set their own nexus and collection standards.

## Qualified gas project exception

AS 43.20.145(g) provides a narrow statutory exception to the filing requirement for certain corporations with nexus. A corporation that has signed a legislatively approved contract under AS 43.82 (the Alaska Stranded Gas Development Act) providing for payments in lieu of corporate income tax, and that has nexus with Alaska solely because of its participation in the approved qualified project, is not required to file a corporate income tax return unless the contract requires it. This provision confirms that Alaska law contemplates nexus as a prerequisite to taxation but grants relief for strategically designated projects.

## Practical effect: limited published guidance

Alaska Department of Revenue has not published detailed bulletins, advisories, taxability matrices, or letter rulings clarifying corporate income tax nexus standards. Practitioners face open questions about what level of activity creates nexus for corporations with no employees or tangible property in Alaska—questions common in the digital economy involving telecommuting employees, independent contractors, digital advertising targeted to Alaska residents, or internet sales with no Alaska fulfillment infrastructure.

In the absence of codified nexus thresholds or administrative guidance, corporate income tax nexus determinations in Alaska rest on constitutional principles and the general "doing business" concept. Corporations with physical presence in Alaska—employees, offices, inventory, equipment—are treated as having nexus. The treatment of remote corporations with only sales into Alaska is not addressed by Alaska statute or published administrative authority.

Source: AS 43.20.011(e), Alaska Legislative Research Services LRS 25-164 (March 2025) Source: AS 43.20.145(g), SB 92, 34th Alaska Legislature (2025) Source: SB 122 Fiscal Note, 33rd Alaska Legislature (2023)

Alaska corporate income tax is calculated on a corporation's taxable income, which begins with federal taxable income and is then subject to Alaska-specific modifications. This starting-point rule is foundational to computing Alaska corporate tax liability.

## Adoption of the Internal Revenue Code

Alaska adopts substantial portions of the Internal Revenue Code by reference under AS 43.20.021. Sections 26 U.S.C. 1–1399 and 6001–7872 of the Internal Revenue Code, as amended, have full force and effect under Alaska's corporate income tax unless excepted to or modified by other Alaska statutory provisions. This means that Alaska generally follows federal rules for determining gross income, allowable deductions, accounting methods, taxable years, and most other computational mechanics.

## Federal taxable income as the base

For corporations subject to Alaska corporate income tax, taxable income is the company's federal taxable income—federal gross income minus allowable federal deductions—with certain Alaska-specific modifications. The federal taxable income figure shown on the corporation's Form 1120 (federal corporate income tax return) serves as the baseline for the Alaska computation.

Alaska does not independently define "gross income" or enumerate a separate list of allowable deductions. Instead, the state incorporates the federal definitions and then layers on state-specific adjustments through other provisions in AS 43.20.

## Alaska modifications to federal taxable income

While AS 43.20.021 adopts federal taxable income as the starting point, Alaska statutes and regulations impose modifications. Common categories of modification include:

• State-specific credits and deductions: Alaska allows certain credits (such as the income tax education credit under AS 43.20.014 and special industrial incentive investment tax credits under AS 43.20.042) that do not exist at the federal level or that are computed differently.
• Federal credits limited to 18 percent: Where a federal tax credit is also allowed for Alaska corporate income tax purposes, AS 43.20.021(d) limits the Alaska credit to 18 percent of the federal credit amount attributable to Alaska.
• Alaska-specific rate adjustments: For example, the alternative minimum tax rate for Alaska corporations is 18 percent of the applicable federal alternative minimum tax (AS 43.20.021(f)), and the accumulated earnings tax is calculated at Alaska-specific rates (4.95 percent on the first $100,000 and 6.93 percent on amounts over $100,000 under AS 43.20.021(g)).
• Exclusions and additions: Certain Alaska-specific provisions may require additions to or subtractions from federal taxable income, such as adjustments related to water's-edge combined reporting elections under AS 43.20.145 or deductions of Alaska net operating losses that differ from federal treatment.

Practitioners should carefully review both the federal return and Alaska-specific statutory provisions to identify all applicable modifications. The Alaska Department of Revenue's corporate income tax forms and instructions enumerate the required adjustments in the order they must be applied.

## Interaction with apportionment

For multistate corporations, the taxable income figure (after Alaska modifications) is then apportioned to Alaska using the three-factor formula under AS 43.19.010. The apportioned Alaska income is the amount subject to Alaska's graduated rate structure under AS 43.20.011(e). Only corporations doing business solely within Alaska use their entire taxable income without apportionment.

## Why this matters

Understanding that Alaska starts with federal taxable income and then applies modifications is critical for:

• Return preparation: Practitioners must first complete the federal Form 1120 (or consolidated return) before they can determine Alaska taxable income.
• Audit planning: Adjustments to the federal return (whether by the IRS or by amended filing) generally flow through to Alaska. AS 43.20.030(i) requires taxpayers to file an amended Alaska return within 60 days of any final federal determination that changes federal taxable income.
• State-specific planning: Certain transactions that are neutral or favorable at the federal level may create Alaska-specific additions, and vice versa. Practitioners advising multistate corporations should model the Alaska modifications separately.

The Alaska Legislature has periodically enacted conformity updates or decoupling provisions (for example, the state's treatment of certain federal Tax Cuts and Jobs Act provisions), so practitioners should confirm that Alaska has adopted the version of the Internal Revenue Code in effect for the tax year in question.

Source: Alaska Legislative Research Services, LRS 25-164 (March 2025)

Alaska provided a temporary corporate income tax exemption for certain small corporations from 2013 through June 30, 2023. The exemption sunset on July 1, 2023, and qualifying small corporations are once again subject to Alaska corporate income tax.

## Exemption in effect from 2013 through June 30, 2023

Chapter 55, Session Laws of Alaska 2013 (Senate CS for CS for House Bill No. 252) added a qualified-small-business exemption to AS 43.20.012(a)(3). For tax years beginning after December 31, 2012, and before July 1, 2023, the Alaska corporate income tax did not apply to an Alaska corporation that was a "qualified small business" and that met the active business requirement in 26 U.S.C. § 1202(e) as that subsection read on January 1, 2012.

The exemption was enacted with a built-in sunset. Section 3 of HB 252 provided that AS 43.20.012 would be repealed and reenacted without the small-business exemption effective July 1, 2023. That sunset took effect as scheduled, removing the exemption for tax years beginning on or after July 1, 2023.

## Qualification requirements under former AS 43.20.012 (for historical reference)

During the period the exemption was in effect, a corporation qualified if it met four requirements:

1. Alaska corporation The corporation must have been incorporated in Alaska or authorized to do business in Alaska under AS 43.20.012(d)(1) (formerly (c)(1) or (e)(1), depending on the year).

2. Qualified small business under 26 U.S.C. § 1202 "Qualified small business" had the meaning given in 26 U.S.C. § 1202 as that section read on January 1, 2012. Under that federal provision, a qualified small business stock is stock in a C corporation that meets certain requirements, including that the corporation's gross assets did not exceed $50 million at the time of stock issuance and immediately thereafter. Alaska adopted the federal definition by reference but froze the reference date at January 1, 2012, meaning later amendments to 26 U.S.C. § 1202 did not automatically flow through to Alaska's exemption.

3. Active business requirement under 26 U.S.C. § 1202(e) The corporation must have satisfied the active business requirement set forth in 26 U.S.C. § 1202(e) as that subsection read on January 1, 2012. That subsection requires, among other things, that the corporation use at least 80 percent (by value) of its assets in the active conduct of one or more qualified trades or businesses.

4. Excluded industries Alaska excluded four industries from the definition of "qualified small business" even if they met the federal requirements under 26 U.S.C. § 1202. Under AS 43.20.012(d)(3) (formerly (c)(3) or (e)(3)), "qualified small business" did not include a construction, transportation, utility, or fisheries business.

## Parent-subsidiary controlled group aggregation

For purposes of determining whether a corporation qualified for the exemption, all corporations that were members of the same parent-subsidiary controlled group were treated as one corporation. "Parent-subsidiary controlled group" had the meaning given in 26 U.S.C. § 1202 as that section read on January 1, 2012. Whether a corporation qualified was determined on the first day of the tax year for which the corporation claimed the exemption.

## Current status: no small corporation exemption

As of July 1, 2023, AS 43.20.012 no longer includes the small-corporation exemption. The statute now provides that Alaska corporate income tax does not apply to individuals, fiduciaries, certain nonprofit fishery and aquaculture associations, and nonprofit shellfish permit holders, but does not exempt small C corporations. All C corporations doing business in Alaska and deriving income from sources within Alaska are subject to Alaska corporate income tax under AS 43.20.011(e) unless another exemption applies.

Corporations that qualified for the exemption during tax years 2013 through the first half of 2023 may still claim the exemption for those historical periods, but no corporation may claim the exemption for a tax year beginning on or after July 1, 2023.

Source: Senate CS for CS for House Bill No. 252 (27th Legislature, 2011–2012)

Alaska corporations subject to corporate income tax are required to make estimated tax payments following the same schedule and rules that apply to federal corporate estimated taxes under the Internal Revenue Code. Alaska has no separate state-specific estimated tax payment schedule, safe harbor rules, or penalty calculation—the state adopts the federal framework by reference.

## Payment timing: same as federal

AS 43.20.030(c) provides that "the total amount of tax imposed by this chapter is due and payable to the department at the same time and in the same manner as the tax payable to the United States Internal Revenue Service." This language governs both final tax payments and estimated tax installments.

Because Alaska requires payment "at the same time and in the same manner" as federal payments, corporations must make Alaska estimated tax payments on the same quarterly deadlines as their federal estimated tax payments under IRC § 6655. For calendar-year corporations, the four quarterly estimated tax installment due dates are:

• April 15 (1st quarter)
• June 15 (2nd quarter)
• September 15 (3rd quarter)
• December 15 (4th quarter)

Fiscal-year corporations follow the corresponding dates based on their fiscal year under the federal rules.

## Federal safe harbors apply by reference

Alaska adopts IRC §§ 1–1399 and 6001–7872 by reference under AS 43.20.021. Consequently, the federal safe harbor rules for avoiding estimated tax underpayment penalties in IRC § 6655(d) apply for Alaska purposes as well.

A corporation can avoid Alaska estimated tax penalties if its quarterly payments equal or exceed the lesser of:

1. 100% of the prior year's tax liability (if the corporation filed an Alaska return for the prior year and that year was a full 12 months), or
2. 100% of the current year's tax liability computed on an annualized income basis for the months in the installment period.

Large corporations (those with taxable income of $1 million or more in any of the three preceding years) cannot use the prior-year safe harbor for installments after the first quarter under IRC § 6655(d)(2), as incorporated by Alaska law. Alaska applies this federal limitation in the same manner as the IRS.

## Underpayment penalty calculation

Alaska imposes an underpayment penalty using the same methodology as IRC § 6655. The penalty is calculated as interest on the underpayment for the period between the installment due date and the earlier of the actual payment date or the return due date.

The interest rate for Alaska corporate tax underpayments is set by the Department of Revenue. Alaska does not use the federal underpayment interest rate; the state sets its own rate, but the calculation method—measuring the underpayment amount and the number of days late—follows IRC § 6655.

Corporations that underpay Alaska estimated taxes must complete Alaska Form 0405-708, Underpayment of Estimated Tax by Corporations, and attach it to their Alaska corporate income tax return (Form 0405-611). The form applies the IRC § 6655 framework to compute the penalty amount.

## Practical application

Alaska corporations should:

• Calculate both their federal and Alaska estimated tax liability each quarter.
• Make Alaska estimated payments on the same quarterly schedule as federal payments (April 15, June 15, September 15, and December 15 for calendar-year corporations).
• Apply the federal safe harbor tests under IRC § 6655(d) to determine the minimum required payment for each quarter.
• Use the same annualized income method, if elected for federal purposes, when computing Alaska installments.
• Complete Form 0405-708 if an underpayment occurs and attach it to the annual Alaska return.

Because Alaska corporate tax is imposed on Alaska-apportioned income and computed at Alaska's graduated rate structure (AS 43.20.011(e)), the dollar amount of Alaska estimated tax will differ from the federal amount. However, the timing, safe harbor tests, and penalty calculation method are identical to the federal rules.

Source: AS 43.20.030(c), Alaska State Legislature Source: AS 43.20.021, Alaska Legislative Research Services LRS 25-164 (March 2025)