Alaska Corporate Income Tax: Rates, Who Pays and Filing Deadlines
Alaska Corporate Income Tax: Rates, Who Pays and Filing Deadlines
Alaska's corporate income tax applies to corporations and to LLCs that elect corporate tax treatment. The rate is graduated from 0% to 9.4%, and the Alaska Department of Revenue, Tax Division administers it. This guide covers the alaska corporate income tax rate schedule, who pays, how taxable income is measured, and the deadlines that catch new owners.
Informational content, not legal or tax advice. This guide summarizes publicly available rules as of the research date. Tax rules change, and your filing depends on your entity type, where you operate, and your income. Confirm current requirements with the Tax Division and work with a qualified CPA or attorney before you file, especially if you operate in several states or run an oil and gas business.
The Alaska Corporate Tax Rate at a Glance
The alaska corporate income tax rate is graduated, so the rate climbs as taxable income rises. It starts at 0% and reaches 9.4% at the top, moving in steps of $24,000 or $25,000 of taxable income. Two numbers matter most:
| Alaska taxable income | Rate |
|---|---|
| $25,000 and below | 0% |
| Between $25,000 and $222,000 | Graduated steps |
| $222,000 and over | 9.4% |
A corporation with $25,000 or less of Alaska taxable income owes no Alaska corporate income tax. Once taxable income reaches $222,000, the top 9.4% rate applies. Between those points, the bracket table determines the tax on each slice of income. The Tax Division publishes that table with its corporate forms, so pull the current version before you estimate a payment. A single average rate will not match the return.
Where Taxable Income Starts
Alaska taxable income starts with federal taxable income and then applies Alaska adjustments. Your federal return is the starting point, not the final number. Adjustments can add or remove items, and the Alaska return is where they are reported. Keep federal workpapers organized so each adjustment can be traced back to its source.
Who Pays the Alaska Corporate Income Tax
The tax reaches four groups of owners, and each one follows different rules:
- Corporations. A corporation reports Alaska taxable income and pays the graduated tax under the schedule above.
- LLCs that elect corporate taxation. These LLCs file the Alaska corporate net income tax on the same schedule as a corporation.
- LLCs and partnerships taxed as partnerships. These entities owe no Alaska income tax on their earnings. They may still have a filing obligation, and a partnership return is required unless all partners are natural persons.
- Sole proprietors. Alaska has no personal state income tax, so business earnings reported on an owner's personal return are not subject to an Alaska income tax.
Confirm your entity's federal tax classification before you decide which Alaska return applies. A mismatch here sends owners to the wrong form.
How Multistate Corporations Split Their Income
A corporation with activity in more than one state does not pay Alaska tax on all of its income. Alaska apportions income for multistate corporations on a water's edge basis, using property, payroll and sales. The three factors determine the share of income that Alaska can tax. Confirm with the Tax Division or a CPA how your corporate group is defined under the water's edge rules before you run the numbers.
Oil and gas corporations are the exception. They use a modified formula applied to worldwide income. If your business is in oil and gas, do not apply the general formula until a CPA has confirmed the method.
Alaska Corporate Tax Filing Deadlines
Alaska runs two separate deadlines on different clocks. Only the return can be extended, and the payment cannot.
The Payment Deadline
Payment is due on or before the 15th day of the fourth month after the close of the tax year, and it cannot be extended. For a calendar-year corporation, that date is April 15.
The Return Deadline
The Alaska return is due 30 days after the federal due date. For a calendar-year corporation whose federal return is due April 15, the Alaska return is due May 15. If the federal return is on extension, the Alaska return is automatically extended as well.
Because the payment cannot be extended, an extension of the return does not move the payment date. Estimate the tax and pay by April 15 even if you plan to file the return later.
| Item (calendar-year corporation) | Date |
|---|---|
| Alaska corporate tax payment | April 15 (cannot be extended) |
| Alaska corporate income tax return | May 15 (30 days after the April 15 federal due date) |
Large Payments Must Go Electronic
Payments of $100,000 or more (estimated) or $150,000 or more (with a return) must be made online or by wire. Set up your payment method before the due date so the requirement does not surprise you at the bank.
The Small Corporation Exemption
Alaska once exempted small corporations from the corporate income tax. That exemption sunset on July 1, 2023. A bill to restore it, HB 113 of 2025, was still in committee and was not law as of 2026. Do not assume the exemption applies to you. Check the Tax Division for any change before you skip a filing or estimate a zero liability.
Costs That Are Not Income Tax
The corporate income tax is one line in your budget. Keep these other obligations separate:
- Biennial Report. Corporations and LLCs pay a $100 Biennial Report fee to the Corporations Section, not to the Tax Division. The report is due January 2 every two years, and late penalties apply after February 1. Entities formed in an even-numbered year report in even-numbered years, and odd-year formations report in odd years. A no-fee Initial Report is due within 6 months of formation. Confirm the current fee on the Corporations page before you pay, because some published references list a different amount.
- Alaska business license. Before you do business in Alaska, you need a state business license under AS 43.70 from the Division of Corporations, Business and Professional Licensing. It costs $50 per year for a new application and $50 per year to renew. The only endorsement is the tobacco endorsement, at $100 per location. This license is separate from forming the entity with the Corporations Section.
- Personal and sales taxes. Alaska has no personal state income tax and no statewide sales tax. The Tax Division's tax types page does not list a franchise tax.
- Local sales tax. Alaska has no statewide sales tax, but 107 reporting municipalities levy local sales taxes ranging from 1% to 7%, typically 2% to 5%. Whether a sale is taxed depends on the city or borough where it takes place, so check the rules for each place where you sell.
- Bed tax. Many cities and boroughs levy a bed tax on lodging. A business that rents rooms needs the rule for each specific place it operates.
- Local general business license. Cities set their own rules. Some require a general business license, while Anchorage, Ketchikan and Homer do not. Check each city where you operate.
Steps to Stay Compliant
- Confirm your entity's federal classification: corporation, LLC electing corporate treatment, or partnership.
- Pull federal taxable income and list each Alaska adjustment.
- If you operate in several states, compute apportionment using property, payroll and sales, or the oil and gas formula if it applies.
- Calendar April 15 for payment and May 15 for the return if you are a calendar-year corporation, and confirm both against the federal due dates that apply to you.
- Pay online or by wire if your payment reaches $100,000 estimated or $150,000 with a return.
- Check the Tax Division for the current status of the small corporation exemption.
- File the Biennial Report with the Corporations Section by January 2 of each report year, and keep it separate from your tax return.
Where to Verify Current Rules
- Alaska Department of Revenue, Tax Division: https://tax.alaska.gov/
- Division of Corporations, Business and Professional Licensing: https://www.commerce.alaska.gov/web/cbpl/Corporations
- Alaska business entity search: https://www.commerce.alaska.gov/cbp/main/search/entities
- Alaska Small Business Development Center: https://aksbdc.org/
When to Bring In a Professional
Talk to a CPA before your first Alaska return if you have multistate income, an oil and gas business, a recent change in entity type, or a question about the small corporation exemption. An attorney can advise on entity structure. A review before the first return costs less than fixing a missed payment that cannot be extended.