Alaska Business State Tax Extension | Fiduciaries Filing Guide

Form 8868  ·  Fiduciaries  ·  Business Filing Guide

Alaska fiduciaries—including estates and trusts—are subject to state fiduciary income tax requirements, administered by the Alaska Department of Revenue. Alaska grants an automatic extension tied to an approved IRS extension, making the process simple for filers who have already filed IRS Form 8868.

The original due date for the Alaska Fiduciaries return is March 15, 2026. File or remit full payment by this date to remain in good standing.

Alaska automatically grants an extension to file, provided you have obtained an approved federal extension from the IRS by filing IRS Form 8868. With a valid IRS extension, the Alaska extended deadline becomes September 15, 2026. No separate state extension form is required—the federal extension serves as your Alaska extension.

The extension applies to filing only—it is not an extension to pay taxes owed. Any outstanding tax liability must be paid by the original due date of March 15, 2026 to avoid penalties and interest. Use the Alaska | Online Tax Extension Payment to pay electronically, or mail your payment to: Tax Division Alaska Department of Revenue P.O. Box 110420 Juneau, AK 99811-0420

• Failure to File: 5% for each 30-day period or fraction thereof, up to 25% of unpaid tax.
• Failure to Pay: 5% for each 30-day period, not to exceed 25%.

• Estimate and pay your Alaska tax by March 15, 2026 to avoid interest and penalties.
• File IRS Form 8868 with the IRS to secure your federal extension, which Alaska automatically honors.
• Attach a copy of your federal extension to your Alaska return when filing.
• Set a reminder to file your completed Alaska Fiduciaries return by September 15, 2026.

Alaska’s extension for fiduciaries is straightforward once your federal extension is approved. Pay 100% of any tax due by March 15, 2026 and file your Fiduciaries return by September 15, 2026.

Business tax returns are complex—a licensed CPA or Enrolled Agent can maximize deductions, ensure accurate calculations, and handle filing on your behalf. Here's how working with a TaxPro typically goes:

1. 1Get matched with a verified U.S.-based CPA or Enrolled Agent
2. 2Upload your business documents via secure drag-and-drop
3. 3Review and approve your return with upfront, transparent fees
4. 4Your TaxPro files your Alaska return by September 15, 2026

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