Alaska Tax Deadlines: Individual & Corporate Filing Guide

Alaska Tax Deadlines: Individual & Corporate Filing Guide

Check Alaska tax deadlines for individuals and C Corporations. Confirm due dates, extension rules, and exemptions for S Corps and Partnerships.

Alaska imposes no individual income tax, but business filings are still required.

Alaska Tax Deadlines at a Glance (2026)

Entity Type

Return Due

Notes

Individuals

N/A

No state income tax

C Corporations

May 15, 2026

30 days after federal

S Corporations

April 15, 2026

Informational

Partnerships

April 15, 2026

Informational

Businesses

Applies to corporations doing business or deriving income from Alaska.

Fiscal-Year Corporations

Due 30 days after federal corporate return, regardless of year-end.

Special Entities

  • Oil & gas companies

  • Financial institutions

  • Insurance companies

Estimated Payments

Required for corporations with expected tax liability.

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End-to-end Encryption

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Monitoring Systems

24/7 intrusion detection

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Multi‑Factor Authentication & Role‑based permissions

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Built on industry-leading standards to keep your clients’ data safe and your firm audit-ready.

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End-to-end Encryption

SOC 2 Type II

Monitoring Systems

24/7 intrusion detection
Quarterly scans & annual pen tests

Access Control

Multi‑Factor Authentication & Role‑based permissions

Regulation Compliant

TLS 256‑bit in transit & at rest
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Customer Stories

Trusted by firms across the board

"Research used to be a black hole. Now, I just type the question and get a citable IRS answer in seconds."

Tax Manager

Sama Tributa

"80% faster first drafts. What used to take us two days is now done in two hours."

Managing Partner

Northbridge Tax Advisory

Customer Stories

Trusted by firms across the board

"Research used to be a black hole. Now, I just type the question and get a citable IRS answer in seconds."

Tax Manager

Sama Tributa

"80% faster first drafts. What used to take us two days is now done in two hours."

Managing Partner

Northbridge Tax Advisory