2025 Alabama State Tax Deadlines

Alabama Individual Income Tax Filing deadlines and extensions for 2025.

If your clients  are residents or have been involved in significant business operations within Alabama, then they might be required to file Alabama State Taxes. This page covers the most important tax deadlines and tax extensions for Alabama in 2025.

2025 Alabama State Tax Deadlines

Alabama Individual Income Tax Filing deadlines and extensions for 2025.

If your clients  are residents or have been involved in significant business operations within Alabama, then they might be required to file Alabama State Taxes. This page covers the most important tax deadlines and tax extensions for Alabama in 2025.

Alabama Business Tax Deadlines for 2025

C Corporation

Alabama C Corporation Tax Deadlines for 2025 

You must file and pay Corporate Income Taxes in Alabama by May 15, 2026.

• File Online with My Alabama Taxes
• File by Mail must be postmarked by the due date
• Form: Alabama 20C – Alabama Corporation Income Tax Return

Extension to File C Corporation Taxes in Alabama for 2025
The Extension Deadline for Alabama corporate income tax returns is November 15, 2026.

If an extension has been granted for federal purposes, the extension is also granted for Alabama purposes; the Federal Form 7004 must be submitted with the Form 20C or Form 20C-C.

This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.

Pass-Throughs

Alabama S Corporation & Partnership Tax Deadlines for 2025
You must file in Alabama by April 15, 2026.

• File Online with My Alabama Taxes
• File by Mail must be postmarked by the due date
• Forms:
  • Form 20S – S-Corporation Information/Tax Return
  • Form 65 – Partnership/Limited Liability Company Return of Income
  • Form PPT – Alabama Business Privilege Tax Return

Extension to File S Corporation & Partnership Taxes in Alabama for 2025
The Extension Deadline for Alabama S Corporation and Partnership returns is October 15, 2026.

If an extension has been granted for federal purposes, the extension is also granted for Alabama purposes; the Federal Form 7004 must be submitted with the Form ET-1.

This is an extension to FILE, not an extension to PAY – payment is still due March 15, 2026.

Alabama Individual Tax Deadlines for 2025

Estimated Tax Deadline for Alabama 2025
Estimated tax payments are due:

• April 15, 2025
• June 15, 2025
• September 15, 2025
• January 15, 2026

See Form 40ES instructions for the amount to pay with each voucher.

Individual Tax Deadline for Alabama 2025
You must file and pay Individual Income Taxes in Alabama by April 15, 2026.

• File Online with My Alabama Taxes
• File by Mail must be postmarked by the due date
• Applicable forms:
  • Form 40 – Residents & Part-Year Residents
  • Form 40A – Full-Year Residents
  • Form 40NR – Nonresidents

Extension to File Taxes in Alabama for 2025
The Extension Deadline for Alabama individual tax returns is October 15, 2026.

Alabama automatically grants a six-month extension on filing personal income taxes. This means you do not need to file for an extension in Alabama.

This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.

Sources

• Alabama Department of Revenue – Individual Income Tax
• Alabama Department of Revenue – Corporate Income Tax
• Alabama Department of Revenue – Tax Forms
• Original Due Date Domestic C corporation
• Alabama Department of Revenue – Due Date Calendar

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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.