2025 Iowa State Tax Deadlines

Iowa Individual Income Tax Filing deadlines and extensions for 2025 for tax professionals.

As tax professionals serving clients in Iowa, it’s crucial to be aware of the state’s tax filing requirements and deadlines. This page outlines the key dates and information you need to ensure timely compliance for your Iowa-based clients in 2025.

2025 Iowa State Tax Deadlines

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

Iowa Business Tax Deadlines for 2025

C Corporation

Iowa C Corporation Tax Deadlines for 2025
You must file and pay Corporate Income Taxes in Iowa by April 30, 2026.

• File Online with the Iowa Department of Revenue or through approved software.
• File by Mail must be postmarked by the due date.
• Form IA 1120 – Iowa Corporation Income Tax Return

Extension to File Taxes in Iowa for 2025
The Extension Deadline for Iowa corporate tax returns is November 2, 2026.

Iowa automatically grants a six-month extension to file corporate income tax returns. This means you do not need to file for an extension in Iowa.

This is an extension to FILE, not an extension to PAY – payment is still due April 30, 2026.

Pass-Throughs

Iowa S Corporation & Partnership Tax Deadlines for 2025

You must file in Iowa by April 30, 2026.

• File Online with the Iowa Department of Revenue or through approved software.
• File by Mail must be postmarked by the due date.
• Forms:
  • IA 1120S – S-Corporation Income Tax Return
  • IA 1065 – Partnership Return of Income

Extension to File S Corporation & Partnership Taxes in Iowa for 2025

The Extension Deadline for Iowa S Corporation or Partnership tax returns is November 2, 2026.

Iowa automatically grants a six-month extension on filing pass-through entity tax returns. This means you do not need to file for an extension in Iowa.

This is an extension to FILE, not an extension to PAY – payment is still due April 30, 2026.

Iowa Individual Tax Deadlines for 2025

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

• April 30, 2025
• June 30, 2025
• September 30, 2025
• January 31, 2026

Individual Tax Deadline for Iowa 2025
You must file and pay Individual Income Taxes in Iowa by April 30, 2026.

• File Online with the Iowa Department of Revenue or through approved software.
• File by Mail must be postmarked by the due date.
• Forms:
  • IA 1040 – Residents
  • IA 1040A – Part-Year Residents and Nonresidents

Extension to File Taxes in Iowa for 2025
The Extension Deadline for Iowa individual income tax returns is November 2, 2026.

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

This is an extension to FILE, not an extension to PAY – payment is still due April 30, 2026.

Sources

• Iowa Department of Revenue – Individual Filing Information
• State of Iowa Taxes | Iowa Department of Revenue
• Iowa Department of Revenue – Due Dates

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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.