2025 Louisiana State Tax Deadlines

Louisiana Individual Income Tax Filing deadlines and extensions for 2025 tax professionals to reference when working with clients in Louisiana.

If your client is a resident of Louisiana or has been involved in significant business operations within the state, they might be required to file Louisiana State Taxes. This document outlines the most important tax deadlines and tax extensions for Louisiana in 2025.

2025 Louisiana State Tax Deadlines

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

Louisiana Business Tax Deadlines for 2025

C Corporation

Louisiana C Corporation Tax Deadlines for 2025
You must file and pay Corporate Income Taxes in Louisiana by May 15, 2026.

• File Online with the Louisiana Department of Revenue
• File by Mail must be postmarked by the due date
• Form CIFT-620 – Louisiana Corporation Income and Franchise Tax Return

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

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

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

Pass-Throughs

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

• File Online with the Louisiana Department of Revenue
• File by Mail must be postmarked by the due date
• Forms:
  • IT-565 – Partnership Return of Income
  • CIFT-620 – S Corporation Income Tax Return

Extension to File S Corporation & Partnership Taxes in Louisiana for 2025
The Extension Deadline for Louisiana pass-through entity tax returns is November 15, 2026.

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

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

Louisiana Individual Tax Deadlines for 2025

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

• April 15, 2025
• June 16, 2025
• September 15, 2025
• January 15, 2026

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

• File Online with the Louisiana Department of Revenue
• File by Mail must be postmarked by the due date
• Forms:
  • IT-540 – Resident Return
  • IT-540B – Nonresident and Part-Year Resident Return

Extension to File Taxes in Louisiana for 2025
The Extension Deadline for Louisiana individual income tax returns is November 15, 2026.

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

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

Sources

• Louisiana Department of Revenue 
• Louisiana State Government Individual Filing Information
• Louisiana State Government Tax Forms

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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.