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Maine Individual Income Tax Filing deadlines and extensions for 2025.
If you are a tax professional working with clients who are residents or have been involved in significant business operations within Maine, then they might be required to file Maine State Taxes. This page covers the most important tax deadlines and tax extensions for Maine in 2025.
If your clients are residents or have been involved in significant business operations within Maine, then they might be required to file Maine State Taxes. This page outlines the most important tax deadlines and tax extensions for Maine in 2025.
Maine C Corporation Tax Deadlines for 2025
You must file and pay Corporate Income Taxes in Maine by April 15, 2026.
Extension to File Taxes in Maine for 2025
The Extension Deadline for Maine corporate income tax returns is October 15, 2026.
Maine automatically grants a six-month extension on filing corporate income tax returns. This means you do not need to file for an extension in Maine.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
Maine S Corporation & Partnership Tax Deadlines for 2025
You must file in Maine by March 16, 2026.
Extension to File S Corporation & Partnership Taxes in Maine for 2025
The Extension Deadline for Maine pass-through entity tax returns is September 15, 2026.
Maine 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 Maine.
This is an extension to FILE, not an extension to PAY – payment is still due March 15, 2026.
Estimated Tax Deadline for Maine 2025
Estimated tax payments are due:
See Form 1040ES-ME instructions for the amount to pay with each voucher.
Individual Tax Deadline for Maine 2025
You must file and pay Individual Income Taxes in Maine by April 15, 2026.
Extension to File Taxes in Maine for 2025
The Extension Deadline for Maine individual income tax returns is October 15, 2026.
Maine automatically grants a six-month extension on filing personal income taxes. This means you do not need to file for an extension in Maine.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
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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.
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