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Massachusetts Individual Income Tax Filing deadlines and extensions for 2025 tax professionals.
As tax professionals serving clients in Massachusetts, it’s crucial to be aware of the state’s tax filing deadlines and extensions to ensure timely compliance and avoid potential penalties. This guide provides an overview of the key dates for the 2025 tax year.
If your clients are residents or have been involved in significant business operations within Massachusetts, they might be required to file Massachusetts State Taxes. This guide covers the most important tax deadlines and tax extensions for Massachusetts in 2025.
Massachusetts C Corporation Tax Deadlines for 2025
You must file and pay Corporate Excise Taxes in Massachusetts by April 15, 2026.
Extension to File Taxes in Massachusetts for 2025
The Extension Deadline for Massachusetts corporate excise tax returns is November 15, 2026.
Massachusetts automatically grants a six-month extension on filing corporate excise tax returns. This means you do not need to file for an extension in Massachusetts.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
Massachusetts S Corporation & Partnership Tax Deadlines for 2025
You must file in Massachusetts by March 15, 2026.
Extension to File S Corporation & Partnership Taxes in Massachusetts for 2025
The Extension Deadline for Massachusetts S Corporation or Partnership tax returns is September 15, 2026.
Massachusetts 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 Massachusetts.
This is an extension to FILE, not an extension to PAY – payment is still due March 15, 2026.
Estimated Tax Deadline for Massachusetts 2025
Estimated tax payments are due:
See Form 1-ES instructions for the amount to pay with each voucher.
Individual Tax Deadline for Massachusetts 2025
You must file and pay Individual Income Taxes in Massachusetts by April 15, 2026.
Extension to File Taxes in Massachusetts for 2025
The Extension Deadline for Massachusetts individual income tax returns is October 15, 2026.
Massachusetts automatically grants a six-month extension on filing personal income taxes. This means you do not need to file for an extension in Massachusetts.
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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