Massachusetts State Tax Guide
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Massachusetts State Tax Guide
Extension rules
Extension type: Automatic State Extension · Form M-4868
Generally, you automatically get a 6-month extension to file your Massachusetts income tax return as long as you've paid at least 80% of the total amount of tax due on or before the due date
If you owe tax: Automatic unless you owe a tax liability then you must file form M-4868 along with your estimated tax payment by April 15th
If you owe $0: Automatic unless you owe a tax liability then you must file form M-4868 along with your estimated tax payment by April 15th
You must calculate what you owe and make a payment by April 15 so that your total year-to-date payments cover at least 80% of your total tax liability. If you fail to hit that 80% mark, your extension is voided entirely.
Massachusetts Key deadlines (tax year 2025, return filed in 2026)
- Filing deadline: Apr 15, 2026
- Extension request deadline: Apr 15, 2026 — Automatic unless you owe a tax liability then the deadline to file is April 15, 2026
- Extended return deadline: Oct 15, 2026 (6-month extension)
- Payment deadline: Apr 15, 2026
- Differs from federal: No
You must calculate what you owe and make a payment by April 15 so that your total year-to-date payments cover at least 80% of your total tax liability. If you fail to hit that 80% mark, your extension is voided entirely.
If the due date for filing your return falls on a Saturday, Sunday, or legal holiday, your return is due by the next regular working day.
October 15, 2026 (6-month extension)
Payment rules
You must calculate what you owe and make a payment by April 15 so that your total year-to-date payments cover at least 80% of your total tax liability. If you fail to hit that 80% mark, your extension is voided entirely.
Payment options
Payment plan availability
Available: Yes
Filing forms
Extension
- Form M-4868 - Form M-4868 · Download form
Massachusetts Refund Tracking
Do I need to file?
Automatic unless you owe a tax liability then you must file form M-4868 along with your estimated tax payment by April 15th
Filing methods
Online filing
Automatic unless you owe a tax liability then by mail or online : Massachusetts tax due dates and extensions
Mail filing
Automatic unless you owe a tax liability then by mail or online : Massachusetts tax due dates and extensions
