Massachusetts Tax Deadlines
State income tax filing deadlines, extensions, and estimates for 2026.
Massachusetts Department of Revenue
https://www.mass.gov/orgs/massachusetts-department-of-revenue
individual deadline
Due: Apr 15, 2026
Extension: Oct 15, 2026
Form: Form 1 / 1-NR/PY
MA extension requires payment of at least 80% of tax due.
Estimated Payments
Sole Proprietorship deadline
Due: Apr 15, 2026
Extension: Oct 15, 2026
Form: Form 1 / 1-NR/PY
Business income reported on MA personal return.
Estimated Payments
Partnership deadline
Due: Mar 16, 2026
Extension: Sep 15, 2026
Form: Form 3
MA partnerships receive an automatic 6-month extension.
S Corporation deadline
Due: Mar 16, 2026
Extension: Sep 15, 2026
Form: State S-corporation return
Calendar-year due date follows federal timing for pass-through entities.
C Corporation deadline
Due: Apr 15, 2026
Extension: Oct 15, 2026
Form: State C-corporation return
Calendar-year due date follows federal timing for corporations.
Estimated Payments
LLC deadline
Due: Mar 16, 2026
Extension: Sep 15, 2026
Form: State LLC return
Calendar-year due date follows federal timing for pass-through entities.
Nonprofit deadline
Due: May 15, 2026
Extension: Nov 15, 2026
Form: State nonprofit return
Nonprofit annual return generally due the 15th day of the 5th month.
Estimated Tax Payments
View all quarterly estimated payment due dates for Massachusetts.
FAQ
Does Massachusetts conform to federal due dates?
Many Massachusetts deadlines follow the federal calendar. Always confirm on Massachusetts Department of Revenue.
Where can I file Massachusetts tax forms?
Visit Massachusetts Department of Revenue at https://www.mass.gov/orgs/massachusetts-department-of-revenue for official forms and e-file options.