Press Release  Massachusetts DOR Alerts Taxpayers: New Timelines for Mail Postmarking

BOSTON — The Massachusetts Department of Revenue (DOR) is warning taxpayers, preparers, and child support customers about recent changes to United States Postal Service procedures that could delay postmark dates for mail. As of December 2025, mail received at post offices may not be postmarked on the day of receipt, unless specifically requested at the retail counter. 

To avoid any mailed tax return delays, taxpayers are encouraged to file and make payments electronically. MassTaxConnect, DOR’s online system for filing returns and paying taxes, is available 24/7. 

Tax Year 2025 Massachusetts personal income tax returns are due by Wednesday, April 15, 2026.  Extension payments must also be made by that date to qualify for the extended filing deadline of Thursday, October 15, 2026. At least 80% of the tax due must be paid by April 15, 2026, to qualify for an extension.

For additional tax filing season resources and contact information, taxpayers are encouraged to visit the DOR website.  Additionally, child support customers can find contact information for Child Support Services.

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