DOR Tax Due Dates and Extensions - Mass.gov
May 17, 2021 · File a 2020 calendar year return (Form 63-20P) and pay any tax, interest, and penalties due. This due date applies only if you have a valid extension of time to file the return. Otherwise, see April 15. Form 63-23P: Due on or before October 15, 2021 File a 2020 calendar year return (Form 63-23P) and pay any tax, interest, and penalties due.
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