The Massachusetts Department of Revenue (DOR) issued a Technical Information Release announcing the entire year 2025 interest rate on overpayment and underpayment of taxes. The full year rate for overpayments is 6 percent, and the full year rate for underpayments is 8 percent. [Mass. Dep’t of Revenue, Tech. Info. Release TIR 25-6, 09/12/25]
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