The New Hampshire Department of Revenue (DOR) issued a technical information release providing the annual interest rates for calendar year 2026. The release establishes an underpayment interest rate of 9 percent and an overpayment interest rate of 6 percent for taxes administered by the Department, effective Jan. 1, 2026, through Dec. 31, 2026. [N.H. Dep’t of Revenue, Tech. Info. Release, No. 2025-004, 09/02/25]
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