The Michigan Department of Treasury announced the annual interest rates for underpayments and overpayments from Jan. 1 to June 30, 2026. The daily interest rate of 0.0002324, based on an adjusted annual rate of 8.48 percent, will be added to tax deficiencies or excessive claims during this period. [Mich. Dep’t of Treasury, Revenue Administrative Bulletin 2025-13, 10/14/25]
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