08/21/2026
For individuals, the rate for overpayments and underpayments will be 7% per year, compounded daily. Here is a complete list of the new rates:
7% for overpayments (payments made in excess of the amount owed), 6% for corporations.
4.5% for the portion of a corporate overpayment exceeding $10,000.
7% for underpayments (taxes owed but not fully paid).
9% for large corporate underpayments.