Irs Interest Rates 2024 Payment. Interest on irs payment plans and tax underpayments. For the first three quarters of 2024, the irs interest rate on underpayments for individuals is set at 8%.

For taxpayers other than corporations, the overpayment and underpayment rate is the federal. 8% for overpayments (7% for corporations) 8% for the underpayment of taxes.