Irs Interest Rates 2024 Calculator. The easiest, most accurate, most advanced, irs penalty & interest calculator available with an accuracy guarantee. The irs interest rate on unpaid taxes and tax refunds for individuals is 8% for the first three quarters of 2024 (the rate is adjusted on a quarterly basis).
Feel confident with our free tax calculator that’s up to date on the latest tax laws. Paycalc calculates the amounts of backpay including interest that are due aggrieved individuals when you supply the pay they should have earned and the pay they did in.