IRS Penalty and Interest Calculator
For income tax, the IRS charges penalties both for filing late and for paying late.
They also charge interest on both the principal and those penalties, compounded daily, and their interest rate can change as often as four times per year.
All of this can make it confusing to know how much you are actually going to pay in penalties and interest.
Our calculator is meant to give you a rough idea of the amount of penalty and interest that the IRS will charge you. It's not exact, but it's awful close.
For the "amount owed", you should enter the amount that your tax return originally said that you owed (before any penalty or interest calculations).
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