IRS Penalty Calculator

The IRS charges separate penalties for filing late and paying late, plus compounding interest. This tool calculates your total exposure based on your unpaid balance, the original due date, and when you expect to file and pay. Use it to decide whether to rush a payment or negotiate an installment agreement.

Tax Owed (unpaid balance) ($)

Original Due Date

Payment / Filing Date

Did You File an Extension?

IRS Interest Rate (current: 7%)

Days Late (filing)

Months Late (filing penalty)

Failure-to-File Penalty (5%/mo, max 25%)

Failure-to-Pay Penalty (0.5%/mo, max 25%)

Interest on Unpaid Tax

Original Tax Owed

Total Amount Due