IRS Penalty & Interest Calculator

Not tax advice. Estimates only — see full disclaimer.

Penalties

Failure to File

Failure to Pay

Accuracy-Related

Tax yearTaxpayer type

Tax owed on the return

$

Help me estimate my tax owed →Did you file an extension?Extension moves filing to October 15. Payment still due April 15.

Payment dueApril 15, 2025

Filing dueApril 15, 2025

When was the return filed?Payoff dateRunning total through this date

Free calculations left

3

Each Calculate uses 1 of 3 free runs.

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TaxPenalty.app

Clear IRS penalty and interest estimates — built for taxpayers and tax professionals.

TaxPenalty.app provides estimates only and is not tax, legal, or accounting advice. Results are approximations based on published IRS rules and rates and may not match an IRS assessment. Consult a qualified tax professional before making filing, payment, or abatement decisions. We are not affiliated with the Internal Revenue Service.