TAX LAW CALCULATORS

IRS Late Filing Penalty Calculator — United States

Calculate IRS failure-to-file and failure-to-pay penalties on your unpaid tax balance. Penalties compound quickly — filing on time is always the best strategy.

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Amount of federal income tax owed (not paid) as of the original due date.
Number of months (or partial months) since the original return due date (not extension date).

Enter your details to see results

Disclaimer: IRS penalty rates and thresholds change annually. Verify current rates at irs.gov. Not legal or tax advice — consult a tax professional or enrolled agent.

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Frequently Asked Questions

What is the IRS failure-to-file penalty?
The IRS failure-to-file penalty is 5% of your unpaid tax for each month (or partial month) your return is late, capped at 25% (5 months). If your return is more than 60 days late, the minimum penalty is the lesser of $510 (2024) or 100% of the tax owed. When both failure-to-file and failure-to-pay penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay penalty, resulting in a combined 5% charge. The total of both penalties is capped at 47.5%.
What is the difference between failure-to-file and failure-to-pay?
Failure-to-file applies when you do not file a return by the due date (including extensions). It is 5% per month up to 25%. Failure-to-pay applies when you owe tax and do not pay it by the due date. It is 0.5% per month up to 25%. You can get a 6-month filing extension (Form 4868) which eliminates the failure-to-file penalty — but it does NOT extend the time to pay. You must estimate and pay your tax by April 15 even with an extension to avoid failure-to-pay penalties and interest.
How can IRS penalties be reduced or waived?
The IRS offers several penalty relief options: First-Time Penalty Abatement (FTA) — available if you have no penalties in the prior 3 years and are otherwise compliant; Reasonable Cause — if you had a legitimate reason for late filing (serious illness, natural disaster, incorrect advice from a tax professional); Statutory Exception — for penalties resulting from IRS errors or erroneous written advice from IRS. You can request abatement by calling the IRS, writing a letter, or using Form 843. A tax attorney can significantly improve your abatement success rate.

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