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IRS Penalty & Interest Calculator

Inputs

Penalty Type

Tax Year

2024

Original Due Date

April 15, 2025

Tax Balance Due ($)

Extension Filed?

Moves FTF start to Oct 15, 2025

Return Filed Date

Tax Paid Date

Not yet paid — calculate through today

Fill in the inputs on the left to calculate penalties and interest together.

Penalty rates per IRS.gov — Failure to File (5%/month, max 25%) · Failure to Pay (0.5%/month, max 25%) · Interest: IRC §6621–6622, compounded daily · Quarterly rates from IRS.gov · This calculator is for estimation purposes; consult a tax professional for official amounts.