IRS Penalty & Interest
Calculator
Calculate your exact Failure to Pay, Failure to File penalties and daily compounded interest in seconds. 100% private. No pushy law firms.
Get the IRS First-Time Penalty Abatement (FTA) Request Letter & Detailed Daily Calculation Breakdown.
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How IRS Penalties & Interest Work
0.5% per month (max 25%) of unpaid tax under IRC § 6651(a)(2) starting from the original April due date.
5% per month (max 25%) under IRC § 6651(a)(1). Reduced to 4.5% if FTP applies concurrently.
Under IRC § 6622, interest compounds daily based on quarterly federal short-term rates published by the IRS.
Frequently Asked Questions
Does filing an extension give me extra time to pay?
No. Form 4868 grants an automatic 6-month extension to file your return (until October 15), but not to pay. The Failure to Pay penalty (0.5%/month) and daily interest still accrue from April 15.
What is the IRS First-Time Penalty Abatement (FTA)?
The IRS provides administrative relief under the First-Time Abatement policy for Failure to File or Failure to Pay penalties if you have filed all currently required returns and have a clean compliance record for the preceding 3 tax years.