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IRS Interest & Penalty Calculator

Failure-to-file, failure-to-pay, estimated tax & balance-due interest
A planning tool — not tax advice. This tool produces estimates from general rules and the numbers you enter. It is designed to orient you, not to decide for you — it cannot account for the facts that make your situation yours. Before acting on any result, speak with a qualified cross-border tax professional.

Tax Year & Filing Settings

Living Abroad — Automatic 2-Month Extension

  • US citizens and residents living outside the US and Puerto Rico get an automatic 2-month extension to file and pay (to June 15).
  • No form needed — just attach a statement to the return explaining you qualify.
  • However: Interest on unpaid tax still runs from the original April 15 deadline.
  • This is different from Form 4868 — you can file Form 4868 in addition to get until Oct 15 to file.
Effect on penalties: Payment penalty (FTP) starts from June 15, but interest accrues from April 15. If an extension is also filed, filing deadline moves to Oct 15 while payment penalty start stays June 15.

IRS Terror Relief — Postponed Deadlines

Three IRS notices provide relief for taxpayers affected by the October 7, 2023 terrorist attacks in Israel:

  • Notice 2023-71 (Oct 2023): Initial postponement — deadlines falling on or after Oct 7, 2023 postponed to Oct 7, 2024.
  • Notice 2024-34 (Mar 2024): Extended the postponement period and expanded scope of relief.
  • Notice 2025-53 (2025): Further extended all postponed deadlines to September 30, 2026.

Effect: If the original due date (or extended due date) falls between Oct 7, 2023 and Sept 30, 2026, the effective due date for both filing and payment becomes Sept 30, 2026. No penalties or interest accrue until after that date.

Covered deadlines: Filing returns, paying tax, estimated tax payments, FBAR/FATCA filing deadlines, and other time-sensitive acts.
✓ No penalties or interest — within Israel terror relief period (deadline extended to Sept 30, 2026)

Late Filing & Late Payment Penalties

Form 1040 — Failure-to-file and failure-to-pay penalty computation

Underpayment of Estimated Tax

Form 2210 — Estimated tax penalty for individuals

Q1 (Apr 15)
Q2 (Jun 15)
Q3 (Sep 15)
Q4 (Jan 15)

Underpayment Interest on Balance Due

Daily compounding interest at the federal short-term rate + 3%

International Penalty Reference

Common penalties for foreign information returns — for reference only

FormDescriptionPenalty
Form 5471 Information Return of U.S. Persons with Respect to Certain Foreign Corporations $10,000 per form per year. Additional $10,000 for each 30-day period of continued non-compliance after IRS notice, up to a maximum additional penalty of $50,000.
Form 5472 Information Return of a 25% Foreign-Owned U.S. Corporation or Foreign Corporation Engaged in a U.S. Trade or Business $25,000 per form per year. Additional $25,000 for each 30-day period after IRS notice of continued non-compliance.
Form 3520 Annual Return to Report Transactions with Foreign Trusts and Receipt of Certain Foreign Gifts Foreign trusts: 35% of gross value of property transferred to a foreign trust; 35% of gross distributions received from a foreign trust; 5% of gross value of trust corpus if information return not filed.
Foreign gifts: 5% of gift amount per month (or part), up to 25%.
FBAR
(FinCEN 114)		 Report of Foreign Bank and Financial Accounts Non-willful: Up to $16,536 per violation (2025, adjusted annually).
Willful: Greater of $165,353 (2025, adjusted annually) or 50% of account balance per violation.
Form 8938
(FATCA)		 Statement of Specified Foreign Financial Assets $10,000 failure-to-file penalty. Additional $10,000 for each 30-day period after IRS notice, up to $60,000. Plus 40% accuracy-related penalty on any underpayment attributable to undisclosed foreign financial assets.
Form 8865 Return of U.S. Persons with Respect to Certain Foreign Partnerships $10,000 per form per year. Additional $10,000 for each 30-day period of continued non-compliance after IRS notice, up to $50,000.
Form 926 Return by a U.S. Transferor of Property to a Foreign Corporation 10% of the value of property transferred, up to a maximum of $100,000.
Disclaimer: This tool provides estimates for informational purposes only and does not constitute tax advice. Actual IRS calculations may differ due to rounding, partial-month rules, and other factors. Interest rates shown are for individual non-corporate taxpayers. Consult a qualified cross-border tax professional. Book a consultation with Y2J.
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