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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 Israel Terror Relief — Postponed Deadlines

Check that you are an “affected taxpayer” before relying on this. Relief under these notices is not tied to simply being in Israel on some date. Notice 2026-63 lists who qualifies. The covered area is the State of Israel, the West Bank or Gaza. You are an affected taxpayer if any of the following applies:
  • Your principal residence is in the covered area (or, for a business or sole proprietor, your principal place of business is). This covers most Americans actually living in Israel;
  • You are affiliated with a recognized government or philanthropic organization and are assisting in the covered area, such as a relief worker;
  • Your tax return preparer, or the records you need to meet the deadline, are located in the covered area;
  • You are the spouse of an affected taxpayer, for a joint return; or
  • You were visiting the covered area and were killed, injured or taken hostage as a result of the terroristic action.
The IRS automatically identifies taxpayers whose address of record is in the covered area. If your situation is less clear cut, confirm it against the notice before treating a deadline as postponed.

A series of IRS notices provide relief for affected taxpayers following the terroristic action in Israel. Notice 2026-63 postpones qualifying acts due on or after September 30, 2026 and before September 30, 2027:

  • Notice 2023-71: Initial relief for the 2023 terroristic action.
  • Notice 2024-72: Relief for the 2023-2024 terroristic action, extending the postponement for affected taxpayers.
  • Notice 2025-53: Relief for the 2024-2025 terroristic action, postponing qualifying acts to September 30, 2026.
  • Notice 2026-63: Relief for the 2025-2026 terroristic action, postponing qualifying acts to September 30, 2027.

Effect if you qualify: where a covered deadline falls in the postponement window, the effective due date for filing and payment moves to September 30, 2027, and penalties and interest are generally not charged for the postponed period. The figures below are calculated on the assumption that you are an affected taxpayer. If you are not, the ordinary penalties and interest apply instead.

Covered deadlines: Filing returns, paying tax, estimated tax payments, Form 8938 (FATCA, which is filed with the return), and other time-sensitive acts listed in the notice.
FBAR is not covered by these IRS notices. FinCEN 114 is administered by FinCEN under the Bank Secrecy Act, not the IRS, and any FBAR relief comes from a separate FinCEN notice with its own dates. Notice 2026-63 does not mention FBAR or FinCEN anywhere in its text. Check the separate FinCEN notice for FBAR relief and its own dates.
Calculated as an affected taxpayer: no penalties or interest through Sept 30, 2027. This assumes you meet the notice’s affected-taxpayer definition above.

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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