For United States citizens residing abroad who secured an extension to submit their 2025 federal income tax returns, a critical deadline is looming on Thursday, October 15, 2026. This date also serves as the final deadline to submit the Report of Foreign Bank and Financial Accounts (FBAR).
A common point of confusion for American expats is what this extension actually covers. While Form 4868 grants extra time to file tax paperwork, it does not offer any additional time to pay taxes owed. Any tax liability for the 2025 tax year was legally due on April 15, 2026. Consequently, both interest and late-payment penalties have been accumulating since April, rather than starting from the June or October filing dates.
The financial consequences of unpaid taxes compound daily. With the current interest rate set at 7 percent annually, a remaining balance of $6,000 carried from April 15 to October 15 will accumulate slightly over $200 in interest alone. In addition to interest, the IRS charges a separate late-payment penalty of 0.5 percent of the unpaid tax for each month or fraction of a month the balance remains outstanding, capped at a maximum of 25 percent. As explicitly stated on Form 4868: "Form 4868 doesn't extend the time to pay taxes." Expats who owe money are advised to pay immediately via IRS Direct Pay or set up an IRS payment plan to halt further interest accumulation.
Under standard IRS rules, American expats receive an automatic two-month filing extension to June 15 without needing to submit any paperwork. To push this deadline further to October 15, taxpayers had to file Form 4868 by that June date. October 15 is also the final day to submit the FBAR. This requirement applies to any US citizen whose combined foreign financial accounts exceeded $10,000 at any point during 2025. This threshold includes accounts over which the taxpayer has signature or other authority without direct ownership, such as business accounts, as well as accounts that were closed during the calendar year.
Unlike federal tax returns, the FBAR is not submitted to the IRS; instead, it must be filed electronically with the Financial Crimes Enforcement Network (FinCEN) using the BSA E-Filing System. Fortunately, the October 15 deadline extension for the FBAR is entirely automatic, requiring no extra paperwork if the initial April 15 deadline was missed. However, failing to file can be exceptionally costly. The maximum penalty for a non-willful FBAR violation stands at $16,536. Following the landmark 2023 US Supreme Court ruling in Bittner v. United States, this penalty is assessed per annual report rather than per individual account.
Missing the October 15 tax filing deadline triggers a failure-to-file penalty of 5 percent of any unpaid tax per month or partial month, up to a 25 percent limit. While many expats ultimately owe nothing to the US government due to tax relief mechanisms like the Foreign Tax Credit and the Foreign Earned Income Exclusion, these benefits are not automatic. Taxpayers must actively file a return to claim these exclusions and bring their liability down to zero.
For those who realize they cannot meet the October 15 deadline, a final discretionary extension to December 15, 2026, can be requested. This requires writing a letter to the IRS explaining the circumstances; the IRS will only respond if the request is denied. For those who missed the June 15 deadline without filing Form 4868, filing as soon as possible is critical to stop the monthly accrual of the failure-to-file penalty. Eligible taxpayers may benefit from the IRS's new "Automatic Exemption from Penalty" program, which replaces the former First-Time Abatement process for 2025 returns. This relief is applied automatically if the taxpayer has filed and paid on time for the preceding three years, though it does not cover FBAR or other international information return penalties.
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