FBAR Filing: Deadlines, Thresholds and Filing Late

By Daniel Hiltzik, CPA · Updated September 15, 2026

At a glance

FBAR filing is triggered when your foreign accounts together touched $10,000 at any point in the year. It is a high-water mark, not a year-end balance.
The deadline is April 15, with an automatic extension to October 15 that nobody has to request.
Late filings go through the same form. Page one carries a drop-down reason and a 750-character box, not an attached letter.
A non-willful penalty runs to $16,536 per report, and reasonable cause defeats it only if the balance was also properly reported.

Most people who owe an FBAR filing find out about it years late, from an accountant, and the first question is always the same one: how much trouble am I in.

Usually less than the internet suggests. The FBAR is an information report, not a tax return. It collects no revenue. A first-time filer who was never hiding anything, whose accounts were reported on the return, and who files before anyone asks is in a very different position from the person the penalty regime was written for. This guide covers who has to file, what the $10,000 test actually measures, when it is due, and what to do if you are behind — which is where most readers of this page actually are.

Who has to file

The obligation falls on a US person, which means a US citizen wherever they live, a lawful permanent resident, someone who meets the substantial presence test under section 7701(b), and entities formed under US or state law. Citizenship is what matters, not residence — an American who has lived in Lisbon since 2004 and pays Portuguese tax on everything still files.

It applies to accounts you own and to accounts you merely control. Signature authority alone is enough — even with no beneficial interest in a cent of the money. That is how a US citizen who signs on their employer’s treasury account, or on an elderly parent’s account abroad, acquires a filing obligation they have never heard of. A separate FinCEN notice extends the deadline for people whose only obligation is signature authority: their 2025 report is not due until April 15, 2027.

The report itself is FinCEN Form 114, filed electronically through FinCEN’s BSA E-Filing System. It does not go to the IRS and it is not attached to your 1040 — the single most common procedural mistake on this form. The IRS administers the penalties; FinCEN receives the form.

The $10,000 test measures a high-water mark

The threshold is the aggregate maximum value of all foreign financial accounts at any time during the calendar year. Two words in that sentence do most of the damage. Aggregate means every account is added together, so five accounts of $2,500 each cross the line while none of them does alone. Any time means the highest balance each account touched, on any day, not what was sitting there on December 31.

Foreign accounts held all year	Maria, in Spain	Tom, in Japan
Checking, highest balance	$4,200	$9,800
Savings, highest balance	$3,500	—
Brokerage, highest balance	$3,800	—
Combined high-water mark	$11,500	$9,800
Balance on December 31	$2,100	$9,800
FBAR required	Yes	No

Illustrative figures, rounded.

Maria’s accounts held $2,100 between them when the year closed and she has to file. Tom’s held nearly five times that and he does not. Nothing about December 31 appears in the test.

The one-line version. Add up the highest balance each foreign account reached at any point in the year. If that number passes $10,000, every one of those accounts goes on the report, including the small ones.

Reportable accounts are broader than bank accounts: brokerage and investment accounts, mutual funds, most foreign pensions, and life insurance or annuity policies with a cash surrender value. Once you are over the threshold, you report all of them, not just the ones that pushed you over.

The deadline, and the extension you do not ask for

The FBAR is due April 15, aligned with the income tax return by the Surface Transportation and Veterans Health Care Choice Improvement Act of 2015. FinCEN grants every filer who misses that date an automatic extension to October 15, and in its own words, “specific requests for this extension are not required.”

So the 2025 calendar year report was due April 15, 2026, and the automatic extension runs to October 15, 2026, which has not yet passed. There is no form to file and nothing to apply for. A filer who submits on October 14 is on time, not late, and should not be selecting a late-filing reason on page one.

The automatic extension is not the same thing as the extension on your tax return, and it does not require one. Two different agencies, two different deadlines, one shared date.

Filing late: what actually happens

This is the part most guides skip, and it is the reason most people are reading. If you have never filed and should have, you are not in an obscure corner of the law. It is a well-worn path.

Delinquent FBARs go on the current form. The Internal Revenue Manual is explicit: file using the current electronic report, but use the instructions for the year being reported to work out whether a filing requirement existed at all, since the rules have moved over time.

There is no letter to attach. Page one of Form 114 asks why the report is late and offers a drop-down list. Choosing “Other” opens a free-text box capped at 750 characters. That is the whole of your reasonable cause statement. People search for a sample letter because they picture a formal submission; what exists is a paragraph, and 750 characters is roughly the length of this one.

The no-penalty rule has two prongs, and the second one catches people. Section 5321(a)(5)(B)(ii) says no non-willful penalty applies if “(I) such violation was due to reasonable cause, and (II) the amount of the transaction or the balance in the account at the time of the transaction was properly reported.” Reasonable cause on its own is not enough — if the interest and dividends from those accounts never appeared on your return either, the second prong fails, and the fix is a correction to the return as well as a late FBAR. The Manual states the same test operationally: a penalty is not asserted where the failure was not willful, it was due to reasonable cause, and the account was properly reported on the delinquent FBAR.

How many years. Where income was reported correctly and only the FBAR was missed, the practical answer is the open assessment window. FinCEN may assess a civil penalty “at any time before the end of the 6-year period beginning on the date of the transaction,” so six years is the horizon. The Streamlined Foreign Offshore Procedures, which exist for taxpayers whose income was not fully reported, use the same number: six years of delinquent FBARs alongside three years of returns.

One change worth knowing. The IRS long published a standalone page titled “Delinquent FBAR Submission Procedures.” As of today that page returns a 404, and the agency’s own list of options for taxpayers with undisclosed foreign assets names three routes: the Criminal Investigation Voluntary Disclosure Practice, the Streamlined Filing Compliance Procedures, and the delinquent international information return procedures. The FBAR-specific page is not among them. The underlying rule has not gone anywhere — it lives in the statute and the Manual, not on that page — but anyone working from a bookmark or an old checklist should know the landing page has moved out from under them.

What a missed FBAR costs

The figures below are the inflation-adjusted maximums and apply to penalties assessed on or after January 17, 2025. They are ceilings. They are not what a first-time non-willful filer with reported income should expect.

Violation	Maximum	Measured
Non-willful	$16,536	Per report, per year
Willful	$165,353	Per account, per year, or 50% of the balance if that is greater

31 CFR 1010.821, as in force September 2026.

The words “per report” in that first row are doing a great deal of work, and they are recent. In Bittner v. United States the Supreme Court held that “penalties for nonwillful violations accrue on a per-report, not a per-account, basis.” The government had argued for per-account, which on the facts of that case was the difference between a $50,000 exposure and a $2.72 million one. For a non-willful filer with a dozen small accounts, that decision is the single most valuable thing on this page.

Willfulness is a different regime entirely — measured per account, and not a question to answer casually about yourself. The gap between the two rows is wide enough that the characterization, not the arithmetic, is what a case turns on.

What to do about it

Work out the high-water mark for every account, for every year. Highest balance at any point, converted at the Treasury year-end rate. This is the tedious part and it is also the part that decides whether you had an obligation at all.
Check the returns before the reports. If the foreign interest and dividends were already on Schedule B, the second prong of the reasonable cause test is satisfied and a late FBAR is a straightforward matter. If they were not, that is the larger problem and the FBAR is downstream of it.
Decide honestly whether the conduct was non-willful. Not knowing the rule existed is the ordinary case. Knowing and choosing not to file is not, and it points at a different procedure.
File the open years together, on the current form, each with the reason selected on page one and the explanation in the 750-character box.
Keep the acknowledgements. Records should be held for five years, and the BSA system’s confirmation is the proof you filed on the date you say you did.

If your accounts also cross the Form 8938 thresholds, the two reports overlap without replacing one another. The differences, and the cases where you file both, are set out in FBAR vs Form 8938.

Frequently asked questions

Can I file an FBAR for previous years?

Yes. Delinquent FBARs are filed on the current electronic form, using the instructions for the year being reported to confirm a requirement existed. Page one asks why the report is late; you select a reason from the drop-down and, if you choose “Other,” explain in the 750-character box. Where the failure was not willful, was due to reasonable cause, and the account is properly reported on the late FBAR, the Internal Revenue Manual says a penalty is not asserted.

How many years of late FBARs do I have to file?

Six is the working answer. A civil penalty can be assessed at any time before the end of the six-year period beginning on the date of the transaction, so that is the open window. The Streamlined Foreign Offshore Procedures use the same figure: six years of delinquent FBARs, alongside three years of returns, for taxpayers whose income was also unreported.

Is there a sample letter for late FBAR filing?

No, and looking for one sends people down the wrong path. Nothing is attached and nothing is mailed. The explanation goes into a free-text box on page one of Form 114, capped at 750 characters, after you select a late-filing reason from the drop-down. What it should say is why the report was late, in plain terms, and that the accounts were reported on your returns if they were.

What is the FBAR filing deadline?

April 15, with an automatic extension to October 15. The extension is granted to everyone and requires no request, no form and no reason. For the 2025 calendar year that meant April 15, 2026, running to October 15, 2026. Filing in the extension window is filing on time.

What is the FBAR reporting threshold?

$10,000, measured as the combined highest balance of all your foreign financial accounts at any point in the calendar year. It is not per account and it has nothing to do with the year-end balance. Once you are over it, every foreign account goes on the report, including ones holding a few hundred dollars.

Who needs to file an FBAR?

Any US person over the threshold: citizens wherever they live, lawful permanent residents, anyone meeting the substantial presence test, and US entities. Signature authority over an account you do not own counts, which catches employees who sign on a company account abroad and children who sign on a parent’s. People whose only obligation is signature authority have until April 15, 2027 for the 2025 year.

What happens if I never file?

The maximum non-willful penalty is $16,536 per report for assessments on or after January 17, 2025, and the Supreme Court confirmed in Bittner that it is charged per report rather than per account. Willful violations are measured per account at the greater of $165,353 or half the balance. The gap between those two is why the characterization of the conduct, not the number of accounts, is what a case actually turns on.

Does the FBAR go to the IRS with my tax return?

No. It is filed with FinCEN through the BSA E-Filing System, separately from the 1040, and it cannot be attached to a return. The IRS enforces the penalties, which is the source of the confusion, but the report itself never goes there.

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This article is general information about federal reporting rules and is not legal, tax or investment advice for any particular situation. Figures are current as of September 2026 and are drawn from the primary sources cited: 31 CFR 1010.821 for the penalty amounts; 31 U.S.C. 5321 for the reasonable cause exception and the six-year assessment period; IRM 4.26.16 for the delinquent filing procedure; FinCEN on the due date and automatic extension; FinCEN Notice FIN-2025-NTC3 on signature authority; Bittner v. United States, No. 21-1195 (Feb. 28, 2023); and the IRS pages on the streamlined foreign offshore procedures and options for undisclosed foreign assets.