What Happens If You
Don’t File an FBAR?
The penalty splits into two very different paths depending on whether you “didn’t know” or “knew and didn’t file.” Once you see where that fork is, the rest gets a lot clearer.
💭 “I haven’t filed in years — what happens now? Would ‘it was a mistake’ actually work as an excuse?”
Search for the penalty amounts and all you get is scary numbers, with no way to tell which side you actually fall on. Let’s find that fork in the road first, then you’ll know where you stand.
📌 Quick Summary
FBAR penalties differ enormously depending on whether the failure to file was non-willful or willful. Non-willful tops out at $16,536 per year, but a willful finding can take up to half your account balance. And willfulness can be established without any active act of concealment — one case turned on a single checkbox on a tax return. The good news: there’s a separate procedure that clears things up with no penalty at all, as long as you act before the IRS contacts you first.
🔑 Key Takeaways
· Penalties split into non-willful (up to $16,536/year) and willful (up to 50% of the balance) — that fork accounts for almost the entire gap.
· Willfulness doesn’t require “hiding” anything. Simply avoiding finding out about the filing duty (willful blindness) can be enough.
· One case (Williams) used a “No” checked on Schedule B as evidence.
· Penalties are assessed per year, not per account (Bittner) — but only when the violation is non-willful.
· A low audit rate (TIGTA: 7.3%) is not a reason to relax — it means the IRS already has you in its data, just hasn’t gotten to you yet.
· If the IRS hasn’t contacted you yet, the Streamlined Procedure can clear things up, and meeting the foreign-residency test (330 days) means no penalty at all.
1FBAR Penalties Split Into Two Paths
The FBAR (FinCEN Form 114) is an information return you must file if your foreign financial accounts add up to more than $10,000 on any single day of the year. It isn’t a tax form — it’s just a disclosure that the accounts exist. And that’s exactly what makes this rule so sharp: the penalty for missing it can end up bigger than any tax you’d actually owe.
NON-WILLFUL
$16,536
Maximum per year. For genuine mistakes or not knowing. The total also can’t exceed 50% of the highest combined balance across the accounts involved.
WILLFUL
50% / $165,353
Whichever is greater: 50% of the balance, or this flat amount. No separate cap, so it keeps climbing as your balance does.
The numbers look like a 10x gap, but the real difference runs deeper. Non-willful is a fixed amount — it stops growing no matter how big your account is. Willful scales with your balance instead. Have $200,000 in the account? A willful finding puts $100,000 on the table as the baseline.
There’s one more safety net for non-willful penalties. IRS internal guidance (IRM 4.26.16.5.4.1) caps the total non-willful penalty at 50% of the highest combined balance across all related foreign accounts for the year — meaning even several years of back filings can’t push you past that ceiling.
2The 3 Standards for “Willful”
This is the part that matters most. Most people picture “willful” as “deliberately hiding something,” but the real legal standard is wider than that. IRS internal guidance (IRM 4.26.16.5.5.1) defines willfulness three ways.
Choosing not to file accurately despite knowing the filing duty existed
Ignoring a risk that was unreasonably high
Consciously steering clear of finding out you had a filing duty
Number ③ is the one that catches people off guard! You don’t have to actively hide anything — simply “never checking” can be enough on its own. If you knew you had a foreign account, never once looked into the notices, and never sought tax advice for years, that neglect itself can be held against you.
The court confirmed that reckless disregard alone — the kind where “a reasonable person would have known about the FBAR duty” — is enough to trigger the top-tier willful penalty. This ruling pushed the bar for a willful finding even lower.
The court found that the IRS imposing a $1 million FBAR penalty without a jury trial violated the Seventh Amendment, opening up a new constitutional defense for taxpayers. So the recent case law isn’t moving in just one direction.
3Why Checking “No” on Schedule B Is Risky
Schedule B, attached to Form 1040, asks: “Do you have a financial interest in or signature authority over a foreign financial account?” There’s a landmark case where that single checkbox became the actual evidence for a willful finding.
The taxpayer had wired $7 million into a Swiss bank account, yet answered “No” to the foreign-account question on Schedule B Part III. The court held that the act of signing the return itself established “constructive knowledge” of the question inside it — and combined with the fact that he’d never once reviewed the FBAR form or its instructions, that was enough to find at least reckless disregard, if not willful blindness.
What makes this case especially tricky is that it flips the usual defense on its head. For “I just clicked the wrong box by accident” to hold up, you need supporting evidence — a record that you reviewed the instructions at the time, or that you explicitly asked your tax preparer about it. Without that record, all that’s left is the fact that you signed.
🧩 Hypothetical · Discovering 5 years of missed filings
Situation A, a U.S. citizen living in Korea, has $40,000 combined across two Korean bank accounts and hasn’t filed an FBAR in five years. She’s kept up with her income tax returns the whole time, checking “No” on Schedule B every year.
Facts to check Whether the combined balance crossed $10,000 during the year (it did), her history of Schedule B answers, when she became aware of the filing duty, and whether any tax-advice records exist.
Applicable rules Since the combined balance exceeded $10,000, an FBAR duty existed — and since it wasn’t filed, a penalty applies. Whether it’s willful is judged under the three-pronged standard in IRM 4.26.16.5.5.1.
Exceptions to consider If she genuinely didn’t know about the duty and has evidence to back that up, this could still land as non-willful. But her history of checking “No” every year on Schedule B could just as easily be used as grounds for willful blindness, following the Williams logic.
The deciding factor isn’t the account balance — it’s whether records exist. Even at $40,000, a willful finding would shift the penalty from a fixed amount to a percentage of the balance.
Bottom line If this is sorted out before any investigation starts, using the Streamlined Procedure below is far more favorable. Once an investigation has started, that option is off the table.
This is a hypothetical. Actual outcomes depend on individual facts and require case-by-case review.
4FBAR Penalties Are Calculated Per Year, Not Per Account
One long-running fight over FBAR has finally been settled: does the penalty multiply by the number of accounts, or does it apply just once per tax year?
A taxpayer filed late on 272 accounts. The government tried to calculate the penalty per account — landing on $2.72 million. The Supreme Court ruled 5-4 that penalties apply per year, cutting the total down to $50,000.
This didn’t come out of nowhere. The Ninth Circuit (Boyd, 2021) had already scaled back a per-account penalty of $47,279 on 14 late-filed UK accounts down to a single fine, and a Connecticut district court (Kaufman, 2021) reached the same conclusion. Other circuits had ruled the opposite way, though, allowing per-account penalties — and that split is exactly what Bittner resolved.
In short: a large number of accounts won’t cause a non-willful penalty to balloon indefinitely. But that protection only applies if the violation is found non-willful. A willful finding is calculated as a percentage of the balance from the start, so it doesn’t benefit from this ruling at all.
5Two Ways FBAR Non-Filing Gets Discovered
Automatic financial data exchange. Korean financial institutions screen for U.S.-taxpayer status when opening accounts, and that data flows to the IRS automatically under the FATCA agreement and CRS.
It surfaces during an income tax audit. If foreign accounts or income turn up during an income tax audit, the examiner decides whether it’s connected to an FBAR issue and expands the audit from there.
Path ① matters because the infrastructure is already running. The moment you open an account at a Korean bank, it checks whether you’re a U.S. taxpayer, and that result gets forwarded automatically, every year. The assumption that “they won’t find out if I don’t file” doesn’t really hold up under this system anymore.
Path ② is the more common entry point in practice. It’s more usual for a foreign account to surface in the middle of an income tax audit than for FBAR to get flagged entirely on its own.
6What the 2026 TIGTA Numbers Actually Show
“The odds are low, so I’ll be fine” is a common — and risky — assumption. A report from the IRS Inspector General’s office (TIGTA), released April 8, 2026, puts real numbers behind it.
12 people
Audits opened (7.3%)
$39.7M
Additional tax collected
TIGTA pointed to two reasons for the low audit rate: campaign staff weren’t measured on assessing penalties, and Large Business & International (LB&I) lost 742 revenue agents in fiscal year 2025.
What this really means is that the IRS already knows who hasn’t filed — it just doesn’t have the staff to act on it yet. The list exists in the data. If staffing and budget get restored, retroactive audits become entirely possible.
And probability isn’t the same thing as how much you’d lose. Even at a 7% audit rate, getting caught and found willful can mean half your account balance. That’s not a bet worth making on long odds. There’s a countervailing trend, too: 2025 IRS guidance now requires priority FBAR cases to be closed or sent to appeals within 90 days, down from 120. Staffing is down, but the cases that do get picked up move faster.
7How to Fix Unfiled FBARs: the Streamlined Procedure
Sorting this out yourself before the IRS reaches out first, versus getting caught after an audit begins, leads to completely different outcomes. There’s a dedicated voluntary-disclosure track called the Streamlined Filing Compliance Procedures. Eligibility takes three things: you can certify the failure to file wasn’t willful, you have a valid taxpayer ID number, and you’re not currently under IRS examination.
Review whether you can certify the non-filing wasn’t willful. Check whether you physically resided outside the U.S. for at least 330 days in any 12-month period — this requirement is what splits the track. And if an IRS investigation is already underway, this procedure isn’t available, so check for any investigation notice first.
Prepare the last 3 years of income tax returns (amended or unfiled), the last 6 years of FBARs, each account’s bank name, address, account number, and highest annual balance, your SSN or ITIN, and any co-owner information.
FBARs can only be filed electronically, at bsaefiling.fincen.gov. Make sure there’s a record showing you filed before the IRS contacted you (IRM 4.26.16.5.2.1).
FOREIGN
No penalty
330+ days physically abroad
DOMESTIC
5% of highest balance
Foreign-residency test not met
If you actually live in Korea, hitting the 330-day requirement tends to be fairly easy — which means a lot of people in this situation qualify for the no-penalty Foreign track. That said, it comes down to actually counting the days you were present, so it needs individual verification.
8How Unfiled FBARs Can Affect Immigration Review
A USCIS policy memo issued August 15, 2025 folded tax-filing compliance into the “Good Moral Character” review for naturalization (N-400) and permanent residency (I-485) applications. If IRS records show non-filing, false filing, or willful tax evasion, it can now count against you in that review.
This is a real shift in priority, especially if you’re a green card holder or preparing to naturalize — it means a tax issue can now spill over into an immigration-status issue, not just stay contained as a tax matter.
That said, exactly where the threshold sits isn’t clear yet — there simply aren’t enough cases on record. For now, the honest answer is “the door has opened,” nothing more precise than that.
⚠️ One thing to watch out for
Just filing the late FBARs on your own isn’t always the best move. If you discover past non-filing and immediately file the back years yourself, you skip right past the non-willful certification step of the Streamlined Procedure.
The right order is check eligibility → pick a track → then file.
This procedure is only available before an investigation starts. Once you’ve received a notice, you’ll need a different route entirely — so timing alone decides how many options you have.
9Frequently Asked Questions
💬 Won’t voluntarily disclosing now just create a problem that wasn’t there before?
Actually, it’s the opposite. Under FATCA and CRS agreements, the IRS is already receiving your Korean financial-institution account data automatically — the account’s existence isn’t new information to them. Voluntary disclosure isn’t revealing a secret; it’s you getting ahead of information the IRS already has. That’s exactly why the IRM lists cooperation and having disclosed before any warning as factors that reduce the penalty.
💬 What happens if I keep putting it off because the penalties scare me?
The unfiled years just keep piling up. Since Bittner made penalties per-year, every extra year you wait adds to your exposure. Deal with it now, and you only have to clean up what’s accumulated so far. On top of that, the Streamlined Procedure is only available before an investigation starts — so the longer you wait, the more likely your best option disappears entirely.
This article was written as of July 25, 2026. Penalty amounts reflect 2025 inflation-adjusted figures and are updated annually; the standards above may be revised later, so check the latest guidance before you actually file.
🔗 Show references
Primary sources (statutes, government documents, official statistics)
IRS, IRM 4.26.16 ·
IRS, IRM 4.26.17 ·
Streamlined Procedures ·
FinCEN, FBAR ·
TIGTA Report 2026-308-009
Bittner v. United States (2023) · United States v. Williams (2012) · United States v. Boyd (2021) · United States v. Kaufman (2021)
Secondary sources (expert commentary, industry press)
Journal of Accountancy · Expat Tax Online · Greenback · Freeman Law · Shin & Kim (Korean law firm) · Hunton
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