Missed FBAR: The 2026 Catch-Up Guide for Americans in London

A Missed FBAR is corrected, not confessed. If you are a US person in London whose UK accounts topped $10,000 combined at any point in a year and you did not file FinCEN Form 114, you generally file the last six years late, either under the Delinquent FBAR Submission Procedures or inside a Streamlined Foreign Offshore submission. Both routes carry no penalty when handled correctly.

The difficulty for wealthy Londoners is almost never the filing itself. It is the inventory. In our experience the overwhelming majority of a Missed FBAR problem is not a hidden Swiss account; it is a Revolut wallet opened for a holiday, a Hargreaves Lansdown platform funded from a bonus, a set of Premium Bonds bought for the children, a company account signed on as a director, and an elderly parent’s account added under a power of attorney. Each of those is reportable. None of them feels like an “offshore account” to the person holding it. This guide fixes the inventory first, then walks the catch-up mechanics.

What actually counts as a Missed FBAR?

The FBAR is filed with FinCEN, an arm of the US Treasury, not with the IRS and never with HMRC. A US person — citizen, green card holder, or someone meeting the substantial presence test — must file when the aggregate maximum value of all foreign financial accounts exceeds $10,000 at any moment during the calendar year. Two points are routinely misread:

• The test is aggregate, not per account. Eleven accounts holding £1,000 each trigger the obligation as surely as one account holding £500,000. Once the aggregate is breached, every account is reported, including the £40 dormant Monzo pot.
• The test is a high-water mark, not a year-end balance. A property deposit that transited your current account for four days sets the maximum value for that account for the whole year. This is why a single house purchase, a bonus, or a share sale creates a filing year for people who otherwise sit far below the threshold.

The FBAR is due 15 April with an automatic extension to 15 October — you do not request the extension, it simply applies. An FBAR becomes delinquent only after 15 October of the following year. So on today’s date, the 2025 FBAR is not yet late; the 2024 report and earlier are. The IRS confirms the threshold, the deadline and the automatic extension on its official FBAR page.

Why London produces more Missed FBAR cases than anywhere else

Two structural facts make London distinctive. First, density: a professional or founder in London accumulates UK financial relationships at a pace that would be unusual in most other cities — a current account, a savings account, two fintech wallets, a workplace pension, a SIPP, an ISA, a share incentive plan, a business account, and a joint account for the household. Ten to fifteen reportable accounts is normal, not exotic.

Second, visibility. Under the US–UK intergovernmental agreement implementing FATCA, UK financial institutions identify US-person account holders and report them through HMRC to the IRS. The data flows annually and automatically. HMRC applies parallel due-diligence and account-classification rules across FATCA and the Common Reporting Standard, and the classification of UK products is set out in its International Exchange of Information Manual. The practical consequence: the account you forgot has very often already been reported by your bank. A voluntary catch-up filed before contact is a materially different conversation from one filed afterwards.

The account inventory wealthy Londoners get wrong

This is where a Missed FBAR project is won or lost. Work through each category below before you file anything — an incomplete late filing is worse than a complete one, because it must later be amended and it undermines the non-willful narrative.

UK e-money and fintech wallets

Revolut, Wise, Monzo, Starling, Monese, Payoneer, Curve and similar UK-licensed e-money and banking apps hold funds in accounts maintained at a foreign financial institution. They are reportable. Multi-currency wallets compound the problem: a Wise account holding GBP, EUR and USD balances is generally reported by account, but each currency pocket must be converted and the aggregate maximum captured. Clients routinely omit these because the app does not feel like a bank and because the balance is small — but small balances still count toward the aggregate and still must be listed once the aggregate is met.

Brokerage, platform and ISA accounts

Hargreaves Lansdown, AJ Bell, interactive investor, Fidelity UK, Vanguard UK, Charles Stanley and their peers all maintain foreign financial accounts. So does a general investment account, a cash ISA, a stocks and shares ISA, a Lifetime ISA and a Junior ISA held for a child where you have an interest or authority.

The ISA deserves its own warning. The UK tax wrapper is invisible to the IRS: an ISA is not tax-free for a US person, its income and gains are reportable annually, and a stocks and shares ISA holding UK-domiciled OEICs, unit trusts or investment trusts almost always contains passive foreign investment companies, which carry their own punitive regime and Form 8621 obligations. A client who discovers a Missed FBAR on an ISA has usually also discovered an unreported income problem — and that changes which catch-up route is available. Our cross-border tax team treats ISA discovery as a trigger for a full review rather than a single form.

NS&I Premium Bonds and government savings products

Premium Bonds are the single most commonly omitted UK holding we see, because holders think of them as a lottery ticket rather than an account. They are held with National Savings and Investments, a UK institution, they carry a redeemable balance, and they are reportable. Prizes are not tax-free for US purposes either — they are income on the US return, however the UK treats them. The same applies to NS&I Direct Saver, Income Bonds and savings certificates.

UK pensions, SIPPs and employer share plans

A UK self-invested personal pension and, in most analyses, a defined-contribution workplace pension are foreign financial accounts and are reported on the FBAR. Defined-benefit entitlements without an individual account balance are treated differently and often fall outside the report. Employer share arrangements are frequently overlooked: SAYE/Sharesave savings contracts, Share Incentive Plan accounts, and nominee or broker accounts holding vested RSUs are all account-like and generally reportable.

Note the split that catches people out: the FBAR treatment of a pension and the income tax treatment under the US–UK treaty are separate questions. Reporting the account does not create a tax charge, and treaty relief on growth does not remove the reporting duty. See our guidance for high-net-worth cross-border clients on how these interact.

Accounts held through a UK company or LLP

If you own directly or indirectly more than 50% of a UK limited company or LLP by vote or value, you must report the entity’s foreign accounts on your personal FBAR. Founders consistently miss this. The company’s Barclays business account, its Revolut Business wallet, its deposit account and its foreign-currency account all belong on your personal Form 114 alongside your personal accounts. A UK company also raises Form 5471 and, potentially, GILTI and Subpart F questions — and a company discovered late almost always means missed 5471s as well as a Missed FBAR.

Accounts you merely sign on

Signature authority alone — without any beneficial interest — creates a filing obligation. In practice this means:

• An elderly parent’s UK account you operate under a power of attorney;
• Your employer’s UK bank account if you are a signatory as CFO, finance director or office principal;
• A charity, school, club or PTA account where you are treasurer or trustee;
• A family trust’s bank account on which you can direct disbursements;
• A solicitor’s or estate account where you are executor and control the funds.

Signature-authority accounts are reported in a separate part of the form, and the values are not your assets — but they are still disclosed. Certain employees of listed companies and regulated institutions benefit from narrow exceptions; most people do not.

Joint accounts with a non-US spouse

A joint account with a British spouse is fully reportable by the US person, at 100% of its maximum value, not at half. If both spouses are US persons and all accounts are jointly held, one spouse can file for both using FinCEN Form 114a authorisation. Where only one spouse is American, the account is reported on that person’s FBAR and the non-US spouse remains outside the US system.

What generally is not reportable

To avoid over-reporting: UK real property held directly is not a financial account; physical gold or art in a private safe deposit box is generally not; an unfunded defined-benefit promise usually is not; and a UK life policy with no cash surrender value is not, although an investment bond with a surrender value is. Accounts held at a US branch, and accounts maintained by certain international organisations, are excluded. Where cryptocurrency held on a UK exchange sits in relation to the FBAR has been the subject of proposed change for several years; if you hold crypto through a UK platform that also holds fiat balances for you, treat the fiat side as reportable and take advice on the rest.

How many years of Missed FBARs must you file?

Six. The civil enforcement window for FBAR violations runs six years from the due date of the report, so a complete catch-up covers the six most recent years for which the deadline has passed. Filing more years than that is not usually helpful and can create noise; filing fewer leaves live exposure.

Two refinements matter. First, you file only for years in which the $10,000 aggregate was actually breached — if 2020 was genuinely below the line, there is nothing to file for 2020, and you should document why. Second, if you are also correcting income under the Streamlined Foreign Offshore Procedures, the years do not match: streamlined requires three years of tax returns and six years of FBARs. That mismatch is deliberate and correct, and it confuses almost every first-time filer.

Which catch-up route applies to you?

The choice turns on one question: was the income from those accounts correctly reported on your US returns?

Route	Use when	What you file	Penalty position
Delinquent FBAR Submission Procedures	US returns were filed and all account income was reported — only the FBARs are missing	Six years of FinCEN Form 114, each with a reason for late filing	No penalty where the IRS accepts the explanation and there is no unreported income
Streamlined Foreign Offshore Procedures	Income was unreported or returns were never filed, non-willful conduct, and you meet the non-residency test	Three years of returns, six years of FBARs, Form 14653 certification	No Title 26 penalty and no FBAR penalty for qualifying non-US residents
Streamlined Domestic Offshore Procedures	Same as above but you fail the non-residency test	Three amended returns, six years of FBARs, Form 14654	5% miscellaneous offshore penalty on the highest aggregate balance
IRS Criminal Investigation Voluntary Disclosure Practice	Conduct may be willful or the facts are aggravated	Pre-clearance, then a six-year disclosure period	Protection from criminal referral; civil penalties apply
“Quiet” disclosure	Never	Late FBARs filed with no explanation	Outside all programmes; the IRS has said it may examine these

For a US citizen genuinely living in London the Streamlined Foreign Offshore Procedures are usually available, because the non-residency test is met by having no US abode and being physically outside the United States for at least 330 full days in one of the three years covered. That is the version of streamlined with no penalty at all. The IRS sets out both variants and the certification requirements on its streamlined filing compliance procedures page.

If your only failure is the report itself — returns filed, interest and dividends declared, ISA and pension income handled correctly — do not use streamlined. The Delinquent FBAR Submission Procedures are lighter, faster, and do not require you to certify anything about willfulness or reopen closed tax years.

How the late submission is actually made

The mechanics are unforgiving in detail and simple in shape.

• Build the inventory. One row per account per year: institution name and address, account number, account type, whether owned or signature-only, joint holder details, and maximum value during the year. Twelve accounts across six years is seventy-two data points, and every one must be defensible.
• Reconstruct the maximum values. UK banks typically retain six or seven years of statements; most will produce a historic balance summary on request. Where a record genuinely cannot be recovered, the form allows a value to be marked as unknown — but a reasonable, documented estimate is almost always preferable to that election.
• Convert correctly. Values are converted to US dollars using the Treasury Reporting Rate of Exchange for 31 December of the year in question — not the rate on the day the balance peaked, and not an average rate. Applying the wrong convention is the single most common technical error we correct.
• File electronically. Each year is a separate FinCEN Form 114 submitted through the BSA E-Filing System. Paper is not an option for individuals.
• Select the reason for filing late. The cover page offers a drop-down; where none of the listed reasons fits, choose “Other” and enter a concise explanation. Keep it short, factual and consistent across all six years.
• Retain the acknowledgements. Save the BSA tracking ID for each year. This is your proof of a voluntary, pre-contact filing.

Sequencing matters when a streamlined submission is involved: the FBARs are e-filed and the paper package of returns and Form 14653 is posted to the dedicated IRS address, and the two must tell the same story. Our streamlined filing specialists prepare and lodge both sides together so that the account schedule in the certification matches the FBARs line for line.

US and UK obligations compared

Question	United States (IRS / FinCEN)	United Kingdom (HMRC)
Is there an account-reporting form for individuals?	Yes — FinCEN Form 114 (FBAR), plus Form 8938 with the tax return	No equivalent standalone form; offshore income and gains are declared on the Self Assessment return
Reporting trigger	$10,000 aggregate at any point in the year	Chargeable income or gains arising, subject to residence and remittance rules
Are ISAs sheltered?	No — income and gains are fully taxable and reportable; PFIC rules often apply	Yes — income and gains inside an ISA are exempt and need not be declared
Premium Bond prizes	Taxable income and the holding is a reportable account	Tax-free
Voluntary correction route	Delinquent FBAR Submission Procedures; Streamlined Filing Compliance Procedures	Worldwide Disclosure Facility and the Digital Disclosure Service
Look-back on correction	Six years of FBARs; three years of returns under streamlined	Up to 4, 6 or 20 years depending on behaviour
Who receives the data on your UK bank account?	The IRS, via FATCA	HMRC collects and transmits it under the IGA

The point of the table is the asymmetry. Nothing you do for HMRC discharges the FBAR, and nothing you file with FinCEN reaches HMRC. A Londoner who is perfectly compliant in the UK can still have six years of missed reports in the US, and frequently does. Where a disclosure is needed on both sides at once, the two timetables have to be managed deliberately — see our US-UK tax specialists for how those run in parallel.

What is the real penalty exposure in 2026?

Statutory FBAR penalties are severe on paper and are adjusted annually for inflation: a non-willful violation attracts a maximum in the region of five figures per violation, and a willful violation can reach the greater of a substantially larger fixed amount or 50% of the account balance, per year. Criminal exposure exists in extreme cases.

Three things temper that in practice. First, the Supreme Court’s 2023 decision in Bittner v. United States confirmed that the non-willful penalty applies per annual report, not per account — which transformed the arithmetic for someone with fifteen small UK accounts, from a theoretical figure in the hundreds of thousands to a single per-year maximum. Second, the delinquent and streamlined procedures are designed to produce a nil penalty when the conditions are met. Third, and most importantly, the penalty regimes bite hardest after IRS contact. Filing voluntarily, before a letter arrives, is the substantive protection — not a technicality.

If you want to see how exposure scales before you speak to anyone, our FBAR penalty calculator models the range on your own numbers.

The mistakes we correct most often

• Filing only the years the client remembers. A partial catch-up looks selective. Six years or a documented reason why a year is out of scope.
• Reporting half a joint account. The US person reports the whole balance.
• Using year-end balances instead of maximum values. The high-water mark governs.
• Omitting the company account. More than 50% ownership pulls the entity’s accounts onto your personal form.
• Treating the ISA as invisible. It is a reportable account and usually an income and PFIC issue as well.
• Using streamlined when nothing was unreported. This needlessly reopens tax years and requires a willfulness certification you did not need to make.
• Writing a long, emotive reasonable-cause narrative. Short, factual and consistent is stronger than expansive.
• Filing quietly. Late FBARs with no stated reason sit outside every published procedure.

A realistic timeline

For a straightforward delinquent-FBAR-only catch-up with a well-documented client, the work is typically completed inside two to four weeks: one week to assemble the inventory and obtain historic balances from UK institutions, a few days to convert and prepare, and same-day electronic submission of all six years. Where a streamlined submission is required — unreported ISA income, a UK company, PFIC holdings, missed 8938s or 5471s — expect six to ten weeks, because three years of returns, the PFIC analysis and the Form 14653 narrative all have to be built before anything is lodged.

There is no acknowledgement letter for a delinquent FBAR filing. Silence after submission is the normal and expected outcome; the BSA tracking IDs are your record. Streamlined submissions are likewise not formally “accepted” — they are processed, and the absence of follow-up is the result you want.

Bring the position back to certainty

A Missed FBAR is one of the few cross-border problems that gets meaningfully cheaper the earlier it is addressed and meaningfully worse the longer it sits — not because of interest, but because the moment a UK bank’s FATCA report triggers IRS contact, the no-penalty routes close. Jungle Tax handles US–UK catch-up filings for founders, executives, partners and private clients across London every week: we build the inventory, recover the historic balances, choose the right route, and lodge the submission so it is complete the first time.

If you have found accounts you did not know were reportable, or you already know six years are outstanding, contact our cross-border team for a confidential, privileged consultation. We will tell you plainly which route applies, how many years are in scope and what the realistic exposure is — before anything is filed.