Why FBAR Signature Authority Catches Wealthy Americans Unaware
FBAR signature authority is the single most overlooked trigger in US offshore reporting, and it catches wealthy Americans in Britain every year. Most sophisticated filers understand that they must report accounts they own. Far fewer realise that the obligation extends to accounts they merely control. Consequently, a US citizen who signs on a company account, a colleague's account or a parent's account can hold a full reporting duty over money that is not theirs.
The rule is deceptively simple in statute and brutally complex in practice. Furthermore, the penalties attach to the person who failed to file, not to the entity that owns the account. Therefore, an American managing director in London can face personal exposure running to six figures because a corporate treasury account never appeared on their own FinCEN Form 114.
At TaxYork, we review these positions constantly for investment professionals, company owners and dual nationals across the UK. In our experience, roughly one in three new high-net-worth clients has at least one unreported signatory role. Moreover, most of them filed FBARs diligently for years while remaining completely unaware of the gap. This guide sets out exactly how FBAR signature authority works, where the genuine exceptions sit, and what to do when the reports are already late.
Understanding FBAR Signature Authority Under US Law
FBAR signature authority exists whenever you can control the disposition of money in a foreign financial account by communicating directly with the institution holding it. Ownership is irrelevant. Notably, the test focuses entirely on control, and it applies whether or not you ever exercise that control.
What FBAR Signature Authority Actually Means
The definition sits in the Bank Secrecy Act regulations at 31 CFR 1010.350. Signature or other authority means the authority of an individual to control the disposition of money, funds or other assets held in a financial account by direct communication to the person with whom the account is maintained. Accordingly, FBAR signature authority arises from the mandate the bank holds, not from the share register.
Two points matter enormously here. Firstly, the phrase "or other authority" widens the net well beyond people who physically sign anything. Secondly, authority exercised jointly with another person still counts. Therefore, a two-signature mandate requiring dual authorisation creates a reporting duty for both signatories, not for neither.
The IRS guidance on foreign account reporting confirms the position plainly. You must file if you hold a financial interest in, or signature or other authority over, at least one foreign financial account. Consequently, the two routes are entirely independent of each other.
Signature Authority Versus Financial Interest
Financial interest means ownership, whether direct or indirect. FBAR signature authority means control without ownership. Importantly, a single account can generate both, and many accounts do.
The distinction drives what you actually report. When you hold a financial interest, you report the account and you must retain the underlying records for five years. When you hold FBAR signature authority only, you report the account in a separate part of the form, and the record-keeping duty falls on the account owner instead. The FinCEN guidance on corporate account reporting sets out this split clearly.
Why the $10,000 Threshold Aggregates Everything
The threshold traps more people than the definition does. You must file when the aggregate maximum value of all your foreign financial accounts exceeds $10,000 at any point in the calendar year. Crucially, that aggregate combines accounts you own with accounts you merely control.
Consider the arithmetic. A US executive with £6,000 in a personal UK current account sits comfortably below the threshold on their own money. However, adding FBAR signature authority over a company account holding £3 million pushes the aggregate far past $10,000. Therefore, the personal account becomes reportable too, purely because of the signatory role.
The test uses the highest balance during the year, not the year-end balance. Furthermore, you convert using the Treasury year-end exchange rate. Accordingly, a single large transaction passing through a corporate account in March can create a filing duty even if the balance sat near zero every other day.
Where FBAR Signature Authority Catches Americans in Britain
The UK produces more of these situations than most jurisdictions, largely because of how British companies and professional structures operate. Additionally, the density of US citizens in senior London roles multiplies the exposure.
The UK Limited Company Director
A US citizen who directs a British company almost always holds bank mandate authority. Running a UK limited company practically requires it. Consequently, FBAR signature authority attaches from the moment the mandate is registered, regardless of shareholding.
This catches two distinct groups. Owner-managers hold both a financial interest through their shares and signature authority through the mandate. Meanwhile, salaried directors of companies they do not own hold signature authority alone. Notably, the second group is far more likely to miss the filing, because nothing about the arrangement feels like their money.
Company secretaries and finance directors face identical exposure. Similarly, a US citizen who holds the mandate on a dormant UK subsidiary must still report if the aggregate threshold is met elsewhere.
Partners, Members and Professional Practices
Designated members of a UK limited liability partnership routinely hold firm account mandates. So do equity partners in professional practices. Therefore, FBAR signature authority applies across law firms, asset managers, surveyors and consultancies throughout the City.
Client account mandates deserve particular attention. A US-citizen partner with authority over a firm's client money account controls a foreign financial account, even though the funds belong to clients. Consequently, the reporting duty exists regardless of whose money sits in the account.
Family Accounts and Powers of Attorney
Family arrangements generate the most emotionally difficult conversations we have. An American who holds a power of attorney over an elderly parent's UK account holds FBAR signature authority over it. Likewise, being added to a sibling's account for convenience creates the same duty.
Joint accounts sit differently again. A joint account with a non-US spouse usually creates a financial interest, not merely signature authority. However, where a US citizen is added purely as a convenience signatory without beneficial entitlement, the position becomes signature authority alone. Accordingly, the analysis turns on the beneficial ownership, not the account title.
Adult children managing a parent's finances face this constantly. Moreover, FBAR signature authority persists for as long as the mandate exists, even if the American never touches the money.
The Exceptions Most Filers Get Wrong
Genuine exceptions exist. However, they are far narrower than the internet suggests, and they almost never help the private company owner.
The Regulated and Publicly Traded Employer Exception
The regulations exempt officers and employees of certain federally regulated entities from reporting FBAR signature authority over employer-owned accounts. Banks examined by the federal banking agencies qualify. Additionally, entities registered with the SEC or CFTC qualify, as do US companies with securities listed on a national exchange.
The relief only applies where the individual holds no financial interest in the account. Furthermore, it covers the employer's accounts and those of US subsidiaries included in a consolidated FBAR filed by the parent. The IRS Internal Revenue Manual at 4.26.16 sets out the categories in detail.
Why Foreign Subsidiaries Fall Outside the Relief
Here sits the trap that catches senior London executives. The exception does not extend to foreign accounts owned by foreign subsidiaries of covered entities. Therefore, an American officer of a US-listed group who signs on the UK subsidiary's own bank account reports that account personally.
The second gap matters equally. Signature authority over an account owned by any entity other than the employer falls outside the relief entirely. Consequently, a US executive who also directs an unrelated private company reports that mandate without exception. In our experience, this combination — exempt day job, non-exempt side directorship — produces more missed filings than any other fact pattern.
The Record-Keeping Relief That Does Apply
One useful relief applies broadly. An officer or employee who files to report FBAR signature authority over an employer's foreign account need not personally retain records for that account. Instead, the employer keeps them.
The employer may also file on the employee's behalf. Where employees provide documented authority, the company can submit the reports through BSA E-Filing. Nevertheless, the legal duty stays with the individual. Therefore, an executive who assumed the employer filed for them remains personally liable if nothing was submitted.
The FinCEN Deadline Extension That Probably Excludes You
Considerable confusion surrounds the long-running deadline extension for signature authority filers. Many wealthy Americans assume it covers them. Usually, it does not.
What FinCEN Notice 2025-1 Actually Says
In December 2025, FinCEN extended the filing date to 15 April 2027 for certain individuals with signature authority but no financial interest in foreign accounts. Remarkably, this was the sixteenth consecutive annual extension since 2011. The extension exists because the 2016 proposed regulations revising FBAR signature authority reporting were never finalised.
Why Private Company Owners Receive No Extension
The extension applies only to employees and officers of the same regulated and publicly traded entities described above. Consequently, it tracks the exception rather than expanding it. A US citizen directing their own UK trading company receives nothing from this notice.
The practical consequence is stark. Two Americans can hold apparently identical FBAR signature authority over UK corporate accounts, yet face deadlines two years apart. Therefore, identifying which category applies is the first step in any review, not an afterthought.
The Standard Deadline for Everyone Else
For all other filers, the calendar year 2025 report was due on 15 April 2026, with an automatic extension to 15 October 2026. You need not request that extension, and no form exists to claim it. Accordingly, the practical deadline for most wealthy Americans in Britain is October, and the calendar year 2026 report follows the same pattern in 2027.
Reporting Signature Authority on FinCEN Form 114
Mechanics matter, because the form separates the two categories deliberately.
Part IV and the Information Required
Accounts subject to FBAR signature authority alone go in Part IV of FinCEN Form 114, not Part II. You supply the institution name and address, the account number, the maximum value during the year, and the name and address of the account owner. The FinCEN line item filing instructions specify each field.
Obtaining the owner's details is where corporate filings stall. Consequently, we recommend requesting a signatory schedule from the company secretary well before April. Additionally, the maximum value should come from the bank's own records rather than management accounts.
The Twenty-Five Account Simplification
Where you hold FBAR signature authority over twenty-five or more accounts, you may report the number of accounts and basic identifying details rather than completing full entries. However, you must maintain the detailed records and produce them on request. Therefore, the simplification reduces the form, not the underlying work.
Filing Through BSA E-Filing
All reports go electronically through the FinCEN system. Furthermore, a spouse cannot be included on your report where FBAR signature authority is involved, so separate filings are required. The IRS summary of foreign account reporting confirms the electronic filing requirement.
Penalties and Correcting Missed Filings
Exposure is genuinely serious, and the arithmetic compounds across years.
The 2026 Penalty Position After Bittner
Failing to report FBAR signature authority attracts a non-willful penalty of up to $16,536 per report for 2026, following annual inflation adjustment. Critically, the Supreme Court held in Bittner v. United States that this penalty applies per annual report rather than per account. Consequently, a filer who missed eight accounts in one year faces one penalty, not eight.
Willful violations remain far worse. The penalty reaches the greater of roughly $165,000 or 50% of the account balance at the time of the violation, assessed for each year. Moreover, criminal exposure extends to fines of $500,000 and imprisonment. The congressional research summary of FBAR penalties traces the statutory framework.
Correction Routes After the July 2026 Change
The landscape shifted materially this year. On 1 July 2026, the IRS removed the Delinquent FBAR Submission Procedures from its website without announcement, eliminating the administrative route that guaranteed no penalty for late reports where all income had been declared. Therefore, no guaranteed penalty-free path now exists for a standalone late FBAR.
Two routes remain viable. Where unreported income accompanies the missed reports, the IRS Streamlined Filing Compliance Procedures continue to operate, and the foreign offshore version carries no miscellaneous penalty for qualifying non-residents. Alternatively, where income was fully declared, filers now submit the late reports with a reasonable cause statement, relying on the underlying provisions that survive in the Internal Revenue Manual. Notably, our IRS Streamlined Filing service assesses which route fits before anything is submitted.
Why Quiet Amendments Fail
Some filers simply submit corrected reports and hope. However, an amended report without an explanation flags the earlier omission while offering no mitigation. Consequently, the filer surrenders the reasonable cause argument they might otherwise have made. We never recommend this approach for FBAR signature authority corrections.
Case Study: A London Executive With Four Signatory Roles
A worked example demonstrates how quickly exposure accumulates.
The Position Before Review
Marcus, a US citizen and managing director at a privately held London asset manager, approached us in early 2026. He had filed FBARs faithfully for eight years, reporting his personal UK current account with a peak balance of £48,000 and a savings account peaking at £310,000. His US tax return preparation was accurate, and he had declared every penny of UK income.
However, he held four signatory mandates he had never considered reportable. He signed on his employer's UK operating account, which peaked at £4.2 million. He directed a small UK consultancy company, whose account peaked at £186,000. Additionally, he held a power of attorney over his mother's UK account, peaking at £92,000. Finally, he was a signatory on a UK sports club account holding £31,000.
The Corrected Position
Our review confirmed that all four mandates created FBAR signature authority. The employer exception did not apply, because the firm is privately held rather than publicly traded. Consequently, the FinCEN extension to April 2027 did not apply either, and every report was already late.
We identified six years within the relevant period where reports had omitted Part IV entirely. Maximum non-willful exposure therefore reached $99,216, calculated as six annual reports at $16,536 each. Marcus had no unreported income, so the streamlined route was unavailable and inappropriate.
The Outcome
We prepared six corrected reports listing all four mandates in Part IV, supported by a detailed reasonable cause statement. That statement documented his consistent income reporting, his reliance on the account-ownership framing in his previous filings, and his immediate correction on discovering the error. Furthermore, we obtained written signatory schedules from all four institutions to evidence the maximum values.
The submission was accepted without penalty assessment. Ultimately, the cost of correcting his FBAR signature authority position was a fraction of one year's exposure. Marcus now files a consolidated signatory schedule each January before the reporting season begins.
How TaxYork Can Help
We specialise in FBAR signature authority reviews for wealthy Americans and business owners across Britain. Our team maps every mandate a client holds before a single form is prepared, because the aggregate cannot be tested until the full picture exists.
Our FBAR and FATCA compliance service handles current-year reporting and historic correction alike. Additionally, our US tax return preparation for expats ensures the return and the report tell a consistent story, which matters enormously when reasonable cause is in play. Where treaty positions or corporate structures complicate matters, our cross-border tax planning team and tax treaty optimisation specialists work alongside the compliance function.
We act for investment bankers, fund principals, company owners and dual nationals who need this done precisely and discreetly. Moreover, we coordinate directly with UK accountants and HMRC filings so that both sides of the Atlantic align.
Conclusion
FBAR signature authority turns control into a reporting duty, and control is far easier to acquire than ownership. A directorship, a partnership mandate or a parent's power of attorney each creates the obligation independently. Consequently, wealthy Americans in Britain frequently hold three or four reportable roles without recognising a single one.
The exceptions help employees of regulated and publicly traded groups, and almost nobody else. Furthermore, the FinCEN extension to April 2027 follows the same narrow boundary. Therefore, private company owners and partners face the ordinary October deadline with no relief whatsoever.
Correction remains achievable, but the route changed on 1 July 2026. Since the Delinquent FBAR Submission Procedures disappeared, late reports demand a properly constructed reasonable cause position rather than a routine submission. Above all, review every mandate you hold now, before a report becomes another year late.
Contact Us
If you hold signatory roles over UK company or family accounts, we will map your full reporting position and tell you precisely what is outstanding. Please contact us to discuss your circumstances in confidence, or book a consultation with our cross-border team.
Email hello@taxyork.com or telephone 020 3488 8606. We respond to every enquiry within one working day, and initial reviews of FBAR signature authority exposure are conducted before any engagement is agreed.
Disclaimer
This article provides general information on FBAR signature authority and US-UK reporting obligations. It does not constitute tax advice for any individual circumstance, and you should not act upon it without obtaining professional guidance specific to your position. Tax legislation, thresholds and penalty amounts change frequently, and the figures cited reflect the position as at July 2026. TaxYork accepts no liability for any action taken or omitted in reliance on this article. Please seek formal engagement before making decisions regarding your reporting obligations.