Missed US Tax Returns After UK Accountant Advice: Catch Up

If your UK accountant told you that paying HMRC meant no US filing was needed, you probably still have missed US tax returns and FBARs to deal with. US citizens file on worldwide income wherever they live. Most long-term UK residents who relied on that advice in good faith can catch up penalty-free through the Streamlined Foreign Offshore Procedure.

This guide is for a particular kind of reader. You hold US citizenship, often alongside a British passport. You have lived in the UK for many years. A competent UK practitioner has filed your Self Assessment every January. At some point you asked whether America needed anything from you, and you were told no: the treaty covers it, or you pay more tax here than you would there, or the IRS has no interest in someone who lives abroad. Then a bank asked you to self-certify under FATCA, a US brokerage closed your account, or a colleague mentioned the FBAR. Now you want to know what happens next. At Jungle Tax we prepare these catch-up filings for UK-resident Americans every week. Below we set out why the advice was wrong, how your reliance on it is likely to be treated, what to gather, and exactly what the catch-up pack contains.

Why was the advice wrong if you already pay UK tax?

The United States taxes on citizenship, not residence. Almost every other country, the UK included, taxes people because they live there. A UK practitioner trained entirely within the HMRC system naturally reasons from residence. If you are UK resident, they report your worldwide income to HMRC, claim relief for any foreign tax, and consider the job done. That is the right answer for a British client with no US connection. It is the wrong answer for a US citizen, because the Internal Revenue Code requires every citizen whose gross income exceeds the filing threshold to file Form 1040 every year, wherever they live and however much tax they pay elsewhere.

Paying UK tax decides how much US tax you owe, which is usually little or nothing once foreign tax credits are claimed. It does not decide whether you must file. The duty to file and the liability to pay are separate questions. The common advice merges them, and that is how a high earner paying 45% UK income tax ends up with a decade of unfiled US returns while owing the IRS almost nothing.

The three versions of the advice we see most often

• "The treaty means you only pay tax in the UK." This misreads the US-UK income tax treaty, as explained below.
• "You pay more tax here, so there is nothing to pay there." Often true about the liability, but irrelevant to the filing obligation. It also ignores the FBAR and Form 8938, which are disclosure regimes and apply whatever tax you owe.
• "US tax is not something we deal with." In fairness to the adviser, this one is accurate, but it is not the same as being told no return is due. How the conversation actually went matters a great deal later, as we explain in the section on non-wilfulness.

How does the saving clause in the US-UK treaty work?

The 2001 US-UK income tax treaty decides which country may tax particular types of income and how double taxation is relieved. Like nearly every US treaty, it contains a saving clause in Article 1. In general terms, the saving clause lets Washington keep taxing an American in London almost exactly as it would without any treaty, carving out only a short list of specific exceptions. So the residence-based reliefs a UK practitioner might expect a treaty to give, such as exempting a UK resident from foreign tax on certain income, generally do not protect a US citizen from US tax.

The clause has listed exceptions. Some provisions apply to citizens anyway: notably the double tax relief article and certain pension provisions, which can, for example, let UK pension growth and some contributions be treated favourably for US purposes. These exceptions shape how your US return is calculated. None of them removes the obligation to file a return. A treaty position that changes your US tax normally has to be claimed on a filed return, often with a disclosure statement on Form 8833. A UK accountant who said "the treaty covers it" may have been right that the treaty limits the tax. They were wrong that it limits the filing.

Does relying on your UK accountant make you non-wilful?

The Streamlined Foreign Offshore Procedure (SFOP) is available only where the failure to file, report income or submit FBARs resulted from non-wilful conduct. The IRS describes that as conduct due to negligence, inadvertence or mistake, or conduct that results from a good-faith misunderstanding of the law. Reliance on a professional who told you no US filing was needed is one of the most common, and most credible, foundations for that position. It is not automatic, though, and it has limits worth understanding before you start.

What strengthens reliance on adviser advice

• You told the adviser you were a US citizen. Advice given with knowledge of your citizenship is far more persuasive than advice given in ignorance of it.
• You asked the question, and got an answer. An email in which you ask about US obligations and are told none apply is the clearest kind of evidence.
• The adviser held themselves out as competent. A qualified practitioner, engaged over many years, who appeared to understand your affairs.
• Your behaviour was consistent with honesty. All UK income and accounts were declared to HMRC, nothing was hidden, and you acted promptly once you learned the truth.

Where reliance runs out

• The adviser never knew you were American. If your citizenship never came up, you were not relying on advice about US filing. That does not make you wilful, since many people simply did not know, but the facts are different and must be presented as they are.
• You were never actually told anything about US filing. Silence from a UK accountant who was engaged only for UK work is not advice. Many people later remember "my accountant said it was fine" when the honest version is "nobody raised it". Be precise with yourself about which it was.
• Contrary signals were ignored. Letters from the IRS, a US bank's FATCA questionnaire you answered untruthfully, or a previous adviser who did tell you to file all weaken the position considerably.
• Selective disclosure. If the adviser saw only part of your financial life, say UK salary but not the US brokerage account or the offshore fund, then the advice covered only what they saw.
• Sophistication. The IRS weighs your education and financial experience. A senior executive or founder is expected to have asked sensible questions. Reliance remains available, but it is judged in context.

The Form 14653 certification asks for specific facts, and where you relied on a professional it asks for details of that adviser and a summary of the advice. You certify those facts under penalty of perjury. This guide deliberately does not cover drafting the narrative. That is a separate, careful exercise. What matters now is that the narrative can only be as strong as the evidence beneath it, which is why gathering comes first.

What evidence should you gather before filing?

Start building the file before anyone prepares a single return. The aim is a contemporaneous record of what you said, what you were told, and what the adviser had in front of them.

• Engagement letters for every year the UK firm acted. Note the scope. Did it mention US tax, exclude it, or say nothing?
• Emails and letters in which US filing, the treaty, FATCA, or your citizenship were discussed. Search your inbox for "IRS", "US tax", "treaty", "FBAR", "American", "passport" and "1040".
• Client onboarding forms and questionnaires, which often record nationality.
• Meeting notes or diary entries recording conversations where the topic came up.
• Copies of every UK return the adviser filed, with the supporting schedules and tax computations.
• Anti-money-laundering identity documents you supplied. A US passport in the adviser's file shows they knew.
• Bank and brokerage FATCA self-certifications, and how you answered them.
• Any IRS correspondence, even years old.

It is entirely reasonable to write to the former adviser and ask for a copy of your file. Do so factually and without accusation. Your objective at this stage is compliance, not a dispute, and a cooperative former adviser is a far better source of records.

What does the Streamlined catch-up pack contain?

For a US citizen living in the UK who qualifies, the IRS Streamlined Foreign Offshore Procedures require a defined package. Full details of the overall programme are on the Streamlined Filing Compliance Procedures page.

Eligibility checks first

• Non-residency test. In at least one of the three most recent years whose return due date has passed, you had no US abode and were physically outside the United States for at least 330 full days. For joint filers both spouses must meet it. Long-term UK residents almost always qualify.
• A valid taxpayer identification number. US citizens need a Social Security Number. Accidental Americans who never obtained one must apply first, and this is often the longest lead-time item.
• No IRS examination or investigation already under way for any year.
• Non-wilful conduct, as discussed above.

The package itself

1. Three years of US federal returns. Form 1040 for each of the three most recent tax years whose due date (including extensions) has passed, with every required schedule and information return: Form 1116 for foreign tax credits, Form 2555 if the foreign earned income exclusion is used, Form 8938 where thresholds are met, Form 5471 for UK companies you control, Form 8621 for UK funds treated as passive foreign investment companies, and Form 8833 for treaty positions.
2. Six years of FBARs. FinCEN Form 114 for each of the six most recent years whose due date has passed, filed electronically through the BSA E-Filing System, with the late-filing reason recorded as relating to the Streamlined procedures. See the IRS FBAR guidance.
3. Form 14653. The signed non-wilfulness certification covering both the returns and the FBARs.
4. Payment of any tax and interest shown on the three returns. For most UK residents this is small or nil, but not always. UK ISA income and gains, US-source dividends and rental income, and investment income taxed at lower UK rates can all leave a residual US liability.
5. Correct labelling and submission exactly as the current IRS instructions require. Errors in presentation are a frequent reason for packages being processed as ordinary late returns.

Where the procedure is followed correctly, taxpayers who qualify are not subject to failure-to-file, failure-to-pay, accuracy-related, information return or FBAR penalties for the covered years. Unlike the domestic version of the programme, the foreign version carries no miscellaneous offshore penalty. Our FBAR penalty calculator shows the exposure the procedure removes.

Why only three and six years?

Older years are not formally forgiven, but in practice the IRS accepts the defined look-back for compliant Streamlined submissions. Be aware that the US assessment period on an unfiled year never starts, and that missing international information returns such as Forms 5471 and 8938 can hold the statute open. That is one reason why getting the three covered years complete matters more than speed.

Were the UK returns themselves complete?

This is the step generalist guides miss entirely. If your UK accountant misunderstood your US position, ask whether they also misunderstood your US assets. Preparing three years of US returns means reconciling every account and income stream, and that exercise often reveals gaps on the UK side too.

Common UK-side omissions for US citizens

• US-source income. Dividends from a US brokerage, interest on a US savings account, rent from a property in the States, or US-sourced consulting fees. A UK resident is taxable on worldwide income. The US tax withheld is usually creditable in the UK, but the income must still be declared.
• US accounts not declared. A legacy checking account, a 529 plan or a dormant US brokerage account sitting quietly for years.
• Gains on US securities, computed in sterling under UK share-pooling rules, which can produce a different gain from the US figure.
• Remittance basis history. Earlier claims made by long-term residents, and the transition after the remittance basis was abolished from 6 April 2025, need checking against the foreign income actually received.
• US mutual funds and ETFs. These are typically non-reporting funds for UK purposes, so disposal gains may be taxable as income rather than capital gains in the UK.

Correcting the UK side

Within the normal amendment window you can amend a Self Assessment return directly. Beyond that, offshore omissions are usually corrected through HMRC's Worldwide Disclosure Facility. HMRC can generally assess up to 4 years back for innocent errors, 6 years for careless ones and 20 years for deliberate behaviour, with a 12-year window for careless offshore matters in many cases. An honest reliance on a professional adviser is relevant to whether an error was careless, so the evidence you gathered for the IRS also supports the UK position. Our UK tax services team handles the HMRC side alongside the US filings, so both narratives stay consistent.

How do the US and UK fixes fit together?

Sequencing matters. We generally recommend this order:

1. Diagnose. List every year, account, entity and income stream across both countries. Confirm citizenship status, SSN and non-residency eligibility.
2. Gather evidence on the adviser relationship as described above.
3. Quantify the UK position for the three US return years, since the UK tax actually paid drives your US foreign tax credits.
4. Correct any UK omissions. An amended UK figure changes the creditable tax in your US returns, so finalise the UK numbers before the US ones where possible.
5. Prepare the US returns and FBARs, using the corrected UK figures and treaty positions.
6. Finalise Form 14653 on the basis of the facts established.
7. Submit, then stay compliant. File every subsequent year on time. A Streamlined submission is a one-time remedy, and future compliance is what closes the matter.

Currency is a frequent trap. US returns are in dollars and UK returns in sterling, and foreign tax credits are computed on US principles, including the separate passive and general income categories. Our cross-border tax team reconciles both sets of figures line by line so that the two jurisdictions see a consistent picture.

What if Streamlined is not the right fit?

• Returns were filed but FBARs were not. If you have been filing US returns and reporting all income, the Delinquent FBAR Submission Procedures may be simpler.
• Only international information returns were missed on otherwise filed returns. The Delinquent International Information Return Submission Procedures, with a reasonable-cause statement, may apply.
• The facts suggest wilfulness. If you were told to file and chose not to, or concealed assets from the adviser, Streamlined is the wrong route. The IRS Criminal Investigation Voluntary Disclosure Practice exists for that case, and specialist legal advice comes first.
• You are considering renunciation. Catching up is usually required anyway, because the expatriation rules require certification of five years of compliance.

What does this cost a high-net-worth household?

The tax is often modest. The professional work is not trivial, because the complexity sits in the information returns: UK companies, ISAs holding funds, UK pensions, share schemes and property. Non-wilful FBAR penalties outside the programme can run to a five-figure sum per report. The Supreme Court's 2023 decision in Bittner, which held that the penalty applies per report rather than per account, limits that exposure but does not remove it. Against that, a correctly prepared Streamlined package for a complex UK-resident family is a sound investment. See our high-net-worth service for how we scope these engagements.

Next steps

• Stop relying on the old advice. Do not file the next US year in isolation, as a lone current-year return can complicate the catch-up.
• Request your file from the former UK adviser and start your evidence search.
• Confirm you hold a valid SSN.
• List every non-US account with a maximum balance for each of the last six years.
• Book a diagnostic review that covers both the US and UK positions together.

Discovering that a trusted adviser gave you the wrong answer is unsettling, but it is one of the most common and most fixable situations we see. If years of UK returns have left you with missed US filings, contact our cross-border team for a confidential consultation. We will map your eligibility, the evidence you hold, and the complete US and UK catch-up pack before anything is filed.