Accidental American With No CLN: The US Tax Years Still Run

An Accidental American who became British years ago and assumed US citizenship ended there is, for US tax purposes, almost certainly still a US citizen. Until the State Department has documented the loss and the IRS has received Form 8854, the filing years keep running: returns, FBARs and Form 8938 for every intervening year.

This is one of the most expensive assumptions we see among internationally mobile families and founders. The client swore allegiance at a British citizenship ceremony in the 1990s or 2000s, let the US passport lapse, and has not thought about the United States since. Then a UK private bank asks for a Certificate of Loss of Nationality, or a transaction requires a US tax status declaration, and nobody can produce the document. At Jungle Tax we prepare the US and UK returns that put those years right. This guide explains why the obligation never stopped, what the back years contain, and the order in which the work has to be done.

Why does US tax citizenship survive a foreign naturalisation?

Because nationality law and tax law ask two different questions. Nationality law asks whether a person performed a potentially expatriating act voluntarily and with the intention of giving up US nationality. Tax law asks something much narrower and more mechanical: has one of four documented events happened yet?

The IRS sets those events out on its expatriation tax page. A citizen is treated as relinquishing US citizenship on the earliest of:

• the date the individual renounces US nationality before a US diplomatic or consular officer, provided the State Department later confirms the renunciation by issuing a Certificate of Loss of Nationality;
• the date the individual furnishes to the State Department a signed statement of voluntary relinquishment confirming an earlier expatriating act, again provided a Certificate of Loss of Nationality is later issued;
• the date the State Department issues a Certificate of Loss of Nationality; or
• the date a US court cancels a naturalised citizen's certificate of naturalisation.

Read the list again with a 1998 British naturalisation in mind. None of the four dates is "the day you took the oath". Three of them require the State Department to have been involved, and the fourth requires a US court. A private act, however sincere, that was never taken to a US consulate does not appear on the list at all.

The notification rule: both the State Department and the IRS

The same IRS page states the consequence directly. Individuals who have not notified both the State Department and the IRS, the latter on Form 8854, continue to be treated as US citizens for US tax purposes. That principle was written into section 7701(n) of the Internal Revenue Code for expatriations after 3 June 2004, and for expatriations on or after 17 June 2008 the four-date rule above produces the same practical result. The effect for a wealthy British resident is blunt: with no Certificate of Loss of Nationality and no Form 8854, the IRS position is that you remained a US citizen throughout, taxable on worldwide income and subject to every US information-reporting rule.

What we will not tell you

Whether your particular act, whether a naturalisation, an oath of allegiance, service in a foreign government post or anything else, was in law a relinquishment of US nationality is not a tax question. It is a matter for the State Department and for qualified nationality-law counsel, and nothing in this guide is advice on it. The treatment of acts performed before June 2004 is a particularly fact-sensitive area on which counsel should be consulted before any filing position is taken. Our role is the tax preparation that sits around that determination: establishing what was required, preparing it accurately, and filing it in the right order.

What is a Certificate of Loss of Nationality, and what does it actually prove?

The Certificate of Loss of Nationality, usually shortened to CLN, is the State Department's formal record that a person is no longer a US national. It is prepared by a consular officer following an appointment at a US embassy or consulate and only takes effect once approved by the State Department. For a person relying on a historic act, the consular process involves a questionnaire about the act and the intention behind it, followed by a signed statement of voluntary relinquishment.

Three features of the certificate matter for tax:

• It is evidence, not the event. For nationality purposes the certificate may record the date of the original act, which could be decades ago. That recorded date is not automatically the date on which US tax citizenship ended.
• The tax date is usually the consulate date. For someone relying on an earlier act, the relevant tax date under the four-date rule is generally the day the signed statement was furnished to the State Department, provided the certificate is later issued. In other words, the tax clock typically stops on the day of the appointment, not on the day of the ceremony years earlier.
• The IRS issues nothing equivalent. There is no IRS certificate confirming that you have left the US tax system. The only tax-side document is the one you file: Form 8854.

The mismatch is the heart of the problem. A certificate can say that nationality was lost in 1998 while the tax rules treat the same person as a US citizen until an appointment in 2026. Every calendar year between those two dates is a US filing year.

What do the intervening years look like?

For each year in which you were treated as a US citizen and your income exceeded the filing threshold, a federal income tax return was due on worldwide income. For a UK-resident executive or founder that means UK salary, bonuses and share awards, dividends from a UK company, rental income, interest, and gains on UK and other non-US assets. Alongside the return sit the information filings, which carry their own penalties regardless of whether any tax was owed.

Filing	What triggers it	Where the exposure usually sits for a UK resident
Form 1040 (annual income tax return)	Worldwide gross income above the annual filing threshold	UK employment and investment income; UK tax paid is normally credited, but only on a filed return
FBAR (foreign bank account report)	Aggregate non-US account balances above $10,000 at any point in the year	Every UK current, savings, brokerage and pension account; joint accounts and signature authority over company accounts
Form 8938 (specified foreign financial assets)	For a single filer living abroad, more than $200,000 at year end or $300,000 at any time; double for joint filers	Investment portfolios, UK pension interests, shareholdings in private companies
Form 8621 (passive foreign investment companies)	Holding non-US pooled funds	UK unit funds, investment funds and exchange-traded funds, including those held inside an ISA
Form 5471 (foreign corporations)	Significant ownership or control of a non-US company	Founders and directors holding shares in their own UK limited company

Two points tend to surprise sophisticated readers. First, there is no time limit running in your favour on a year for which no return was ever filed; the period in which the IRS can assess tax generally does not begin until a return is on file. Secondly, the US does not recognise the tax-free status of an ISA. Income and gains sheltered from HMRC are fully reportable to the IRS, and the funds inside the wrapper frequently bring Form 8621 with them. Details of the thresholds are on the IRS page for Form 8938, and you can model the non-willful and willful FBAR exposure with our FBAR penalty calculator.

Does that mean decades of US tax are owed?

Usually not, and it is important to keep the problem in proportion. A UK resident on higher and additional rates has generally paid more UK income tax than the US would have charged on the same income, and the foreign tax credit, claimed on Form 1116, typically absorbs most or all of the US liability on earned and investment income. The US-UK double taxation convention adds further protection, including on UK pension contributions and growth. The exposure for most wealthy accidental Americans is therefore not the tax itself. It is the missing forms, the fund holdings that the foreign tax credit does not neatly cover, the US net investment income tax, and above all the consequences for expatriation of not being able to certify compliance.

How do the US and UK positions compare?

Issue	United States (IRS)	United Kingdom (HMRC)
Basis of taxation	Citizenship: worldwide income wherever you live, until a documented relinquishment	Residence: worldwide income while UK resident under the statutory residence test
Effect of becoming British	None for tax until the State Department and the IRS have both been notified	None in itself; nationality does not determine UK tax liability
Tax year	Calendar year	6 April to 5 April
ISAs	Fully taxable and reportable; funds inside may be passive foreign investment companies	Income and gains exempt
UK registered pensions	Reportable on FBAR and Form 8938; treaty positions normally claimed on the return	Relief on contributions and tax-deferred growth within limits
Account reporting	Self-reported annually by the individual on FBAR and Form 8938	UK banks identify US indicia and request a self-certification; reportable accounts pass to HMRC and on to the IRS
Proof that status has ended	Certificate of Loss of Nationality plus Form 8854	Not applicable; residence is determined year by year

HMRC's own explanation of when UK residents are taxed on overseas income is in its guidance on tax on foreign income and UK residence, and the text of the US-UK double taxation convention is published on gov.uk. The cross-border trap is that the two systems each look complete on their own. A client with immaculate UK self assessment returns, prepared by a capable UK adviser, can have twenty unfiled US years sitting quietly behind them.

Why UK banks are usually the trigger

UK financial institutions are required to look for US indicia, most obviously a US place of birth, and to ask the account holder to certify their status. A person born in the United States who says they are no longer a US citizen will typically be asked for the Certificate of Loss of Nationality or a reasonable written explanation of why they do not have one. For a private banking client, an answer that cannot be evidenced tends to lead to a reportable account, restricted services or a request to move the relationship. We cover that correspondence in our guide to UK bank self-certification requests.

Why does the catch-up come before the consulate appointment?

Because of the third limb of the covered expatriate test. The IRS treats an expatriating citizen as a covered expatriate, and therefore within the exit charge regime, if any one of three conditions is met:

• average annual net income tax liability for the five years before expatriation above the inflation-adjusted threshold, which the IRS lists as $206,000 for 2025 (the published table currently stops at that year, so confirm the figure for the year you actually expatriate);
• net worth of $2 million or more on the date of expatriation; or
• failure to certify on Form 8854, under penalties of perjury, that you have complied with all US federal tax obligations for the five tax years preceding the date of expatriation.

The third limb is the one that catches the accidental American who thought the matter closed years ago. A person with modest US-source income and net worth below the threshold still becomes a covered expatriate if the five preceding years are not clean. And a person whose net worth is already above $2 million, as many of our clients are, still needs the certification to be true, because Form 8854 is signed under penalties of perjury and a $10,000 penalty may be imposed for failing to file it when required.

Sequence is everything. If the signed statement is furnished to the State Department before the back years are filed, the tax expatriation date is fixed on that day and the five-year window is locked in as five years of non-compliance. Filing afterwards can repair the returns, but it leaves you making a certification about a period that was not compliant when the date was set, and that is a position to be avoided. The clean route is to complete the filings first, then attend the appointment. We do not re-explain the exit charge here; the mechanics are in our guides to the US exit tax for UK residents and to the five compliant years behind Form 8854.

How is the catch-up sequenced?

For a UK resident whose failure to file was non-willful, the usual vehicle is the IRS Streamlined Foreign Offshore Procedures, described on the IRS page for US taxpayers residing outside the United States. The work runs in a fixed order.

Step 1: Establish the facts and the legal position

Assemble the nationality history: US birth certificate or naturalisation papers, the British naturalisation certificate, every US passport ever held and the dates it was used, and any correspondence with a US consulate. Nationality-law counsel then advises on whether a relinquishment claim is supportable or whether a fresh renunciation is the appropriate route. We need that conclusion, but we do not form it.

Step 2: Rebuild the income and asset record

We reconstruct calendar-year income from UK self assessment returns, P60s and P11Ds, share scheme statements, dividend vouchers, completion statements and annual account statements, then convert it from the UK tax year into the US calendar year and into dollars. For FBAR purposes we need the highest balance of every non-US account in each of the last six years, including accounts since closed.

Step 3: File the streamlined submission

The streamlined submission consists of the three most recent years of delinquent returns with all required information returns, six years of FBARs filed electronically, and a signed non-willful certification on Form 14653 explaining in your own factual narrative why the filings were missed. To qualify for the foreign offshore version, a citizen must have had no US abode and been physically outside the United States for at least 330 full days in at least one of the three years. Where the conditions are met, the IRS does not apply failure-to-file, failure-to-pay or accuracy-related penalties, and no FBAR penalties, to the years covered.

The narrative deserves care. "I became British in 1998 and believed my US citizenship ended that day" is a coherent account of a good-faith misunderstanding of the law, which is precisely what non-willful conduct means. It must also be consistent with what you tell the State Department. A statement to the consulate that you intended to give up US nationality in 1998 and a certification to the IRS explaining your filing history are two tellings of the same facts, and they should be prepared with sight of each other.

Step 4: Close the gap between three years and five

This is the step generalist commentary misses. The streamlined procedures cover three years of returns. The Form 8854 certification covers five. A streamlined filing alone therefore does not support the certification. The two earlier years also have to be compliant, which in practice means preparing and filing five years of returns and information returns, or sequencing the consulate appointment so that the five-year window is fully covered by filed returns. Which years fall inside the window depends on the calendar year in which the appointment takes place, so the appointment date should be chosen with the filing calendar in front of you.

Step 5: Attend the consulate, then file the final-year return and Form 8854

Once the five preceding years are on file, the appointment can take place. The year of expatriation is then a split year: a dual-status return reporting worldwide income as a US citizen up to the expatriation date and US-source income only thereafter, with Form 8854 attached and filed by the due date of that return. Form 8854 carries the five-year certification, the net worth statement and the income tax liability figures for the five preceding years. Only when it has been filed has the IRS been notified, and only then is the second half of the notification rule satisfied.

Are the IRS relief procedures for former citizens an alternative?

For most wealthy readers, no. The IRS Relief Procedures for Certain Former Citizens allow some people with no US filing history to come into compliance without paying the tax for the six years involved, but the conditions are narrow: relinquishment after 18 March 2010, net worth below $2 million both at expatriation and at the time of submission, aggregate tax of $25,000 or less across the six years, and non-willful conduct. A Certificate of Loss of Nationality must be included with the submission, so the procedure is used after the appointment, not instead of it. We explain why the net worth condition excludes most high-net-worth applicants in our guide to the relief procedures net worth gate.

What are the common mistakes?

• Booking the consulate first. The appointment fixes the tax date. Booked before the filings, it fixes five non-compliant years.
• Treating the nationality date as the tax date. A certificate recording a historic act does not by itself erase the tax years between that act and the appointment.
• Filing three years and stopping. The streamlined procedures and the Form 8854 certification measure different periods.
• Omitting ISAs, pensions and company shares. Assets that are invisible on a UK return are frequently the most heavily reported on a US one.
• Telling a UK bank you are not a US person without evidence. A self-certification is a formal statement; it should match the documented position.
• Never filing Form 8854. Holding the certificate without filing the form leaves the IRS un-notified and the tax status unresolved.
• Using the US passport in the meantime. We give no advice on its nationality-law effect, but conduct after the act is something counsel will want to know about before any statement is made.

Who does what?

A sound engagement has a clear division of labour. Nationality-law counsel advises on the status question and represents you at the State Department. We prepare the returns: the US back years, the streamlined submission, the FBARs, the final dual-status return and Form 8854, coordinated with your UK self assessment so that foreign tax credits are claimed in the right year and treaty positions are consistent on both sides. As US-UK tax accountants working with high-net-worth individuals, founders and executives, we are used to working alongside counsel on a shared timetable. Further reading on each stage is in our guides library.

Key points to take away

• Becoming British did not, for US tax purposes, end US citizenship. A documented event involving the State Department does.
• Until the State Department and the IRS have both been notified, the IRS treats you as a US citizen, with annual returns, FBARs and Form 8938 due.
• For a UK resident the tax due is often small once UK tax is credited; the missing filings are the real exposure.
• The five-year certification on Form 8854 can only be made honestly if five years are actually compliant, and the streamlined procedures cover three.
• The catch-up comes first, the consulate second, Form 8854 last.

If you became British years ago, have no Certificate of Loss of Nationality, and have been asked a question about your US status that you could not answer with a document, the position is recoverable and it is far better addressed deliberately than under pressure from a bank. To have the back years scoped and prepared in the right order, contact our cross-border team for a confidential consultation.