Offshore Disclosure for Hong Kong Accounts After a London Move

Offshore disclosure for an American who moved from Hong Kong to London means two separate repairs: the US side (missed FBARs, Form 8938 and PFIC reporting on Hong Kong accounts) and the UK side (foreign income and gains omitted since arrival). Most executives can fix both through the IRS Streamlined Foreign Offshore Procedure and an HMRC worldwide disclosure, filed in a coordinated order.

The pattern is familiar to us at Jungle Tax. A US citizen banker, trader or regional executive spends several years in Hong Kong, is transferred to London, and leaves the Hong Kong current account, the brokerage account and a portfolio of locally domiciled funds exactly where they were. Nothing in Hong Kong prompted a tax conversation, because Hong Kong does not tax dividends, capital gains or most bank interest. Then a UK adviser asks about foreign accounts, a Hong Kong institution sends a self-certification form asking for a new tax residence, or the executive simply reads about the Common Reporting Standard and realises that two tax authorities may already hold data he has never reported. This guide is written for that reader. It deals with return preparation and compliance catch-up only; it deliberately excludes the Mandatory Provident Fund and any pension or retirement scheme, which carry their own separate analysis.

Why Hong Kong accounts become a two-country problem after a move to London

While you lived in Hong Kong, only one tax authority had a real claim on your investment income: the IRS, because the United States taxes its citizens on worldwide income wherever they live. Hong Kong's territorial system left dividends, gains and most deposit interest untaxed locally, so the practical exposure was purely American. The day you became UK resident, a second claimant appeared. The UK taxes residents on worldwide income and gains, subject to the historic remittance basis and, from 6 April 2025, the new foreign income and gains (FIG) regime.

Three features make Hong Kong specifically awkward, and the generalist guides that rank for this subject rarely connect them:

• There is no US-Hong Kong income tax treaty. No treaty rate reductions, no tie-breaker, no treaty-based relief for Hong Kong investment products. Before the move, US tax on Hong Kong dividends and gains was usually tax with nothing to credit against it.
• Hong Kong funds are hostile on both sides. A Hong Kong-domiciled unit trust or mutual fund is typically a passive foreign investment company (PFIC) for US purposes and, unless it holds UK reporting fund status, a non-reporting offshore fund for UK purposes. Each regime can convert what feels like a capital gain into heavily taxed income.
• Information is already moving. Hong Kong participates in automatic exchange under the Common Reporting Standard, and Hong Kong financial institutions report US account holders to the IRS under FATCA. Once your Hong Kong institution records a UK address or UK tax residence, your balances and income can reach HMRC every year.

What did you miss on the US side?

US compliance failures on Hong Kong accounts almost always fall into four categories. Knowing which ones apply determines which IRS route is available.

FBAR (FinCEN Form 114)

If the aggregate maximum value of your non-US financial accounts exceeded $10,000 at any time during a calendar year, an FBAR was required for that year. The test aggregates every account: the Hong Kong current account, the savings account, the brokerage account, any multi-currency wealth account and, after the move, your UK accounts too. Signature authority over employer accounts can also create a filing requirement, which is a common oversight for bankers who had authority over desk or entity accounts in Hong Kong. The FBAR is filed electronically with FinCEN, separately from the tax return.

Form 8938 (FATCA statement of specified foreign financial assets)

Form 8938 is attached to the Form 1040 and overlaps with, but does not replace, the FBAR. For a taxpayer who lives abroad, the thresholds are materially higher than for US residents: broadly, a single filer reports when specified foreign assets exceed $200,000 at year end or $300,000 at any time in the year, and married couples filing jointly at $400,000 and $600,000. Senior executives with Hong Kong brokerage portfolios often cross these levels. See the IRS guidance on Form 8938 for the full definitions.

Form 8621 and the PFIC regime

Hong Kong-domiciled mutual funds, unit trusts and many locally listed exchange-traded funds are PFICs. Unless you made a valid election in the first year of holding, the default excess distribution regime applies: gains on sale and larger distributions are spread across the holding period, taxed at the highest ordinary rate for each prior year, and charged an interest amount on top. A qualified electing fund (QEF) election requires an annual information statement that Hong Kong funds rarely produce, and a mark-to-market election is available only for marketable stock. An annual Form 8621 is generally required for each PFIC, and missing forms can keep the statute of limitations open on the whole return.

Unreported or misreported income

Even diligent filers often report Hong Kong dividends but omit deposit interest, currency conversion events, fund distributions reinvested automatically, or gains on securities sold inside the brokerage account. Because Hong Kong levies no tax on these items, there is no foreign tax credit to absorb the US liability. The tax shortfall is usually real money, even if the balances are held in a jurisdiction with no tax of its own.

What did you miss on the UK side?

The UK exposure starts in the tax year of arrival and depends on three questions: when UK residence began, whether the remittance basis was validly claimed for years up to 2024-25, and whether FIG relief has been or can be claimed for 2025-26 onwards.

The arrival year and split-year treatment

Under the Statutory Residence Test, an executive who moves to London mid-year is usually UK resident for the whole of that tax year, but split-year treatment can divide it into an overseas part and a UK part. For an employee transferred to London the relevant case is often starting full-time work in the UK, or starting to have a home only in the UK. Income and gains of the Hong Kong accounts that arise in the overseas part are generally outside UK tax; those arising after the arrival date are within it. The date matters: a Hong Kong fund sold three weeks after arrival is a UK event, not a Hong Kong one. HMRC's Residence, Domicile and Remittance Basis Manual sets out the split-year cases in detail.

Pre-April 2025 years: the remittance basis that may not have been claimed

Until 5 April 2025, a non-UK-domiciled individual could claim the remittance basis, leaving Hong Kong income and gains outside UK tax unless brought to the UK. Most American executives in London were non-domiciled, and in the first seven of nine tax years the claim carried no annual charge. The trap is procedural. The remittance basis generally had to be claimed on a Self Assessment return, with a narrow automatic exception where unremitted foreign income and gains were under £2,000. An executive who never filed a return, or filed one without the claim, was taxable on the arising basis: every pound of Hong Kong interest, dividends and gains in those years is potentially in charge. Whether a late claim can still be made depends on the claims time limit for each year, so the oldest arrival years can be locked on the arising basis. There is also a mixed-fund question: transfers from the Hong Kong account to a London account may have been taxable remittances even where a claim was made.

From 6 April 2025: the FIG regime

The remittance basis was abolished for 2025-26 onwards and replaced by a four-year FIG regime for individuals who arrive after ten consecutive tax years of non-residence. Relief applies only to the first four tax years of UK residence, and a split arrival year counts as one of them. An executive who arrived in 2022-23 therefore has at most 2025-26 inside the window; one who arrived in 2023-24 has 2025-26 and 2026-27. Relief must be claimed on the return and costs the personal allowance and the capital gains annual exempt amount for that year. Anyone past year four is simply taxed on worldwide income and gains, including the Hong Kong accounts, on the arising basis. The Temporary Repatriation Facility, which lets former remittance basis users designate and remit pre-April 2025 foreign income and gains at a reduced rate for three tax years, may be relevant where Hong Kong money has already come, or needs to come, to London.

Offshore funds and currency

For UK purposes, a Hong Kong fund without reporting fund status is a non-reporting offshore fund: the gain on disposal is an offshore income gain taxed at income tax rates, not capital gains tax rates. By contrast, UK capital gains tax does not apply to currency gains on an individual's foreign currency bank accounts, so a Hong Kong dollar deposit is not a UK capital gains problem simply because sterling moved. Securities held in the brokerage account are a different matter: each disposal is computed in sterling using exchange rates at acquisition and disposal, which can produce a UK gain even where the Hong Kong dollar value barely changed.

US vs UK: how each system treats the same Hong Kong account

Issue	United States (IRS)	United Kingdom (HMRC)
Basis of charge	Citizenship: worldwide income every year, whether in Hong Kong or London	Residence: worldwide income from UK arrival, subject to split-year, remittance basis (to 2024-25) or FIG relief (2025-26 on)
Account reporting	FBAR over $10,000 aggregate; Form 8938 above the higher overseas thresholds	No separate account-disclosure form; income and gains reported on the Self Assessment foreign pages
Hong Kong funds	Usually PFICs: Form 8621, excess distribution tax and interest charge by default	Non-reporting offshore funds: gains taxed as income
Hong Kong bank interest and dividends	Taxable; no Hong Kong tax to credit and no treaty	Taxable from arrival unless protected by a valid remittance basis claim or FIG relief
Currency movements	Measured in US dollars; the Hong Kong dollar peg keeps most deposit currency gains small	Measured in sterling; foreign currency bank accounts exempt from CGT, securities are not
Catch-up route	Streamlined Foreign Offshore Procedure, or delinquent FBAR / information return procedures	Worldwide Disclosure Facility, or amended returns where the error is within the amendment window
Look-back	Three years of returns and six years of FBARs	Four, six, twelve or twenty years depending on behaviour and whether the matter is offshore
Penalty outcome	No penalty under the foreign offshore procedure if non-wilfulness is accepted	Behaviour-based offshore penalties, reduced for unprompted disclosure

How the US-UK treaty changes the arithmetic after the move

This is the angle that almost every page on the subject misses. Before the move, US tax on Hong Kong income was usually final, because nothing was paid in Hong Kong and no treaty exists. After the move, the US-UK income tax treaty applies between the two countries that now tax you. Hong Kong interest and dividends are foreign-source to both, and the UK, as country of residence, taxes them first. The United States then generally allows a foreign tax credit for the UK tax paid. Because UK rates on interest and dividends for a higher or additional rate taxpayer usually exceed the US rate on the same income, the residual US tax on those items after the move is often small once the UK tax is properly computed.

Two consequences follow for a disclosure:

• The US computation cannot be finalised until the UK computation is done. Any year in which the UK taxes the Hong Kong income on the arising basis will generate foreign tax credits that reduce the US amount due under the streamlined filing. Filing the US side first with no credits overstates US tax and then requires a second amendment.
• Remittance basis and FIG years produce the opposite result. If Hong Kong income was sheltered in the UK, there is no UK tax to credit, so the full US liability stands. The protection in London does nothing for the American exposure, and executives are routinely surprised that a UK relief leaves their US bill untouched.

The PFIC interaction deserves separate attention. An excess distribution under US rules and an offshore income gain under UK rules arise on the same disposal but are measured differently, in different currencies and over different periods. Matching the UK tax to the right US year and income category, so the credit is usable, is the difference between a clean computation and paying tax twice.

Which IRS route fits: Streamlined Foreign Offshore or something narrower?

The Streamlined Filing Compliance Procedures are the standard route when tax was underreported and the failure was non-wilful. Under the foreign offshore version, you file delinquent or amended returns for the three most recent years whose due date has passed, delinquent FBARs for the six most recent years, and a Form 14653 certification of non-wilful conduct, and you pay the tax and interest shown. To qualify, a US citizen must have lived outside the United States for at least 330 full days in at least one of the three years and have no US abode that year. A Hong Kong-to-London executive meets this comfortably. Where it is accepted, no miscellaneous offshore penalty applies.

The narrower routes matter too. If every return was filed and all income was reported, but the FBARs were not, the delinquent FBAR submission procedures may be enough. If income was fully reported but information returns such as Form 8938 or Form 8621 were missing, the delinquent international information return procedures may apply. Our IRS streamlined filing team selects the route after reviewing the actual statements, not before.

The non-wilful certification for financial professionals

The certification is a narrative, and the IRS reads it with the taxpayer's background in mind. A banker who spent a career around cross-border products will be asked, implicitly, why he did not know. A credible statement explains the actual facts: reliance on an employer's tax provider that dealt only with salary, a belief that a jurisdiction with no investment tax produced nothing to report, accounts opened for local living rather than investment. It should never overstate ignorance, and where the facts suggest wilful blindness the streamlined route is the wrong choice and a different disclosure strategy is required.

Which HMRC route fits: the Worldwide Disclosure Facility or an amendment?

Where the unpaid UK tax relates to offshore income or gains, HMRC expects the Worldwide Disclosure Facility. You notify HMRC through the Digital Disclosure Service, receive a disclosure reference number, and then have 90 days to submit the full disclosure with payment. The number of years depends on behaviour: generally four years where reasonable care was taken, and longer where it was not. For offshore matters the assessment window for careless errors can extend to twelve years, and deliberate conduct reaches twenty. For a recent arrival from Hong Kong, the practical span is usually every UK year since arrival, which is the cleanest position anyway.

Where a return was filed on time and the error is simply a missing entry within the twelve months after the filing deadline, an amendment can be enough. Where returns were never filed at all, the position is usually a failure to notify chargeability, and the WDF is the better vehicle because it lets you present all years, the behaviour and the penalty mitigation together. General HMRC guidance on tax on foreign income explains the baseline reporting duty for UK residents.

Penalties and why the disclosure should be unprompted

UK offshore penalties turn on behaviour, on whether the disclosure is prompted or unprompted, and on the category of the territory involved. An unprompted disclosure attracts the largest reductions. Once HMRC opens an enquiry or sends a nudge letter based on CRS data, a subsequent disclosure is more likely to be treated as prompted. That is the strongest practical reason not to wait.

Sequencing the two disclosures: a worked plan

Consider a US citizen managing director who lived in Hong Kong from 2017, transferred to London in September 2022, and held a Hong Kong current account, a brokerage account with local shares and three Hong Kong unit trusts. He filed US returns reporting his salary but no FBARs, no Form 8938 and no Form 8621, and he has filed UK returns for employment income only, without any remittance basis claim.

1. Collect the complete record. Year-end and maximum-balance statements for every account from 2019 onwards, full transaction histories for the funds from acquisition, and all UK and US returns already filed. Hong Kong institutions can take weeks to produce archived statements, so this starts first.
2. Fix the UK timeline. Establish residence for 2022-23 and whether split-year treatment applies from the September arrival date. Test whether late remittance basis claims are still possible for any year. Confirm whether FIG relief is still available for 2025-26, which is his fourth and final eligible year, and check the ten-year non-residence condition before relying on it.
3. Compute the UK position. Interest, dividends, sterling gains on shares and offshore income gains on the unit trusts for every arising-basis year, together with any taxable remittances.
4. Compute the US position using the UK figures. Excess distribution calculations for each fund, the three amended returns with foreign tax credits for the UK tax on the London-era Hong Kong income, six FBARs and the missing Forms 8938 and 8621.
5. Reconcile the two packs. Balances, dates and income figures must be consistent, explaining any difference that arises from currency, tax year ends (calendar year in the US, 6 April in the UK) or the PFIC regime.
6. File in a controlled window. Typically the HMRC notification is made first to fix the disclosure as unprompted, the US streamlined submission follows once the UK figures are settled, and the WDF submission lands within the 90 days. Because both authorities receive CRS or FATCA data, they should see the same story.
7. Put future years on a clean footing. Update the Hong Kong self-certifications to UK residence, decide whether the Hong Kong accounts still serve a purpose, and build FBAR, Form 8938, Form 8621 and UK foreign pages into the annual cycle.

Does CRS mean HMRC already knows about my Hong Kong accounts?

Possibly, but not necessarily. A Hong Kong financial institution reports an account to HMRC under the Common Reporting Standard when it treats the holder as UK tax resident, usually because of a self-certification or UK indicia such as a UK address or phone number. Many relocated executives never updated their Hong Kong details, so the accounts may still be treated as Hong Kong or US reportable. That buys no protection: institutions periodically refresh self-certifications, a UK address anywhere in the file triggers review, and HMRC also receives data under other exchange arrangements. The prudent assumption is that the data will arrive, and that your disclosure should be on record first. On the US side, Hong Kong has a FATCA agreement under which local institutions report US account holders, which is why an IRS letter about a Hong Kong account can arrive years after the account was opened.

Common mistakes we see in Hong Kong to London cases

• Treating the absence of Hong Kong tax as the absence of reporting. It is the opposite: nothing to credit means the US tax is uncovered.
• Filing the US streamlined submission before the UK computation, then having to amend again for credits.
• Assuming the remittance basis applied automatically in years when no UK return, or no claim, was filed.
• Claiming FIG relief for 2025-26 without checking the ten-year non-residence test and the four-year count from arrival.
• Ignoring the PFIC and offshore fund rules because the funds are well-known retail products in Hong Kong.
• Leaving employer-account signature authority off the FBAR.
• Drafting a non-wilful statement that reads as boilerplate for someone whose profession is finance.

How Jungle Tax prepares a Hong Kong to London disclosure

We prepare both sides as one engagement: the streamlined returns, FBARs and information forms for the IRS, and the Worldwide Disclosure Facility submission and corrected Self Assessment position for HMRC, reconciled line by line. Our work is return preparation and compliance, not investment or structuring advice. For related reading, see our US-UK tax accountants overview, use the FBAR penalty calculator to understand what is at stake if nothing is done, or browse further cross-border guides.

If you moved from Hong Kong to London with accounts still open there and have not reported them fully to both authorities, the most valuable step is the next one taken in the right order. Contact our cross-border team for a confidential consultation: we will review your statements, confirm which IRS and HMRC routes fit your facts, and set out a sequenced plan before anything is filed.