PFICs Explained for US Citizens Living in the UK - What to know about funds and ETFs

A PFIC is a non-US corporation that meets either of two tests: at least 75% of its gross income is passive income, or at least 50% of its assets, measured under the applicable rules, produce or are held to produce passive income. Passive income commonly includes interest, dividends and investment gains. 

Most non-US mutual funds and conventional equity or bond ETFs meet these tests. Their purpose is to hold investments, so their income and assets are generally passive. Ordinary operating companies are less likely to qualify, although a company’s activities, asset mix and US tax classification still need to be checked. 

The rules are intended to prevent US taxpayers from deferring tax through foreign investment companies. They also apply to many US tax residents who are not US citizens, including people whose status arises through a green card or a relevant residency election.

Unless an effective election changes the treatment, the default rules generally apply when you sell a PFIC at a gain or receive an “excess distribution”. Broadly, this is the part of a distribution above 125% of the average distributions received in the preceding three years, or the shorter relevant holding period. Special rules apply in the first year. 

Under this default treatment: 

• A disposal gain or excess distribution is allocated across the holding period. 
• Amounts allocated to prior PFIC years attract tax calculated using the highest applicable US income tax rate for each year, plus an interest charge. 
• Amounts allocated to the current year and any pre-PFIC years are generally treated as ordinary income. 
• The 3.8% net investment income tax may also apply, depending on the investor’s circumstances and the applicable rules. 

The combined tax and interest burden can exceed 50% of a gain in some cases, especially after a long holding period. This is not a standard PFIC tax rate, and the result depends on the investment history and available reliefs. 

Losses receive different treatment. A loss on one PFIC cannot simply be netted against another holding’s gain within the default PFIC calculation. However, a recognised loss may be available under ordinary capital-loss rules. It is therefore misleading to assume that all PFIC losses are unusable. 

Separate Forms 8621 may be needed for individual PFIC holdings, increasing preparation costs. Limited reporting exceptions exist, but a reporting exception does not necessarily eliminate tax. UK and US tax calculations and foreign tax credits also need to be coordinated; paying UK tax does not automatically settle the US liability. 

Common investments that may be PFICs include UK unit trusts and OEICs, Irish- and Luxembourg-domiciled ETFs, investment trusts, many money market funds and some non-US real estate investment trusts. Legal structure and US tax classification matter, so the product label alone is not conclusive. 

Ready-made portfolios often contain several such funds. Offshore investment bonds and insurance-based investments also require a separate review of the contract and any underlying fund interests; their UK tax treatment should not be assumed to carry across to the US. 

An ISA does not resolve the issue. Its UK tax advantages generally do not extend to US federal income tax, and investments inside it can still produce US taxable income, gains and PFIC reporting obligations. An ISA is not automatically unsuitable, but its holdings and reporting must be assessed from both countries’ perspectives. 

Direct shares in genuine operating companies generally avoid the pooled-fund PFIC issue. Nevertheless, an investment trust or cash-heavy company can look like an ordinary listed share while requiring a different US tax analysis. 

An ETF is a fund traded on an exchange. For a conventional fund treated as a corporation for US tax purposes, its domicile is central to the PFIC question: a US-domiciled fund is not a foreign corporation and therefore is not itself a PFIC. A non-US fund will generally be a PFIC if it meets the income or asset test. 

An Irish-domiciled S&P 500 ETF can therefore be a PFIC even though it invests in American companies. A UK-domiciled FTSE 100 tracker can also be a PFIC. Conversely, a US-domiciled fund can invest in UK or other overseas shares without itself becoming a PFIC. 

The exchange, trading currency, provider’s brand and index do not determine the answer. An Irish ETF traded in London in US dollars remains an Irish-domiciled fund. Check the prospectus and fund documentation; an ISIN prefix can be a clue, but should not be the only check. 

Currency exposure is a separate question. Investing in UK equities does not necessarily give straightforward sterling exposure: many FTSE 100 businesses earn substantial revenues overseas. A fund’s trading currency also does not, by itself, describe its underlying currency risk. 

Avoiding PFIC status is only one part of the assessment. A UK-resident investor holding a US-domiciled fund outside a tax-exempt wrapper should also check its position under the UK offshore-fund rules. 

For an offshore fund within those rules, HMRC reporting-fund status generally allows disposal gains to fall within capital gains tax rather than the offshore income-gain regime. Gains on non-reporting funds are generally taxed as income. Check the exact share class and its status over the relevant holding period, rather than relying on the provider’s name or the fund’s current status alone. 

Reporting funds may also generate excess reportable income: income taxable to the investor even though it has not been distributed in cash. This needs to be considered alongside dividends and disposal gains. 

Tax suitability and the ability to buy a fund are separate matters. Before restructuring, confirm that the proposed investments are available through a suitable account and platform for your circumstances. 

Qualifying UK pensions can receive different treatment from ISAs and ordinary investment accounts. The US–UK tax treaty can protect pension growth from current US taxation where its conditions are met. Separately, US regulations provide an annual PFIC reporting exception for certain treaty-covered foreign pension arrangements where the treaty defers taxation until income is paid to or for the participant. 

This can make non-US funds held within a qualifying workplace pension or SIPP less problematic than the same funds held personally. However, UK pension registration alone should not be presented as an automatic exemption from every US tax or reporting rule. 

Have a US–UK tax adviser confirm the treatment of the particular scheme, your eligibility for treaty benefits and any remaining reporting obligations. Contributions, investment growth and withdrawals are separate questions. The US treatment of a withdrawal, including a lump sum described as tax-free in the UK, should be checked before taking benefits.

A spouse who is neither a US citizen nor otherwise treated as a US resident for income-tax purposes may have more flexibility to hold UK funds and use UK tax-efficient accounts. Being a noncitizen is not enough: green-card status, US residence and elections to file as a US resident can change the position. 

Where appropriate, making new investments in that spouse’s name can help the household use the options available to each person. Account eligibility, contribution limits and genuine ownership still matter. 

Transferring existing PFIC holdings needs particular care: 

• PFIC consequences. A transfer can have US income-tax consequences even when no cash changes hands. Do not assume that gifting a PFIC removes accumulated exposure or can be treated like an ordinary gift of shares. Obtain advice before transferring it. 
• US gift tax. The unlimited marital deduction generally does not apply to gifts to a non-US-citizen spouse. Qualifying gifts benefit from a special annual exclusion of $194,000 in 2026. Larger gifts may require Form 709 and use available lifetime exemption; exceeding the annual exclusion does not automatically mean tax is payable immediately. 
• UK tax. Transfers between spouses or civil partners commonly qualify for no-gain/no-loss treatment for capital gains tax, subject to the relevant conditions. The recipient normally takes over the original tax cost. For inheritance tax, the spouse exemption can be restricted where a long-term UK resident gives to a spouse who is not long-term UK resident. 
• Ownership and relationship status. The assets genuinely become the recipient’s property. Unmarried partners do not receive the same spouse reliefs, and US treatment of a UK civil partnership should not be assumed to match treatment of a marriage. 

The appropriate approach depends on both spouses’ tax status, the existing gains and the household’s wider plans. Funding new investments may be simpler than transferring existing PFICs, but the funding itself can still be a gift for US tax purposes. 

Finding PFICs in an existing portfolio is a reason to review the position carefully, rather than sell immediately. 

• Gather the records. Identify each fund and share class, purchase dates and costs, distributions, sales and the account or wrapper holding it. 
• Review earlier US filings. Ask whether Forms 8621 and any related reporting were required and completed correctly. Any correction should follow the process appropriate to your circumstances. 
• Compare the available treatments. A qualified electing fund (QEF) election can change taxation but generally requires information from the fund that many retail funds do not supply. A mark-to-market election may be available for qualifying marketable stock. These elections have conditions and ongoing consequences; a late election does not necessarily remove historic exposure. 
• Model a sale or transfer in both countries. Assess tax, interest, foreign tax credits and timing before making changes. 
• Check FIG eligibility where relevant. The UK’s four-year Foreign Income and Gains regime generally requires at least 10 consecutive tax years of non-UK residence before arrival. Relief must be claimed and only covers qualifying foreign income and gains. It may help with some restructuring, but does not automatically cover every PFIC holding or remove US liabilities. 

Agree the replacement portfolio. Check US treatment, UK reporting-fund status where relevant, access, costs, risk and currency exposure before reinvesting. 

A useful review looks beyond whether an investment is a PFIC. It considers the account holding it, both countries’ tax rules and how the portfolio supports your financial plans. 

Hoxton Wealth can review your funds and ETFs, identify potential PFIC exposure and help develop an investment approach suited to your US and UK circumstances. Where specialist tax calculations, elections or historic filings are needed, the investment plan should be coordinated with your tax adviser. 

Our advisers can help you assess fund domicile and UK tax status, review investment and currency risk, and consider how pension arrangements, FIG eligibility and a spouse’s tax position affect the options available to your household. 

Contact Hoxton Wealth to arrange a cross-border investment review. 

This article provides general information, not individual tax, legal or investment advice. Tax treatment depends on personal circumstances and can change. Information reviewed on 22 October 2026. Investment values can fall as well as rise.