HMRC Reporting Fund Rules for a US Citizen: The Two-Sided PFIC Trap

HMRC reporting fund status decides how the UK taxes a fund, and it does nothing for a US citizen on the American side. A fund on HMRC's approved list gives a UK resident capital gains treatment on sale, but the IRS still treats almost every non-US fund as a PFIC. Each country runs its own test, so a fund has to pass both. This guide sets the two regimes side by side, shows where they collide, and identifies the holdings that satisfy both.

A PFIC is a passive foreign investment company: the US label for a non-US company that mostly earns or holds passive investments. If you are a US citizen or green card holder living in the UK, both labels apply to you at once, because the UK taxes you as a resident and the US taxes you on citizenship.

What is an HMRC reporting fund, and why does it matter to a US citizen in the UK?

An HMRC reporting fund is an offshore fund that has applied to HMRC, been approved, and keeps that status by reporting its income every year. It matters to a US citizen in the UK because reporting status is the difference between a capital gain and an income tax charge when the fund is sold, and the funds the US treats kindly are all offshore funds in HMRC's eyes.

HMRC's helpsheet HS265 describes an offshore fund as, broadly, an investment fund based outside the UK that meets certain conditions. A fund domiciled in Ireland, Luxembourg or the United States is offshore for this purpose. A UK-domiciled unit trust or OEIC (open-ended investment company) is not, so the offshore fund rules do not apply to it at all.

The HMRC Investment Funds Manual at IFM13100 sets out the two outcomes for UK investors:

• Reporting fund. You are taxed each year on the fund's reported income, including income it did not pay out. When you sell, the gain is a capital gain, provided the fund was a reporting fund for the entire period you held it.
• Non-reporting fund. You are taxed on the distributions you actually receive. When you sell, the gain is taxed as if it were income. HMRC calls this an offshore income gain.

What the difference costs in 2026/27

For the 2026/27 tax year, Capital Gains Tax on shares and funds is charged at 18% within the basic rate band and 24% above it, after a £3,000 annual exempt amount. Income Tax for 2026/27 is charged at 20%, 40% and 45%. An offshore income gain falls under the second set of rates and gets no annual exempt amount.

Illustrative example: a UK resident higher rate taxpayer sells a US-domiciled ETF in 2026/27 and makes a gain of £40,000, all of which falls in the higher rate band. If the ETF was an HMRC reporting fund throughout, the taxable gain after the £3,000 exempt amount is £37,000 and Capital Gains Tax at 24% is £8,880. If the ETF never had reporting status, the whole £40,000 is an offshore income gain and Income Tax at 40% is £16,000. The same sale costs £7,120 more.

Losses are treated asymmetrically. Under IFM13550, a loss on a non-reporting fund makes the offshore income gain nil and can be relieved only as a capital loss. It cannot be set against offshore income gains on other funds.

Excess reportable income: tax on money you did not receive

Reporting status has its own cost. If a reporting fund earns more income than it distributes, the difference is excess reportable income. HS265 says this income is treated as received on the fund distribution date, which is six months after the last day of the fund's reporting period. You pay UK tax on it in that tax year even though no cash arrives.

For a fund that is a company, the amount is normally taxed as a foreign dividend, at the 2026/27 dividend rates of 10.75%, 35.75% and 39.35%. Where more than 60% of the fund's investments are interest-bearing, HS265 says to report the income as interest instead. Brokers outside the UK rarely show excess reportable income on their statements, so it usually has to be found in the report the fund publishes for UK investors.

The relief comes on sale. IFM13373 confirms that accumulated income already taxed is added to your acquisition cost, so the same income is not taxed again as part of the capital gain. That only works if you kept a record of each year's figure.

How do the US PFIC rules treat the same fund?

The US PFIC rules ignore UK reporting fund status completely. Under the Instructions for Form 8621, a foreign corporation is a PFIC if 75% or more of its gross income is passive, or at least 50% of its assets produce passive income. A pooled investment fund set up outside the US meets those tests by design, whether it is a UK OEIC, an investment trust or an Irish ETF.

A US citizen who holds a PFIC falls into one of three regimes, each reported on Form 8621:

1. Section 1291 (the default). The instructions state that the entire gain on disposal is treated as an excess distribution. It is allocated to each day of the holding period, and the amounts allocated to earlier PFIC years carry a separate tax and an interest charge. A distribution is also an excess distribution to the extent it exceeds 125% of the average of the previous three years.
2. Qualified electing fund (QEF). The shareholder includes a share of the fund's ordinary earnings as ordinary income and of its net capital gain as long-term capital gain every year. The election needs a PFIC Annual Information Statement from the fund.
3. Mark-to-market. Available only for marketable stock that is regularly traded on a qualifying exchange. The shareholder includes each year's rise in value as ordinary income; losses are deductible only up to gains previously included.

QEF and mark-to-market elections must be made by the due date, including extensions, of the US return for the year concerned. The instructions also contain limited exceptions from completing Part I of the form, including one where the total value of all PFIC stock is $25,000 or less ($50,000 on a joint return) and there was no excess distribution or disposal gain in the year. That exception removes a form, not the tax on a later sale.

Our guide to why UK funds in an ISA are PFICs on a US return works through the section 1291 calculation in more detail.

The four combinations: UK status against US status

Put the two tests together and every fund lands in one of four boxes. This table is the quickest way to see where a holding sits. The UK column assumes a UK resident investor holding outside a pension or ISA; the US column assumes a US citizen or green card holder.

Type of fund	UK treatment (HMRC)	US treatment (IRS)	Result
UK-domiciled unit trust, OEIC or investment trust	Not an offshore fund; gain is a capital gain	PFIC; Form 8621	Fails the US test
Irish or Luxembourg fund or ETF with HMRC reporting status	Capital gain on sale; excess reportable income taxed yearly	PFIC; Form 8621	Fails the US test
Non-US fund without HMRC reporting status	Offshore income gain taxed as income	PFIC; Form 8621	Fails both tests
US-domiciled ETF or mutual fund without HMRC reporting status	Offshore income gain taxed as income	Ordinary US fund; not a PFIC	Fails the UK test
US-domiciled ETF or mutual fund with HMRC reporting status	Capital gain on sale; excess reportable income taxed yearly	Ordinary US fund; not a PFIC	Passes both

Only the last row works on both returns. Individual shares and directly held bonds sit outside both regimes altogether, because neither a single trading company nor a gilt is a fund. Our holding-by-holding guide to investing as an American in the UK covers those alternatives.

Why HMRC reporting fund status does not solve the PFIC problem

The two regimes look alike, and that is why they are confused. A reporting fund taxes UK investors each year on undistributed income. A QEF election taxes US shareholders each year on undistributed earnings. Both are annual, both need a document from the fund, and both adjust the cost of the holding so income is not taxed twice.

They are still different documents built on different rules. The report a fund publishes for UK reporting fund purposes gives reportable income per unit under the UK regulations. A PFIC Annual Information Statement gives the shareholder's pro rata share of ordinary earnings and net capital gain as the US rules define them. A fund that produces the first has made no promise to produce the second, and many European retail funds do not.

The reverse is equally true. A US-domiciled fund is outside the PFIC rules because it is a US entity, and that fact carries no weight with HMRC. Unless the manager applied for UK reporting status, a UK resident's gain on that fund is an offshore income gain.

Where the two systems collide: timing and foreign tax credits

Even when the tax in each country is manageable, the two systems often tax the same growth in different years and as different kinds of income. That matters because double taxation is relieved by a foreign tax credit, and a credit only helps when there is tax in both countries to match.

• Mark-to-market against UK capital gains. With a mark-to-market election on a UK reporting fund, the US taxes each year's unrealised rise as ordinary income. The UK taxes nothing until sale, then charges Capital Gains Tax on the whole gain in one year. US tax is paid for years before any UK tax exists to credit.
• Excess reportable income against US distributions. The UK taxes excess reportable income six months after the fund's period end. The US taxes a US fund's actual distributions when paid. The amounts and tax years rarely line up exactly.
• Offshore income gain against US capital gain. A US ETF without reporting status produces income for HMRC and a long-term capital gain for the IRS on the same sale, so the UK tax is usually the larger figure.

The IRS explains in Topic no. 856 that the foreign tax credit is limited to the US tax attributable to foreign source income, and that unused foreign tax can be carried back one year and forward ten. That carryover window is what decides whether a timing mismatch is a cash flow problem or a permanent cost. Our article on foreign tax credit relief in the UK explains the claim from the HMRC side.

How to check a fund before you buy it

1. Find the domicile. The first two letters of the ISIN show where the fund is registered: GB for the UK, IE for Ireland, LU for Luxembourg, US for the United States. A fund listed in London is often domiciled in Dublin.
2. Apply the US test. If the fund is not a US entity, treat it as a PFIC unless you have specific advice otherwise.
3. Apply the UK test. If the fund is not UK-domiciled, search HMRC's list of approved offshore reporting funds, which is updated every month, for the exact share class by ISIN or CUSIP.
4. Check the dates. Confirm from the list and the fund's own investor reports when its reporting status began and that it is still in force. Capital gains treatment needs reporting status for your whole holding period.
5. Check access. A US ETF with reporting status may still be unavailable on a UK retail platform. Our article on US ETFs for UK residents and the PRIIPs rules covers the routes that exist.
6. Keep the annual figures. Record each year's excess reportable income in sterling and each distribution in dollars, so both base costs can be proved on sale.

What people get wrong about reporting funds and PFICs

• Assuming "reporting" means reported to the IRS. The name refers to reporting to HMRC and UK investors. It has no US meaning.
• Checking the fund family, not the share class. Reporting status is granted to specific sub-funds and share classes. One class of a fund can be on the list while another is not.
• Forgetting funds bought before the move. An American who arrives in the UK with US mutual funds brings offshore funds with them. The gain on a non-reporting fund is an offshore income gain when sold as a UK resident.
• Leaving excess reportable income off the UK return. It does not appear as cash, so it is easily missed, and it belongs on the Self Assessment return with the foreign pages.
• Treating a wrapper as a fix. An ISA removes the UK tax and leaves the US position untouched. A registered pension is different on both sides, as our guide to SIPP reporting on a US return explains.

Already holding the wrong fund?

Selling is not always the right first step. A sale of a section 1291 fund triggers the excess distribution calculation, and a sale of a non-reporting fund triggers the offshore income gain, sometimes on the same disposal. The order of sales, the tax year they fall in, the elections still available and the foreign tax credits on hand all change the total.

US/UK Cross Border Tax is a firm of US CPAs and UK tax advisers working as one team, with offices in London, Manchester, New York and San Francisco. We carry out an HMRC reporting fund and PFIC review for US citizens holding by holding, prepare Form 8621 and the UK foreign pages from the same data, and model an exit before anything is sold. If you are one of the Americans living in the UK with funds on either side of the Atlantic, contact us with a list of your holdings and their ISINs.