PFIC Screening for US Clients Abroad: Irish UCITS, Canadian ETFs and Form 8621

Published 30 October 2026 by Steffan Kharmaaiarvi, founder

A US citizen living in London, Toronto or Sydney is taxed by the United States on their worldwide income wherever they live. Local advice often reaches for the local default: an Irish UCITS world tracker, a Canadian-listed ETF, a UK OEIC. For a US person each of those is usually a passive foreign investment company (PFIC). The US rules for PFICs are punitive by design, and each fund generally means another form every year. This note explains the test, works through an example and sets out what to settle with the client's US tax adviser. It is decision support, not tax advice.

What makes a fund a PFIC

Under IRC §1297, a foreign corporation is a PFIC for a year if either test is met:

• Income test: 75% or more of its gross income is passive income (dividends, interest, gains).
• Asset test: at least 50% of its assets produce passive income or are held to produce it.

A fund that holds shares and bonds meets both tests almost by definition. Most funds organised outside the US (Irish and Luxembourg UCITS, UK OEICs, Canadian mutual funds and ETFs, Australian unit trusts) are usually treated as corporations for US tax purposes, so they are generally PFICs. A US-domiciled fund is not a foreign corporation and cannot be a PFIC. Shares in a foreign operating company are a different matter and are rarely PFICs.

Why it matters

• The default regime. Under IRC §1291, a gain on sale and any "excess distribution" (broadly, distributions above 125% of the average of the three previous years) are spread over the holding period. The amounts allocated to earlier years are taxed at the highest ordinary rate for each of those years, plus an interest charge. The long-term capital gains rate never applies.
• QEF election. The client is taxed each year on their share of the fund's earnings. It is only possible if the fund provides an annual information statement, which many non-US funds do not.
• Mark-to-market election. For marketable funds, each year's increase in value is taxed as ordinary income.
• Form 8621. Under the IRS instructions, a PFIC shareholder generally files one Form 8621 for each PFIC every year, subject to the exceptions set out there.

A worked example

A US citizen resident in the UK, in the top US bracket (37%), holds three funds with round illustrative values:

The screen reads: two likely PFICs, two likely Forms 8621 a year, 67% of a USD 600,000 portfolio. Now suppose the Irish fund is sold after five years with a USD 50,000 gain, accrued evenly, with no election made. Under §1291, USD 10,000 is allocated to each year. The four earlier years are taxed at 37%, USD 14,800, plus interest; the current year's USD 10,000 is ordinary income, USD 3,700 at 37%. That is USD 18,500 before the interest charge. The same gain on a US-domiciled ETF held for more than a year would be taxed at the 20% long-term rate: USD 10,000. UK tax and foreign tax credits are left aside here, and they matter.

The fix is not simply "buy US funds". For a UK resident a US-domiciled ETF is an offshore fund, and its UK treatment depends on its reporting status: see UK reporting fund status. For a dual-taxed client the right answer is rarely the default in either country, which is why the usual Irish-ETF argument does not carry over to a US person.

Common mistakes

• Assuming the local wrapper solves it. The US generally does not recognise an ISA or a TFSA, so a PFIC inside one is still a PFIC. Pension wrappers can be different under a treaty and need specialist review.
• Counting funds, not filings. Ten small UCITS positions can mean ten forms a year.
• Missing the client's status. Green-card holders and "accidental Americans" born in the US are US persons too.
• Applying non-resident logic. W-8BEN, the USD 60,000 non-resident estate-tax threshold and the Irish-domicile saving all assume the client is not a US person.

How Borderfolio for Advisors handles it

When a client is marked as a US person:

• Likely PFICs. Each fund domiciled outside the US, read from the ISIN and the instrument type, is listed as a likely PFIC.
• Filings and weight. The finding counts the likely Form 8621 filings and shows the share of the portfolio those funds represent.
• Unclassified holdings. Holdings that cannot be classified are listed separately rather than guessed.
• Non-resident screens omitted. W-8BEN, the non-resident estate-tax threshold and UCITS counterparts are not shown, because for a US person an Irish fund creates PFIC exposure rather than a saving.

Where the screen stops

• No PFIC tax is computed. QEF and mark-to-market elections, the excess-distribution charge and the Form 8621 filing exceptions depend on the client's history and are for their US tax adviser.
• It is a screen, not a determination: a fund's actual status depends on its income and assets in each year.
• State taxes and the treatment of foreign pensions are not assessed.

Sources: 26 U.S.C. §1297, 26 U.S.C. §1291, IRS, Instructions for Form 8621.

Frequently asked questions

Are Irish UCITS ETFs PFICs for US citizens?

Usually. An Irish UCITS fund is generally treated as a foreign corporation for US tax purposes and earns almost entirely passive income, so it meets the PFIC tests in IRC §1297. Each one is generally reported on Form 8621 every year.

Is a Form 8621 needed for each fund?

Generally yes: one form per PFIC per year, subject to the exceptions in the IRS instructions. Whether an exception applies is for the client's US tax adviser.

Are US-domiciled ETFs PFICs?

No. A fund organised in the US is not a foreign corporation, so it cannot be a PFIC. It can raise other questions in the client's residence, such as UK reporting fund status.

Does Borderfolio calculate PFIC tax?

No. It lists likely PFICs, counts the likely Form 8621 filings and shows their share of the portfolio. Elections, the excess-distribution charge and filing exceptions are left to the client's US tax adviser.