Form 8621 & PFIC Reporting for Americans in the UK
How to file Form 8621 from the UK. Learn which UK investments are PFICs, including ISAs, OEICs, and unit trusts, and how to make QEF or mark-to-market elections.
Form
Form 8621
Country
United Kingdom
Filing Status
Treaty in force
Overview
The United Kingdom is one of the most popular destinations for American expats, but it is also a PFIC minefield. UK Individual Savings Accounts (ISAs), Open-Ended Investment Companies (OEICs), and unit trusts are almost always PFICs. If you hold these investments, you must file Form 8621 and choose a tax regime — or face punitive excess distribution taxation. This guide explains how UK-specific investment structures map to US PFIC rules.
Country-Specific Guidance
UK ISAs (Cash ISAs, Stocks & Shares ISAs, Lifetime ISAs) are not recognized by the US and do not receive tax-free treatment. Stocks & Shares ISAs that hold UK funds are PFICs.
UK OEICs and unit trusts are pooled investment vehicles organized in the UK. Because they are foreign corporations that meet the passive income or asset test, they are PFICs.
UK investment platforms (Hargreaves Lansdown, AJ Bell, Interactive Investor) do not provide US tax forms or Annual Information Statements. Without an AIS, you cannot make a QEF election.
The UK-US tax treaty does not override PFIC rules. Treaty benefits do not eliminate Form 8621 filing or the PFIC tax regimes.
UK pension funds (SIPPs, workplace pensions) may hold PFICs internally. The pension wrapper may protect you from immediate PFIC taxation, but the analysis is complex and depends on whether the pension is treated as a trust or an employment pension under US rules.
Common Mistakes
Assuming UK ISAs are tax-free for US purposes — they are not. Income and gains inside a Stocks & Shares ISA are taxable in the US.
Failing to file Form 8621 for UK unit trusts because they are called "funds" rather than "corporations."
Attempting a QEF election without the Annual Information Statement, which UK funds almost never provide.
Overlooking PFICs inside UK pension wrappers, which may trigger indirect ownership rules.
Filing Tips
If you hold UK OEICs or unit trusts that are publicly traded, consider the mark-to-market election to avoid the excess distribution method.
Keep detailed records of all purchases, sales, dividends, and distributions for every UK fund you hold.
If you have a UK SIPP, consult a specialist to determine whether the pension wrapper protects you from PFIC attribution.
File Form 8621 with your Form 1040 by the extended due date for taxpayers abroad.
Frequently Asked Questions
Is my UK ISA a PFIC?
The ISA wrapper itself is not a PFIC, but the investments inside a Stocks & Shares ISA may be. If your ISA holds UK OEICs, unit trusts, or foreign ETFs, those underlying investments are PFICs. Cash ISAs are not PFICs but must still be reported on FBAR and possibly Form 8938.
Can I make a QEF election for a UK unit trust?
Only if the fund provides an Annual Information Statement (AIS). Most UK OEICs and unit trusts do not provide AISs because they are not structured for US tax compliance. Without an AIS, your only elections are mark-to-market (if publicly traded) or the default excess distribution method.
Does the UK-US tax treaty eliminate PFIC rules?
No. The UK-US tax treaty does not override the PFIC provisions of the Internal Revenue Code. Treaty benefits may reduce withholding tax on dividends and interest, but they do not change the PFIC classification or filing requirements.
Need Help Filing Form 8621 from United Kingdom?
FileAbroad specializes in U.S. expat tax filing. We help Americans in United Kingdom navigate Form 8621, the FEIE, FBAR, and FATCA requirements.