PFICs and Form 8621: Why Foreign Funds Are a Tax Trap for US Expats

If there is one US tax rule that catches expats off guard and costs them the most money, it is the PFIC regime. The instinct after moving abroad is to invest locally — open a brokerage account in your new country, buy a few well-known European or UK funds. For a US person, that instinct quietly creates one of the worst tax outcomes in the entire Internal Revenue Code. This guide explains what PFICs are, why they are so toxic, the elections that can help, what Form 8621 demands, and the one move that makes the whole problem disappear.

What counts as a PFIC

A Passive Foreign Investment Company (Section 1297) is any non-US corporation that meets either of two tests:

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

A pooled investment fund exists precisely to hold income-producing assets, so essentially every foreign fund fails these tests and is a PFIC. That includes:

• Foreign mutual funds and ETFs
• European UCITS funds domiciled in Ireland, Luxembourg or France
• UK OEICs, unit trusts, and investment trusts
• French SICAV / FCP / OPCVM and Spanish/German/Italian fondos / Investmentfonds
• Funds held inside wrappers — a UK ISA or SIPP, a French assurance vie, a German Riester plan

Crucially, US-domiciled funds and ETFs (Vanguard, iShares, Schwab and the like) are not PFICs, even if they invest in foreign stocks. What matters is where the fund itself is domiciled, not what it holds.

Why PFICs are so punitive: the Section 1291 default

Unless you make an election (below), every PFIC is taxed under the default Section 1291 "excess distribution"regime. When you sell a PFIC at a gain, or receive an "excess distribution" (broadly, a distribution larger than 125% of the prior three-year average), the tax is calculated brutally:

1. The gain or excess distribution is allocated rateably across every day you held the fund.
2. The portion allocated to prior years is taxed at the highest ordinary income rate in effect for each of those years — not the favorable long-term capital gains rate.
3. An interest charge is added on top, as if the tax had been due in each of those prior years.

The result: no preferential capital-gains treatment, no benefit from your actual (possibly low) bracket, and compounding interest. Effective rates well above 50% on a long-held fund are common. A modest European index fund held for a decade can be a genuinely painful line item at sale.

The two elections that can help

QEF (Qualified Electing Fund) — the best outcome, if you can get it

A QEF electionlets you treat the PFIC more like a US fund: you include your pro-rata share of the fund's ordinary earnings and net capital gain each year, and capital gain keeps its character. The catch is that you need the fund to provide a PFIC Annual Information Statementwith the required figures — and most foreign fund managers, who have no reason to cater to US investors, simply don't. When a fund does provide it (some US-marketed funds do), QEF is usually the best election available.

Mark-to-market (Section 1296)

For PFICs that are marketable stock (regularly traded on a qualifying exchange), you can elect mark-to-market: each year you report the increase in the fund's value as ordinary income (and may deduct decreases, but only to the extent of prior mark-to-market gains). It avoids the interest charge of the 1291 regime, but you pay ordinary rates annually on unrealized appreciation and you owe tax on gains you have not yet cashed out.

Both elections are most effective when made in the first yearyou own the PFIC. Making them late triggers extra mechanics (a "purging" election) to clean up the tainted prior period.

Form 8621: the compliance burden

You generally must file a separate Form 8621 for each PFIC you own, every year in which you have a reportable event — a distribution, a sale, or an active election. Even with no transactions, an election like mark-to-market requires an annual filing. Each form is detailed and time-consuming, which is why owning a handful of foreign funds can balloon your return preparation cost.

There is a limited de minimis exception: if the aggregate value of all your PFICs is $25,000 or less ($50,000 if married filing jointly) at year end, and you have no excess distributions and no election in effect, you may be relieved of the Form 8621 filing requirement for that year. The underlying Section 1291 tax rules still apply when you eventually sell. Separately, PFICs are also reportable on FATCA Form 8938 if you cross those thresholds.

The cure: hold US-domiciled funds

The cleanest way to deal with PFICs is to never own one. For the vast majority of US expats that means:

• Keep a US brokerage account (some brokers serve Americans abroad) and invest in US-domiciled ETFs and mutual funds.
• Avoid buying funds through your local foreign bank or platform, however convenient.
• Be wary of insurance and pension wrappers sold locally — they frequently hold PFICs and can add foreign-trust reporting (Forms 3520/3520-A) on top.
• If you already hold foreign funds, get advice before selling — the order and timing of cleanup matters, especially if you are also catching up via the Streamlined Procedures.

This is exactly the kind of exposure ExpatFolio is built to surface: it flags holdings that look like PFICs across your accounts so you can act before a sale triggers the 1291 regime. For the broader playbook on structuring expat investments, see our managing finances abroad guide.

Bottom line

PFIC is the rule that turns a sensible-looking local fund into a tax disaster. Assume any non-US fund is a PFIC, understand that the default 1291 regime is punitive, know that QEF and mark-to-market exist but add complexity, and remember that one Form 8621 per fund per year is a real cost. The simplest, most reliable strategy is to invest through US-domiciled funds and keep foreign funds out of your portfolio entirely.