If you are a US person holding a foreign mutual fund, an ETF listed outside the US, or shares in many foreign holding companies, the IRS likely classifies that holding as a PFIC. The default tax regime is one of the most punitive in the US tax code, and the form that has to be filed every year (Form 8621) carries its own penalty for non-filing.
Quick Answer
A PFIC is a foreign corporation that meets either the income test (75% or more of gross income is passive) or the asset test (50% or more of assets produce passive income or are held for that purpose). Foreign mutual funds, foreign ETFs, certain foreign holding companies, and many foreign-listed REITs qualify. US persons who hold PFIC shares face one of three tax regimes: default Section 1291 (punitive), QEF election, or Mark-to-Market election. Form 8621 is filed annually for each PFIC.
1. What Makes a Foreign Corporation a PFIC
Under IRC Section 1297, a foreign corporation is a PFIC if it meets either of two tests in any tax year:
- Income test: 75% or more of the corporation's gross income for the year is passive income, including dividends, interest, royalties, rents, and gains from passive investments.
- Asset test: 50% or more of the corporation's assets, by value, produce passive income or are held for the production of passive income.
The tests are applied annually. A foreign corporation may be a PFIC in some years and not others, depending on the composition of its income and assets. Once a US person holds shares in a PFIC, those shares carry PFIC consequences for their entire holding period under the once-a-PFIC-always-a-PFIC rule, unless a purging election is made.
Common entities that almost always qualify as PFICs:
- Foreign mutual funds (UCITS, SICAV, OEIC, and similar structures)
- Foreign exchange-traded funds (ETFs) listed outside the US
- Foreign closed-end investment companies
- Many foreign-listed REITs and real estate vehicles
- Foreign-organized hedge funds and private equity funds (often)
- Many foreign holding companies, especially those with concentrated investment portfolios
2. Why PFIC Treatment Matters
The default PFIC regime is designed to remove the deferral advantage that a US investor would otherwise gain by investing through a foreign corporation rather than directly. Without the regime, a US person could put assets into a foreign corporation, accumulate income inside the corporation tax-free, and pay only when they sold the shares or received distributions. The PFIC rules close that gap by treating accumulated PFIC income as if it had been distributed and taxed at the highest ordinary rates each year.
In practical terms, holding a foreign mutual fund or foreign ETF in a US-tax-resident portfolio without an election can produce effective tax rates well above the 23.8% maximum capital gains rate that would apply to a similar US-listed fund. A US person who would owe 15% to 20% on a US ETF gain can owe 37% plus interest on the equivalent foreign ETF gain.
3. The Three Tax Regimes
Three different tax frameworks can apply to PFIC holdings, depending on the elections made by the shareholder.
| Regime | Applies When | How It Taxes | Election Form |
|---|---|---|---|
| Default Section 1291 | No election filed | Excess distributions and gain at highest ordinary rate plus interest charge for deferral | None (default) |
| QEF (Qualified Electing Fund) | Timely election + PFIC provides Annual Information Statement | Pro rata share of PFIC's ordinary income and capital gain currently, similar to partnership | Form 8621 |
| Mark-to-Market (MTM) | Election for marketable PFIC stock | Annual gain or loss based on year-end value vs basis, ordinary rates | Form 8621 |
The three regimes produce significantly different outcomes. For a US investor holding a foreign mutual fund with steady appreciation, the QEF election typically produces the best result because long-term gains retain their character. The default regime is the worst because it strips capital gain treatment and adds an interest charge.
4. The Default Section 1291 Regime
If no election is made, every disposition or excess distribution is treated under the Section 1291 rules. Three steps determine the tax:
- Allocate the gain or excess distribution ratably across the entire holding period
- Tax the portion allocated to the current year at the shareholder's ordinary rate
- Tax the portion allocated to prior years at the highest ordinary rate in effect for each prior year, plus an interest charge from each prior year's deemed payment date to the actual disposition date
The interest charge accrues at the rate the IRS uses for underpayments. After several years of holding, the interest component alone can equal or exceed the underlying tax. The mathematics of the regime is designed to make holding a PFIC under default treatment economically irrational.
5. The QEF Election
The Qualified Electing Fund election produces the most favorable tax result in most situations, but requires cooperation from the PFIC.
To qualify, the PFIC must provide an annual PFIC Annual Information Statement (or equivalent acceptable to the IRS) that allows the shareholder to calculate their pro rata share of the PFIC's ordinary income and net capital gain. Many foreign mutual funds and ETFs do not provide such statements. Vanguard's Irish-domiciled ETFs, for example, generally do not produce QEF statements, while a small number of US-marketed funds do.
Under the QEF election, the shareholder includes their share of the PFIC's earnings each year as ordinary income or long-term capital gain, depending on the underlying character. Capital gain character is preserved. The interest charge under Section 1291 does not apply. Tax is paid currently on the earnings, similar to a partnership pass-through.
The election must generally be made for the first year the shareholder holds the PFIC. Late QEF elections require a purging election to remove prior-year Section 1291 taint, which itself can produce gain recognition at the time of purging.
If you have foreign fund holdings and have not run the PFIC analysis, an international tax review confirms what is in scope before the next return is filed.
6. The Mark-to-Market Election
The Mark-to-Market election under Section 1296 is available only for PFICs whose stock is regularly traded on a qualified exchange. Many foreign-listed ETFs qualify; many foreign mutual funds do not.
Under MTM, the shareholder reports the difference between the year-end value of the PFIC stock and its tax basis as ordinary income each year. The basis is adjusted to reflect the inclusion. When the stock is eventually sold, the gain or loss is calculated based on the adjusted basis.
MTM eliminates the Section 1291 interest charge but converts what would have been long-term capital gain into ordinary income. For a foreign ETF held in a portfolio with long appreciation horizons, MTM is generally worse than QEF but better than default Section 1291. For a position held for short-term trading, MTM and ordinary treatment may be similar.
7. Reporting on Form 8621
All three regimes are reported annually on Form 8621, attached to the federal income tax return. There is a de minimis exception for small holdings without distributions or dispositions, but no exception for shareholders who have made a QEF or Mark-to-Market election. Our standalone post on Form 8621 for PFIC holders covers filing requirements per holding, the de minimis threshold, the statute of limitations consequence under IRC Section 6501(c)(8), and late filing relief options.
Other foreign-asset reporting may apply at the same time. Our post on Form 8938 vs FBAR covers the asset disclosure obligations that often run alongside PFIC compliance.
8. Common Scenarios That Create PFIC Exposure
Most US persons who hold PFICs do not know they hold them. The most common patterns:
- US person opens a brokerage account abroad: buying foreign-listed mutual funds or ETFs because they appear cheaper or more diversified than US equivalents. Almost all such funds are PFICs.
- Foreign national becomes a US tax resident with existing investments: any foreign mutual funds, retirement-style investment accounts (such as Indian mutual funds, UK ISAs, Canadian RESPs), or foreign-listed ETFs held at the time of US residency become PFICs from the year of residency.
- US founder accepts foreign company stock as compensation: shares in a foreign holding company with passive investments, or in a foreign corporation that is otherwise predominantly an investment vehicle, can be PFIC stock.
- Inherited foreign investments: US persons inheriting investment accounts or fund holdings from a non-US relative often inherit PFIC exposure as part of the inheritance.
If you are not yet certain of your US tax residency status, that question comes before the PFIC analysis. Our post on US tax residency vs non-residency covers the green card and substantial presence tests.
This post is for general informational purposes only and does not constitute professional tax, legal, or accounting advice for your specific situation. Reading this post does not create a CPA-client relationship. Tax laws are complex and subject to change. If you would like advice tailored to your situation, consult a qualified tax professional, including through the services offered on this site.