PFICs Explained: Why Americans Abroad Can't Invest in Foreign Index Funds Like Everyone Else

Key takeaways

• Many foreign funds, including some local index and mutual funds, are likely to be passive foreign investment companies (PFICs) for a US taxpayer under IRC §1297.
• Without an election, the default regime in IRC §1291 can tax gains at the highest rate for earlier years and add an interest charge.
• Two elections can change the result, a qualified electing fund (QEF) election under §1295 and a mark-to-market election under §1296, each with practical limits.
• Form 8621 is a separate annual reporting duty under §1298(f), and an unfiled form can keep the statute of limitations open under §6501(c)(8).
• US-domiciled funds are generally not PFICs, but access from abroad can be difficult, and a few points in this guide note where the sources did not give a complete answer.

What is a PFIC, and why does it matter to Americans abroad?

A PFIC (passive foreign investment company) is a foreign corporation that earns mostly passive income or holds mostly passive assets, and US shareholders in one are taxed under a separate, harsher regime. The definition is in 26 U.S.C. § 1297(a). A foreign corporation is a PFIC if either test is met for the year:

• Income test: 75% or more of its gross income is passive income.
• Asset test: at least 50% of its assets, by average percentage, produce passive income or are held to produce it.

Passive income means income that would be foreign personal holding company income under section 954(c): dividends, interest, royalties, rents and annuities, plus net gains from selling property that produces that income, and certain commodity and currency gains (26 U.S.C. § 954(c)). If a foreign corporation owns at least 25% of another corporation, it is treated as holding its share of that corporation's assets and income (§ 1297(c)).

Why this catches funds. A foreign fund organized as a corporation holds securities, and securities produce dividends, interest and gains, which are passive income. So a fund of that kind generally meets the tests. The IRS signals this in Publication 54: an individual who owns a mutual fund or ETF that is not domiciled in the United States may have a Form 8621 obligation (IRS Publication 54, December 2025). The IRS instructions do not list funds by name; whether a particular fund is a PFIC depends on how it is organized and classified for US purposes.

Why Americans abroad meet PFICs most often. Any US person can own a PFIC, but the funds sold by local banks, brokers and employers are usually domiciled outside the United States. This is a general observation, not an IRS statement.

Once a PFIC, always a PFIC. Stock is treated as PFIC stock for your whole holding period if the company was a PFIC at any point while you held it and was not a qualified electing fund, unless you elect to recognize gain (26 U.S.C. § 1298(b)(1)). A fund that stops meeting the tests later can still be a PFIC for you.

Which investments are PFICs, and which are not?

Foreign funds are the usual problem; US-domiciled funds are not. The table applies the statutory tests to common cases. Each row is an application of the rules above, not a list published by the IRS.

Investment	PFIC?	Why
Foreign-domiciled mutual fund or ETF organized as a corporation	Generally yes	A foreign corporation whose assets and income are mostly securities, which produce passive income. Publication 54 warns of a Form 8621 obligation for non-US-domiciled funds
US-domiciled mutual fund or ETF	No	The definition requires a foreign corporation (§ 1297(a))
Shares of an operating foreign company	Generally no	Its income and assets are mostly from an active business, so it normally fails both tests
A foreign company holding mostly cash or investments	Can be	The income test or the asset test can be met even by a small or early-stage company
Foreign fund held inside a qualifying retirement plan or 529 plan	Not treated as your holding	The instructions say holders through certain tax-exempt organizations or accounts are not treated as shareholders (Form 8621 instructions)
Fund held through a foreign corporation, a pass-through entity or another PFIC	Can be, indirectly	The instructions treat certain indirect owners as shareholders who must file

Two cautions. First, a fund's legal form matters: how a foreign fund is classified for US tax purposes decides whether it is a corporation, so the label "ETF" or "index fund" alone does not answer the question. (Classification of specific fund structures, such as European UCITS vehicles, is not covered by the IRS pages used in this guide.) Second, the funds you hold may change status over time, which is why the "once a PFIC, always a PFIC" rule matters.

The default tax regime: excess distributions and the interest charge

If you make no election, a PFIC is taxed under section 1291, which treats a large distribution or a sale as if the income had been earned evenly over your holding period, taxed at the top rate, with interest. The rules are in 26 U.S.C. § 1291.

1. What triggers it. An excess distribution is the part of a year's distributions that exceeds 125% of the average distributions you received over the three preceding years (or the shorter holding period). Gain on selling PFIC stock is treated the same way as an excess distribution.
2. Spread over the holding period. The excess distribution is allocated ratably to each day of your holding period.
3. Current-year share. The amount allocated to the current year is ordinary income this year. (Amounts allocated to periods before the company's first PFIC year beginning after 1986 are treated the same way.)
4. Earlier-year shares. Amounts allocated to earlier years are not added to this year's income. Instead, this year's tax increases by a deferred tax amount: each allocated amount multiplied by the highest rate of tax in effect for that earlier year.
5. Interest. The deferred tax amount also includes interest on those tax increases, from the due date of each earlier year's return to the due date of the current year's return, at the underpayment rates under section 6621.

The combined effect is that a gain you realize after many years is taxed as though it had been earned evenly at the top rate, with interest on the part treated as earned in earlier years, rather than at the capital gain rates a US-domiciled fund would give you. The longer you hold, the larger the share of the gain that carries the interest charge.

The IRS instructions for Form 8621 explain how the form computes these amounts (Form 8621 instructions, revised December 2025).

The two elections: qualified electing fund and mark-to-market

Two elections let you avoid the default regime for a given PFIC: the qualified electing fund (QEF) election and the mark-to-market election. Both are made on Form 8621, Part II (Form 8621, revised December 2025). Each trades the default regime's interest charge for current inclusion of income.

	Default (§ 1291)	QEF election (§ 1295)	Mark-to-market (§ 1296)
When income is taxed	On an excess distribution or sale	Every year, whether or not distributed	Every year, on unrealized change in value
What is included	The excess distribution or gain, allocated over the holding period	Your share of the fund's ordinary earnings as ordinary income, and of its net capital gain as long-term capital gain	The excess of year-end fair market value over adjusted basis, as ordinary income
Losses	As otherwise allowed	Not covered in the IRS instructions used here	A deduction for a decline in value, limited to prior inclusions not yet reversed; ordinary
Interest charge	Yes	No	No
What the investment must satisfy	Nothing	The fund must meet requirements the Treasury prescribes to compute ordinary earnings and net capital gain	The stock must be marketable: regularly traded on a qualifying exchange, or in certain specified categories
Election deadline	None	Generally by the due date, including extensions, of the return for the first year it applies; late elections are limited	By the due date, including extensions, of the return for the first year the stock is marked to market
One election per		Each PFIC	The marketable stock

Sources: Form 8621 instructions; § 1295; § 1296.

What this means in practice:

• QEF depends on the fund. The election works only if the fund gives you the figures the rules require. Many foreign funds do not provide them. This is a general observation, not an IRS statement.
• Mark-to-market depends on the market. Exchange-listed foreign ETFs may qualify as marketable stock; funds that are not traded on a qualifying exchange generally do not.
• Timing is unforgiving. Both elections are tied to the return for the first year they apply. If you already held the fund, earlier years can remain under the default regime. Form 8621 Part II also offers deemed-sale and deemed-dividend elections that professionals use to reset a fund's status (Form 8621); the statute's gain-recognition election is in § 1298(b)(1).
• Neither election removes tax. They change when and how income is taxed, and QEF and mark-to-market inclusions can arise without any cash distribution.

Reporting on Form 8621: who files, exceptions, and why the statute of limitations stays open

A PFIC investment creates two separate obligations: paying tax under whichever regime applies, and reporting the holding. The reporting obligation is its own rule, and it can matter even when no tax is due.

• Who files. Under IRC §1298(f), a US person who is a shareholder of a PFIC generally must file an annual report with the IRS, on Form 8621, for each tax year in which the person owns PFIC stock directly or in specified indirect ways. Form 8621 is filed once for each PFIC, not once per account. A client with five PFIC funds generally has five forms to prepare.
• When it is due. Form 8621 generally accompanies the shareholder's income tax return for the year, so the deadline follows the return, including extensions. The Form 8621 instructions (revised 12/2025) say to attach the form to the tax return and to file by the return's due date, including extensions. If no return is required, the form is filed directly with the IRS at Ogden, UT. Treas. Reg. §1.1298-1(d) says the same and adds that the §6501(c)(8) extension applies to a failure to report.
• The exceptions. The Treasury regulations (Treas. Reg. §1.1298-1) relieve some shareholders of the annual filing duty. The best known is the small-holding exception, with thresholds of $25,000 for a single filer and $50,000 for a joint return, measured on the total value of PFIC stock at year end, and a lower $5,000 threshold for PFIC stock held through another PFIC. The exception does not apply if the shareholder received an excess distribution, sold the stock at a gain, or made a QEF or mark-to-market election for that PFIC. A shareholder who relies on an exception should confirm the current regulation text and the Form 8621 instructions; the thresholds and conditions are specific and easy to misread.
• The filing is not the tax. Filing Form 8621 does not by itself change the tax regime. A shareholder who files without a QEF or mark-to-market election remains under the default §1291 regime.
• The statute of limitations. Under IRC §6501(c)(8), if a required international information return is not filed, the period for assessing tax on the related items does not start to run until the information is provided, and then generally runs for three more years. In practice, an unfiled Form 8621 can leave an entire year open, not only the PFIC items. This is why clients who discover old PFIC holdings are often advised to correct the filings rather than leave them.
• No simple penalty figure. This guide does not state a dollar penalty for failing to file Form 8621, because none was confirmed in the primary sources reviewed. (Whether any specific penalty applies, and how the §6501(c)(8) consequence interacts with other penalties.)

For clients who have not filed for past years, the Streamlined Filing Compliance Procedures can be one route, subject to their own eligibility rules. See the guide on Streamlined Filing Compliance Procedures.

A worked example: what the default regime does to a $100,000 gain

This example is simplified on purpose. It shows the mechanics of IRC §1291, not a real client's result.

Assumptions. A US taxpayer buys shares in a foreign fund that is a PFIC. No election is made. The shares are held for exactly five tax years, then sold for a gain of $100,000. There were no distributions. The highest individual rate is assumed to be 37% in every year held (the top rate shown on the IRS rate tables for recent years; earlier years had different top rates, and §1291 uses the highest rate in effect for each year). Interest under §6621 is not calculated.

Step	Amount	Treatment
Gain on sale	$100,000	Treated as an excess distribution, spread evenly across the 5 years held
Allocated to each year	$20,000	$100,000 ÷ 5
Current year (year 5)	$20,000	Taxed as ordinary income at the taxpayer's normal rate
Earlier years (years 1 to 4)	$80,000	Not added to income. A separate tax is computed instead
Deferred tax on earlier years	$29,600	$20,000 × 37% × 4 years
Interest charge	Not computed	§6621 underpayment rate, applied to each earlier year's tax from that year's due date

What the example shows.

• The $29,600 is tax on $80,000 of the gain, which is an effective rate of 37% before interest. A long-term capital gain on a US-domiciled fund might instead have been taxed at a lower rate (the maximum long-term capital gains rate is 20%, plus the net investment income tax where it applies).
• The earlier-year amounts are taxed at the top rate even if the taxpayer's real income in those years was low.
• The interest charge comes on top. It grows with the length of the holding period, so the same gain held for ten years is worse than for five.
• The sale is not the only trigger. A large distribution can also create an excess distribution, as the section on the default regime explains.

NIIT and foreign tax credit. Treas. Reg. §1.1411-10(c) includes the dividend part of an excess distribution, and gains treated as excess distributions under §1291(a)(2), in net investment income, so the 3.8% tax can apply on top of the figures above. Under §1291(g), foreign tax on an excess distribution is spread across the holding period; the part allocated to earlier years reduces the deferred tax increase for those years and is not taken into account under §901. The example does not compute either effect. It is not a prediction for any real portfolio.

What Americans abroad can do in practice

There is no way around the PFIC rules for a fund that is a PFIC. The lawful options are to avoid owning one, or to own one and choose the least costly regime. These are the main routes, with their limits.

• Hold investments that are not PFICs. A fund organized in the United States, such as a US mutual fund or exchange-traded fund, is generally not a PFIC. The IRS's Publication 54 notes that a foreign mutual fund is one that is not domiciled in the United States, which is the starting point for spotting the problem. Individual stocks of operating companies are generally not PFICs, though a foreign holding or investment company can be.
• Make a QEF election. Under IRC §1295, the shareholder reports a share of the fund's ordinary earnings and net capital gain each year. This requires the fund to provide the information the shareholder needs. Many foreign funds do not provide it. (A commercial tax-preparation site reports that the statement is not automatic, that large providers such as Vanguard Canada and iShares Canada publish them, and that many Irish- and other European-domiciled ETFs do not. Without the statement the shareholder cannot maintain a QEF election for that year. No primary source on how common statements are was found.)
• Make a mark-to-market election. Under IRC §1296, available for PFIC stock that is marketable, the shareholder reports yearly gain or loss as ordinary income. It avoids the interest charge but changes the timing and character of the income. Some shares will not qualify as marketable stock. (Which specific funds or exchanges qualify is not confirmed by the sources reviewed.)
• Make a purging election where available. If a shareholder who was already under the default regime later wants to switch, special rules may apply. This is a technical area that should be handled by a professional. The statute does not use the word "purging". Two gain-recognition elections are in the text. Under IRC §1291(d)(2)(A), when a PFIC becomes a QEF for a shareholder, the shareholder may elect to recognize gain as if the stock were sold on the first day of that year at fair market value; basis rises by the gain and the holding period restarts. Under §1298(b)(1), a shareholder can elect to recognize gain when the company stops being a PFIC. The Form 8621 instructions (rev. 12/2025) list these as Part II elections (deemed sale and deemed dividend) with a deadline of the original return's due date, including extensions. The gain recognized is taxed under the §1291 rules, so the election has a cost. (Which election suits a given fact pattern depends on your specifics and is not addressed by the sources reviewed.)
• Check the structure before assuming. Whether a particular fund (for example a European UCITS fund) is a PFIC depends on its facts under §1297, which tests the fund's income and assets. A broker-adjacent fintech site states that most UCITS ETFs are treated as PFICs, giving the reason that they primarily earn passive income, according to a secondary, undated source. No primary source classifying UCITS funds was found, so this guide does not state it as a rule. (The status of any specific fund is not confirmed by the sources reviewed.)
• Access to US funds from abroad. Many Americans abroad find that a local broker will not sell them US-domiciled funds, or will not accept them as clients at all. Two separate obstacles exist. First, EU/UK PRIIPs rules: a justETF article of March 28, 2018 explains that US-domiciled ETFs generally lacked the Key Information Document required for retail investors, so many European online brokers stopped offering them, and implementation varies by country (per a 2018 source, which may be out of date). Second, some institutions decline US-person clients; this is reported by commercial and advocacy sources, but no primary source or specific broker policy was confirmed. (The current rules for a given broker or country. Check with the broker.)

The choice depends on the client's facts: size of the holding, how long it has been held, whether the fund supplies QEF data, and the client's tax rates. This guide does not recommend one route.

Mistakes Americans commonly make with PFICs

1. Not realizing a foreign fund is a PFIC. A local index fund, a pension-linked fund or a savings product can qualify. The tax return software does not flag it, and the foreign bank statement will not mention it.
2. Treating the fund like a US fund. Reporting only the distributions received, or only the gain on sale at capital gains rates, ignores §1291.
3. Not filing Form 8621. Under §1298(f) the report is a separate duty, and the §6501(c)(8) limitations rule means the omission can keep a year open.
4. Making an election late or without the data. A QEF election needs the fund's annual information. Without it, the election may not be workable.
5. Assuming the small-holding exception applies. The thresholds ($25,000 single, $50,000 joint) have conditions. A sale at a gain or a distribution can take the shareholder outside the exception.
6. Forgetting indirect ownership. PFIC stock held through a trust, partnership or another entity can still create a reporting duty. (The specific attribution rules for each structure are not covered by the sources reviewed.)
7. Selling in a panic. Selling a fund with a large built-in gain can trigger the full default-regime calculation. The timing of a sale should be planned with a professional.
8. Skipping the question of past years. A client who finds old PFIC holdings should not simply start filing correctly from now on without asking how earlier years are handled.

Frequently asked questions

What is a PFIC?

A passive foreign investment company, defined in IRC §1297. A foreign corporation generally qualifies if at least 75% of its gross income is passive income, or at least 50% of its assets produce or are held to produce passive income. Foreign mutual funds and similar pooled vehicles commonly meet the test.

Why can't Americans abroad just buy a local index fund?

They can legally, but the fund is likely to be a PFIC, which brings the default §1291 regime, an interest charge and Form 8621 reporting. That is why many advisers suggest looking at US-domiciled funds or at the elections.

Are US mutual funds and ETFs PFICs?

Generally no, because they are domiciled in the United States. Publication 54 describes the foreign mutual fund problem as one that is "not domiciled in the United States."

Do I have to file Form 8621 if I hold a small amount?

Possibly not. A small-holding exception exists ($25,000 single, $50,000 joint, $5,000 for indirect holdings), but it has conditions. Check the current regulation and form instructions.

What is the difference between QEF and mark-to-market?

QEF (§1295) taxes the shareholder on the fund's yearly earnings and requires fund data. Mark-to-market (§1296) taxes yearly unrealized gain as ordinary income and requires marketable stock.

Can I fix past years?

Possibly. Options depend on the facts, and the Streamlined Filing Compliance Procedures may apply in some cases. A professional should assess which route fits.

When to hire a professional

PFIC rules are among the more technical parts of US international tax. A professional is generally worth consulting in these cases:

• A large or long-held position in a foreign fund, where the default regime could produce a large tax and interest charge.
• A planned sale or a large distribution from a fund held without an election.
• Past years not reported. A CPA, enrolled agent or tax attorney with international experience can assess the options, including the streamlined procedures.
• A QEF or mark-to-market election or a change between regimes.
• Complex holdings, such as funds held through a trust, a company or a foreign pension.

A tax attorney is the usual choice where there is a risk of penalties or enforcement. A CPA or enrolled agent with international experience can usually handle the annual preparation of Form 8621.

Sources

All sources accessed October 8, 2026. Page dates are given only where the page showed one; otherwise the cell says so.

Source	URL	Used for	Page date
IRC §1291 (Interest on tax deferral)	https://www.law.cornell.edu/uscode/text/26/1291	Default regime, excess distribution, interest charge. Secondary host (Cornell LII), not the official code site.	Not shown
IRC §1295 (QEF election)	https://www.law.cornell.edu/uscode/text/26/1295	QEF election. Secondary host.	Not shown
IRC §1296 (Mark-to-market)	https://www.law.cornell.edu/uscode/text/26/1296	Mark-to-market election. Secondary host.	Not shown
IRC §1297 (PFIC definition)	https://www.law.cornell.edu/uscode/text/26/1297	75% income and 50% asset tests. Secondary host.	Not shown
IRC §1298 (Special rules)	https://www.law.cornell.edu/uscode/text/26/1298	§1298(f) annual reporting duty. Secondary host.	Not shown
IRC §6501(c)(8)	https://www.law.cornell.edu/uscode/text/26/6501	Statute of limitations extension for unfiled international information returns. Secondary host.	Not shown
About Form 8621 (IRS)	https://www.irs.gov/forms-pubs/about-form-8621	Form and instructions.	Not recorded
IRS Publication 54	https://www.irs.gov/publications/p54	Foreign mutual fund note (not domiciled in the United States).	Not recorded
Treas. Reg. §1.1298-1	https://www.ecfr.gov/current/title-26/section-1.1298-1	Small-holding exceptions (paragraph (c)(2)).	Not recorded
IRS individual income tax rates	https://www.irs.gov/filing/individual-income-tax-rates-and-brackets	Top rate assumption in the worked example.	Not recorded

A note on scope: this guide is general information, not tax or legal advice. Whether a specific fund is a PFIC, which election fits your situation, and how to handle past years all depend on your own facts and on data your fund may or may not provide. Get advice from a CPA, enrolled agent or tax attorney with international experience before you file Form 8621 or make an election.