Passive Foreign Investment Company holdings are taxed under one of three regimes, and unless you make a timely election the default rules apply automatically: ordinary distributions and gains get taxed at the top individual rate (37% for 2026) with a compounded interest charge stretching across your entire holding period. The PFIC tax rules and reporting requirements also demand a separate Form 8621 for each PFIC you own, filed annually with your return. Miss the form and the statute of limitations on that return can stay open indefinitely.
The rules exist to stop U.S. taxpayers from using foreign funds to defer tax on passive earnings. In practice they sweep in ordinary foreign mutual funds and ETFs that most Americans would think of as everyday investments.
What Counts as a PFIC
A foreign corporation is a PFIC in any year it meets either of two tests. The income test looks at whether 75% or more of gross income is passive. The asset test looks at whether at least 50% of the average value of assets during the year produces, or is held to produce, passive income.1Office of the Law Revision Counsel. 26 USC 1297 – Passive Foreign Investment Company Only one test needs to be met. Asset values are generally measured at fair market value.
Passive income tracks the foreign personal holding company income definition in Section 954(c): dividends, interest, rents, royalties, annuities, and gains from selling assets that produce those types of income. Exceptions exist for income earned in the active conduct of banking or insurance and for certain related-party payments.1Office of the Law Revision Counsel. 26 USC 1297 – Passive Foreign Investment Company
The investments most likely to qualify are foreign mutual funds, foreign-domiciled ETFs, and foreign holding companies used mainly for passive investing. A foreign operating business generally won’t meet either test, but a company with a large cash-and-securities reserve can still trip the asset test.
The Three Tax Regimes
Excess Distribution Method (Default)
With no election in place, Section 1291 applies automatically. Any distribution exceeding 125% of the average of the prior three years’ distributions is treated as an “excess distribution,” and so is any gain on the sale of PFIC stock.2Office of the Law Revision Counsel. 26 USC 1291 – Interest on Tax Deferral
The excess is spread ratably across every day of your holding period. The portion allocated to prior years is taxed at the highest individual rate in effect for each of those years, regardless of your actual bracket. On top of that, the IRS charges compounded interest on the tax allocated to prior years at the underpayment rate (the federal short-term rate plus three percentage points, compounded daily).3Internal Revenue Service. Revenue Ruling 2024-25 Only the portion allocated to the current year is taxed at your actual rate. On a ten-year hold, the interest charge alone can add 30% or more to the effective bill.
Qualified Electing Fund (QEF) Election
A QEF election under Section 1293 lets you include your share of the PFIC’s ordinary earnings and net capital gains in income each year, similar to a domestic mutual fund. Ordinary earnings are taxed at your regular rate; capital gains can qualify for the long-term rate.4Office of the Law Revision Counsel. 26 USC 1293 – Current Taxation of Income From Qualified Electing Funds
The catch is that the foreign corporation must cooperate. The election requires a PFIC Annual Information Statement from the company detailing your share of its earnings and gains for the year. Many foreign funds, especially those marketed to non-U.S. investors, simply refuse to produce one. Without the statement, the IRS generally won’t allow the election. That practical barrier is the single biggest frustration in PFIC planning: the best treatment depends on the foreign entity’s cooperation.
Mark-to-Market Election
The mark-to-market election under Section 1296 is available for PFIC stock that is regularly traded on an SEC-registered national securities exchange or on a foreign exchange the IRS deems adequate.5Office of the Law Revision Counsel. 26 USC 1296 – Election of Mark to Market for Marketable Stock It also reaches stock in foreign corporations comparable to a regulated investment company offering redemption at net asset value, to the extent regulations provide.
Each year you include in income the difference between year-end fair market value and your adjusted basis. If the stock drops, you can deduct the loss, but only up to your “unreversed inclusions” — the net mark-to-market gains previously included, minus deductions already taken.5Office of the Law Revision Counsel. 26 USC 1296 – Election of Mark to Market for Marketable Stock Both the income and the allowable losses are ordinary, not capital. You pay tax on paper gains even without a distribution.
The election applies to the election year and every year afterward unless the stock stops being marketable or the IRS consents to revocation. Making the election after the first year of ownership may require a deemed sale under Section 1291 first, to clear the accumulated PFIC taint.
The PFIC Label Sticks
Once a foreign corporation qualifies as a PFIC during any year you hold its stock, the IRS treats it as a PFIC for the rest of your holding period even if it later stops meeting either test. Section 1298(b)(1) codifies this.6Office of the Law Revision Counsel. 26 USC 1298 – Special Rules
Removing the label requires a “purging election,” which is a deemed sale of your shares. You recognize gain as if you sold at fair market value, pay tax and interest under the excess distribution rules, and reset basis and holding period. The election is made on Form 8621 and can be filed with an amended return within three years of the original due date.7eCFR. 26 CFR 1.1297-3 – Deemed Sale or Deemed Dividend Election by a US Person That Is a Shareholder of a Section 1297(e) PFIC Any loss on the deemed sale is not recognized.
Inherited PFIC Stock
Inherited assets normally receive a stepped-up basis to fair market value at the date of death. PFIC stock does not. Section 1291(e) denies the step-up for stock in a PFIC that was a “nonqualified fund,” meaning the decedent had not made a QEF election.2Office of the Law Revision Counsel. 26 USC 1291 – Interest on Tax Deferral
You inherit the decedent’s original basis, and when you sell, the excess distribution rules apply to the full gain, including the compounded interest reaching back through the decedent’s holding period. On a stock held for decades, the interest can dwarf the underlying tax. The step-up is preserved only if the decedent made a QEF election during life, or if the PFIC also qualifies as a controlled foreign corporation with respect to a U.S. shareholder, which triggers a different set of rules.8Internal Revenue Service. Technical Advice Memorandum 199939038
Filing Form 8621
Form 8621 is the primary reporting vehicle for PFIC interests. File a separate form for each PFIC you hold, attached to your annual return, by the return’s due date including extensions.9Internal Revenue Service. Instructions for Form 8621 – Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund Five PFICs means five forms. Electronic filing through the IRS Modernized e-File system is available.
The form asks for the PFIC’s full legal name, address, and employer identification number if it has one. You’ll also need your acquisition date, cost basis converted to U.S. dollars at the exchange rate on the purchase date, the class and number of shares held at the beginning and end of the year, and any distributions received. A QEF filing must include the PFIC Annual Information Statement from the foreign corporation. A mark-to-market filing needs the stock’s fair market value on the last business day of the tax year, supported by exchange data.
If you’re not otherwise required to file a return for the year, you still send Form 8621 to the IRS service center where you would normally file.
When You Can Skip the Form
PFIC stock held inside an IRA, 401(k), 403(b), 457(b) plan, 529 education savings plan, or ABLE account does not make you a shareholder for PFIC purposes, and you don’t file Form 8621 for that stock. The same applies to PFIC stock owned by a tax-exempt organization under Section 501(c).9Internal Revenue Service. Instructions for Form 8621 – Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund
For taxable accounts under the default Section 1291 rules, a de minimis exception lets you skip Part I of Form 8621 if all of the following are true:
- The total value of your PFIC stock is $25,000 or less on the last day of the tax year ($50,000 for joint filers).
- For a specific PFIC you own indirectly, the value is $5,000 or less.
- You did not receive an excess distribution or recognize gain on the sale of the PFIC stock during the year.
The thresholds apply to the aggregate value of all PFIC stock, not each PFIC individually. They only exempt Part I of the form: any taxable event during the year still requires a filing regardless of value.10Internal Revenue Service. Instructions for Form 8621
How PFIC Reporting Interacts With FBAR and Form 8938
PFIC holdings can trigger up to three separate reporting obligations. Form 8621 handles the PFIC-specific tax calculations. The same assets may also appear on the FBAR (FinCEN Form 114) and Form 8938 (Statement of Specified Foreign Financial Assets).
The FBAR requires any U.S. person with foreign financial accounts exceeding $10,000 in aggregate at any point during the year to file FinCEN Form 114. Foreign mutual funds count as reportable accounts; foreign hedge funds and private equity funds do not.11Internal Revenue Service. Comparison of Form 8938 and FBAR Requirements The FBAR goes directly to FinCEN, separately from your tax return. The deadline is April 15 with an automatic extension to October 15, no request needed.12Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
Form 8938 covers specified foreign financial assets, including PFIC stock, above certain dollar thresholds. Single filers living in the U.S. file at $50,000 on the last day of the year or $75,000 at any point during the year; joint filers double those numbers. U.S. taxpayers living abroad file at $200,000/$300,000 individually and $400,000/$600,000 jointly.13Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets If you already report a PFIC on Form 8621, you don’t separately report it on Form 8938; the 8621 filing satisfies the 8938 requirement for that asset.
What Happens If You Don’t File
The largest consequence of missing Form 8621 is that the statute of limitations on your entire tax return for that year can remain open indefinitely. The IRS normally has three years to audit, but the absence of required PFIC disclosures can prevent the clock from starting. A return from a decade ago remains fair game if the form was never filed.
Beyond that, the Section 1291 default regime works as a built-in penalty. Without a timely QEF or mark-to-market election, you’re stuck with the excess distribution method and its compounded interest. The Form 8621 instructions do not list a specific standalone fine for non-filing, but they warn that failure to file required returns can trigger penalties and potential criminal prosecution.10Internal Revenue Service. Instructions for Form 8621
The IRS may grant penalty relief for reasonable cause, but the standard is high. You have to show you exercised ordinary care and were still unable to comply. Fires, natural disasters, serious illness, and inability to obtain records can qualify. Ignorance of the filing requirement, reliance on a tax professional who failed to advise you, and simple mistakes generally do not.14Internal Revenue Service.