Form 8621 is the information return a US person files for each passive foreign investment company, or PFIC, they own shares in, directly or in some cases indirectly. It reports income, gains and elections under the PFIC rules, and a separate Form 8621 is needed for each PFIC. A foreign corporation is a PFIC if 75% or more of its gross income is passive or at least 50% of its assets produce passive income.
The form is famous for being painful, and the reason is the default tax treatment, which is far harsher than ordinary investment tax. Everything below comes from the IRS Instructions for Form 8621 (Rev. December 2025), and the figures are as of October 2026.
Is my foreign fund a PFIC?
A foreign corporation is a PFIC if it meets either of two tests for its tax year.
| Test | What it checks |
|---|---|
| Income test | 75% or more of the corporation's gross income is passive income |
| Asset test | At least 50% of the average percentage of its assets produce passive income or are held to produce it |
The tests look at the company's income and assets, not at your reasons for buying, so a company that mostly holds investments rather than running a business is the classic PFIC. You can also be treated as an indirect shareholder through certain pass-through entities, which is how some people end up filing without ever buying a foreign share directly.
The three ways a PFIC can be taxed
| Regime | How it works |
|---|---|
| Section 1291 fund (default) | No election made. Excess distributions and all gain on sale are spread over your holding period; amounts for earlier PFIC years carry a separate tax plus an interest charge |
| Qualified electing fund (QEF) | You elect to include your share of the fund's ordinary earnings as ordinary income and its net capital gain as long-term capital gain each year, even if nothing is paid out |
| Mark-to-market | For marketable stock: you include each year's rise in fair market value over your adjusted basis as income, and can deduct certain falls |
The default is the expensive one. An excess distribution is the part of this year's distribution that's more than 125% of the average distributions you received in the 3 preceding tax years, or your shorter holding period. The portions allocated to the current year and to years before the company was a PFIC are taxed as ordinary income. The portions allocated to your earlier PFIC years aren't included in income at all; they're subject to a separate tax and interest charge instead. And the entire gain when you sell a section 1291 fund is treated as an excess distribution.
The $25,000 exception
Not every small holding triggers a filing. Broadly, you don't have to file under section 1298(f) for a section 1291 fund if the total value of all your PFIC stock is $25,000 or less, or $50,000 or less on a joint return, on the last day of your tax year, and you didn't receive an excess distribution from it or dispose of it. The same $25,000 test applies at the level of a domestic partnership, trust, estate or S corporation for stock held through it.
The exception doesn't help if you're making an election that's reported in Part II of the form, or if you received an excess distribution or sold shares. Then you file regardless of size.
Who has to file
Generally, a US person who is a direct or indirect shareholder of a PFIC must file Form 8621 for the year if they:
- Receive certain direct or indirect distributions from a PFIC.
- Recognize gain on a direct or indirect disposition of PFIC stock.
- Report information for a QEF or mark-to-market election.
- Make an election reportable in Part II of the form.
- Must file an annual report under section 1298(f).
Here's the exception many people never hear about. If you hold the PFIC through an individual retirement plan or annuity, a section 403(b) or 457(b) plan, a 529 or 530 qualified tuition program, or a qualified ABLE program, you aren't treated as a shareholder of the PFIC. A foreign fund inside an IRA doesn't drag you into Form 8621.
When and where to file
- Attach Form 8621 to your income tax return and file both by the due date, including extensions.
- If you aren't required to file an income tax return for the year, file Form 8621 directly with the Internal Revenue Service Center, Ogden, UT 84201-0201.
- File a separate form for each PFIC, identified by its EIN or a reference ID number.
- Make any QEF or mark-to-market election on the form in the first year it applies, because late elections can bring extra steps such as a deemed sale.
Form 8621 often sits alongside other foreign reporting. Foreign financial accounts may also need an FBAR, and specified foreign assets above the thresholds go on Form 8938. They're separate forms, and filing one doesn't cover the others.
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Mistakes that make PFICs worse
- Assuming a foreign fund is treated like a US mutual fund. It usually isn't.
- Missing the first-year QEF election, which leaves the default regime in place for the shares you already hold.
- Selling at a gain without realising the whole gain is an excess distribution under the default rules.
- Filing one form for several funds. Each PFIC needs its own Form 8621.
The verdict
If you're a US person holding shares in a foreign investment company, test it against the 75% and 50% rules and check the $25,000 exception first. If you're above it, or plan to keep the fund for years, look hard at a QEF or mark-to-market election early, because the default excess distribution rules are designed to remove the benefit of deferring tax. For many people, avoiding the structure altogether is simpler than managing it.
Frequently asked questions
What is Form 8621?
It's the information return a US shareholder files for each passive foreign investment company, reporting income, gains and elections under the PFIC rules.
What makes a foreign fund a PFIC?
It's a PFIC if 75% or more of its gross income is passive, or at least 50% of its assets produce passive income.
Is there a minimum for filing Form 8621?
For a section 1291 fund you generally don't need to file if all your PFIC stock is worth $25,000 or less, or $50,000 or less on a joint return, and you had no excess distribution or sale.
What is an excess distribution?
The part of a distribution that's more than 125% of the average distributions you received in the 3 preceding tax years, or your shorter holding period.
Do I file one Form 8621 for all my funds?
No. A separate Form 8621 must be filed for each PFIC.
Where do I send Form 8621 if I don't file a tax return?
File it directly with the Internal Revenue Service Center, Ogden, UT 84201-0201.
