Form 8621 is an information return — it reports a US person's interest in a foreign corporation that is a passive foreign investment company (PFIC), and any income, distribution, gain, or election with respect to that interest. Unlike most international information returns, §1298(f) carries no standalone civil penalty; the consequence of not filing is that, under §6501(c)(8), the assessment statute of limitations for the entire return generally does not begin to run until the required information is furnished. The return can stay open indefinitely.
This guide is about the two questions that precede the form's schedules: is this foreign corporation a PFIC, for this US person, for this year — and who, in the ownership chain, actually carries the filing obligation? It works them the way a preparer should: the two §1297 tests first, then the look-through and the CFC overlap that decide whether the tests even apply, then the §1298(f) rules that route the obligation to a specific person, then the de minimis exceptions.
In plain terms PFIC status is mechanical, not a matter of how the company describes itself. A foreign corporation is a PFIC if 75% or more of its income is passive, or 50% or more of its assets are passive — and that is tested every year. The size of the US person's stake is irrelevant: a 1% holder of a PFIC can have a Form 8621 obligation that a 100% owner of an active operating company does not. And ruling out controlled-foreign-corporation (CFC) status does not rule out a PFIC — for many owners it is exactly where the PFIC analysis begins.
Is the foreign company a PFIC? The two tests (§1297(a))
A foreign corporation is a PFIC for a tax year if it meets either of two tests. Either one is sufficient; many PFICs meet both.
the term "passive foreign investment company" means any foreign corporation if— (1) 75 percent or more of the gross income of such corporation for the taxable year is passive income, or (2) the average percentage of assets (as determined in accordance with subsection (e)) held by such corporation during the taxable year which produce passive income or which are held for the production of passive income is at least 50 percent.
— IRC §1297(a)
The income test — 75% passive
If 75% or more of the corporation's gross income for the year is passive, it is a PFIC. Gross income — not net, not distributed.
Example. FC B's gross income for the year is 82% dividends and interest from a portfolio and 18% fees from a small consulting activity. Passive income is over 75% of the total, so FC B is a PFIC on the income test — regardless of how the consulting activity is described, and regardless of who owns FC B.
The asset test — 50% passive (and the cash trap)
Independently, if the average percentage of passive assets is at least 50%, the corporation is a PFIC. The asset test is where companies that look operational are caught, because cash and cash equivalents are passive assets — even working capital, and even cash raised to fund future operations.
Example. FC B is a newly funded foreign company that has raised capital but not yet deployed it; on average over the year more than half its assets are cash and marketable securities. It meets the asset test and is a PFIC, even though management intends to build an operating business. A foreign start-up holding mostly cash, and a shell or special-purpose acquisition vehicle, are routinely caught this way.
The one statutory escape for a genuine start-up is narrow: under §1298(b)(2), a corporation is not a PFIC for the first taxable year it has gross income (its "start-up year") if no predecessor was a PFIC and it is established that the corporation will not be — and is not — a PFIC for either of the next two years. It is a one-year, facts-dependent relief, not a general exemption for early-stage companies.
How the asset test is measured depends on the corporation (§1297(e)): a publicly traded foreign corporation measures by value; a non-publicly-traded CFC must measure by adjusted basis; any other non-publicly-traded corporation measures by value but may elect adjusted basis.
What counts as "passive income" (§1297(b))
Passive income is defined by cross-reference, not from scratch:
the term "passive income" means any income which is of a kind which would be foreign personal holding company income as defined in section 954(c).
— IRC §1297(b)(1)
So the §954(c) foreign-personal-holding-company-income catalog controls — dividends, interest, rents, royalties, annuities, net gains from passive assets and certain property, and the like. Section 1297(b)(2) then carves four categories out of passive income: income from the active conduct of a banking business by a licensed institution; income from the active conduct of an insurance business by a qualifying insurance corporation (defined in §1297(f) — see the currency note below); certain related-person interest, dividends, rents, and royalties allocable to the related person's non-passive income; and export trade income of an export trade corporation.
In plain terms "active business" is not a defense you assert; it is the residue after you classify the income. Rents and royalties are passive unless they fall within the §954(c) active exceptions; interest and dividends from a treasury or holding function are passive; gains on investment assets are passive. Run the company's actual income and balance sheet through the two tests — that is the determination PILOT routes to the right form, though the underlying figures come from the company's financials.
The §1297(c) look-through — a parent is tested on what it owns
A holding company is not tested in isolation. When a tested foreign corporation owns a big enough slice of another corporation, it is treated as owning that lower company's assets and earning its income directly:
If a foreign corporation owns (directly or indirectly) at least 25 percent (by value) of the stock of another corporation, for purposes of determining whether such foreign corporation is a passive foreign investment company, such foreign corporation shall be treated as if it— (1) held its proportionate share of the assets of such other corporation, and (2) received directly its proportionate share of the income of such other corporation.
— IRC §1297(c)
The look-through reaches subsidiaries owned at least 25% by value, and it pulls up the subsidiary's assets and income with their active or passive character intact. Below 25%, there is no look-through: the subsidiary's stock stays a passive asset in the parent's hands, and dividends from it stay passive income.
Example — both directions. FC P is a foreign holding company whose only assets are stock. If FC P owns 30% of FC S, an operating company, FC P looks through to its proportionate share of FC S's active business — which can keep FC P out of PFIC status. Reverse it: if FC P's 30%-held subsidiary is itself an investment vehicle holding portfolio assets, the look-through pulls FC S's passive assets and income up into FC P's tests, and an otherwise active-looking parent can be dragged into PFIC status. The look-through cuts both ways, and it is applied on the real numbers.
In plain terms you cannot judge a foreign parent by its own balance sheet alone. Its ≥25%-owned subsidiaries are folded in, good and bad. A clean-looking holding company over passive subsidiaries can be a PFIC; an investment-looking company over a real operating subsidiary may not be.
CFC or PFIC? The §1297(d) overlap — and why "not a CFC" is not the end
A foreign corporation can be a CFC, a PFIC, or both at once, and the same corporation can be one thing to one owner and another to a second. The overlap rule keeps a single shareholder from being taxed under both regimes:
a corporation shall not be treated with respect to a shareholder as a passive foreign investment company during the qualified portion of such shareholder's holding period with respect to stock in such corporation.
— IRC §1297(d)(1)
The relief is shareholder-specific and runs only for the qualified portion of the holding period — the part that is after December 31, 1997 and during which both the shareholder is a §951(b) US shareholder of the corporation and the corporation is a CFC (§1297(d)(2)). During that period the CFC regime (Form 5471, Subpart F, GILTI) governs and Form 8621 is generally not also required for that shareholder's directly-held stock.
The trap is reading §1297(d) as a property of the corporation. It is not. It protects only a §951(b) 10% US shareholder. Three consequences a generalist routinely misses:
- A sub-10% US owner gets no shield. A US person who owns less than 10% of a corporation that is a CFC as to other shareholders is not a §951(b) US shareholder, gets no §1297(d) relief, and is fully inside the PFIC regime if the corporation meets the §1297 tests.
- "Not a CFC" does not end the inquiry. If the corporation fails the CFC test entirely, no one has §1297(d) protection, and every US owner — however small — must run the PFIC tests.
- A separately-held sub-PFIC is not cleared. Section 1298(a)(2)(B) provides that §1297(d) "shall not apply in determining whether a corporation is a passive foreign investment company for purposes of this subparagraph" — so a §1297(d)-protected US shareholder of CFC X who indirectly owns a different PFIC through CFC X can still have a Form 8621 obligation as to that lower PFIC. (The overlap relief also does not extend to option holders.)
Example — the pass-through pattern. Domestic partnership P owns 100% of FC B, which is a CFC. Because P is itself the §951(b) US shareholder, §1297(d) protects P, which reports FC B on Form 5471. USP A is a 5% partner in P — not a 10% US shareholder of FC B and not protected. If FC B meets the §1297 tests, FC B is a PFIC as to USP A. Whether A must file annually then turns on how A holds the stock (next section): here A owns through a domestic US person, so A is an event-driven filer; had A invested through a foreign fund instead, A would be an annual filer. Either way, the partnership's Form 5471 does not make A's PFIC exposure disappear. See the companion guide, Who must file Form 5471, and what category applies?, for the CFC and US-shareholder mechanics this builds on.
In plain terms "it's a CFC, so there's no PFIC problem" is only true for the 10% US shareholders. The minority US investors — the 5% partner, the 2% co-investor — are usually the ones with the Form 8621 obligation, precisely because the overlap rule was never written to protect them.
Once a PFIC, always a PFIC (§1298(b)(1))
PFIC status is sticky at the level of a particular block of stock held by a particular taxpayer:
Stock held by a taxpayer shall be treated as stock in a passive foreign investment company if, at any time during the holding period of the taxpayer with respect to such stock, such corporation (or any predecessor) was a passive foreign investment company which was not a qualified electing fund.
— IRC §1298(b)(1)
Once a corporation has been a PFIC during a US person's holding period, it stays a PFIC as to that person for the rest of the holding period — even if it no longer meets the §1297 tests in the current year. The parenthetical "which was not a qualified electing fund" is the escape: if a §1295 QEF election was in effect for every PFIC year, the taint does not perpetuate.
Example. USP A buys into FC B in Year 1, when FC B meets the asset test. By Year 3, FC B is operating and meets neither test. Absent a QEF election from the start or a purging election, FC B remains a PFIC as to USP A in Year 3 and beyond — the current-year "no" does not clear the prior taint.
A US person can break the taint with a purging election — generally a deemed sale (or, for a former PFIC that has become a CFC, a deemed dividend) under Treas. Reg. §1.1298-3 (former PFIC) or §1.1297-3 (a §1297(e)/CFC-transition PFIC), made on Form 8621, Part II. The gain recognized on a purge is taxed under the §1291 regime; the computation is downstream work for the engagement's tax professional, not part of the filing-obligation determination. (Note the authority: the purge is built on those Treasury regulations — there is no §1298(b)(1)(B); §1298(b)(1) is a single, unsubdivided paragraph.)
The three regimes: §1291, QEF, and mark-to-market
PFIC stock is reported under one of three regimes. Which regime applies changes the schedules and the tax, but it does not change whether a Form 8621 obligation exists — and the elections that move a shareholder between regimes are downstream planning, evaluated in Professional review, not part of the filing determination here.
- §1291 — the default excess-distribution regime. With no election, distributions above a threshold (an "excess distribution" is, broadly, the part of the year's distributions exceeding 125% of the prior three years' average) and gains on disposition are spread ratably over the holding period, taxed at the highest rates in effect for the back years, and hit with an interest charge for the deferral. It is deliberately punitive. Reported on Part V.
- §1295 — the qualified electing fund (QEF) election. The shareholder elects to include, currently and annually, its pro-rata share of the PFIC's ordinary earnings and net capital gain (the inclusion itself is imposed by §1293(a)) — much like a passthrough. It requires the PFIC to supply a PFIC Annual Information Statement, so it is only practical with the company's cooperation. Reported on Part III.
- §1296 — the mark-to-market (MTM) election. Available only for "marketable stock" (generally stock regularly traded on a regulated exchange — §1296(e)), the shareholder marks the stock to fair value each year, including gains in income and deducting declines to the extent of prior inclusions. Reported on Part IV.
In plain terms the three regimes are about how the income is taxed, not whether you file. A QEF or mark-to-market election can soften the §1291 default, but each has eligibility limits (a QEF needs company cooperation; mark-to-market needs publicly traded stock) and timing rules, and choosing among them is tax-planning work for the professional. PILOT's job is the prior question — that a Form 8621 is required, for whom, and why.
Who must file Form 8621, and when (§1298(f) / Reg §1.1298-1(b))
The statute states the obligation broadly:
Except as otherwise provided by the Secretary, each United States person who is a shareholder of a passive foreign investment company shall file an annual report containing such information as the Secretary may require.
— IRC §1298(f)
But "each United States person who is a shareholder" does not mean every US person in the chain files every year. Reg §1.1298-1(b) splits shareholders into two classes, and the split is the single most-missed point on Form 8621.
The annual filers — §1.1298-1(b)(1)
A US person has the annual obligation — files every year it holds the stock, subject to the exceptions below — if it:
(i) Directly owns stock of the PFIC; (ii) Is an indirect shareholder … that holds any interest in the PFIC through one or more entities, each of which is foreign; or (iii) Is an indirect shareholder … treated under sections 671 through 678 as the owner of any portion of a [domestic grantor] trust … that owns, directly or indirectly through one or more entities, each of which is foreign, any interest in the PFIC.
— Treas. Reg. §1.1298-1(b)(1)
The load-bearing words are "each of which is foreign." A US person who owns the PFIC through an all-foreign chain is the first US person in that chain and files annually. A US person who owns the PFIC through a domestic partnership or S corporation is not a (b)(1) annual filer — the domestic pass-through is itself the first US person and files at its own level (Form 1065 / 1120-S).
The event-only filers — §1.1298-1(b)(2)
A US person who owns the PFIC "through one or more United States persons" — the partner of a domestic partnership, the shareholder of an S corporation that holds the stock — is not an annual filer. It files only in a year in which it is treated as (A) receiving a §1291 excess distribution, (B) recognizing §1291(a)(2) disposition gain, (C) required to include a §1293(a) QEF amount, (D) required to include or deduct a §1296(a) MTM amount, or (E) required to report a §1294 election. For the (C) and (D) inclusion cases, the upper-tier person is relieved when the entity it holds through timely files Form 8621 — except, for a QEF inclusion, where that domestic partnership or S corporation made no QEF election, in which case the partner must file to make and report its own.
Example (mirrors the regulation's own Example 1). USP A owns FC B (a PFIC) two ways: through domestic partnership P, and through foreign partnership Q. As to the interest held through Q, A is the first US person in an all-foreign chain — a (b)(1)(ii) annual filer — so A files Form 8621 every year for that interest. As to the interest held through P, A is a (b)(2) shareholder; the partnership P files Form 8621 at its level, and A files for that interest only in a year with a §1291 event or a required QEF/MTM inclusion. The fact that P files does not relieve A's annual obligation on the Q interest.
In plain terms before you decide a client must file, find the first US person standing between them and the foreign company. If the client is that person — they own it directly, or only through foreign entities — they file every year. If a US partnership or S corporation sits in between, that entity files, and the client files only when something actually happens (a sale, a distribution, an election). Anchoring the obligation to the wrong person is the classic Form 8621 error.
The de minimis and other exceptions (Reg §1.1298-1(c))
Even an annual filer can be excused. The most common reliefs from §1298(f) reporting:
- $25,000 / $50,000 de minimis. No Form 8621 for a §1291 fund if the aggregate value of all PFIC stock the shareholder owns (directly and indirectly) is $25,000 or less on the last day of the year ($50,000 on a joint return), and there was no excess distribution or disposition gain for the year, and no QEF election is in effect. (For PFIC stock owned only indirectly through another PFIC, a separate $5,000 threshold applies.)
- Tax-exempt shareholders whose PFIC income would not be taxable (e.g., income that is not unrelated business taxable income).
- Treaty-protected foreign pension funds, dual-resident taxpayers taxed as nonresident aliens, certain US-territory residents, and stock marked to market under a non-§1296 provision (such as a §475 dealer mark).
- Short-term holdings of a §1291 fund (30 days or less in the surrounding window, with no excess distribution).
Example (mirrors the regulation's Example 2). USP A directly owns three PFICs worth $5,000, $10,000, and $4,000 at year-end, has a QEF election on the first and a mark-to-market election on the second, and has no distribution or disposition on the third. A files for the QEF and MTM stocks (those elections are never relieved by de minimis), but the third — a §1291 fund — qualifies for de minimis relief because the shareholder's total PFIC stock ($19,000) is under the $25,000 aggregate threshold, so no Form 8621 is required for it.
In plain terms the de minimis test is a single yes/no: is the total value of the client's PFIC stock over the threshold on the last day of the year? It is a threshold, not a computation — which is exactly how PILOT asks it, and the conservative answer (file) is the safe one when the value is unknown.
What OBBBA and recent law changed
PFIC determinations are year-dependent, and the most important recent change reaches PFIC status through the CFC rules.
- OBBBA (Pub. L. 119-21) §70353 — restoration of §958(b)(4), for foreign-corporation tax years beginning after December 31, 2025. The 2017 Act had repealed §958(b)(4), turning on "downward" attribution from foreign persons and creating "foreign-controlled CFCs" — corporations that were CFCs only because of that downward attribution. OBBBA restores §958(b)(4) for 2026 and later years. The PFIC consequence: a corporation that was a CFC only by downward attribution can cease to be a CFC for 2026+, which switches off the §1297(d) overlap for its US shareholders — so a structure that was reported on Form 5471 and shielded from the PFIC rules for 2024–2025 can produce a new Form 8621 / PFIC obligation for 2026. Re-run CFC status, and therefore the PFIC overlap, under the rules in effect for the foreign corporation's tax year.
- The insurance exception runs on the §1297(f) "qualifying insurance corporation" test added by the Tax Cuts and Jobs Act (Pub. L. 115-97, §14501(b), 2017), effective for tax years beginning after December 31, 2017 (final regulations in 2021). The same Act recast the §1297(b)(2)(B) active-insurance exception to run through the §1297(f) test, which requires — among other things — that applicable insurance liabilities be more than 25% of total assets, a meaningful tightening for foreign insurance and reinsurance structures.
- Domestic pass-throughs — watch the pending regulations. Final regulations in 2022 (T.D. 9960) adopted aggregate treatment of domestic partnerships and S corporations for Subpart F and GILTI, and proposed regulations (REG-118250-20, 87 FR 3890) would extend a similar aggregate approach to the PFIC rules — moving PFIC elections and Form 8621 reporting down from the domestic partnership/S corporation to its partners/shareholders. Those PFIC proposals remain proposed, not finalized, so the current "first US person files" routing above governs; if finalized, the who-files analysis for domestic pass-throughs would shift.
Relationships to other regimes and forms
Form 8621 rarely stands alone. Two questions sit on either side of it.
Is it even a corporation? (classification comes first)
The PFIC rules apply only to a foreign corporation. Before running §1297, classify the entity: a per se corporation is always a corporation; any other foreign entity has a default classification under the check-the-box rules (corporation, partnership, or disregarded entity) and may elect out on Form 8832. If the entity is a foreign partnership, the analysis points to Form 8865, not Form 8621; if a foreign disregarded entity, to Form 8858. (PFIC status can still reach a US partner through those entities, but the entity-level form differs.)
Form 5471 and the CFC analysis feed §1297(d)
Because the §1297(d) overlap turns entirely on whether the corporation is a CFC and whether the US person is a §951(b) 10% US shareholder, the CFC determination is a prerequisite to the PFIC answer for any 10%-or-greater US owner. Those mechanics — the 10% US-shareholder test, the more-than-50% CFC test, and the §958 attribution that drives both — are worked in the companion guide, Who must file Form 5471, and what category applies?. The two analyses are run together: confirm the CFC picture, then apply §1297(d), then test PFIC status for everyone the overlap does not reach.
The forms PFIC work travels with
A US person who owns PFIC stock through foreign accounts or entities frequently also has Form 8938 (specified foreign financial assets), FBAR (FinCEN Form 114), and — where a foreign partnership is in the chain — Schedule K-2 / K-3 and Form 8865 exposure. The PFIC determination should be run as part of the whole engagement, not in isolation. For how those two foreign-asset disclosures differ — and why the same foreign fund can land on both at once — see FBAR vs Form 8938: who files which, and how do they differ?.
Penalties and the statute of limitations
- No standalone §1298(f) civil penalty. Unlike §6038 (Form 5471) or §6038D (Form 8938), the PFIC annual-report statute does not impose its own dollar penalty.
- §6501(c)(8) — the real consequence. Reg §1.1298-1(d) is explicit: "In the case of any failure to report information that is required to be reported pursuant to section 1298(f) and these regulations, the time for assessment of tax will be extended pursuant to section 6501(c)(8)." The limitations period for the entire return generally does not start until the Form 8621 information is filed — so an unfiled Form 8621 can hold the whole year open.
- Substantive tax and the interest charge under the §1291 regime, and accuracy-related penalties on any underpayment, are downstream of the filing determination and are evaluated in Professional review.
What Form 8621 is not
Form 8621 reports — it does not, by itself, optimize your client's tax. The choice between the §1291 default, a QEF election, and a mark-to-market election, the excess-distribution and interest-charge computations, and any purging-election gain are separate, downstream work that builds on the facts the determination captures. The first question — and the one this guide answers — is whether a Form 8621 obligation exists at all: whether the foreign corporation is a PFIC, for which US person, and under which filing rule.