Do I have to file Form 8621 every year for my UK funds?

Not necessarily. The Instructions for Form 8621 contain an exception under which a shareholder is not required to complete Part I for a specific section 1291 fund if the aggregate value of all their PFIC stock is $25,000 or less on the last day of the tax year, $50,000 or less for joint filers, and they received no excess distribution from and recognised no gain on the disposition of that fund. Where Part I is the only part you would have completed, no form is required for that fund for that year. If you have a distribution to report, a disposal, or a QEF or mark-to-market election in force, the exception does not help.

Is the $25,000 test applied per fund or across my whole portfolio?

The value test is aggregate. The instructions require the shareholder to take into account all PFIC stock owned directly or indirectly, including QEFs, section 1291 funds and stock subject to a section 1296 mark-to-market election, other than PFIC stock owned through another US person or through another PFIC. The relief is then applied to a specific section 1291 fund. So you clear a portfolio-level gate first, then test each fund individually for an excess distribution or a recognised disposition gain.

Does an ordinary dividend from a UK OEIC count as an excess distribution?

Usually not, but it depends on your own distribution history for that holding. The Instructions for Form 8621 define an excess distribution as the part of the current year distribution from a section 1291 fund that exceeds 125 percent of the average distributions received in respect of that stock by the shareholder during the three preceding tax years. A steady income OEIC paying broadly in line with prior years will normally fall below that line. A holding with little or no three-year history behind it is more exposed, so check the current instructions for how the early years of a holding period are treated.

I sold one small fund during the year. Do I now file for all of them?

No, provided you are still within the aggregate value ceiling on the last day of the tax year. The exception is drafted with respect to a specific section 1291 fund, so the disposal condition is tested fund by fund. The fund you sold fails the condition and needs a Form 8621 with the disposition reported. The remaining funds can still rely on the exception if they had no excess distribution and no disposal of their own and the portfolio as a whole is under $25,000, or $50,000 on a joint return.

If I do not file Form 8621, am I still taxed under the PFIC rules?

Yes. The exception removes a reporting obligation, not the substantive regime. The fund remains a section 1291 fund, your holding period keeps accruing through every year in which you file nothing, and when you eventually receive an excess distribution or sell at a gain the amount is allocated across the entire holding period, with the separate tax and interest charge under section 1291(c) applying to the portions allocated to earlier years. Years spent below the threshold do not reduce that later charge.

Does the de minimis exception affect my Form 8938 or FBAR filing?

No, and it can make Form 8938 more detailed rather than less. The two regimes have entirely separate tests: per the Instructions for Form 8938 a single filer abroad reports at more than $200,000 on the last day of the year or more than $300,000 at any time, and a joint filer abroad at more than $400,000 or $600,000, while the IRS comparison page puts the FBAR trigger at foreign financial accounts exceeding $10,000 in aggregate at any time. Form 8938 relief for duplicative reporting applies only to assets actually reported on a filed Form 8621 and counted in Part IV, so funds covered by the de minimis exception must be reported in full on Form 8938 instead.

Form 8621 Not Required: PFIC De Minimis Exception

PFIC reporting UK funds is normally described as an unavoidable annual ritual, but the Instructions for Form 8621 contain an exception that a surprising number of Americans in the UK qualify for. If the aggregate value of all your PFIC stock is $25,000 or less on the last day of your tax year, $50,000 or less on a joint return, and you received no excess distribution from and recognised no gain on the disposition of the fund in question, you are not required to complete Part I of Form 8621 for that fund. For a shareholder with nothing else to report, Part I is the only reason the form exists, so the practical result is no Form 8621 for that fund for that year.

That is useful for clients who arrived in London years ago with a tail of small legacy holdings nobody ever tidied up. The exception is also narrower than the one-line summaries suggest: measured on a single day, destroyed by events that look harmless, and capable of quietly increasing the detail you owe on Form 8938.

PFIC reporting UK funds: what the de minimis exception actually says

The exception sits in the Instructions for Form 8621, currently the December 2025 revision, under the heading Exceptions To Filing Part I. The IRS introduces that block with one line: a shareholder is exempt from completing Part I if it meets one of the exceptions described below. The one that matters here is headed Exception if aggregate value of shareholder's PFIC stock is $25,000 or less.

The wording repays a slow read. A shareholder is not required to complete Part I with respect to a specific section 1291 fund if the shareholder meets the $25,000 exception on the last day of the shareholder's tax year and the shareholder does not receive an excess distribution from, or recognize gain on the sale or disposition of the stock of, the section 1291 fund. The instructions cite Regulations section 1.1298-1(c)(2) as the authority.

Notice what the heading does not say. This is an exception to completing Part I, not a blanket exception to filing the form. Part I is the annual information summary that satisfies the reporting requirement under section 1298(f), so if it is the only part you would otherwise complete, dropping it makes the form disappear. Any other reason to file under Who Must File and the form survives. Everything below must hold before you rely on the exception for a given fund.

Aggregate value of all your PFIC stock is $25,000 or less on the last day of your tax year, or $50,000 or less on a joint return.
No excess distribution from that fund during the year.
No gain recognised on a sale or other disposition of that fund's stock during the year.
The fund is a section 1291 fund: per the instructions, a PFIC for which no QEF election and no mark-to-market election was made, or an unpedigreed QEF.
No other item in Who Must File applies to that fund, such as making an election reportable in Part II.

How is the aggregate value measured for the $25,000 test?

The measurement date is the last day of the shareholder's tax year, which for individuals means 31 December. It is a snapshot, not an average and not a high-water mark. A portfolio that touched $60,000 in July and closed at $23,000 meets the test; one that sat at $24,000 all year and closed at $25,400 does not.

What goes into that snapshot is spelled out. The shareholder takes into account all PFIC stock, meaning QEFs, section 1291 funds, and PFIC stock subject to a section 1296 mark-to-market election, owned directly or indirectly other than PFIC stock owned through another US person or through another PFIC. That is a wider net than most readers expect.

Counted: section 1291 funds held directly, such as a UK OEIC, authorised unit trust or investment trust bought on a UK platform.
Counted: PFIC stock for which a QEF election is in force.
Counted: PFIC stock subject to a section 1296 mark-to-market election.
Counted: PFIC stock owned indirectly, subject to the exclusions below.
Not counted: PFIC stock owned through another US person.
Not counted: PFIC stock owned through another PFIC, tested instead against the $5,000 figure.

The asymmetry is easy to miss. Elected stock counts when you measure the ceiling, but the relief reaches only section 1291 funds, so an elected holding pushes you towards the limit without ever benefiting from the exception. A single client with $18,000 of legacy OEICs and $9,000 of a mark-to-market position is at $27,000, over the line, and every legacy OEIC now needs a Part I.

What is the threshold if we file a joint return?

The instructions are explicit: shareholders filing a joint return have a combined threshold of $50,000 instead of $25,000 for purposes of this exception. Read combined literally. It is one $50,000 ceiling for the couple, covering the PFIC stock of both spouses together, not $25,000 each tested separately.

What is the $5,000 indirect ownership exception?

A second, narrower exception covers holdings inside another PFIC. A shareholder is not required to complete Part I with respect to indirect ownership of a specific section 1291 fund if the shareholder meets the $5,000 exception for that fund on the last day of the tax year and receives no excess distribution from, and recognises no gain on the sale or disposition of, that fund. For that test the shareholder takes into account only the value of their proportionate share of the fund.

This matters for fund-of-funds structures, common across UK multi-asset ranges, where one OEIC holding twenty underlying collective schemes generates a long list of lower-tier PFICs. The $5,000 figure is applied fund by fund against your proportionate share, and it is a different test from the $25,000 ceiling rather than a subset of it.

Why does an excess distribution or a disposal destroy the exception?

Because those conditions are cumulative with the value test, not alternatives to it: both the $25,000 and the $5,000 exceptions carry the same rider. The instructions define an excess distribution as the part of the distribution received from a section 1291 fund in the current tax year that is greater than 125 percent of the average distributions received in respect of such stock by the shareholder during the three preceding tax years. It is determined per share and allocated to each day in the holding period, with the portions allocated to prior years attracting the separate tax and interest charge under section 1291(c). A steady UK OEIC income distribution broadly in line with recent years will usually fall under that line. A recently acquired holding has little averaging history behind it, which mechanically raises the risk of a breach, so check the current instructions on how the early years of a holding period are treated.

The disposal condition is blunter. Any recognised gain on a sale or disposition of that fund's stock during the year takes it out of the exception, however far below the ceiling your portfolio sits. A GBP 900 partial redemption to meet a school fee, an in-specie switch between share classes, or a platform rebalancing trade can each be a disposition. This is the most common reason a client who believed they were exempt owes a form.

Do I still file if a QEF or mark-to-market election is in force?

Generally yes, for two independent reasons. Who Must File requires a US shareholder to file where they are reporting information with respect to a QEF or a section 1296 mark-to-market election, and the de minimis figure does not touch that trigger. Separately, the exception is drafted only with respect to a section 1291 fund, and a fund with a live election is not one.

The practical consequence is rarely spelled out. An election converts a small holding from something that might have been exempt in quiet years into something reportable every year for as long as it runs, through Part III for a QEF or Part IV for mark-to-market. That is often still right, because the elections change how income is taxed rather than merely how it is reported. It should nonetheless be a deliberate decision priced against the annual compliance cost, not a reflex applied across a set of GBP 4,000 legacy positions.

Is the exception all-or-nothing, or does it work fund by fund?

It works fund by fund, gated by a portfolio-level test. Most published guidance gets this wrong, and it changes the answer for anyone holding a spread of small positions. The IRS language is with respect to a specific section 1291 fund, so the analysis runs in two stages.

Stage one is the portfolio gate: add up all your PFIC stock on the last day of the year on the counting rules above. Over $25,000, or $50,000 jointly, and the exception is unavailable for everything. Stage two applies only once you have cleared the gate: for each fund individually, ask whether there was an excess distribution or a recognised disposition gain. A fund that fails needs a Form 8621; the others do not. One disposal does not drag the whole portfolio onto forms.

Not filing Form 8621 is not the same as not being taxed

This is the most expensive misunderstanding in the area. The de minimis exception is an exception to an information reporting requirement, not an exemption from the substantive PFIC regime. Section 1291 continues to apply to every one of those funds through every year in which you file nothing.

The holding period is the mechanism that makes this costly. Because an excess distribution or a disposition gain is allocated to each day in your holding period, the years in which you correctly filed nothing are still days in that period. When you finally sell, or when a payout eventually breaches the 125 percent line, the amount is spread back across the whole period including the silent years, and the section 1291(c) interest charge is computed on the amounts allocated to them. A decade of exempt years does not shorten the tail; the clock kept running with no annual form to remind anyone.

Does the exception switch off Form 8938 or the FBAR?

No. Both run on entirely separate tests with entirely separate figures. For a specified individual living outside the United States, the Instructions for Form 8938 set the thresholds at more than $200,000 on the last day of the tax year or more than $300,000 at any time for a single filer, and more than $400,000 or $600,000 respectively on a joint return. The IRS comparison page for Form 8938 and FBAR requirements puts the FBAR trigger at foreign financial accounts exceeding $10,000 in aggregate at any time in the calendar year, filed with FinCEN by 15 April with an automatic extension to 15 October, and lists foreign mutual funds as reportable for both.

There is a sting almost no guidance mentions. The Instructions for Form 8938 give relief from detailed reporting for assets reported on certain other forms, Form 8621 among them, but you must identify on Form 8938 the forms on which the asset is reported and how many were filed. That relief only exists where a Form 8621 was actually filed and counted in Part IV. The Form 8621 instructions match from the other side: its Excepted Specified Foreign Financial Assets Reported box is ticked only if the filer also files Form 8938 and includes that form in the Part IV line 4 total.

Follow that through. Rely on the de minimis exception and there is no Form 8621 to point to, so those UK funds cannot be excepted out of Form 8938 and must be reported in full in the detailed asset section instead. Claiming the exception moves work rather than removing it, and for a client well over the Form 8938 thresholds it means more line-by-line disclosure, not less.

Worked example: a London-based American with legacy OEIC holdings

What follows is an illustration with figures we have constructed, not a real client. Marcus Hale is a US citizen who has lived in London since 2019, works in banking and files a joint return with his US citizen spouse. The bulk of his wealth sits in US accounts; what concerns us is the tail of UK fund positions he picked up in his first years here.

At 31 December 2025 those positions are worth, in US dollars: a UK equity income OEIC at $14,200, a UK smaller companies unit trust at $9,600, a global bond OEIC at $8,300, a UK index tracker OEIC at $11,400 and a UK property OEIC at $4,900. The aggregate is $48,400, under the $50,000 joint ceiling, and he made no disposals. The equity income OEIC paid $520 against a $480 three-year average, so 125 percent of that average is $600 and the payout is not an excess distribution; the others are similar. No election is in force in the group.

Result for 2025: no Form 8621 at all. Five funds, five potential forms, none required. The FBAR is still due, because his UK accounts comfortably exceed $10,000, and Form 8938 is still due because the household is well over the $400,000 joint threshold for taxpayers abroad. All five positions appear in detail on that Form 8938, precisely because no Form 8621 was filed.

In 2026 Marcus sells the property OEIC outright for $5,300 and recognises a gain. Markets rise, and at 31 December 2026 the four remaining positions stand at $15,900, $10,800, $8,700 and $13,100, an aggregate of $48,500. He is still under the joint ceiling on the last day, so the portfolio gate holds. But the property OEIC failed the disposal condition, so it needs a Form 8621 with the Part V disposition reporting completed, and the gain is allocated across his holding period back to 2019, including 2025 when he filed nothing. The other four still qualify. He files one form, not five.

In 2027 nothing happens at all: no sales, no unusual payouts. But the four remaining positions close the year at $17,100, $11,900, $8,900 and $14,800, an aggregate of $52,700. Over the joint ceiling on the last day, so the exception is unavailable for every one of them and he files four Forms 8621, each a Part I summary with no tax consequence whatsoever. Three years, three answers, driven by a year-end snapshot and one rebalancing trade.

What this means for a wealthy UK-resident American in practice

For clients with substantial wealth the exception is rarely a strategy in itself, because portfolios of any size are over the ceiling on any measuring date. It earns its keep at the edges of a large balance sheet: the residual GBP 3,000 fund left after a consolidation, the odd holding on a platform nobody logs into. Those positions generate disproportionate compliance cost.

Value the whole PFIC group at 31 December each year in US dollars on a consistent convention, and keep the working papers. The exception stands or falls on that figure.
Count elected holdings towards the ceiling even though they cannot benefit from the relief, and test fund-of-funds exposures separately against the $5,000 figure.
Screen every fund for two events before concluding it is exempt: a distribution above 125 percent of the three-year average, and any recognised gain on a sale, switch or in-specie transfer.
Treat a QEF or mark-to-market election as a permanent annual filing commitment, and price that in before making it on a small position.
Track the holding period from acquisition for every fund, including years in which no form is filed, because that record drives the computation on realisation.
Expect the funds to appear in full detail on Form 8938 in any year with no Form 8621 behind them.
If the portfolio hovers either side of the ceiling, decide deliberately whether an orderly clean-up beats an unpredictable annual filing pattern.

The exception is real, it is in the current Instructions for Form 8621, and it is under-used by people who assume every UK fund means a form every year. It is also fragile in ways that only surface when the conditions are applied holding by holding. Our tax preparation and compliance practice handles this inside the annual return cycle for Americans in the UK: valuing the group at year end, testing each fund against both conditions, preparing the Forms 8621 genuinely required, and reporting the rest correctly on Form 8938 and the FBAR. The objective is exactly the forms the instructions require, with a record strong enough to support the position years later when a fund is finally sold.