
An American in Britain buys a perfectly sensible index fund from a British provider. It is cheap, diversified and exactly what a financial adviser would recommend to anybody else.
To the American tax system it is a passive foreign investment company, and that classification brings three possible regimes rather than one. Two of them are elections and one is what happens if you do nothing.
The QEF election is the best of the three and the hardest to get, because a QEF election depends on paperwork the fund has to produce and usually will not. Mark-to-market is the practical fallback where the holding qualifies.
In our practice most people discover all of this after buying, which narrows the options considerably. An election made in year one is a different animal from one made in year four.
So the question is which door actually opens, not which one looks best on paper.
What is a QEF election?
A QEF election taxes you each year on your share of the fund's own earnings, as the fund earns them. What the fund earns from trading reaches you as ordinary income, and what it makes on disposals reaches you as long-term gain.
That is close to how an American mutual fund already works. It is the regime that treats the holder fairly.
What happens if you elect nothing
The default rules apply, and Congress designed them to hurt. The instructions explain when a payment counts as an excess distribution: broadly, once it runs more than a quarter above what the three preceding years averaged.
Any gain on sale counts as an excess distribution in full, with no part of it reaching capital gain rates. The rules then spread that amount back across the years you held the fund.
Each earlier year's slice carries tax at the highest rate for that year plus an interest charge running from then to now. A long holding therefore costs more than a short one on identical economics.
So doing nothing is an active choice with a price. Our note on identifying a PFIC covers how to tell whether you are in this position at all.
Why the QEF election is usually unavailable
Because a QEF election depends on the fund. The shareholder needs a yearly statement from the manager setting out their slice of what the fund earned and what it made on disposals, or the raw figures to work that out.
A British fund has no reason to produce that. It is an American requirement serving American investors the fund did not set out to attract, and nothing obliges a UK manager to compute figures on American principles.
Some larger managers do provide the statement a QEF election needs, usually because enough American clients asked. It is always worth asking before assuming.
So this turns on fact rather than law. Either the statement exists or the election cannot work.
What the statement has to show
Two numbers, essentially: your slice of what the fund made from ordinary trading over its year, and your slice of what it cleared on disposals. The manager can hand you those directly or give you enough underlying detail to derive them, and an intermediary may supply the statement in the fund's place.
The regulation governing the election sets out how it is made and what keeps it alive. It is worth reading before relying on a statement somebody has offered informally.
Keeping the statements matters as much as getting them. Failure to produce them later can invalidate or terminate an election that was perfectly good when made.
That record-keeping runs for as long as the holding does, which may be decades.
So file each year's statement with that year's return copy. Reconstructing them from a fund's archives is rarely possible.
When does mark-to-market work instead?
Where the holding counts as marketable stock, which has a technical meaning rather than a commercial one. The holding has to change hands often enough, on a recognized American exchange or on a foreign one the rules accept, and the regulations reach a few further cases beyond that.
An exchange traded fund listed in London will often qualify. A unit trust bought directly from a manager generally will not, because nothing about it trades on an exchange.
So the structure of the holding decides this, not its size or its investment strategy.
Check the listing before assuming the election is available. Two funds with identical portfolios can fall on different sides of this line.
| Default rules | QEF election | Mark-to-market | |
|---|---|---|---|
| Needs anything from the fund | No | Yes, an annual statement | No |
| Needs an exchange listing | No | No | Yes, marketable stock |
| Gain on sale | Ordinary income in full | Capital gain keeps its character | Ordinary income |
| Tax before you sell | No | Yes, on the fund's earnings | Yes, on the rise in value |
| Interest charge at the end | Yes | No | No |
| Losses | General rules | General rules | Only against earlier inclusions |
How mark-to-market taxes you
On the movement in value each year, whether or not you sell a thing. An increase over the year goes into income as ordinary income.
A fall in value is deductible, but no further than the amounts you previously brought into income and have not yet reversed. In plain terms you can claim losses back against gains you previously paid tax on, and no further.
Anything beyond that falls under the general loss rules rather than this regime. The asymmetry is deliberate.
So it works best on a holding that rises steadily and sits in a taxable position anyway. It works badly on something volatile.
There is also no interest charge at the end, which is the whole point of choosing it. You pay as you go and the account is square each year.
An illustrative example
Take an American in Leeds holding a London-listed exchange traded fund that has doubled over eight years. Under the default rules the whole gain is ordinary income, spread back over eight years, with interest on each slice.
Under mark-to-market she would have paid ordinary income tax on each year's rise as it happened, with no interest charge at the end. More tax earlier, less pain later.
A QEF election would have served her better still, because the fund's own capital gains would have kept their character in her hands.
Notice that the comparison is not about avoiding tax. All three regimes tax the same economics differently, and two of them do it without a penalty on patience.
Making the election late
A QEF election normally belongs on the return for the first year it applies, filed by the due date. Missing that does not end the matter, but it complicates it considerably.
Retroactive elections remain possible in defined circumstances, including where a protective statement went in earlier or where the Service consents. Neither is automatic and both need care.
A fund sitting in the default regime before an election usually needs purging, which settles the old years rather than carrying them forward.
So a late election is a project rather than a box. Budget for it accordingly.
The cost of the delay is usually the interest that accrued meanwhile, which nothing removes. That figure grows quietly for every year the position sits unaddressed.
What the forms actually cost you
Form 8621 carries no monetary penalty for failing to file it, which surprises people used to the figures attached to other international forms. The form page sits alongside the instructions.
What an unfiled form does is keep the year open, because the limitation period does not start running properly on an incomplete return.
The real cost is therefore the tax under the default regime plus the interest, not a fine.
So the pressure here is economic rather than punitive. That changes how urgent the fix feels and should not.
Can you just avoid PFICs altogether?
Usually yes, and for most people that is the better answer than mastering any of this. Holding American-domiciled funds removes the classification entirely, and the investment outcome is generally indistinguishable.
The obstacle is access, because European rules restrict the sale of American funds to retail investors here. That is a distribution problem rather than a tax one.
Selling an existing holding to get there is its own decision, because the disposal happens under whichever regime currently applies. Clean up in the right order or the exit costs more than the problem did.
Workable routes exist, and our note on investing as a US person in the UK covers them.
So prevention beats election. The elections exist for holdings somebody already has.
Where pensions sit
Differently, and this is the relief most readers need. Funds inside a qualifying pension scheme generally fall outside the problem, which is why a workplace pension full of British funds creates no headache here.
That treatment depends on the scheme rather than on the funds inside it. The analysis belongs with the pension, not with the holdings.
Our note on a brokerage account covers the taxable side where it does bite.
So separate the wrappers before counting the funds. The same fund can be a problem in one place and not in another.
What to do in year one
Ask the manager for an annual information statement before you buy, not after. The answer decides which regime you are choosing.
If the answer is no, check whether the holding trades on a qualifying exchange. That is the second door.
If both are shut, buy something else. There is no third election waiting to be discovered.
So the work belongs at the purchase, where it takes ten minutes. Later it takes an accountant.
Write the answers down somewhere you will find them again. The next purchase raises the same three questions, and the manager's answer rarely changes between one year and the next.
Common mistakes we see
The first is assuming a QEF election is available because it would be sensible. Both elections have factual preconditions and neither bends.
The second is making a mark-to-market election on something that is not marketable stock. The election simply does not take, and the default rules carry on quietly.
The third is discarding the annual statements. An election can fail years later for want of paper that once existed.
A fourth is selling in a panic. A disposal under the default rules is the worst possible moment to realize the position.
How we help with PFIC holdings
We start by establishing which holdings are actually caught, because people routinely over-count and occasionally miss one. That list drives everything after it.
Then we test each holding against both elections on the facts, rather than assuming the better one applies.
Our US federal returns work covers the computations and the forms, and you can get in touch before a disposal rather than after one.
So the order is identify, test, then elect. Reversing it wastes the only year that was easy.
- List every non-US fund, including ones held through a platform.
- Separate the pension holdings from the taxable ones.
- Ask each manager in writing whether an annual information statement exists.
- Check each remaining holding for a qualifying exchange listing.
- Choose the regime for each fund, holding by holding.
- File Form 8621 for every caught holding, with the election where one applies.
- Keep each year's statement with that year's return, for as long as you hold the fund.




