Is the Form 8621 mark-to-market election better than a QEF election for a UK fund?

On raw tax outcome the QEF election is often better, because it preserves capital gain character on the fund's net capital gains, while every mark-to-market inclusion is ordinary income. In practice the comparison rarely arises for UK holdings, because a QEF election must be supported by a PFIC Annual Information Statement computed under US federal tax principles, and UK retail fund managers do not produce one. Where no statement is available, section 1296 is not the second-best choice; it is the only elective choice, and the real comparison is against the default regime rather than against the QEF.

Does my UK fund count as marketable stock for section 1296 purposes?

It depends on the specific line held rather than on the fund's reputation or size. Treasury Regulation section 1.1296-2 treats stock as marketable if it is regularly traded on a qualified exchange, meaning traded other than in de minimis quantities on at least 15 days during each calendar quarter, on an exchange that is regulated or supervised by a governmental authority and meets the disclosure, surveillance and active trading requirements the regulation sets. Where a foreign exchange operates more than one tier, each tier is treated as a separate exchange, so a Main Market conclusion does not carry across to AIM.

Can I make the election on a UK fund that is not listed on any exchange?

Possibly. Section 1296(e)(1)(B) extends marketable stock to a foreign corporation comparable to a regulated investment company that offers for sale or has outstanding stock redeemable at its net asset value, which describes a UK open-ended fund dealt at NAV. Treasury Regulation section 1.1296-2(d)(1) then imposes eight conditions tested against the share class actually held, including more than one hundred unrelated shareholders, no minimum initial investment above USD 10,000, at least weekly published quotations in a medium not controlled by the issuer, published audited financial statements, regulation as an investment company, no senior securities, and both 90 percent passive income and 90 percent passive asset thresholds. The analysis is fund-specific and must be evidenced, but it is not automatically closed.

Does UK reporting fund status let me make a QEF election?

No. UK reporting fund status is an HMRC approval under section 355(1) TIOPA 2010 that requires the fund to report income to investors and to HMRC and, in return, allows a UK investor capital gains treatment on disposal rather than an offshore income gain. The reported income figure is computed under UK rules for UK purposes. It is not a statement of ordinary earnings and net capital gains under US federal tax principles and cannot support a QEF election. A fund can hold UK reporting fund status and remain a PFIC for which only the section 1296 route is available.

What happens if I make the election after holding the fund for several years?

The first year of the election becomes a coordination year. Under section 1296(j) and Treasury Regulation section 1.1296-1, the excess of fair market value on the last day of that year over adjusted basis is treated as gain recognised on a disposition and taxed under the section 1291 regime, basis is increased by that amount, distributions received in that year also fall under section 1291, and no loss can be recognised. From the following year the ordinary annual mechanics apply. The election is prospective; late elections are permitted only in accordance with section 301.9100, which is discretionary relief rather than a routine filing step.

What happens to a decline in value I could not deduct because of the cap?

It is not lost, but it is deferred and its character may change. The deduction in any year is limited to unreversed inclusions, defined in section 1296(d) as prior inclusions less prior deductions under the election. Any decline beyond that cap simply remains reflected in adjusted basis and is only recognised on disposal. At that point, loss is ordinary only to the extent of any remaining unreversed inclusions and is capital beyond it, so a shareholder whose unreversed inclusions have been exhausted can find a deferred decline emerging as a capital loss subject to capital loss limitations.

Form 8621 Mark-to-Market Election for UK Funds

The Form 8621 mark-to-market election is an election under section 1296 of the Internal Revenue Code that allows a US shareholder of a passive foreign investment company to treat that holding as if it were sold at fair market value on the last day of each tax year, recognising the annual change in value as ordinary income instead of accepting the deferred charge regime that otherwise applies. For a US citizen or green card holder living and investing in the United Kingdom, it matters more than any other PFIC election, for one blunt reason: it is frequently the only election actually available. The qualified electing fund route depends on the fund handing the investor a PFIC Annual Information Statement, and UK fund managers almost never produce one. This article sets out what section 1296 requires, which UK holdings pass the marketable stock gate, how the annual computation runs in practice, and what happens when the election is finally made years late on a missed reporting investment account.

What Is the Form 8621 Mark-to-Market Election?

Section 1296 permits a US person who owns marketable stock in a passive foreign investment company at the close of the tax year to include in gross income the excess, if any, of the fair market value of that stock at year end over its adjusted basis. Where the position has fallen instead, the shareholder is allowed a deduction equal to the lesser of that decline or the unreversed inclusions attributable to the stock. The Internal Revenue Service describes the resulting inclusion in the Instructions for Form 8621 as an amount treated as ordinary income. There is no interest charge, no allocation of gain back across the holding period, and no dependence on any cooperation from the fund manager. That last point is the whole reason the election exists in a UK practice.

Mechanically, the election is made by filing Form 8621 with the US income tax return and checking box C in Part II. The IRS instructions state that the election must be made on or before the due date, including extensions, of the return for the tax year in which the stock is marked to market. Where the shareholder held the stock in earlier years without an election in force, the first year of the election is a coordination year and is reported in Part V rather than Part IV. Once made, the election continues for every subsequent year, and a separate Form 8621 is required for each PFIC held. Note that the election is made per PFIC, not per portfolio, so a UK investor holding fifteen funds is making fifteen separate decisions and filing fifteen separate forms every year.

Which UK Holdings Meet the Marketable Stock Requirement?

This is the crux of the analysis, because marketable stock is the gate. If the holding is not marketable stock, the election is simply unavailable and the shareholder is left with the default regime. Treasury Regulation section 1.1296-2 defines marketable stock in three parts: PFIC stock that is regularly traded on a qualified exchange or other market, stock in certain PFICs described in paragraph (d) of that regulation, and options on such stock. Most commentary stops at the first limb, which is why so many UK investors are told the election is closed to them when it may not be.

For the first limb, the regulation sets a specific frequency test. A class of stock is regularly traded for a calendar year if it is traded, other than in de minimis quantities, on at least 15 days during each calendar quarter. That is a quarter-by-quarter test, not an annual average, so a thinly traded specialist fund can pass three quarters and fail the fourth. The regulation also contains an anti-abuse rule that disregards trades entered into or carried out principally to meet the trading requirement. A qualified exchange or other market means a national securities exchange registered with the Securities and Exchange Commission or the national market system established under section 11A of the Securities Exchange Act of 1934, or a foreign securities exchange that is regulated or supervised by a governmental authority of the country in which the market is located and that has the characteristics the regulation specifies.

Those characteristics are the reason the London Stock Exchange is comfortable territory. The regulation requires trading volume, listing, financial disclosure, surveillance and other requirements designed to prevent fraudulent and manipulative acts and practices and to protect investors, requires that the laws of the country and the rules of the exchange ensure those requirements are actually enforced, and requires that the rules of the exchange effectively promote active trading of listed stocks. A further provision is routinely missed: where an exchange in a foreign country has more than one tier or market level on which stock may be separately listed or traded, each tier is treated as a separate exchange. A Main Market listing and an AIM listing are therefore tested separately, and a conclusion about one says nothing about the other.

Identify the precise line the client actually holds, including the listing venue, the currency line and the share class, because the tests are applied to a class of stock rather than to the fund as a whole.
Establish the exchange and, where the exchange operates tiers, which tier the line sits on.
Evidence trading on at least 15 days in every calendar quarter of the year in question, other than in de minimis quantities, and retain that evidence with the working papers.
Confirm that the position is genuinely held directly rather than through a platform nominee arrangement that changes what the shareholder is treated as owning.
Repeat the assessment each year, because the election terminates automatically if the stock ceases to be marketable.

Can a UK Fund That Is Not Exchange-Traded Still Qualify?

It can, and this is the point most PFIC content gets wrong. Section 1296(e)(1)(B) extends marketable stock to stock in any foreign corporation which is comparable to a regulated investment company and which offers for sale or has outstanding any stock of which it is the issuer and which is redeemable at its net asset value. That is a precise description of a UK open-ended investment company or authorised unit trust dealt daily at net asset value on a platform. The statutory door exists. What closes it, in most but not all cases, is the list of conditions in Treasury Regulation section 1.1296-2(d)(1), which must be satisfied with respect to the class of shares held by the electing taxpayer.

At all times during the calendar year the foreign corporation has more than one hundred shareholders in that class, excluding shareholders related under section 267(b).
At all times during the calendar year the class is readily available for purchase by the general public at net asset value, and the corporation does not require a minimum initial investment greater than USD 10,000.
Quotations for the class are determined and published no less frequently than weekly in a widely available permanent medium not controlled by the issuer, such as a newspaper of general circulation or a trade publication.
No less frequently than annually, independent auditors prepare financial statements including balance sheets and statements of income and expenses, and those statements are made available to the public.
The corporation is supervised or regulated as an investment company by a foreign government or agency with broad inspection and enforcement authority and effective oversight over investment companies.
At all times during the calendar year the corporation has no senior securities authorised or outstanding, including any debt other than in de minimis amounts.
Ninety percent or more of the gross income of the corporation for its taxable year is passive income as defined in section 1297(a)(1).
The average percentage of assets held during the taxable year that produce, or are held for the production of, passive income is at least 90 percent.

Read against a mainstream UK equity fund, several of those conditions are unremarkable. An authorised fund is supervised by the Financial Conduct Authority, publishes audited annual financial statements, typically carries no senior securities, and on an equity or bond mandate will comfortably meet both 90 percent passive tests. The conditions that decide the outcome are usually the fourth and the second: whether the class prices are published weekly in a permanent medium outside the issuer's control, and whether the minimum initial investment for that class exceeds USD 10,000. The second of these produces a result that surprises clients. Because the test is applied to the class held, an institutional or clean share class carrying a six-figure minimum can fail while the retail class of the identical fund, with the identical portfolio and the identical manager, passes. Share class selection, usually treated as a pricing question, quietly determines whether a US election is available at all. A separate anti-abuse rule disapplies this route for any calendar year in which the corporation takes action with a principal purpose of manipulating the net asset value of the class.

None of this makes the second door easy. It makes it a question to be answered on the evidence, fund by fund and class by class, and documented, rather than a question to be waved away.

Why Is the QEF Election Usually Unavailable for UK Funds?

The qualified electing fund election under section 1295 is often presented as the superior option, and on pure tax outcome it frequently is, because it preserves capital gain character on the fund's net capital gains. It is also, for the great majority of UK holdings, theoretical. A QEF election requires the shareholder to include a pro rata share of the fund's ordinary earnings and net capital gains computed under US federal tax principles, and to substantiate those figures with a PFIC Annual Information Statement from the fund. UK managers have no legal obligation to produce one and, in the retail market, do not. The obstacle is accounting architecture rather than reluctance: a UK authorised fund keeps its books to UK accounting and UK tax rules, and restating earnings and profits under US principles for a handful of US-connected holders is a bespoke exercise nobody has contracted to perform. Without that statement the election cannot properly be supported, and section 1296 becomes the practical alternative rather than the consolation prize.

Does UK Reporting Fund Status Satisfy the IRS?

No, and conflating the two regimes is one of the most persistent errors in this area. UK reporting fund status is a domestic UK concept. HMRC guidance describes a reporting fund as an offshore fund approved under section 355(1) of the Taxation (International and Other Provisions) Act 2010, which retains that status unless it is withdrawn or the fund is excluded, and HMRC publishes a monthly list of approved offshore reporting funds on GOV.UK. A reporting fund reports distributions and excess reportable income to its investors, who are taxed on their share of reported income whether or not it is distributed. In exchange, HMRC guidance confirms that on a subsequent disposal the investor is subject to tax on any capital gain or loss arising, rather than suffering an offshore income gain taxed at income rates. The regime exists, in HMRC's own framing, to prevent the roll-up of income in offshore funds with the subsequent realisation being returned to the investor in the form of capital.

Every element of that is a UK computation. The reported income figure is calculated under UK rules for UK purposes and reported to HMRC and to investors; it is not a statement of the fund's ordinary earnings and net capital gains under US federal tax principles, and it therefore cannot substitute for a PFIC Annual Information Statement. A fund can be a UK reporting fund and remain, to the IRS, an ordinary PFIC in respect of which no QEF election is supportable.

There is a deeper mismatch underneath. The two regimes classify investments along different axes. HMRC asks whether a fund is offshore relative to the United Kingdom. The IRS asks whether the issuer is foreign relative to the United States. A UK-domiciled OEIC is not an offshore fund for HMRC purposes at all, so it can never hold reporting fund status, yet it is unambiguously a foreign corporation for US purposes and almost invariably a PFIC. A Dublin-domiciled exchange-traded fund with a London listing sits in the opposite position: it needs reporting fund status for its UK holders and it is equally a PFIC. Reporting fund status is therefore neither necessary nor sufficient for any US election, and its presence or absence should never be used as a proxy for the US analysis.

How Does the Annual Mark-to-Market Computation Work?

In a settled year the computation is genuinely simple, which is much of its appeal. Compare the year-end fair market value with the adjusted basis. If value exceeds basis, the excess is included in gross income and treated as ordinary income. If basis exceeds value, a deduction is allowed for the lesser of that excess or the unreversed inclusions, which section 1296(d) defines as the amount previously included in income under the election over the amount previously allowed as a deduction under it. Basis is then increased by any inclusion and decreased by any deduction, so the position resets each year and gains are never taxed twice.

Two consequences follow that clients should understand before electing. First, character. Inclusions are ordinary income, and on an eventual sale any gain is likewise ordinary; a loss on sale is ordinary only to the extent of remaining unreversed inclusions, and is capital beyond that point. Preferential long-term capital gain rates are surrendered permanently in respect of that holding. Second, the deduction cap is asymmetric. In a year of decline the shareholder may be unable to deduct the full fall in value simply because there are insufficient prior inclusions to reverse, and the unrelieved amount remains locked inside basis until disposal. A third practical point rarely mentioned: the mark is computed in US dollars. Where a sterling-denominated holding is flat in sterling terms but sterling has strengthened, the election produces taxable ordinary income out of a currency movement the client never experienced as a gain.

A Worked Scenario: A London Investment Trust Held Since 2019

Consider a US citizen working in London who acquired shares in a London-listed investment trust in 2019 for the dollar equivalent of USD 200,000. An investment trust of this kind is a listed closed-ended company, not a settlement, and its shares trade on the Main Market. No Form 8621 was ever filed. The holding is identified during a compliance review and a section 1296 election is made for 2022, the earliest year in the catch-up filings. All figures below are illustrative.

At 31 December 2022 the shares are worth USD 260,000. Because 2022 is a coordination year rather than the first year of ownership, the USD 60,000 excess of value over basis is not simply ordinary income. It is treated as gain from a disposition on the last day of the year and thrown into the section 1291 regime, with the allocation and charge that regime imposes. Basis then steps up to USD 260,000. No loss would have been recognisable in that year had the shares fallen instead. From 2023 the ordinary mechanics take over. At 31 December 2023 the value is USD 290,000, producing an ordinary inclusion of USD 30,000, basis of USD 290,000 and unreversed inclusions of USD 30,000. At 31 December 2024 the value has fallen to USD 265,000; the decline is USD 25,000, which is less than the USD 30,000 of unreversed inclusions, so the full USD 25,000 is deductible as an ordinary loss, basis falls to USD 265,000 and unreversed inclusions reduce to USD 5,000. At 31 December 2025 the value falls again to USD 255,000. The decline is USD 10,000 but unreversed inclusions are only USD 5,000, so the deduction is capped at USD 5,000, basis falls to USD 260,000 and unreversed inclusions reach nil. The shareholder is now carrying basis of USD 260,000 against a market value of USD 255,000, and that unrelieved USD 5,000 stays trapped until the shares are sold, at which point it emerges as a capital loss rather than an ordinary one because there are no unreversed inclusions left to support ordinary treatment. Note also that the mark tracked the quoted share price throughout. Investment trust shares trade at a discount or premium to net asset value, so a widening discount alone can generate a deduction, and a narrowing discount alone can generate taxable income, independently of how the underlying portfolio performed.

What Happens When You Elect Years Late?

This is the position most people reading about section 1296 are actually in. The election is prospective by design and does not rewrite history. Treasury Regulation section 1.1296-1 provides that the election is made on Form 8621 on or before the due date of the return including extensions, and that late elections are permitted only in accordance with section 301.9100, a relief route that is discretionary, evidence-heavy and not a routine filing step. The workable approach in a catch-up is usually to make a valid, timely election for the earliest open year being filed rather than to pursue relief for years already closed out.

The price of entering late is the coordination year. Where the shareholder held the stock in prior years with no election in force, the regulation and section 1296(j) require that section 1291 be applied to the excess of fair market value on the last day of that first year over adjusted basis, as if that amount were gain recognised on a disposition on that day, with basis increased accordingly. Distributions received during that year fall under section 1291 as well. No loss may be recognised in the coordination year. The economic effect is a one-off settling of all the appreciation that accrued while the holding sat outside any election, taxed under the regime the election was intended to escape, after which the position is clean. Whether that is worth doing depends on how much built-in gain there is, how long the position has been held and how long it will be held going forward, and it is a modelling exercise rather than a rule of thumb.

Investment Trusts, ETFs, Open-Ended Funds and ISA Platforms

London-listed investment trusts. Listed closed-ended companies, ordinarily UK resident, outside the HMRC offshore funds regime entirely but foreign corporations to the IRS and typically PFICs. Because they are exchange traded, they are the cleanest candidates for the regularly traded limb, subject to evidencing the 15-day quarterly test on the specific tier and line held.
Exchange-traded funds with a London listing. Frequently Irish or Luxembourg domiciled, so they need UK reporting fund status for their UK holders while also being PFICs. Listing and liquidity usually make the regularly traded limb straightforward, but multiple currency lines and multiple listing venues mean the analysis must be run on the exact line held.
Open-ended investment companies and authorised unit trusts. Not exchange traded, so the first limb is unavailable and everything turns on the eight conditions of the NAV-redeemable route, tested on the specific share class. This is where careful analysis most often changes the answer.
Holdings inside an ISA. The wrapper is invisible to the IRS and confers no protection; what matters is the underlying holdings, which on most platforms are open-ended funds rather than listed vehicles. The wrapper does not alter the marketable stock analysis in either direction.
Individual shares in operating companies. Not PFICs merely because they are foreign, so section 1296 does not arise. The question only ever begins once the passive income or passive asset test is met.

When the Election Ends, and What It Costs You

The election is durable but not permanent. Treasury Regulation section 1.1296-1 provides that it terminates automatically if the stock ceases to be marketable, which is a live risk for a fund that is delisted, merged into a non-listed vehicle, or whose share class stops meeting the conditions relied on. Voluntary revocation requires the consent of the Commissioner, granted where there is a substantial change in circumstances, and is not something to plan around. There is also an ongoing administrative cost: the election must be reported annually on Form 8621 for each PFIC, and while a limited exception excuses some shareholders with small aggregate PFIC holdings from annual reporting, it is of no use once an election is in place, because the election itself is a filing trigger. The compliance burden of the election is the same in a flat year as in an active one.

Against that, the election delivers three things the default regime does not: no deferred charge accruing across the holding period, no dependence on a fund manager producing US-standard figures, and a computation that can be prepared from year-end statements the client already receives. For a UK-resident US taxpayer with a portfolio of listed funds, that combination is usually decisive.

Getting a Missed Reporting Investment Account Back on Track

A missed reporting investment account is rarely a single fund. It is typically a platform account holding a dozen or more positions accumulated over years, some listed and some not, some inside an ISA and some outside, with switches between share classes that the client never regarded as disposals. Preparing that account correctly means establishing PFIC status for each line, testing marketable stock separately for each, deciding which positions justify the coordination year cost and which are better disposed of, and then building a filing position that holds together across every open year. Our US and UK tax return preparation and compliance work covers exactly that exercise, including the catch-up filings and the annual Forms 8621 that follow once elections are in place.