Is SXR8 a PFIC? Generally yes — verify the fund facts.

This is the part that catches people out. SXR8 tracks the S&P 500: Apple, Microsoft, the same 500 US corporations a US-domiciled tracker holds. Every underlying share is American. And yet SXR8 itself is an Ireland-domiciled fund, so as far as the PFIC rules are concerned you own a foreign investment company that happens to hold US stock.

A US-organized S&P 500 ETF is not a foreign corporation and therefore cannot be a PFIC. The conventional UCITS wrapper, its foreign corporate form and its passive investment profile are why many US expats end up analyzing Form 8621 for portfolios that otherwise look ordinary. If you hold the other line instead — CSPX (LSE) — the entity-classification analysis is unchanged: it is the same legal instrument under another listing.

SXR8 pays you nothing. The dividends from the underlying shares are reinvested inside the fund instead of hitting your account. Under the default §1291 rules, there may be no cash distribution to test as an excess distribution while you simply hold, while a later disposition can still trigger the allocation and interest-charge regime. Separate annual Form 8621 reporting can also apply during the holding period.

The whole bill then arrives at once. When you sell, the entire gain is allocated rateably across every day you owned SXR8; each prior year's slice is taxed at that year's highest ordinary rate, and an interest charge runs from each of those years through to the filing date. An accumulating share class is where §1291 does the most damage, because the longer you held quietly, the longer the interest has been running.

Two knock-ons worth planning around. A mark-to-market election under §1296 taxes the annual paper gain as ordinary income — but SXR8 distributes no cash, so you have to fund that tax from somewhere else every year. And a QEF election under §1295 requires a PFIC Annual Information Statement from the fund; if iShares does not produce one for this share class, QEF is not actually available to you no matter how much better it looks on paper.

A word on which line this is. SXR8 is the Xetra listing, quoted in euros; CSPX are the same ISIN (IE00B5BMR087) traded elsewhere. Nothing about that changes the PFIC answer, but it does change the arithmetic: every figure on Form 8621 is reported in US dollars, so a euro line has to be translated at each relevant date — including the purchase date, which §1291 pulls back into the calculation.

The QEF route for SXR8 depends on BlackRock/iShares issuing a PFIC Annual Information Statement covering the year — the ordinary-income-and-capital-gain breakdown §1295 requires. Ask for it in writing before you file rather than after: a QEF election made without the statement to support it is not one you want to be defending later.

SXR8 is the iShares Core S&P 500 UCITS ETF (Xetra), ISIN IE00B5BMR087. Match the ticker — and the ISIN, where your statement shows one — to this line before reading the mechanics above as yours.

CSPX is the same security as SXR8 under another ticker — the same ISIN, IE00B5BMR087. Whichever line your broker shows, SXR8 and CSPX are one holding for Form 8621: one fund, one holding period, one election history.

Three other S&P 500 funds in this registry raise the same question as SXR8: VUSA, VUAA and VUAG. SXR8 follows an S&P index, as VUSA, VUAA and VUAG do. The §1297 analysis does not change from one issuer to the next, and each fund is its own PFIC — its own Form 8621, holding period and election history. What does change is the share class, and whether the issuer publishes a PFIC Annual Information Statement for it.