Yes. WSML (iShares MSCI World Small Cap UCITS ETF (Accumulating)) is domiciled in Ireland, so it is a non-US pooled investment fund — which the IRS treats as a Passive Foreign Investment Company (PFIC) for US citizens and green-card holders. Nearly all UCITS ETFs are PFICs for this reason, regardless of what they hold.

Do I have to file Form 8621 for WSML?

If you are a US person who held WSML during the year, you generally file one Form 8621 for it. Each PFIC you hold needs its own Form 8621, and you choose a treatment for each — QEF, mark-to-market (§1296), or the default §1291 excess-distribution rules.

Why is WSML a PFIC when it tracks ordinary stocks?

PFIC status comes from the fund's structure and domicile, not what it holds. WSML is a Ireland-domiciled fund, so even when it tracks global developed-market small-cap equities, it is a foreign fund to the IRS and falls under the PFIC rules.

What does the default §1291 treatment cost?

Under §1291 (no election), gains and "excess distributions" are taxed at the highest ordinary rate for the year they're allocated to, plus an interest charge back to the years you held the fund — often far more than a normal capital-gains rate. Electing QEF or mark-to-market early usually avoids that. Use the §1291 estimator to model your own numbers.

WSML · Ireland domicile

Is WSML a PFIC? Yes — for US citizens, it is.

WSML (iShares MSCI World Small Cap UCITS ETF (Accumulating)) is domiciled in Ireland. To the IRS, any non-US pooled fund is a Passive Foreign Investment Company (PFIC) for US persons — so even though it tracks global developed-market small-cap equities, holding it triggers Form 8621.

Run the free PFIC scan Estimate the §1291 cost

No card · free draft · a CPA typically charges $1,200–$3,000+ for Form 8621 work; Atamatax is a flat $499.

What being a PFIC means for your WSML holding

One Form 8621

You file a Form 8621 for WSML (and one for every other PFIC you hold). Atamatax generates the official pre-filled form.

You pick the election

QEF, mark-to-market (§1296), or the default §1291 — surfaced per holding for you to confirm, never auto-decided.

§1291 is punitive

With no election, gains are taxed at the top rate plus an interest charge back to purchase. Electing early usually avoids it.

Frequently asked

Is WSML a PFIC?: Yes. WSML (iShares MSCI World Small Cap UCITS ETF (Accumulating)) is domiciled in Ireland, so it is a non-US pooled investment fund — which the IRS treats as a Passive Foreign Investment Company (PFIC) for US citizens and green-card holders. Nearly all UCITS ETFs are PFICs for this reason, regardless of what they hold.
Do I have to file Form 8621 for WSML?: If you are a US person who held WSML during the year, you generally file one Form 8621 for it. Each PFIC you hold needs its own Form 8621, and you choose a treatment for each — QEF, mark-to-market (§1296), or the default §1291 excess-distribution rules.
Why is WSML a PFIC when it tracks ordinary stocks?: PFIC status comes from the fund's structure and domicile, not what it holds. WSML is a Ireland-domiciled fund, so even when it tracks global developed-market small-cap equities, it is a foreign fund to the IRS and falls under the PFIC rules.
What does the default §1291 treatment cost?: Under §1291 (no election), gains and "excess distributions" are taxed at the highest ordinary rate for the year they're allocated to, plus an interest charge back to the years you held the fund — often far more than a normal capital-gains rate. Electing QEF or mark-to-market early usually avoids that. Use the §1291 estimator to model your own numbers.

This is a computed classification based on the fund's domicile, not individualized tax, legal, or investment advice — see our methodology (IRC §1297 et seq.). Confirm your specific situation with a licensed professional.

Hold more than one? Check each.

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