If you've read our earlier piece on PFIC rules for Indian mutual funds, you already know the label — Passive Foreign Investment Company — gets applied to virtually every Indian mutual fund scheme once a US person holds it. What that article didn't get into is what filing actually looks like once you're past the "yes, this applies to me" stage. Form 8621 is the vehicle for it, and its mechanics are unusually unforgiving compared to most US information returns.
One form per fund, every year you're on the hook
The IRS requires a separate Form 8621 for each PFIC you hold, directly or indirectly — not one form summarizing your whole portfolio. Hold four different Indian mutual fund schemes and you're generally looking at four separate forms, each attached to your regular return. There is a de minimis exception commonly cited at $25,000 in total PFIC value ($50,000 married filing jointly, dropping to $5,000 for indirectly-held PFICs) below which you may not need to file at all — but that exception evaporates the moment you receive an "excess distribution," recognize gain on a sale, or have a QEF or mark-to-market election in place. In practice, a lot of NRIs who think they're under the threshold aren't, once redemptions or partial withdrawals happen — confirm your specific numbers against current instructions with a preparer.
The default: the excess-distribution regime
Absent an election, gains and "excess distributions" (broadly, distributions well above a fund's recent average) aren't just taxed in the year you receive them. The amount is allocated ratably across your entire holding period: the portion attributed to the current year is taxed as ordinary income, and the portion attributed to each earlier year is taxed at the highest marginal rate that applied in that year, plus an interest charge running from that year's original filing deadline up to your current return. The commonly cited effect is that a long-held fund sold at a gain can generate a tax-plus-interest bill meaningfully larger than a simple capital-gains calculation would suggest — this is genuinely one of the more punitive corners of the US international tax code, and the exact arithmetic is complex enough to run past a preparer rather than estimate from a rule of thumb.
QEF and mark-to-market: available on paper, mostly unavailable in practice
Two elections exist to escape the default regime. A Qualified Electing Fund (QEF) election lets you be taxed annually on your share of the fund's earnings instead — but it requires the fund itself to issue a "PFIC Annual Information Statement" computed under US tax principles. Indian asset management companies, as best current guidance suggests, do not produce this statement for any major fund house — names repeatedly cited include HDFC, SBI, ICICI Prudential, Axis, Kotak, and Mirae. Without that statement, the QEF election generally isn't available to you, whatever your intentions. Mark-to-market is a second option, but it's restricted to "marketable stock" regularly traded on a qualifying exchange, and Indian mutual fund units typically don't meet that definition — though some Indian-listed ETFs might be a different case, worth confirming individually rather than assuming either way.
The compliance burden, honestly stated
Between per-fund filing, multi-year rate lookups, interest computation, and the fact that preparers who handle this well charge accordingly, Form 8621 compliance is genuinely one of the more expensive recurring costs of holding Indian mutual funds as a US person. None of this is a reason to panic-sell existing holdings without advice — dispositions have their own tax consequences — but it is a reason to treat "I'll deal with PFIC reporting later" as a more expensive deferral than it looks.