Ask an international US tax adviser which rule causes the most pain per dollar invested, and many will give the same four letters: PFIC. The passive foreign investment company regime was written in 1986 to stop Americans deferring tax through offshore funds. What it actually does, in practice, is ambush ordinary expats who walked into a local bank and bought a perfectly sensible index fund.

What counts as a PFIC

A foreign corporation is a PFIC if 75% or more of its income is passive, or 50% or more of its assets produce passive income. That technical definition catches almost every non-US pooled investment:

  • Canadian mutual funds and ETFs;
  • Hong Kong, Japanese, Taiwanese and Singaporean unit trusts and funds;
  • UCITS funds sold across Asia and Europe;
  • Money-market funds at foreign banks;
  • Many investment-linked insurance policies and savings products popular in Hong Kong and Singapore;
  • Funds held inside TFSAs, RESPs, and other local wrappers.

The fund’s local tax-favoured status is irrelevant. If it is a pooled investment organised outside the US, assume PFIC until proven otherwise.

Why the default treatment hurts

Under the default rules (section 1291), you are not taxed as the fund grows — instead, the reckoning comes when you sell or receive a large (“excess”) distribution, and it is engineered to sting:

  • The gain is thrown back evenly over your holding period;
  • Each year’s slice is taxed at that year’s highest ordinary rate — capital gains treatment does not exist here, whatever your actual bracket was;
  • An interest charge is added to each year’s notional tax, compounding from that year to now.

Hold a foreign fund for fifteen years and the combined tax-plus-interest on sale can consume a large share of the entire gain — sometimes effectively all of it. There is no other asset class an American can buy where simply holding patiently makes the tax worse.

On top of the tax: Form 8621, generally required for each PFIC, each year. The forms are intricate, few preparers handle them well, and an unfiled 8621 can hold the statute of limitations on your whole return open indefinitely.

The elections that defuse it

Two elections can convert a PFIC into something civilised — both with catches:

  • QEF election (Qualified Electing Fund): you pay US tax annually on your share of the fund’s earnings, preserving capital-gains character for gains. The catch: the fund must supply a US-specific annual information statement, which mass-market Asian and Canadian funds almost never do.
  • Mark-to-market election: available for regularly traded funds; you pay tax each year on the fund’s appreciation as ordinary income. No fund cooperation needed. The catch: tax on paper gains every year, at ordinary rates, with limited loss relief.

Both elections work properly only when made for the first year of ownership; electing later requires a cleansing “purge” that triggers the very throwback tax you were trying to avoid. Timing is everything.

What expats should actually do

  1. Audit what you own. Every non-US fund, wrapper, and insurance product — including inside TFSAs, RESPs, MPF-adjacent voluntary schemes and bank “investment plans”. Identification is most of the battle.
  2. Stop the inflow. Direct new investing toward US-listed ETFs and funds (or direct shareholdings, which are not PFICs even when foreign). For most expats this single habit ends the problem prospectively. (Watch the mirror-image issue: some countries tax US funds unfavourably — Canadians know this dance from the other side.)
  3. Triage what exists. Small positions are often best simply sold — the throwback on a modest gain is an annoyance, not a catastrophe, and it caps the damage. Large or old positions deserve modelling: sell, elect, or hold depends on numbers, not slogans.
  4. Beware “wealth products”. Across Asia especially, insurance-wrapped investment products are sold hard to expats. For a US person, most are PFIC problems with a sales commission attached. Have anything of the kind reviewed before signing.
  5. File the 8621s. Where PFICs exist, report them properly. Silent PFICs in a portfolio are a compliance problem that compounds — literally — every year.

The honest summary

The PFIC regime is harsh, but it is also almost entirely avoidable with foresight: invest through US-listed vehicles, screen products before buying, and deal with legacy holdings deliberately. The expensive cases are nearly always the unexamined ones. If your portfolio has never had a PFIC review, that review is among the highest-value hours you can buy from a cross-border adviser.