Most Americans in Canada assume that owning a diversified mutual fund is a sensible, unremarkable decision. Under US tax law it is one of the most expensive mistakes a cross-border investor can make. The culprit is the Passive Foreign Investment Company (PFIC) regime, a set of rules designed to punish deferral through offshore funds. Applied to an ordinary Canadian fund held by a US citizen, it can strip away more than 70 per cent of the gain by the time both countries have taken their share.
Why Canadian funds are PFICs
A foreign corporation is a PFIC if 75 per cent or more of its income is passive, or if at least 50 per cent of its assets produce passive income. Virtually every Canadian mutual fund, exchange-traded fund and pooled fund meets that test, because their business is precisely to hold income-producing securities. Canadian funds are also organised as corporations or trusts that the US does not treat as transparent, so the wrapper itself is the PFIC.
The result is that a US citizen who buys a Canadian equity fund, a bond fund or a broad-market ETF on a Canadian exchange almost certainly owns a PFIC, even though the identical exposure bought through a US-domiciled fund would be entirely benign.
The default §1291 regime
If no election is made, the fund is taxed under the punitive default rules of §1291, known as the excess-distribution regime. When you sell the fund (or receive certain large distributions), the gain is not taxed as a single current-year capital gain. Instead:
- The gain is allocated rateably across every day you held the fund, producing a notional amount for each year in the holding period.
- The portion allocated to the current year is taxed normally.
- The portion allocated to every prior year is taxed at the highest ordinary income rate in force for that year (37 per cent for recent years), regardless of your actual bracket.
- An interest charge is then layered on top of that deferred tax, compounding from each prior year’s due date to the present, as though you had underpaid tax for years.
Two features make this brutal. Capital-gains rates never apply. And the interest charge grows the longer you have held the fund, so long-term, patient investing is penalised hardest.
Why the foreign tax credit does not save you
The instinctive response is that the Canada-US tax treaty and the foreign tax credit (claimed on Form 1116) should prevent double taxation. In the PFIC context they largely do not, for three reasons.
- Character mismatch. Canada taxes the disposition as a capital gain, including only 50 per cent of the gain in income. The US taxes the thrown-back amount as ordinary income. The two taxes fall on differently characterised income, so the Canadian tax does not cleanly offset the US liability.
- Timing mismatch. Canada levies its tax in the year of sale. The US §1291 rules deem most of the tax to belong to earlier years. A foreign tax credit is generally available only against US tax on foreign-source income in the same year, so credits paid “today” cannot reach the throwback tax attributed to years gone by.
- The interest charge is never creditable. No amount of Canadian tax can offset the US interest component, because Canada does not impose an equivalent charge.
The practical consequence is a pool of stranded foreign tax credits: Canadian tax you have genuinely paid but cannot use against the US liability it was supposed to relieve.
A worked example
Assume a US citizen resident in Ontario buys a Canadian equity ETF and holds it for ten years. The fund is a PFIC and no election was made. All figures are in USD for clarity, and the gain on sale is USD 100,000.
Canadian tax on the sale
| Item | Amount |
|---|---|
| Capital gain | 100,000 |
| Taxable portion (50% inclusion) | 50,000 |
| Canadian tax at ~53.5% top rate | 26,750 |
US tax under §1291
The 100,000 gain is spread across ten years at 10,000 per year.
| Component | Amount |
|---|---|
| Prior nine years’ allocation (90,000) taxed at 37% | 33,300 |
| Current-year allocation (10,000) taxed at 37% | 3,700 |
| Interest charge on the deferred tax (compounded) | ~10,600 |
| US tax before credits | 47,600 |
Applying the foreign tax credit
Only the current-year allocation is current-year foreign-source income, so only that slice can absorb Canadian tax. The credit offsets the 3,700 of current-year US tax and no more. The 33,300 of deferred tax relates to prior years (timing mismatch) and to ordinary income (character mismatch); the 10,600 interest charge is non-creditable by statute.
| Component | Amount |
|---|---|
| Canadian tax paid | 26,750 |
| US deferred tax (§1291) | 33,300 |
| US interest charge | 10,600 |
| US current-year tax | 3,700 |
| Foreign tax credit applied | (3,700) |
| Total combined tax | 70,650 |
That is a 70.65 per cent effective rate on a 100,000 gain. Note also the stranded credit: of the 26,750 Canadian tax paid, only 3,700 was usable, leaving roughly 23,050 that relieved nothing.
The precise figure moves with holding period, marginal rates, currency movements and the IRS underpayment rate used for the interest charge, but the structure is robust: the longer the fund is held, the higher the effective rate climbs.
Elections change everything, if made in time
Two elections can escape §1291. A Qualified Electing Fund (QEF) election taxes your share of fund income annually and preserves capital-gains character; a mark-to-market election taxes annual appreciation as ordinary income but avoids the interest charge. Both work best when made for the first year you own the fund, so anyone holding, or contemplating, Canadian funds should take advice before the deadline passes rather than after.
Reporting on Form 8621
Whichever regime applies, each PFIC generally requires an annual Form 8621, filed with your Form 1040, to report distributions, dispositions and any election. Non-filing can keep the statute of limitations open indefinitely, so the form matters even in years with no sale. Given the stakes, the safest course for a US person in Canada is to hold US-domiciled funds, or to plan the PFIC treatment deliberately with a cross-border adviser before investing.
