Canadian Marrying an American or Getting a Green Card: The Tax Consequences Nobody Puts in the Vows

Every work visa in this series comes with the same caveat: your tax residency depends on counting days. The green card deletes the caveat. Under the green card test, you are a U.S. tax resident from the moment you're a lawful permanent resident — first day, worldwide income, full reporting stack, no arithmetic. And for the many Canadians who get there through marriage to an American, the tax consequences start even before the card, because marriage itself reshapes how you can file.

Here's the picture for Canadians crossing for love or permanence.

Married filing options: a genuine choice, worth modeling

Marry a U.S. citizen or resident while you're still a Canadian nonresident, and U.S. law offers a real election: you can choose to treat the nonresident spouse as a U.S. resident for tax purposes and file jointly. Joint rates and brackets are often better — but the price is that the Canadian spouse's worldwide income (and foreign accounts) enter the U.S. system immediately, sometimes a year or more before the move itself. Depending on your incomes, the alternative — the American filing separately while the Canadian remains outside the system until arrival — can be better. This is one of the few genuinely optional levers in cross-border tax; model it, don't default.

no joint return shall be made if either the husband or wife at any time during the taxable year is a nonresident alien

Each spouse must report their entire worldwide income for the year you make the choice and for all later years unless the choice is ended or suspended.

The green card switches everything on at once

The day permanent residency starts, so does:

• U.S. tax on worldwide income — including anything still happening in Canada (employment income, rental property, investment income), reconciled through foreign tax credits and the treaty;
• the full reporting stack: FBAR on Canadian accounts past $10,000 combined (the guide), Form 8938 where thresholds are met, the RRSP's reportable-but-deferred treatment, and the TFSA problem — an account the U.S. taxes and papers heavily, best resolved before residency begins;
• and, in your arrival year, typically a dual-status return unless a full-year election makes more sense.

Meanwhile Canada expects its proper goodbye: a final return with a departure date and departure tax — a deemed sale of your non-registered investments on the way out. For couples, the timing of the wedding, the card, and the move can each shift which country taxes what; sequencing is worth real attention.

The long-game trap: the exit tax

Here's the part specific to permanent residency that nobody mentions during the immigration process. Hold a green card long enough — roughly 8 of the last 15 years — and you become a "long-term resident." Give the card up after that (retiring back to Canada is the classic scenario) and, if your assets or tax history cross certain thresholds, the U.S. expatriation tax can apply: a deemed sale of your worldwide assets on the way out of America, mirroring the one Canada charged on the way in. It's entirely manageable — with planning, years ahead. It's expensive as a surprise. If there's any chance your American chapter isn't forever, keep this on the radar from year one.

Love simplifies nothing (in tax)

Marriage-based moves feel informal — no employer, no HR packet, often no advisor at all. Which is exactly why they produce the most missed FBARs, unfiled Canadian departure returns, and TFSAs quietly accruing U.S. problems. The paperwork is the same as an executive transfer; only the send-off party differs.

---

Related reading: - I Moved From Canada to the U.S. — How Do I File My Taxes? - FBAR for Canadians Living in the U.S. - U.S. Taxes for Canadians, by Visa Type: The Complete Guide Hub