Selling a Canadian Home as a U.S. Citizen
Canada exempts it; the U.S. may not — the US$250,000 cap, currency gains, and the mortgage trap
Reviewed by the Fairlight Accounting cross-border tax team — U.S. & Canadian Tax Desks
A U.S. citizen in Canada who sells their home usually owes no Canadian tax thanks to the principal residence exemption — but the United States taxes gain above its own exclusion: US$250,000 single or US$500,000 joint, if the two-of-five-year tests are met. The U.S. gain is computed in U.S. dollars, so exchange-rate moves can add taxable gain.
On this page
The two systems
| Canada | United States | |
|---|---|---|
| Exemption | Principal residence exemption — unlimited for designated years | Section 121 exclusion — US$250,000 single, US$500,000 joint |
| Conditions | Ordinarily inhabited; one property per family per year | Owned and used as main home 2 of the last 5 years |
| Currency | Computed in Canadian dollars | Computed in U.S. dollars at each transaction's rate |
| Excess gain | — | Long-term capital gain rates, plus the 3.8 percent net investment income tax if modified AGI exceeds US$200,000 single or US$250,000 joint |
The currency effect
The purchase is converted at the purchase date's rate and the sale at the sale date's rate. A home bought for C$600,000 when the Canadian dollar was strong and sold for C$1.2 million when it's weaker produces a smaller U.S.-dollar gain than the Canadian one — or, in the reverse direction, a larger one.
The mortgage trap
Paying off a Canadian-dollar mortgage is, for U.S. tax, repaying a foreign-currency debt: if the Canadian dollar has weakened since the loan was taken, the U.S. citizen has a taxable foreign currency gain on the repayment, while a currency loss on a personal mortgage isn't deductible. Section 988 itself excludes personal transactions (§988(e)), but under the older rules applied in Rev. Rul. 90-79 the mortgage is a separate transaction from the home — its currency gain is taxed even when the home's gain is excluded, and neither offsets the other.
No credit to offset
Because Canada exempts the gain, there's no Canadian tax to credit against the U.S. tax — the U.S. tax on a large gain is a real cost, which is why U.S. citizens in Canada with high-value homes plan sales, spousal ownership (a non-U.S. spouse's share isn't U.S.-taxable), and timing. Even where Canadian tax is paid, it can't offset the 3.8 percent net investment income tax: the Tax Court so held in Toulouse (2021), and on August 31, 2026 the Federal Circuit applied the same rule to the Canada treaty in Estate of Bruyea v. United States, reversing a Court of Federal Claims ruling for the taxpayer.
Frequently asked questions
Do U.S. citizens pay U.S. tax on selling their Canadian home?
On gain above US$250,000 (single) or US$500,000 (joint), yes — even though Canada exempts it.
Does the exchange rate affect the gain?
Yes — the U.S. gain is computed in U.S. dollars at each transaction's rate.
Can paying off my mortgage create U.S. tax?
Yes — a foreign currency gain on repaying a Canadian-dollar mortgage can be taxable.
Does owning the home with my Canadian spouse help?
Yes — a non-U.S. spouse's share of the gain isn't subject to U.S. tax, as long as you haven't elected to file jointly with them.
Official sources
The IRS explains: “If you meet certain conditions, you may exclude the first $250,000 of gain from the sale of your home from your income and avoid paying taxes on it. The exclusion is increased to $500,000 for a married couple filing jointly.” — Internal Revenue Service, Publication 523 (2025), Selling Your Home, https://www.irs.gov/publications/p523
Next step
Fairlight Accounting is a cross-border accounting and tax practice with a U.S. Tax Desk and a Canadian Tax Desk. Our U.S. Tax Desk and Canadian Tax Desk handle U.S. home sale gain computations for U.S. citizens in Canada, currency and mortgage analysis, and ownership planning. See pricing or book a call.
Cross-border taxes, handled in one place
U.S. and Canadian filings prepared together by our U.S. and Canadian Tax Desks.
Book a free fit call