Selling Your US House After Moving to Canada: the Two-Year Window, the Arrival Step-Up, and Which Country Taxes What

Selling the old house is the move's cleanest tax event when it happens on schedule and one of its messiest when it drifts. The US side: section 121 excludes up to $250,000 of gain ($500,000 married filing jointly) if you owned and used the home as your main home for two of the five years before sale — a test you satisfy on the day you move out and then gradually lose, because the five-year window keeps sliding while your use years stay fixed. Move out, and you have roughly three years to close a sale with the full exclusion intact. The Canadian side: on becoming a resident, you are deemed to acquire the house at fair market value, so Canada taxes only post-arrival appreciation — and if the property is not your residence anymore (you live in Canada now), that post-arrival gain is ordinary capital gain territory unless facts support a principal-residence position for some period. Sell within a year or two of arriving and the post-arrival gain is usually small; hold five years in a rising market and Canada has a real claim on growth the US exclusion never touches. Renting the house out changes both sides: depreciation recapture on the US return (not excludable under 121), rental income taxable in both countries in the meantime, and a stronger Canadian position that the property is an investment.

Key takeaways

• The US clock: two years of ownership and use within the five years before sale. Moving out starts the countdown — a sale within about three years of moving out preserves the full exclusion; later sales lose it entirely (the test fails all at once, not gradually).
• Gain above the exclusion is long-term capital gain on the US return; state tax follows the property's state for real-estate gain even after you left the state.
• Canada's claim: deemed acquisition at arrival-date fair market value — get a real appraisal or broker opinion dated to arrival and keep it forever. Canada taxes the gain from that value, in Canadian dollars (so FX movement is part of the Canadian gain even if the US-dollar price is flat).
• Both countries at once: for a sale after arrival, the US taxes historic gain less the exclusion; Canada taxes post-arrival gain. Foreign tax credits coordinate any overlap on the same slice — typically the post-arrival appreciation, where US tax (if the exclusion is exhausted) credits against Canadian tax on the same period's gain.
• Renting it out: rental income files in both countries with credits; US depreciation is mandatory-in-effect and recaptured at sale outside the exclusion; Canada wants the net rental income annually and the T1135 line (a rented US property is specified foreign property; a personal-use home is not).
• The mortgage FX footnote: paying off a US-dollar mortgage after arrival can create a Canadian FX gain or loss on the debt itself — a genuinely surprising line item on large mortgages when the currencies have moved.

Sell, rent, or keep: the framework

Sell within the window when the gain is large relative to the exclusion horizon and the house is not coming back into your life — the combination of a preserved 121 exclusion and a near-zero Canadian gain is as good as real estate tax gets. Rent deliberately, not by inertia: the arithmetic must beat the after-tax alternative once two-country compliance, depreciation recapture, and the shrinking exclusion are priced. Keep as a true second home (no rent) if the plan is genuine use — the 121 clock still runs out, but Canada's claim stays limited to post-arrival gain and the property stays off the T1135.

Worked example

A couple moves from Portland to Toronto on July 1, 2026, leaving a house bought for US$400,000, worth US$820,000 at arrival. Path one — sell March 2027: US gain US$430,000 (sale at US$830,000), fully inside the US$500,000 joint exclusion; Oregon part-year return reports the excluded sale per state rules; Canada's gain is the C$-measured appreciation from July 2026 to March 2027 — modest, taxed at half-inclusion. Combined tax: close to zero, by design. Path two — rent it until 2031: five years of dual-country rental reporting, US depreciation of roughly US$100,000 recaptured at 25% on sale, the 121 exclusion gone (last qualifying use ended mid-2026), the full US$500,000-plus gain US-taxable, and Canada taxing five years of appreciation from the arrival value, credits sorting the overlap. Path two can still win if Portland rents and appreciation are strong — but it wins as an investment decision carrying a six-figure tax cost that path one simply did not have. The couple sells, and their arrival-date appraisal, ordered the week they landed, is the number that made the Canadian side a footnote.

Official sources

The IRS states a taxpayer may "exclude up to $250,000 of that gain from your income, or up to $500,000 of that gain if you file a joint return with your spouse," if they "owned the home for at least 24 months (2 years) out of the last 5 years" and used it as a residence for the same period. — Internal Revenue Service, Topic No. 701, Sale of Your Home, https://www.irs.gov/taxtopics/tc701

The CRA explains how to calculate and report capital gains and losses, including the inclusion rate and the treatment of net capital losses. — Canada Revenue Agency, Capital gains, https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/personal-income/line-12700-capital-gains.html

Practitioner note

The house question rewards speed and punishes drift: the exclusion is use-it-or-lose-it on a three-year fuse, and the arrival appraisal — a phone call and a few hundred dollars in week one — is the document that caps Canada's claim at the truth. Our rule for movers: decide sell-versus-rent as a real decision within the first year, and if the answer is sell, the fuse is already burning.

See also: Browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the sale-timing analysis for the US home — exclusion window, arrival valuation, state tax, and the rent-versus-sell model with both countries priced in. See cross-border pricing or book a call.