Selling Your Home Cross-Border: Canada-US Tax Exclusions

Both Canada and the US offer a tax break on the sale of your home, but the two systems work differently, cover different periods, and do not coordinate with each other. Canada’s principal residence exemption (PRE) under ITA 40(2)(b) can eliminate the entire capital gain on a qualifying home. The US Section 121 exclusion under IRC 121 excludes up to $250,000 of gain ($500,000 for married filing jointly) if you lived in the home for at least two of the five years before the sale. When you sell a home after moving across the border, one country’s exemption may apply while the other’s does not, and the gap can produce a tax bill you did not expect.

How does the Canadian principal residence exemption work?

The PRE eliminates the capital gain on the sale of a qualifying principal residence. The exemption is calculated using a formula:

Exempt portion = (1 + number of years designated as principal residence) / number of years owned

The “+1” in the numerator is a buffer that allows you to designate a new home as your principal residence in the year of purchase while still covering the prior home. Each family unit (you, your spouse, and minor children) can designate only one property as a principal residence per year.

To qualify, the property must be “ordinarily inhabited” by you, your spouse, or your child during the year. The CRA does not require that it be your primary residence for the entire year; seasonal use can qualify if the property is ordinarily inhabited at some point.

When you sell, you report the sale on Schedule 3 and designate the property on Form T2091. If the exemption covers the entire gain (designation for all years owned), there is no taxable capital gain.

How does the US Section 121 exclusion work?

The Section 121 exclusion excludes up to $250,000 of gain ($500,000 for married filing jointly) from the sale of your “main home” if you meet the ownership and use tests:

• Ownership test. You owned the home for at least two of the five years before the sale.
• Use test. You used the home as your main home for at least two of the five years before the sale.

The two years do not need to be consecutive, and the ownership and use periods do not need to overlap (though they usually do). The exclusion can be used once every two years.

If you do not meet the two-out-of-five-years test, a partial exclusion may be available if the sale was due to a change in employment, health, or unforeseen circumstances (Treas. Reg. 1.121-3). The partial exclusion is prorated by the fraction of the two-year period you met.

What if you sell the Canadian home after moving?

This is the most common cross-border home-sale scenario, and it produces the biggest gap:

Year 1: You live in your Canadian home. It is your principal residence in Canada and your main home for US purposes (if you are a US person).

Year 2: You move to the US. The Canadian home is no longer your main home. You may rent it out or leave it vacant.

Year 3-5: You sell the Canadian home.

Canadian side: The PRE can still cover the gain. You designate the home for the years you lived in it, and if the formula covers all years owned, the gain is eliminated. Even after you leave Canada, the designation can cover the years the home was your principal residence.

US side: If you sell within three years of moving, you may still meet the two-out-of-five-years use test (you used the home as your main home for at least two of the five years before the sale). If you sell after three years, you no longer meet the use test, and the Section 121 exclusion is unavailable. The full gain (in USD, based on your USD cost basis) is taxable as a capital gain on your US return.

What if you sell within three years of moving?

If you sell within three years, the Section 121 use test is met (you used the home as your main home for at least two of the five years before the sale). The exclusion covers up to $250,000 ($500,000 MFJ) of gain. On the Canadian side, the PRE covers the full gain (designation for all years owned, because you lived in it every year until the sale or close to it).

Result: the gain is eliminated on both sides. This is the cleanest outcome, and it is why advisors recommend selling the home before the three-year window closes.

What about the Canadian home that becomes a rental?

If you rent out the Canadian home after moving to the US, two additional issues arise:

1. Change of use. The CRA treats the start of renting as a change of use, which triggers a deemed disposition at fair market value on the date the use changed (ITA 45(1)). However, you can elect under ITA 45(2) to defer the change of use and continue designating the home as your principal residence for up to four additional years (even though you are not living in it). This election preserves the PRE for those four years.

2. Rental income reporting. Once the home is rented, you report rental income in both countries. On the Canadian side, as a non-resident, you file a section 216 return and may need Form NR6 to reduce withholding from 25% of gross rent to tax on net income. On the US side, the rental income is foreign-source income reported on Schedule E, with the FTC for Canadian tax paid.

The ITA 45(2) election is powerful: it lets you keep the PRE designation for up to four years after you stop living in the home, which can cover the entire ownership period if you sell within four years of moving. Combined with the Section 121 timing, selling within three years of moving covers both countries’ exemptions.

What about a US home sold after moving to Canada?

The reverse scenario: you own a home in the US, move to Canada, and sell the US home later.

US side: Section 121 applies if you meet the two-out-of-five-years use test. If you sell within three years of moving, the test is met, and up to $250,000 ($500,000 MFJ) of gain is excluded.

Canadian side: Canada acquired the right to tax you on the gain because you are now a Canadian resident. But Canada gives you a stepped-up cost basis on the date you became a Canadian resident (ITA 128.1(1)(b)), so only the gain that accrued after you arrived in Canada is subject to Canadian tax. If you sell shortly after moving, the Canadian gain is minimal.

The US-to-Canada direction is generally cleaner than Canada-to-US, because Canada’s stepped-up basis on arrival limits the Canadian gain, and the Section 121 exclusion covers the US gain.

What should I do next?

If you are planning a cross-border move and own a home, map the timeline before you list the property. The interaction between the PRE and Section 121 is predictable and plannable, but only if you act within the windows.

• Principal residence exemption cross-border, the PRE mechanics and the one-property-per-family rule
• PRE after leaving Canada (T2091), the designation process on the departure return
• Departure tax overview, the deemed disposition on leaving Canada
• Canadian rental after moving to the US, the NR6 and section 216 return
• Moving to the US from Canada: tax checklist, the full checklist including home-sale timing

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.