Do I still get the principal residence exemption after leaving Canada?

Partly, and the way it erodes catches people out. Leaving Canada doesn’t cancel the principal residence exemption, and it doesn’t trigger it either. What happens is quieter: the exemption becomes a fraction, and the years you spend outside Canada sit in the bottom of that fraction without ever appearing in the top. Hold the house long enough as a non-resident and a formula that once sheltered the whole gain shelters a shrinking slice of it, with nothing on any return telling you it’s happening.

Is my Canadian home taxed when I leave?

No. Departure triggers a deemed disposition of most of what you own, but Canadian real property is expressly carved out of it. So there’s no crystallising event on the house when you go, no gain reported, and nothing that locks in the exemption you had built up to that point.

“the taxpayer is deemed to have disposed … of each property owned by the taxpayer other than, if the taxpayer is an individual, (i) real or immovable property situated in Canada, a Canadian resource property or a timber resource property” ITA 128.1(4)(b)

That carve-out is usually described as good news, and in cash-flow terms it is. The consequence is that the property stays inside the Canadian system with its history intact, and the whole question gets settled years later on an actual sale, under a formula that has been quietly counting your non-resident years in the meantime.

How is the exempt portion actually calculated?

By a formula rather than a yes or no. ITA 40(2)(b) starts with the gain you would otherwise have and then subtracts a proportion of it, and the proportion is a ratio of years. The exemption is whatever that subtraction removes.

“the taxpayer’s gain for a taxation year from the disposition of a property that was the taxpayer’s principal residence at any time after the date (in this section referred to as the “acquisition date”) that is the later of December 31, 1971 and the day on which the taxpayer last acquired or reacquired it … is the amount determined by the formula A - (A × B/C) - D” ITA 40(2)(b)

A is the gain worked out in the ordinary way. B and C are both year counts, and D is an adjustment tied to a 1994 election that is zero in most modern files. Everything interesting for someone who has left Canada happens in the difference between how B is counted and how C is counted.

Why do the years after I leave reduce the exemption?

Because residence is a condition of the numerator and not of the denominator. B counts only taxation years for which the property was your principal residence and during which you were resident in Canada. C counts every taxation year you owned it, with no residence condition at all. So a year abroad enlarges C and leaves B alone.

“B is (i) if the taxpayer was resident in Canada during the year that includes the acquisition date, one plus the number of taxation years that end after the acquisition date for which the property is the taxpayer’s principal residence and during which the taxpayer was resident in Canada … C is the number of taxation years that end after the acquisition date during which the taxpayer owned the property whether jointly with another person or otherwise” ITA 40(2)(b)

Put numbers on it. Own the house for twenty years, live in Canada for the first eight and abroad for the last twelve, and B is capped near nine while C reaches twenty. The sheltered fraction is roughly nine twentieths of the gain and the rest is taxable. Nothing went wrong and no deadline was missed. The formula simply did what it says.

Do I lose the plus-one year?

You lose it if you weren’t resident in Canada in the year you acquired the property. The extra year in B isn’t unconditional. It appears in the first branch of the definition, which applies where you were resident in Canada during the year that includes the acquisition date, and the second branch, which covers everyone else, has no plus one in it.

Your situation	Effect on the exemption
Resident in Canada in the acquisition year	The plus-one year is available in B
Bought the property while non-resident	No plus-one year in B
Years resident in Canada with the property designated	Count in both B and C
Years after you emigrate, still owning the property	Count in C only
Sold while still a Canadian resident	The residence condition in B is not a live problem

The plus-one year is small in a long holding period and decisive in a short one. Somebody who buys as a non-resident, becomes resident for two years and sells has a materially different answer from somebody who did the same two years having bought while resident.

What is Form T2091(IND) for?

Designating and calculating. It is where you name the property as your principal residence for particular years and where the year counts turn into a number, which is why the residence condition in B stops being abstract at exactly the point you fill it in.

“T2091IND Designation of a Property as a Principal Residence by an Individual (Other Than a Personal Trust) … Form used by individuals to designate a property as a principal residence and to calculate the capital gain for the year.” CRA, Form T2091(IND)

• Canadian departure tax and Forms T1161 and T1243, which covers what departure does catch
• How to defer Canadian departure tax on Form T1244, for the property that is caught
• Whether you are still a Canadian tax resident, because the year counts in B turn entirely on this

Being clear about what this page does not claim. It doesn’t define what makes a property a principal residence, which lives in ITA 54 and is not sourced here. It does not address the separate rules that apply on a sale of Canadian real property by a non-resident, the designation limits where more than one property is involved, or how the US would tax the same gain. It also makes no claim that any particular year in your own history counts or doesn’t count.

What should I do next?

Count your years before you do anything else. Write down the year you acquired the property, the years you were resident in Canada with it as your principal residence, and the total years of ownership to the date you expect to sell. That ratio is the answer, and you can work it out today for a sale you haven’t made yet. If the fraction is heading somewhere you don’t like, timing the sale is the lever you actually control.

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