The Principal Residence Exemption in Canada

The principal residence exemption is a CRA rule that lets you avoid paying tax on the capital gain when you sell the home you live in. If a property qualifies and you designate it as your principal residence, the resulting gain can be reduced — or wiped out entirely. It is one of the most valuable tax breaks available to Canadian homeowners, and one of the most misunderstood.

What the Principal Residence Exemption Actually Does

When you sell a property that is not your principal residence, the increase in its value is a capital gain, and the CRA taxes a portion of that gain as income. The exemption changes the math on the gain itself: you subtract the exempt portion before the taxable amount is calculated. In many cases the gain disappears completely and you owe nothing on the sale.

Two limits matter. First, the exemption covers the gain, not the income the property produced — rental income you collected along the way stays taxable in the year you received it. Second, it is not a refund or a credit that shows up automatically. You have to report the sale and, where needed, make the designation on your return.

Which Properties Qualify as a Principal Residence

To qualify, a property must be a housing unit that you own and that you ordinarily inhabited at some point during the year. You can own it outright, hold a leasehold interest in it, or hold a share of a co-operative housing corporation that gives you the right to live in a unit. Common qualifying properties include:

• A detached or semi-detached house, townhouse, or duplex
• A condominium or apartment
• A cottage or cabin
• A mobile home or trailer
• A houseboat

The land around the home counts too, but only up to a point. The exemption generally covers about half a hectare — roughly one and a quarter acres — plus any additional land you can show is necessary for the home's use. Land beyond that is treated separately, and a gain on it can be taxable.

There is also a residency condition: you generally need to be a resident of Canada in the years you designate. And the designation is shared — you, your spouse or common-law partner, and your unmarried children under eighteen can only designate one property between you for any given year, so a family unit cannot shelter two homes at once.

How the Exemption Is Calculated

The CRA uses a formula that spreads your gain across the years you owned the property:

Capital gain × (1 + number of years designated as a principal residence) ÷ number of years you owned the property

Part of the formula	What it means
Your capital gain	The sale price minus the adjusted cost base and selling costs
Years designated	The years you choose to treat the property as your principal residence
The extra "+1"	One bonus year, available to individuals only — not to trusts
Years owned	Every year you held the property, including years you did not designate

The "+1" is generous for short ownership. If you owned a home for ten years and designated it for nine, the formula exempts the entire gain. It exists largely to smooth over years when you owned two homes at once — a common situation when you buy a new house before selling the old one. If you owned a property for a single year and designate it, the gain can be fully exempt as well.

Trusts, including alter ego and joint partner trusts, do not get the extra year, so their calculations look different.

Choosing Which Property to Designate

You designate a property by reporting the sale and identifying the years on your return. You do not have to designate every year, and you do not have to designate the same property every year. If you own a city home and a cottage, you can pick the property with the larger expected gain and use your designation years there.

Because only one property per family unit can be designated per year, planning matters. Where gains are large, the difference in tax between designating one property versus another can be substantial. A tax professional can model the options. For a detailed look at what happens when a property does not qualify, see capital gains on a second property in Canada.

You Still Have to Report the Sale to the CRA

Even when the entire gain is exempt, you must report the sale of your principal residence on your tax return. In practice that means Schedule 3 and, for a designated property, Form T2091 (or Form T1255 for a trust). The CRA can reassess a return that leaves the sale out, and penalties may apply for failing to report.

If you missed reporting in an earlier year, the CRA has a late-designation process you can ask about, but relief is not guaranteed. Confirm the current forms and deadlines on the CRA website, and speak with a qualified tax professional about your own situation.

When the Exemption Shrinks: Rentals, Business Use, and Change of Use

If you rent out part of your home or run a business from it, only the portion you use as your residence may qualify. Where the rental or business use is ancillary to your main use of the home as a residence — and you never claimed capital cost allowance (CCA) on it — the CRA may still allow the full exemption, but this is fact-specific and worth confirming.

Change of use is the bigger trap. When you move out of your home and convert it to a rental, the CRA generally treats you as having sold it at fair market value at that moment, which can trigger a gain. A subsection 45(2) election can defer that deemed disposition and let you keep designating the property for a limited period, generally up to four years. You generally cannot make this election in a year you claim CCA on the property.

Moving the other way — from a rental you owned into it as your home — is handled by a subsection 45(3) election, which can also defer the deemed disposition. These elections are technical and the details matter. For the rental side of the picture, see counting rental income for mortgage qualification, and for holding taxes that can apply to empty or underused homes, see vacant home tax and the underused housing tax.

The Exemption and Your Mortgage

The principal residence exemption is a tax rule, not a lending rule. It does not count as income on a mortgage application, and no lender will let you borrow against a gain you have not realized. If your plan is to sell, use the exemption to avoid tax, and roll the proceeds into the next purchase, remember that the exemption does not create cash at closing — it only keeps the CRA from taking a slice of the value you already built.

Your next mortgage still has to clear the federal mortgage stress test, and any rental property you keep will be assessed under the income rules lenders always use. Run your numbers before you commit: see the Canadian mortgage stress test explained, land transfer tax in Canada by province, and our mortgage affordability calculator.