Principal Residence Exemption
The Principal Residence Exemption allows you to eliminate all or part of the capital gain when you sell your home, provided you designate it as your principal residence for each year you owned it. For most homeowners selling their only home, the entire gain is tax-free.
You can only designate one property as your principal residence per year (per family unit). If you own multiple properties — for example, a house and a cottage — you'll need to calculate which designation strategy produces the largest total exemption. The exemption formula is: gain × (1 + years designated) / years owned.
Since 2016, all sales of a principal residence must be reported on your T1 return (Schedule 3), even if the gain is fully exempt. Failure to report can result in the CRA denying the exemption. If you change the use of a property (e.g. from principal residence to rental), this triggers a deemed disposition that may need to be reported.
How it works
The exemption formula, gain x (1 + years designated) / years owned, includes a deliberate '+1' that covers the transition year when you might briefly own two homes — selling your old principal residence shortly after buying a new one, for example — so you don't lose exemption coverage for that overlap year even though you technically owned two properties at once.
Only one property per family unit can be designated as the principal residence for any given calendar year, which creates a real planning decision for families who own both a house and a cottage or vacation property. The generally optimal strategy is designating whichever property is appreciating faster on a per-year basis, since that concentrates the exemption where it saves the most tax.
Converting a principal residence to a rental property, or a rental property to your principal residence, generally triggers a deemed disposition at fair market value on the date of the change — though an election may be available in some circumstances to defer that deemed disposition, which is a decision worth getting professional advice on given the amounts involved. Since 2016, every sale of a principal residence must be reported on Schedule 3 of your T1, even when the exemption fully eliminates the taxable gain; skipping this reporting risks the CRA denying the exemption altogether.
Example: Partial exemption on a mixed-use property
You owned a property for 10 years but only designated it as your principal residence for 6 of those years — it was a rental for the other 4. On a $200,000 gain, the exempt portion is 200,000 x (1 + 6) / 10 = $140,000.
The remaining $60,000 is a taxable capital gain. At the 50% inclusion rate, $30,000 of that is added to your income and taxed at your marginal rate — only the non-designated years' share of the gain loses the exemption.
Frequently asked questions
Can I designate two properties as my principal residence in the same year?
No — only one property per family unit can be designated as the principal residence for any single calendar year, even if you own more than one qualifying home.
What happens if I convert my home into a rental property?
It generally triggers a deemed disposition at fair market value, though an election may be available in some circumstances to defer it — this is a situation where professional advice is worthwhile.
Do I need to report the sale of my home if the gain is fully tax-free?
Yes — since 2016, every principal residence sale must be reported on Schedule 3 of your T1 return, even when the Principal Residence Exemption fully offsets the gain.
Related Terms
Capital Gains
A capital gain arises when you sell a capital property — such as stocks, mutual funds, ETFs, real estate (other than your principal residence), or cryptocurrency — for more than its adjusted cost base (ACB).
ACB (Adjusted Cost Base)
The Adjusted Cost Base (ACB) is the cost of an asset for tax purposes, used to calculate capital gains or losses when the asset is sold.