The principal residence exemption is not automatic and it is not all-or-nothing. It is a fraction, and the years you did not designate are the years that cost you.
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Enter the sale proceeds, your adjusted cost base, and how many of the years you owned it were designated as your principal residence.
This tool computes the exempt fraction only. The inclusion rate that applies to any remaining taxable gain has changed, been deferred and been reversed across recent federal budgets — confirm the rate for your year of disposition before relying on a dollar figure.
The calculator above does the actual math for you.
The exempt portion is the gain multiplied by one plus the number of years designated, divided by the number of years owned. The extra year exists so that someone who buys a new home before selling the old one does not lose a year to the overlap.
The plus-one year is only available if you were resident in Canada in the year you acquired the property. Non-residents at acquisition lose it, which quietly changes the answer.
One property per year, and a trap in changing how you use it.
A property can only be designated for years in which you or your family ordinarily inhabited it, and a family unit can only designate one property per year. Cottage owners face this directly — designating the cottage for a year → means not designating the house.
Renting the property out, or converting part of it to income use, triggers a change-of-use rule → and can deem a disposition at fair market value even though nothing was sold. Elections exist that defer this, but they must be filed.
Report the sale either way. A disposition of a principal residence has to be reported even when the gain is fully exempt, and the penalty for not reporting is real.
Say you sell for $900,000 a property with an adjusted cost base of $500,000 — a $400,000 gain — owned for 20 years but designated as your principal residence for only 15 of them (a cottage was designated for the other 5):
That $80,000 is the figure an inclusion rate would then apply to — confirm the rate for your year of disposition rather than assuming one. Run your own proceeds, cost base and years in the calculator above.
The exempt portion of the gain is the gain multiplied by one plus the number of years the property was designated as your principal residence, divided by the number of years you owned it.
It covers the year in which you buy a replacement home before selling the old one, so the overlap does not cost you a year of exemption. It is available only if you were resident in Canada in the year you acquired the property.
Not for the same years. A family unit can designate only one property as its principal residence for any given year, so designating the cottage for a year means giving that year up on the house.
Yes. A disposition of a principal residence must be reported on your return even where no tax is payable, and failing to report can attract a penalty.
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