Capital Gains Tax When Selling a House in Canada: The Three Cases

Capital gains tax when selling a house in Canada turns on one question: how was the property used in each year you owned it? The answer sorts every sale into one of three cases, and each case has its own reporting, its own arithmetic and its own ways to reduce the bill. This guide sets out the three, works them on Canmore prices, and points to the deeper guides for the cases that need them.

The three cases for capital gains tax when selling a house

The inclusion rate is one-half. The federal government proposed raising it to two-thirds for gains above $250,000 in 2024, deferred it, and cancelled it in March 2025, so half of a capital gain is added to your income, whatever its size.

Case 1: your principal residence

A home you, your spouse or your children lived in can be designated as your principal residence, and the gain for each designated year is exempt. A family unit can designate only one property for any given year, which is the rule that matters to the many Canmore owners who also own a home in Calgary or elsewhere. The exemption is worked with a simple fraction: the gain multiplied by one plus the number of years designated, divided by the number of years owned. The "plus one" means a family that sells one home and buys another in the same year does not lose a year.

Since the 2016 tax year, every sale must be reported even when it is fully exempt. Leaving the designation off the return can cost the exemption entirely, and the late-designation penalty is real. That reporting step is the single most common mistake on an exempt sale.

Case 2: the Canmore second home or condo

Take an illustrative case, not a quote: a Canmore apartment condo bought in 2016 for $500,000 and sold in 2026 at the 2025 average of $814,000. Commission on the Alberta convention is $28,420 plus $1,421 GST, and legal fees about $1,500, so selling costs come to about $31,341. With $20,000 of documented capital improvements and $3,000 of purchase legal and registration costs, the adjusted cost base is $523,000.

Sale price

$814,000

2025 average apartment condo, illustrative

Adjusted cost base

$523,000

$500,000 + $20,000 improvements + $3,000 purchase costs

Selling costs

$31,341

commission, GST, $1,500 legal

Capital gain

$259,659

sale − cost base − selling costs

Taxable (one-half)

$129,830

added to income in the year of sale

Tax on $90,000 of other income

about $48,100

2026 federal and Alberta rates

The same condo designated as a principal residence for part of the ownership period shelters that share of the gain. Whether to designate the Canmore property or the city home for a given year depends on which has the larger gain per year, which is the arithmetic the principal residence exemption guide works through.

Case 3: rental, inherited or converted

A rental adds a second tax line: if you claimed capital cost allowance on the building, the amount claimed is recaptured as income on the sale, in full, on top of the taxable half of the gain. A home that changed use, from personal to rental or the reverse, is deemed to have been sold and reacquired at fair market value at the change, unless you file an election to defer it (an election that is not available once capital cost allowance has been claimed on the property); the selling a rental property in Canmore guide covers the elections and the tenant rules. An inherited home is deemed sold at fair market value immediately before death, unless it passes to a spouse, and the gain to that date is taxed on the deceased's final return; the heir's cost is that value.

What reduces the gain, legitimately

Every dollar of the adjusted cost base and every dollar of selling cost comes off the gain. The cost base includes the purchase price, the Land Titles registration and legal fees on the purchase, and capital improvements: a new roof, an addition, a kitchen replaced, a deck rebuilt. Repairs that restore rather than improve, and ongoing maintenance, do not count. Selling costs include commission and the GST charged on it, and the legal fees on the sale. Keep the receipts; the CRA can ask, and a cost you cannot prove is a cost you did not have. The cost to sell a house in Canmore guide lists the selling costs line by line, and lawyer fees for selling a house in Alberta covers the legal side.

How much you keep after tax and costs

Capital gains tax when selling a house is one line in a larger calculation. The home sale proceeds calculator takes the sale price through commission, GST, legal fees, the mortgage payout and the adjustments to the figure that reaches your account; subtract the tax worked out above and you have what the sale is actually worth to you. For a second home, run it against keeping and renting the property for a year, which the calculator also does.

Run your own numbers

The capital gains tax calculator works the same arithmetic on your figures at 2026 federal and Alberta rates: cost base, selling costs, the principal residence share, the taxable half, and the tax it adds to your other income.

The tax is one line of the sale; selling a house in Canmore sets out the price, the costs, the timing and the agent in the order they come up.

What this means if you are selling

Sort your sale into one of the three cases first, then pull the receipts that build the cost base, then talk to an accountant before the sale is firm if the gain is large, because timing against your other income can matter as much as anything on this page. Capital gains tax when selling a house in Canada is rarely the surprise people fear when the designation, the cost base and the reporting are done properly.