Why only half the gain is taxed
Canada's capital gains inclusion rate is 50% for 2026 — a proposed hike to 66.67% on gains above $250,000 was announced in 2024, deferred, and then cancelled entirely in March 2025, so it never actually took effect despite a lot of planning and news coverage built around it. So only half of your profit gets added to your income and taxed at your marginal rate; the rest is yours tax-free. This calculator is for investment properties only — a principal residence is generally exempt from capital gains tax entirely under Canada's principal residence exemption, one of the more valuable tax breaks available to Canadian homeowners.
What counts toward your adjusted cost base
Your adjusted cost base isn't just what you paid for the property — it includes the purchase price plus capital improvements made over your ownership period, such as a new roof, a major renovation, or an addition. Routine repairs and maintenance (painting, fixing a leaky faucet) don't count, only improvements that add lasting value to the property. Keeping receipts for major renovation work over the years you own an investment property genuinely matters here, since a higher cost base directly reduces your taxable gain when you eventually sell.
Why your marginal tax rate matters more here than the inclusion rate
The 50% inclusion rate is fixed and the same for everyone, but the actual tax owed on that taxable half depends entirely on your marginal tax rate — the rate on your next dollar of income, which depends on your total income for the year including the gain itself. Because a large capital gain gets added on top of your regular income, it can push part of the gain into a higher tax bracket than your regular salary alone would suggest, which is worth knowing before assuming your usual marginal rate applies cleanly to the whole gain.
Timing a sale across tax years
Some investors deliberately time a sale's closing date to fall in a lower-income year — after retiring, during a parental leave, or in a year with unusually low other income — specifically to reduce the marginal rate applied to the gain. This isn't relevant to everyone, but for a large enough gain, shifting the sale by even a few months into a different calendar year can make a meaningful difference to the total tax owed.
Selling and want the full closing-day picture? Combine this with the cost of selling calculator for commission, legal fees, and mortgage payout together, or check mortgage penalty if you'd be breaking your term early.