Selling a Rental Property in Ontario? Here's How Capital Gains Tax Works

Selling an investment property is one of the largest single tax events most people ever deal with — and the bill is often bigger than owners expect, mostly because they haven't factored it into the sale price ahead of time. Here's how the calculation actually works.

How capital gains on a rental property are calculated

In simple terms, your capital gain is your sale proceeds minus your adjusted cost base minus selling costs (like real estate commissions and legal fees). That gain — not the full sale price — is what gets factored into your tax return.

Why your adjusted cost base matters so much

Your adjusted cost base (ACB) isn't just your original purchase price. It includes the purchase price plus closing costs at the time you bought, plus the cost of capital improvements you made over the years — a new roof, a kitchen renovation, an addition. Routine repairs and maintenance don't count, which is a distinction that trips up a lot of landlords. Keeping records of every capital improvement over the years you owned the property can meaningfully reduce your taxable gain when you sell.

The taxable portion of the gain

Not all of your capital gain is taxed — only a portion of it is included in your taxable income, at your marginal tax rate. The exact inclusion rate is set by federal tax rules and can change, so it's worth confirming the current rate at the time of your sale rather than relying on what it was in a previous year.

Depreciation recapture, if you claimed CCA

If you claimed Capital Cost Allowance (CCA) — the tax term for depreciation — on the property over the years to reduce your rental income, selling the property can trigger "recapture." This means some or all of the CCA you previously deducted gets added back into your income in the year of sale, taxed as regular income rather than as a capital gain. This is one of the most commonly overlooked pieces of a rental property sale, and it can be a meaningful amount if you claimed CCA for several years.

How to plan ahead of a sale

• Estimate the tax bill before you list. A rough calculation before the sale gives you room to plan — for the closing date, for instalment payments, or for offsetting strategies.
• Gather your capital improvement records now. Receipts and invoices for renovations done years ago are much easier to find before a sale than after.
• Check whether any portion qualifies as a principal residence. If you lived in the property for part of the time you owned it, part of the gain may be eligible for the principal residence exemption — this requires careful calculation, not a guess.
• Consider timing. The tax year in which the sale closes, and your income in that year, both affect how much tax you'll actually pay on the gain.