Capital gains tax in Canada is one of the most generous in the developed world — you only pay tax on half of your gain. But the rules around how the gain is calculated, when it’s triggered, and what’s exempt are dense enough that most people leave money on the table.
The basic math: 50% inclusion rate
If you sell an investment for a profit, only 50% of the gain gets added to your taxable income for that year. So a $20,000 capital gain adds $10,000 to your income; if you’re in a 35% marginal bracket, you pay $3,500 in tax. Effective rate on the gain: 17.5%.
For gains above $250,000 in a single year (per person), the inclusion rate rises to 66.67%. So on a $500,000 gain: 50% inclusion on the first $250K + 66.67% on the next $250K = $291,675 added to your income.
What counts as a capital gain
- Selling stocks or ETFs for more than you paid (in non-registered accounts; gains in TFSA/RRSP/FHSA are tax-free)
- Selling real estate that isn’t your principal residence (rental properties, cottages, US property)
- Selling cryptocurrency for more than you paid
- Selling collectibles, art, gold
- Selling a business or business assets
Adjusted Cost Base (ACB) — the number everyone gets wrong
The “cost” of your investment for capital gains purposes isn’t always what you paid for it. The ACB is your original purchase price, plus commissions, plus any reinvested distributions, divided by total shares owned.
Example: You buy 100 shares at $50 ($5,000). Six months later, you buy 100 more at $60 ($6,000). The fund distributes a $2/share reinvested distribution ($400 of new shares, ~6.5 more shares at $61.50). Your ACB is now ($5,000 + $6,000 + $400) ÷ 206.5 shares = $55.21 per share — not $50, not $60.
If you don’t track ACB correctly, you’ll typically overpay tax (you’ll forget the reinvested distributions) — or underpay (you’ll forget to subtract previously-taxed distributions). The CRA will catch errors years later with interest and penalties.
The Principal Residence Exemption
The single biggest tax break in Canada: the gain on your principal residence is 100% tax-free, no matter how large. A house bought for $200K in 2005 and sold for $1.2M in 2026 generates $1M of capital gain — 100% tax-exempt.
Rules: you (or your spouse, common-law partner, or child) must have “ordinarily inhabited” the home for each year you claim the exemption. Only one home per family per year can be the principal residence. As of 2017 you must report the sale on your tax return (Schedule 3) even though the gain is exempt.
Deemed dispositions — when you “sell” without selling
The CRA treats certain events as if you sold all your assets at fair market value, triggering capital gains tax even though no money changed hands:
- Death: all assets are deemed disposed at fair market value (unless transferred to spouse — that’s a “rollover” and tax is deferred). This is why estates often face huge tax bills.
- Emigrating from Canada: deemed disposition of most assets (Departure Tax). Some assets (Canadian real estate, RRSPs) are excluded.
- Gifting property: giving stocks to your adult child triggers capital gains tax for you, at fair market value.
- Change of use: converting your principal residence into a rental triggers deemed disposition (with an exception you can elect into).
How to legally minimize capital gains tax
- Hold investments in TFSA / RRSP / FHSA first. Gains inside registered accounts are tax-free or tax-deferred.
- Tax-loss harvesting: sell losing investments to realize losses, offset against gains. Losses carry back 3 years or forward indefinitely.
- Time your sales: spread large gains across two tax years to stay under the $250K threshold for the higher 66.67% inclusion rate.
- Donate appreciated stocks to charity: the gain is 100% exempt (vs 50% taxable) AND you get the donation tax credit.
- Use the Lifetime Capital Gains Exemption: small business owners can shelter up to ~$1M of gain on the sale of qualified small business shares.
- Realize gains in low-income years (parental leave, sabbatical, transition year) when your marginal rate is lower.
The 30-day “superficial loss” trap
If you sell at a loss and rebuy the same security within 30 days (before or after), the CRA disallows the loss. This includes purchases by your spouse, your corporation, or your TFSA/RRSP. Workaround: wait 31 days before rebuying, or buy a different (but similar) ETF.
Frequently asked questions
Do I have to pay capital gains tax if I reinvest the proceeds right away?
No — Canada has no “1031-style” rollover for individual investors the way the US does. The moment you sell at a profit in a non-registered account, the gain is realized and taxable in that calendar year, even if the money sits in your brokerage account for 48 hours before going into the next stock. The only true deferrals are spousal rollovers at death, certain small business share reinvestments under Section 44.1, and transfers between registered accounts of the same type.
How does the CRA actually find out about my capital gains?
Canadian brokerages (Questrade, Wealthsimple, RBC Direct, etc.) file T5008 slips for every disposition, and those flow directly into your CRA My Account. Crypto exchanges operating in Canada now report under the new CARF rules taking effect in 2026, and foreign assets over $100,000 cost base must be disclosed on Form T1135. When my mom asked me about this after selling some shares she’d held since the 90s, I had to explain that the broker’s T5008 often shows proceeds but a blank cost base — meaning if you don’t fill in your own ACB on Schedule 3, the CRA’s auto-assessment will treat the entire sale proceeds as the gain.
What happens if I sell a US stock — do I pay tax in both countries?
For capital gains on US stocks held by a Canadian resident, you only pay Canadian tax. The Canada-US tax treaty assigns taxing rights on securities gains to your country of residence, so the IRS doesn’t tax you on selling Apple or Microsoft shares. The catch: you must convert both the purchase and sale into Canadian dollars at the exchange rate on each transaction date, which often creates a different gain than your brokerage’s USD figure suggests.
If I move out of my principal residence and rent it out, what tax do I owe later?
The change of use triggers a deemed disposition at fair market value on the date it becomes a rental, but you can file a Section 45(2) election to defer this for up to four years and keep claiming the principal residence exemption — provided you don’t claim CCA on the property. Without the election, you’ll owe tax on the appreciation that happened during the rental period when you eventually sell. Get an appraisal on the conversion date; the CRA will not accept a guess five years later.
Are capital losses useful if I don’t have any gains this year?
Yes. Net capital losses carry back three tax years (you can amend 2023, 2024, or 2025 returns to recover tax already paid) or carry forward indefinitely against future capital gains. They cannot offset employment or interest income for most people — only capital gains — so the carryforward is the more common play. Track them on your Notice of Assessment; the unused balance is listed every year.
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