Understanding Capital Gains Tax in Canada: What Every Investor Should Know

Whether you are selling a stock portfolio, a rental property, or a business, understanding how capital gains are taxed is essential. A capital gain occurs when you sell a capital asset for more than its Adjusted Cost Base — the original purchase price plus costs incurred to acquire or improve the asset. Unlike employment or interest income, which is fully taxable, capital gains receive preferential treatment in Canada.

The inclusion rate

The fundamental concept is the "inclusion rate" — the percentage of the capital gain that must be included in taxable income. Historically the rate has been 50%, meaning a $100,000 gain added only $50,000 to taxable income. Recent federal budgets introduced tiered rates: for individuals, the first $250,000 of gains in a year remain at 50%, with the excess at 66.67%. For corporations and trusts, the 66.67% rate applies to all capital gains regardless of amount.

Capital losses

If you sell an asset for less than its ACB, you realize a capital loss. Capital losses cannot offset regular income (like salary or interest); they only offset capital gains. Net capital losses can be carried back up to three years to recover past taxes, or carried forward indefinitely.

The Principal Residence Exemption

When you sell a property that qualifies as your principal residence, the entire gain is exempt from tax. You or a family member must have ordinarily inhabited the property during the year. A family unit can only designate one property as principal residence per year, so families with a home and a cottage must strategically decide which to designate upon sale.

Corporate capital gains and the CDA

When a corporation realizes a capital gain, the non-taxable portion is added to the Capital Dividend Account (CDA). The corporation can then pay out the CDA balance as a tax-free capital dividend to Canadian-resident shareholders. This mechanism allows the tax-free portion of the gain to flow through to the individual without double taxation.