Capital gains when selling a business in Canada: the 2026 tax guide

Capital gains when selling a business in Canada are taxed at half: in 2026, only one-half of your gain is added to your income and taxed at your marginal rate. If you sell qualifying shares, the lifetime capital gains exemption can shelter the first $1,275,000 of gain from tax altogether. What you sell, shares or assets, and how early you prepare, decide how much of that you can use.

Plenty of pages online still say the rate is rising to two-thirds, or describe a special lower rate for entrepreneurs. Both proposals were cancelled. Here is how the tax actually works, with a worked example, and the legitimate ways owners keep more.

Do you have to pay taxes on selling a business?

Usually, yes. If you sell for more than the business cost you, the difference is a capital gain, and half of it is taxable. How it is taxed depends on what is sold, and by whom.

• Shares you own personally: the gain is yours, and it may qualify for the lifetime capital gains exemption.
• Assets sold by your corporation: the company pays tax on the gain, and you pay again when you take the money out.
• Assets of an unincorporated business: you sell them yourself, and the exemption generally does not apply, except to qualified farm or fishing property.

Not every dollar of a sale is a capital gain. Inventory is sold as ordinary income, and equipment sold for more than its depreciated tax value brings back earlier deductions as income. This is a large part of why sellers prefer to sell shares, as we explain in share sale vs asset sale in Canada.

How do you calculate capital gains tax when selling a business?

For a share sale, it takes three steps.

• Start with the proceeds: the price you receive for your shares.
• Subtract your adjusted cost base, which is usually what you paid for the shares (for a founder, often a nominal amount), and your selling costs, such as legal and advisory fees. What is left is your capital gain.
• Half of the gain is your taxable capital gain. It is added to your income for the year and taxed at your marginal rate, after any exemption you claim.

The CRA’s capital gains guide sets out the detail. In Ontario the top combined federal and provincial rate is 53.53%, so at the top bracket each dollar of capital gain costs about 27 cents in tax.

A worked example: a $10 million share sale in Ontario

Say you founded your company and own all of its shares, issued to you for a nominal amount. A buyer pays $10 million for them, and your shares qualify for the exemption. Rounded, and assuming every taxable dollar is taxed at Ontario’s top rate:

• Capital gain: $10,000,000.
• Sheltered by the lifetime capital gains exemption: $1,275,000.
• Remaining gain: $8,725,000, of which half, $4,362,500, is taxable.
• Tax at 53.53%: about $2,335,000.
• What you keep: about $7,665,000, before fees.

Without the exemption, the tax would be about $2,676,000. So the exemption saves roughly $341,000. That is real money, but it is a fixed amount whatever the size of the sale, and on a large sale the structure and the preparation around it matter far more. Your actual tax will be somewhat lower, since not every dollar falls in the top bracket. Treat this as an illustration, and ask your accountant to run your own numbers.

Lifetime capital gains exemption 2026: do your shares qualify?

For 2026 the exemption is $1,275,000 per person, and it is indexed to inflation each year. It is a lifetime limit, so anything you have claimed before reduces what is left. Only individuals can claim it. Broadly, your shares must pass three tests to count as qualified small business corporation shares.

• At the time of sale, all or substantially all of the company’s assets by value (in practice, 90% or more) must be used in an active business carried on mainly in Canada.
• Throughout the 24 months before the sale, more than 50% of its assets must meet that same test.
• Throughout those 24 months, no one other than you or a person related to you can have owned the shares.

The first test catches many successful companies. Years of retained earnings sit in the company as cash and investments, and those passive assets count against you. Moving them out, often called purification, can fix the problem. But because two of the tests look back 24 months, it has to be planned well before a sale. Leave it until a buyer arrives and the exemption may simply not be there.

How to reduce capital gains tax on a business sale in Canada

On a sale of any size, you cannot make the tax disappear, and you should be wary of anyone who says you can. There are legitimate ways to keep more, each with conditions your accountant and lawyer must check.

• Sell shares, not assets, where you can. It is the only way to use the exemption, and it avoids the second layer of tax.
• Use more than one exemption. Each individual has their own. If family members own shares directly or through a family trust, each may be able to claim one. This must be set up well in advance, and rules on attribution and income splitting apply.
• Crystallize the exemption. Some owners trigger a gain on paper years before a sale, to use the exemption while they know the shares qualify.
• Spread the gain if you are paid over time. When part of the price is paid in later years, for example through a vendor take-back, you may be able to claim a reserve and report the gain over up to five years, or up to ten for certain transfers to your children and qualifying business transfers (CRA guide).
• Consider an employee ownership trust. Up to $10 million of gains on a qualifying sale to an employee ownership trust can be exempt, a measure made permanent when Bill C-30 received Royal Assent in June 2026.

Selling to your children has its own rules. Special rules for intergenerational business transfers allow capital gains treatment on a sale to a company your children control, but only when strict conditions are met. Start that conversation with your accountant early.

What changed in 2025 and 2026, and what did not

• The inclusion rate is still one-half, for individuals and corporations alike. The proposed increase to two-thirds was cancelled in March 2025.
• The Canadian Entrepreneurs’ Incentive, which would have lowered the rate on up to $2 million of a business owner’s gains, was tied to that increase. Budget 2025 cancelled it as well.
• The exemption’s increase from about $1 million became law when Bill C-15 received Royal Assent in March 2026, and indexing has taken it to $1,275,000 this year.
• The alternative minimum tax still counts 30% of a gain sheltered by the exemption. If most of your gain is sheltered, it can apply even when regular tax is low.

Plan the tax before you agree the price

The structure of a sale is usually fixed in the letter of intent, often in a sentence or two, long before the lawyers draft the agreement. By then, the 24-month clock has already run. That is why tax planning belongs at the start of the 1 to 2 years of preparing a business for sale, not at the end. If you are still weighing the bigger question, start with should I sell my business or keep it.

The tax on a sale is mostly decided before the buyer arrives.

Every situation is different, so confirm the details with your accountant and your lawyer. If you would like to see how a sale might look for you, a short, private conversation is a good place to start.