The lifetime capital gains exemption when you sell your business

For many Canadian owners, the lifetime capital gains exemption is the single biggest tax question in selling a business. Used well, it can mean no regular income tax on a large part of your gain. Used too late, or on the wrong kind of sale, it may not help at all. Here is how it works, in plain words, so you can plan with your accountant in good time.

The short answer

The lifetime capital gains exemption lets an individual who lives in Canada earn a set amount of capital gains, over their lifetime, without regular income tax, when they sell certain property. For business owners, that property is qualified small business corporation shares. The CRA lists the limit as $1,275,000 of capital gains for 2026, and it is indexed to inflation each year.

Three things decide whether it helps you:

• The type of sale. It generally applies when you sell shares of your corporation, not when the corporation sells its assets.
• Whether the shares qualify. The company and the shares must pass three tests, two of which look back 24 months.
• Your own room. It is a lifetime limit per person, so any exemption you claimed in the past reduces what is left.

How it shows up on your tax return

Only half of a capital gain is normally included in income. So on your return, the exemption appears as a capital gains deduction of up to half the limit, which is $637,500 for 2026. That deduction cancels the taxable half of a qualifying gain of up to $1,275,000. You claim it on line 25400 of your return for the year you sell.

Which sales can qualify

If your business is incorporated, a buyer can buy your shares or buy the assets from your company. Our guide to asset sale vs share sale explains both. For the exemption, the difference is simple:

• Share sale: you, as a person, sell your shares and make the gain. If the shares qualify, the exemption may apply.
• Asset sale: your company sells its assets and makes the gain inside the company. The exemption generally does not apply to that gain.
• Sole proprietor or partnership with no company: there are no shares, so the exemption generally does not apply to an ordinary business. Qualified farm and fishing property follows its own rules.

Buyers often prefer to buy assets, so the exemption can become part of the price conversation. Some sellers accept a slightly lower price for a share sale because they keep more after tax. Work out both numbers with your accountant before you agree the structure in your letter of intent.

The three tests for your shares

CRA Guide T4037 sets out the conditions. In plain terms:

1. At the time of sale (the 90% test). The company is a Canadian controlled private corporation, and 90% or more of the value of its assets is used mainly in an active business carried on mainly in Canada.
2. The 24 months before the sale (the more than 50% test). Throughout that time, more than half the value of the company's assets was used that way.
3. The 24 month ownership test. Throughout the 24 months before the sale, nobody other than you, a partnership you belong to, or a person related to you owned the shares.

You also need to be resident in Canada throughout the year of the sale. The CRA has a rule for people who are resident for part of that year and throughout the year before or after.

A simple worked example

These numbers are made up and rounded for illustration only. Your own result will differ.

Common traps

• Spare cash and investments in the company. This is the most common reason shares fail the tests. Moving them out, sometimes called purifying the company, takes planning and can have its own tax cost, and the 24 month test means it cannot be left to the last minute.
• Agreeing to an asset sale too quickly. Once the structure is in your letter of intent, it is hard to change. Know your after tax number for both options first.
• Recent changes in who owns the shares. New shareholders, holding companies or a family trust can affect the ownership test. Changes made close to a sale may not help.
• Assuming no tax at all. Gains above the limit, recapture inside the company before a sale, and the alternative minimum tax can all still apply.
• Past investment losses or claims. Certain earlier claims, such as allowable business investment losses or a cumulative net investment loss, can reduce what you can claim. Your accountant will check your history.

Getting paid over time

If part of the price is paid in later years, for example through vendor take-back financing, the reserve rules can sometimes spread the gain over several years. A reserve brought into income later can still qualify for the deduction, based on the year of the sale. Ask your accountant how a payment plan fits with your claim.

When to start planning

Ideally two years or more before you sell. That gives time to check whether your shares qualify, clean up the company's balance sheet if needed, and think about whether family members should own shares. Even if you plan to sell sooner, an early conversation helps you price the business, choose between a share and asset sale, and avoid surprises. Our guide to succession planning covers the wider timeline, and passing your business to family covers rules that apply to family sales.

Questions to take to your accountant

• Would my shares qualify today? If not, what would it take, and how long?
• How much of my lifetime exemption have I already used?
• What would I keep after tax in a share sale compared with an asset sale?
• Is there spare cash or investments in the company that could cause a problem?
• Could anyone else in my family claim their own exemption?
• Would the alternative minimum tax apply in the year I sell?

For the wider picture, read taxes when you sell a small business in Canada and what your lawyer and accountant do. This guide is general information, not tax advice for your situation.