Capital Gains Exemption When You Sell a Business in Canada
Selling the shares of a Canadian business can be the largest single transaction of an owner’s life, and Canada offers one of its most valuable tax breaks for exactly that moment: the lifetime capital gains exemption. It can shelter over a million dollars of gain. It also has two twenty-four-month tests that decide whether you get it — and by the time you have an offer on the table, it is often too late to fix them.
The lifetime capital gains exemption (LCGE) lets you shelter capital gains on qualified small business corporation shares or qualified farm or fishing property. For 2025 the LCGE is $1,250,000 of gain, claimed as a deduction of up to $625,000 (half the gain, matching the 50% inclusion rate) on line 25400. It is a lifetime total, not annual, and it is indexed to inflation. It does not apply to a sole proprietorship, rental property, or ordinary stock market shares.
| Lifetime capital gains exemption | The rule |
|---|---|
| Exemption amount (2025) | $1,250,000 of capital gain, indexed to inflation |
| Maximum deduction | $625,000 (50% of the exemption) |
| Where you claim it | Line 25400 of your T1 return |
| Qualifying property | QSBCS, and qualified farm or fishing property |
| Does NOT qualify | Sole proprietorship assets, rental property, publicly traded shares, crypto |
| Lifetime or annual? | Lifetime cumulative — once used, it is gone |
| Residency | Resident of Canada throughout the year |
| Forms | T657, plus T936 if you have ever had investment income or expenses |
Source: Canada Revenue Agency, Line 25400 – Capital gains deduction. Amount shown is the 2025 figure; the limit is indexed annually, so confirm the current year before relying on it.
What the exemption is worth
The mechanics confuse people because of the word “exemption.” In Canada the LCGE is delivered as a deduction against the taxable half of your gain. Since only 50% of a capital gain is taxable, a $1,250,000 exemption produces a maximum deduction of $625,000.
Take an owner who sells qualifying shares for a $2,000,000 capital gain, at a 45% marginal rate:
| Without the LCGE | With the full LCGE | |
|---|---|---|
| Taxable capital gain (50%) | $1,000,000 | $1,000,000 |
| Capital gains deduction (line 25400) | $0 | −$625,000 |
| Net taxable amount | $1,000,000 | $375,000 |
| Tax at a 45% marginal rate | $450,000 | $168,750 |
A saving of roughly $281,250 from one deduction. If the entire gain had been $1,250,000 or less and fully qualified, the deduction would have covered all of it and the federal and provincial tax on the sale could have been nil. Your marginal tax rate determines the actual saving, and you can model the underlying gain with our capital gains tax calculator.
Two features are worth stating plainly. It is a lifetime limit: amounts claimed in earlier years reduce what remains. And you may claim any amount up to your maximum in a given year, which occasionally matters for planning across multiple transactions.
What property actually qualifies
This is where most Canadian business owners discover the exemption does not apply to them. Only two categories qualify: qualified small business corporation shares and qualified farm or fishing property (plus reserves and certain trust allocations relating to either).
The consequence catches sole proprietors hardest. If you run your business unincorporated and sell its assets — the client list, the equipment, the goodwill — you are not selling shares of a corporation, so the LCGE is not available. The exemption attaches to shares, not to businesses in general.
An asset sale by an incorporated business has the same problem: the corporation sells the assets and the gain lands inside the company, not on shares you personally disposed of. Buyers often prefer asset deals for their own tax reasons, which is precisely why the share-versus-asset question is negotiated, not assumed.
The two 24-month tests that decide everything
For shares to be qualified small business corporation shares, the CRA requires all of the following to be met.
- At the time of sale, the share was a share of the capital stock of a small business corporation, owned by you, your spouse or common-law partner, or a partnership you were a member of.
- The holding-period test. Throughout the 24 months immediately before the disposition, no one owned the share other than you, a partnership of which you were a member, or a person related to you.
- The asset test. Throughout that part of the 24 months while the share was owned by you, your partnership, or a related person, it was a share of a Canadian-controlled private corporation, and more than 50% of the fair market value of the corporation’s assets were used mainly in an active business carried on primarily in Canada by that corporation or a related one, or were certain shares or debts of connected corporations, or a combination of the two.
The asset test is where profitable Canadian companies fail. Retained cash, investment portfolios, and surplus real estate are not active business assets. A corporation that has quietly accumulated a large investment account can breach the 50% threshold, and because the test runs across the full 24 months before the sale, cleaning it up the week before closing does not fix the prior two years. Advisers call the remedy “purification”, and it is planning that has to start years ahead. If your company holds significant passive assets, this is the single most important conversation to have with a tax professional.
The CNIL: the deduction you may have already spent
A second, quieter reducer catches investors. Your cumulative net investment loss — the running total by which your investment expenses have exceeded your investment income since 1988 — grinds down the capital gains deduction you can claim. Interest on money borrowed to invest is the usual culprit.
This is why the CRA requires Form T936 alongside Form T657 if you have had investment income or expenses in any year from 1988 onward. Owners who have carried investment loans for years can find their available deduction materially smaller than the headline figure, and they generally find out at filing time rather than at negotiation time.
See the taxable portion and tax by province, then subtract the deduction you expect to qualify for.
Getting the number right
The exemption applies to the gain, so the gain has to be calculated correctly first. That means knowing your adjusted cost base in the shares — what you paid on incorporation or acquisition, plus any subsequent capital contributions — and deducting the legal, accounting, and advisory costs of the sale as outlays and expenses.
Two adjacent rules come up often in the same transaction. If part of the sale price is paid over several years, a capital gains reserve can spread the gain, and reserves brought into income later remain eligible for the deduction based on the year of the original disposition. And if you have unused net capital losses, remember they and the exemption both reduce the same taxable gain — our guide to capital loss carryforward explains how those balances work.
Transferring shares to family members, or to a holding company, before a sale is also a disposition in its own right and can itself be deemed to happen at fair market value — see deemed disposition in Canada. Family arrangements intended to use more than one person’s exemption are legitimate but technical, and are not something to improvise.
What to do, and when
The pattern across every failed claim is the same: the tests are historical, so the work has to happen before the sale, not during it.
- Two years out — review the asset mix against the 50% active-business test and address passive assets while there is still time for the 24-month window to run clean.
- Check your CNIL balance before you assume the full deduction is available.
- Confirm the current year’s limit. The exemption is indexed annually, so the figure that applies is the one for the year of your disposition.
- Get professional advice on structure. Share sale versus asset sale, purification, family arrangements, the alternative minimum tax, and the reserve rules interact in ways that turn on details specific to your company.
The CRA’s own material is on its capital gains deduction page and in Guide T4037, Capital Gains. For the rest of the toolkit, see our free financial calculators.
Frequently asked questions
For 2025 the lifetime capital gains exemption is $1,250,000 of capital gain on qualifying property, which produces a maximum capital gains deduction of $625,000 because only half of a capital gain is taxable. The limit is indexed to inflation, so confirm the figure for the year of your sale.
No. The exemption applies to qualified small business corporation shares and to qualified farm or fishing property. An unincorporated business selling its assets is not disposing of shares, so the LCGE is not available on that sale.
Three conditions must all be met: at the time of sale the share was of a small business corporation owned by you, your spouse or common-law partner, or your partnership; throughout the 24 months before the sale nobody other than you, your partnership, or a related person owned it; and throughout that period it was a share of a Canadian-controlled private corporation with more than 50% of the fair market value of its assets used mainly in an active business carried on primarily in Canada.
Yes. Cash, investment portfolios, and surplus real estate are generally not active business assets, so a company holding a large amount of them can fail the requirement that more than 50% of asset value be used in an active business. Because the test looks back 24 months, correcting it shortly before a sale does not help.
It is a lifetime cumulative limit. Amounts you claimed in previous years reduce what remains available, and you can claim any amount up to your maximum in a given year rather than being forced to use it all at once.
Form T657, Calculation of Capital Gains Deduction, and the deduction is claimed on line 25400 of your return. If you had investment income or investment expenses in any year from 1988 onward you must also complete Form T936 to calculate your cumulative net investment loss, which can reduce the deduction available.
Last updated: August 2026. Exemption amount is the CRA’s 2025 figure and is indexed annually — verify the limit for your year of sale.
This article is general information, not tax or legal advice. The lifetime capital gains exemption depends on detailed corporate and share conditions, and matters such as purification, family arrangements, capital gains reserves, and the alternative minimum tax can change the outcome materially. The exemption amount is indexed and subject to legislative change. Confirm current rules with the Canada Revenue Agency and work with a qualified tax professional well before a sale.
