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Stock options are taxed as employment income, and the tax usually hits in the year you buy the shares, not when you receive the options. The taxable benefit is the market value of the shares on the day you exercise, minus what you paid. Many employees can then deduct half of it.
How are stock options taxed in Canada?
The CRA treats a stock option as a right to buy shares at a set price. When the shares are worth more than that price, the gap counts as a benefit from your job. That gap is the stock option benefit. It equals the fair market value of the share when you buy it, less the price you paid for it, less anything you paid to get the option in the first place.
Receiving an option (a “grant”) doesn’t trigger tax. Nor does waiting while it vests. Tax starts when you exercise, when you transfer the option for a gain, or when you die holding it.
When is the tax due, and who deducts what?
Your employer’s status decides it. The rules differ for a Canadian-controlled private corporation (a CCPC, which most start-ups are) and for anyone else. The CRA’s page on employee security options says the benefit is taxed in the year the employee disposes of the shares for a CCPC, and in the year the employee acquires them otherwise.
| CCPC employer | Other employers | |
|---|---|---|
| Year the benefit is taxed | Year you sell the shares | Year you acquire the shares |
| Half deduction | Yes, if conditions are met | Yes, if conditions are met |
| Withholding on a share purchase | None | Income tax and CPP, not EI |
| Withholding on a cash-out | Income tax, CPP and EI | Income tax, CPP and EI |
The deduction is worth chasing. It halves the taxable amount, so the benefit is taxed much like a capital gain. To qualify, you must deal at arm’s length with your employer, and the price you pay can’t be below the share’s market value on the day the option was granted. For options granted after 1 July 2021 by large non-CCPC employers (revenues over $500 million), there’s also a $200,000 yearly vesting limit. Options above it don’t get the deduction, and your employer has to tell you within 30 days.
A cash-out has its own wrinkle. If you give up your rights and take cash instead of shares, the CRA page says the deduction is available only when the employer elects not to claim the cash-out as an expense. Ask HR which way your company goes before you choose cash over shares.
What does it cost you? A worked example
Say you earn $90,000 in Ontario and hold 1,000 options with a $10 strike. You exercise when the shares trade at $30. The benefit is $20,000. Here’s what it does to your 2026 income tax, using our income tax calculator.
| Case | Extra income counted | Income tax | Extra tax |
|---|---|---|---|
| Salary only | $0 | $17,033.55 | $0 |
| Half deduction allowed | $10,000 | $20,024.35 | $2,990.80 |
| No deduction | $20,000 | $23,198.59 | $6,165.04 |
So the deduction saves $3,174.24 here. It also shows why the conditions matter. Your salary already sits above the CPP and EI maximums, so the extra tax is all income tax in this example.
Now the cash problem. You’d spend $10,000 to buy the shares and owe roughly $3,000 of tax on paper gains. If you’re at a non-CCPC, that tax lands in the same year, even if you keep the shares. Have the cash ready, or plan to sell some shares. Jordan in Vancouver learned this the hard way: the shares looked like a windfall in March and felt like a mortgage payment by April.
What happens when you sell the shares?
Buying and selling are two events. The benefit is taxed when it’s triggered, and any later rise or fall in the share price is a separate matter of capital gains or losses. Our capital gains tax calculator shows that side. It taxes half of a gain, and that inclusion rate is worth confirming on the CRA site for the year you sell, since it has been a topic of policy debate.
If the shares fall after you exercise, you can end up paying tax on a benefit that’s worth less by the time you sell. It’s the classic stock option regret. An RRSP deduction can soften a big year, and the RRSP calculator shows how much.
Mistakes to avoid
- Assuming grant day is tax day. It isn’t.
- Forgetting to claim the deduction. It goes on line 24900 of your return, using the amounts your T4 shows.
- Ignoring the tax bill when exercising a large batch, which can push you into a higher bracket for the year.
- Not checking if your employer counts as a CCPC. It changes the timing completely.
To see what a jump in income does to your net pay before you exercise, try the take-home pay calculator.
What should you pull together before you exercise?
Gather the option agreement, the vesting schedule, the grant date and the strike price. Ask your employer whether it’s a CCPC, what the share is worth on the day you plan to exercise, and how tax will be withheld. Then run the numbers for your own year, not a friend’s. A twenty-minute check beforehand is cheap next to a surprise bill at tax time.
Where the numbers come from
The rules are from the Canada Revenue Agency‘s pages on employee security options and on line 24900. The tax figures use the 2026 federal and Ontario rates in our calculators. Your own figures come from your option agreement, so read it for the strike price, vesting dates and any cash-out terms.
Frequently asked questions
When are stock options taxed in Canada?
For most employers, in the year you acquire the shares. At a CCPC the benefit is taxed in the year you sell them.
How is the stock option benefit calculated?
It's the market value of the share when you buy it, minus what you paid for the share, minus anything you paid for the option.
What is the stock option deduction?
Half of the benefit can be deducted if you deal at arm's length with the employer and the strike price wasn't below the market value at grant.
Is there tax when options are granted or vest?
No. Tax starts when you exercise, transfer the option for a gain or die holding it.
Does my employer withhold tax when I exercise?
Non-CCPC employers withhold income tax and CPP on a share purchase, not EI. A CCPC withholds nothing on a share purchase.
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