How Are Bonuses Taxed in Canada?

A bonus is taxed at the same rates as ordinary employment income in Canada. There is no separate “bonus tax rate.” What feels different is the withholding: employers use the CRA bonus method, which projects your annual income with the bonus included, calculates the incremental tax, and withholds that amount. On large bonuses this often looks like 35-45% withholding, even though your actual marginal rate may be lower.

There is no special bonus tax rate

Canadian tax law does not distinguish a bonus from a regular salary payment. Both are employment income reported in box 14 of your T4. The combined federal and provincial marginal rate that applies depends on your total taxable income for the year, not on whether a particular dollar came from base salary or a bonus.

The CRA bonus method for withholding

Employers use one of three methods to calculate withholding on a bonus payment (CRA T4001 Employers’ Guide). The most common is the bonus method:

1. Take your year-to-date pay plus your expected remaining pay, and project annual income excluding the bonus.
2. Calculate annual tax on that amount.
3. Add the bonus to that annual income. Calculate annual tax on the new total.
4. The difference between (3) and (2) is the tax withheld on the bonus.

This is more accurate than treating the bonus as if it were a regular pay (which would over-withhold dramatically, because the system thinks you earn that bonus every pay period). But the result still depends on the employer’s estimate of your annual income and can leave you under- or over-withheld.

Why bonus withholding can look high

If your bonus is large compared to your salary, the bonus method correctly pushes you into a higher marginal bracket for the bonus dollars. A $20,000 bonus on top of an $80,000 Ontario salary lands those bonus dollars at roughly 31% combined marginal rate. Add CPP and EI withholding on the bonus pay slip and the total deduction can look closer to 35-40%.

Common scenarios where withholding feels excessive:

• Mid-year bonus larger than your usual paycheque. The bonus method works on annual income, so even a one-time bonus is taxed at your full-year marginal rate.
• Multiple bonuses in a short period. Each one stacks on top of the prior projection.
• Bonus in a year you also have RRSP room. Contributing the bonus to an RRSP within 60 days of year-end may produce a large refund.

CPP and EI on bonuses

CPP and EI apply to bonus payments at the same rates as regular pay (5.95% CPP, 1.63% EI outside Quebec), up to the annual maximums. If your year-to-date CPP and EI have already maxed out, no further deductions come off the bonus.

For high earners, this means bonuses paid late in the year often have no CPP or EI withheld — only income tax. For mid-year bonuses, the full 5.95% CPP and 1.63% EI typically apply.

Worked example: $20,000 bonus on $80,000 Ontario salary

Salary $80,000, mid-year bonus $20,000. Year-to-date deductions are not yet at the CPP/EI cap.

At tax time, the actual federal + Ontario marginal rate for the $20,000 of bonus dollars on top of $80,000 salary is roughly 29.65%. After-tax, the “real” bonus value is about $14,070. The difference between what was withheld ($5,845 of income tax) and what was owed (~$5,930) is small in this case — but on larger bonuses the gap can be hundreds or low thousands of dollars in either direction.

Reducing bonus tax with an RRSP contribution

The most common way to recapture bonus tax is to contribute part or all of the bonus to an RRSP within 60 days of year-end. The contribution reduces taxable income dollar for dollar, refunding tax at your marginal rate. For a $20,000 bonus contributed fully to an RRSP, the refund at a 30% marginal rate is roughly $6,000.

If you can ask your employer to send the bonus directly to your group RRSP, no tax is withheld at source — you get the full $20,000 into the RRSP immediately rather than $12,639 net plus a refund the following spring. CRA allows this via form T1213 or through a standing RRSP-deduction arrangement at payroll.

What to watch for

• Over-withholding. If your bonus pushes you into a higher tax bracket only for one year, you may get a refund.
• Under-withholding. If you have other income (investments, rental) the bonus method ignores, you may owe extra.
• OAS recovery tax. If you’re over 65 and receive OAS, a large bonus can push you over the clawback threshold for that year.
• Deferred bonus into the new year. If your bonus is paid in January for last year’s performance, it counts as this year’s income for tax purposes — not last year’s.