Bonus Tax Calculator

A bonus is ordinary employment income. Unlike regular pay, which is taxed each pay period on its annualised amount, a bonus gets its own withholding calculation: your pay with the bonus spread over the year is compared with your pay without it, and the difference in tax for the year is withheld from the bonus. This means the bonus is effectively taxed at your marginal rate — there is no special “bonus tax” in Canada.

Employer withholding: The CRA requires employers to withhold income tax on bonuses using the CRA bonus method (Guide T4001) — divide the bonus by the year’s pay periods, add it to regular pay, and multiply the extra tax per period by the number of periods. When your total pay for the year, bonus included, is $5,000 or less, a flat 15% (10% in Quebec) is withheld instead. Because the method cannot see credits like RRSP contributions you make yourself, it can still over- or under-withhold relative to what you actually owe. Any difference is reconciled when you file your T1 return.

CPP contributions: Canada Pension Plan contributions are deducted from your bonus if you have not reached the Year’s Maximum Pensionable Earnings (YMPE) of $74,600 for 2026. The employee rate is 5.95% on pensionable earnings above the $3,500 basic exemption. If your total earnings exceed the YMPE, CPP2 (enhanced) contributions apply at 4% on the portion between $74,600 and $85,000.

EI premiums: Employment Insurance premiums apply to the bonus up to the maximum insurable earnings of $68,900 for 2026. The employee rate is 1.63% outside Quebec. Quebec residents pay a lower EI rate of 1.30% because they contribute to the Quebec Parental Insurance Plan (QPIP) separately, which covers parental and maternity benefits instead of EI.

Why withholding may differ from actual tax: The tax withheld on your bonus may not match what you actually owe. Your employer bases withholding on your year-to-date income and projected annual income, but cannot account for all credits, deductions (such as RRSP contributions), or other income sources. When you file your return, the CRA calculates your actual tax liability on total income, and any overpayment is refunded.

Scenario: You earn $80,000 per year in Ontario and receive a $10,000 bonus. You want to know how much of that bonus you will actually take home.

Step 1 — Federal tax on bonus: On $80,000 salary alone, federal tax is 14% on the first $58,523 = $8,193, plus 20.5% on $21,477 ($80,000 − $58,523) = $4,403. Total federal tax on salary: $12,596. On $90,000 (salary + bonus), federal tax is $8,193 + 20.5% on $31,477 = $14,646. Federal tax on the bonus: $14,646 − $12,596 = $2,050.

Step 2 — Ontario provincial tax on bonus: Ontario taxes $80,000 at 5.05% on the first $53,891 = $2,721, plus 9.15% on $26,109 = $2,389. Total provincial tax on salary: $5,110. On $90,000: $2,721 + 9.15% on $36,109 = $6,025. Provincial tax on the bonus: $6,025 − $5,110 = $915.

Step 3 — CPP on bonus: The YMPE for 2026 is $74,600. At $80,000 salary, you have already maxed out CPP1 contributions. However, CPP2 applies at 4% on earnings between $74,600 and $85,000. Your bonus pushes total earnings from $80,000 to $85,000 (capped), so CPP2 on the bonus is 4% × $5,000 = $200.

Step 4 — EI on bonus: The maximum insurable earnings for 2026 is $68,900. At $80,000 salary, you have already reached the EI cap, so no additional EI is deducted from the bonus: $0.

Total deductions on bonus: $2,050 + $915 + $200 + $0 = $3,165.
Net bonus: $10,000 − $3,165 = $6,835. Your effective tax rate on the bonus is approximately 31.7%.

Note: This example uses gross bracket calculations before BPA credits for clarity. The calculator applies all credits and produces precise results.