Bonus Tax in Canada: Why Your Bonus Looks Over-Taxed
The hub is the tax-aware income guide. What the salary alone costs, before the bonus, is salary after tax by province. Room to put part of a bonus into an RRSP is the RRSP playbook and the limits table. A lump sum that is really severance is a retiring allowance, and the withholding rules are different.
- CRA's payroll page says to report the bonus on the T4 in the year it is received, and to withhold income tax using the bonus method.
- CPP and EI apply to a bonus. They do not apply to a retiring allowance.
- T4127's 2026 formulas describe the tax as annual tax with the payment, minus annual tax without it. If that annual taxable-income result is $5,000 or less, the formula says withhold 15% federally, or 10% in Quebec.
- That 15% line is not "every bonus under $5,000." It is a test on the annual figure in the formula.
- An RRSP deduction reduces tax on the return only if you have room and you contribute. It does not automatically change the stub.
Why does the percentage on the stub look higher than your average rate?
Payroll does not spread a bonus back over the year and tax it at your average rate. The bonus method, in the 122nd edition of T4127, effective January 1, 2026, taxes the bonus as the difference between two annual tax figures. One includes the bonus. One does not. The difference is withheld from the bonus. If your salary already fills the lower brackets, that difference is calculated at the brackets the extra dollars fall into. Your average rate on the whole year is lower. Both numbers can be right. They are answering different questions.
CRA's plain-language page says the same thing in one sentence: calculate using the bonus or irregular-payments method, withhold CPP using that method, withhold EI, and report the payment on the T4 for the year received. A qualifying retroactive lump-sum payment can be eligible for a special calculation when the employee files. A normal annual bonus is not that special calculation.
Using only the basic personal amount and the 2026 brackets, income tax on $90,000 is lower than income tax on $100,000 by about $3,058. That gap is 30.6% of the $10,000. It is an illustration of the difference method, on the same worksheet as the province table. A real employer also withholds CPP and EI if those ceilings are not already maxed, and uses the TD1 claim code and the T4127 factors, not this worksheet. If the stub shows a different dollar, the stub is following the payroll formula. The T1 is where the year gets reconciled.
When does the flat 15% withholding apply?
T4127 says that if the annual taxable-income result in the bonus formula is $5,000 or less, deduct 15% tax from the bonus, or 10% in Quebec. Read that as a test on the formula's annual figure, not as a rule that every bonus of $5,000 or less is taxed at 15% forever. Someone who earns a normal salary will not be in that $5,000 annual-income case. Their bonus is withheld with the difference method. Quebec's 10% in that sentence is the federal instruction inside the payroll formula. Revenu Québec has its own provincial withholding.
Can you point the bonus at an RRSP?
On the return, a deductible RRSP contribution reduces taxable income. The 2026 RRSP dollar limit is $33,810. Your personal room is on your CRA account and is also limited by a percentage of last year's earned income and by any pension adjustment. A bonus paid in 2026 is earned income for a later year's room. It does not create room on the morning it is paid.
Whether the employer withholds less because the bonus is transferred directly to an RRSP depends on the employer's payroll practice and on whether you can actually deduct the contribution. Do not assume a verbal "send it to my RRSP" changes the T4. If the transfer is not direct, you receive the cash net of withholding and you contribute yourself. Any extra withholding comes back when you file, if the deduction is allowed. The contribution has to land in time: during the year, or in the first 60 days of the next year, for a deduction on this year's return. Confirm the deadline on the CRA page for the year. This article is not that calendar.
Both are employment income. Both can become part of the earned-income base that creates next year's RRSP room, up to the dollar limit. A raise also raises every future stub. A bonus might not repeat. Negotiate them separately. The comparison of staying versus leaving is raise math. Equity that arrives in the same year is RSU and stock-option tax, and it can stack into the same brackets as the bonus.
What should you check before you spend the deposit?
- Is it a bonus or a retiring allowance? Loss of employment is the severance article. CPP and EI treatment flips.
- Have you already maxed CPP and EI? A bonus late in the year may have little CPP left to withhold. A bonus in January might withhold both.
- What province will you reside in on December 31? Withholding may use the province of employment. Tax on the return uses residence. They can differ. The salary table is residence.
- Will the bonus push income across a benefit clawback? That is not extra withholding. It is benefits stacking.
Frequently asked questions
Is my bonus taxed at 30% or 40%?
Only the slice that falls in a bracket with that combined rate, and only after federal and provincial rates are added for your province. Withholding can look like a flat high percentage because it is computed on the margin. It is not a separate bonus tax. File the return. If withholding exceeded the tax on your actual income, the difference is a refund, not a gift.
Does the bonus go on a T4A?
CRA's page on bonuses says to report it as employment income on the T4 in the year received. A retiring allowance is often the payment that shows up on a T4A. If your slip does not match what the payment was, ask the payroll department before you invent a line on the return.
Will I pay CPP twice?
CPP is owed on pensionable earnings up to the year's ceilings, across employers in combination. The 2026 YMPE is $74,600 and the YAMPE is $85,000. A bonus counts. If two employers both withhold the maximum, the excess employee contribution is reconciled on the return. Do not ignore it.
Can I refuse the bonus and take salary instead?
You can negotiate the mix before it is paid. Once it is paid as a bonus, it is received. Splitting it into salary over a later year is a different contract, not a recharacterization you do on the T1. The tax outcome of a higher salary is the province table, run at the new number.
What if the bonus is paid in January for last year's work?
CRA says the T4 year is the year you receive it. A January payment is next year's income, even if the work was done in December. That also means it lands in next year's brackets, which may be an advantage or not, depending on what else you will earn. It is not a choice you make by the label on the memo.
Sources
- CRA: bonuses, retroactive pay, and irregular amounts
- CRA: T4127 bonus formulas, 2026 edition
- CRA: special payments chart
- CRA: 2026 RRSP dollar limit
The stub is withholding. The return is the tax.
Brackets and RRSP room decide whether the bonus was expensive. The 2026 tax guide is that reconciliation.
Get the 2026 Tax Guide — $49 CAD
