How Bonus Tax Works in Canada

Getting a bonus at work is exciting — until you see how much tax was deducted. Many Canadians are surprised by the size of the withholding on a one-time payment. Understanding how the Canada Revenue Agency (CRA) treats bonuses can help you plan better and avoid sticker shock.

How the CRA Treats Bonuses

The CRA classifies bonuses as lump-sum payments, not regular employment income. This distinction matters because it changes how your employer calculates the tax to withhold.

There are two methods your employer can use:

1. The Lump-Sum Method

Under this approach, your employer withholds a flat percentage from the bonus based on its size:

• 10% on amounts up to $5,000
• 20% on amounts from $5,001 to $15,000
• 30% on amounts over $15,000

This is the simpler method and is commonly used for one-off payments. However, the flat rate may not match your actual marginal tax rate, which means you could owe more (or get a refund) at tax time.

2. The Periodic (Incremental) Method

This method is more accurate. Your employer calculates the total income tax on your salary plus the bonus, then subtracts the tax on your salary alone. The difference is the tax withheld on the bonus.

For example, if your salary is $60,000 and your bonus is $10,000:

• Tax on $70,000 = $X
• Tax on $60,000 = $Y
• Tax withheld on bonus = $X - $Y

This approach better reflects your actual marginal rate and is the method used by most payroll software in Canada.

CPP on Bonuses

Canada Pension Plan contributions apply to bonus payments just like regular income. In 2025, the employee CPP rate is 5.95% on pensionable earnings between the basic exemption ($3,500) and the Year’s Maximum Pensionable Earnings (YMPE) of $71,300.

If your salary alone has not reached the YMPE, CPP will be deducted from your bonus on the remaining pensionable amount. Once you hit the YMPE, CPP1 contributions stop — but CPP2 (enhanced) may still apply on earnings up to the second ceiling of $81,200 at a rate of 4%.

If your salary already exceeds the YMPE, no additional CPP1 will be deducted from the bonus, though CPP2 may still apply.

EI on Bonuses

Employment Insurance premiums are deducted on bonuses up to the maximum insurable earnings ($65,700 in 2025). The standard EI rate is 1.64%. Quebec residents pay a lower rate of 1.32% because they contribute to the Quebec Parental Insurance Plan (QPIP) separately.

If your salary has already exceeded the EI maximum, no further EI premiums are withheld from the bonus.

Why Bonuses Seem Heavily Taxed

Bonuses are not actually taxed at a higher rate than regular income. They are taxed at your marginal rate, which is the rate on your next dollar of income. Since bonuses are added on top of your salary, they often land in a higher tax bracket.

For someone earning $100,000 in Ontario, a $10,000 bonus would face a combined federal and provincial marginal rate of roughly 43%. That is significantly higher than the effective rate on their salary, which creates the impression of unfair taxation.

At tax time, everything gets reconciled. If too much was withheld, you receive a refund. If too little was withheld, you owe the difference.

Strategies to Reduce Bonus Tax

1. RRSP contribution: Contribute your bonus directly to your RRSP (or contribute after and claim the deduction). This reduces your taxable income and may generate a refund.
2. Ask for timing flexibility: If possible, defer the bonus to a year when your income will be lower.
3. Charitable donations: Large donations generate non-refundable tax credits that offset income tax.
4. Review your TD1 form: Ensure your personal tax credit claims are accurate so withholding matches your actual situation.

Bottom Line

Bonus tax in Canada follows the same progressive rules as regular income — it just hits at your marginal rate. Use our Bonus Tax Calculator to see exactly how much you will take home after federal tax, provincial tax, CPP, and EI.