Ontario Bonus Tax Calculator

How Are Bonuses Taxed in Ontario?

In Ontario, a bonus is treated as taxable employment income — just like your regular salary. When your employer pays you a lump sum bonus, they are required to withhold federal income tax, Ontario provincial tax, CPP contributions, and EI premiums before the money reaches your bank account.

The reason bonus withholding often feels higher than your regular pay is that employers must estimate the tax on your bonus using CRA payroll withholding methods. Under the CRA T4032 annualization method, your employer combines the bonus with your regular pay, projects that total over the full year, and applies the resulting marginal tax rate to the entire bonus in one pay period. This stacking of federal tax, Ontario tax, CPP, and EI is why a $10,000 bonus might deposit only around $6,300.

Importantly, this withholding is a prepayment — not your final tax bill. When you file your T1 return, your actual tax is calculated on total annual income after credits and deductions. If your employer withheld more than you owe, the CRA refunds the difference. This calculator estimates withholding only — it does not calculate your final tax owed.

CPP and EI on bonuses are also subject to annual maximums — if your year-to-date salary already exceeds those ceilings, no further deductions apply to the bonus.

Source: CRA T4032-ON Payroll Deductions Tables (2026)

Bonus After Tax Calculator

Many employees search for a bonus after tax calculator because they want to know what will actually land in their account after the CRA and Ontario take their share. The calculator above gives you that answer — enter your annual salary, bonus amount, and pay frequency, and it estimates your net bonus after federal and Ontario withholding, CPP, and EI.

A bonus after tax result is different from your marginal tax rate. Your marginal rate is the rate on your next dollar of income, while the effective withholding rate on your bonus depends on how your employer annualizes your pay. The calculator shows both rates so you can understand the difference.

Keep in mind that this is an employer withholding estimate. Your actual tax result depends on your full-year income, deductions, and credits when you file your T1 return.

Bonus Tax Rate in Ontario

There is no single flat Ontario bonus tax rate that applies to everyone. The bonus tax Ontario withholding rate depends on your annual base salary, the bonus amount itself, your CPP and EI year-to-date contributions, and your pay frequency.

For a typical Ontario employee earning $85,000 with a $10,000 bi-weekly bonus in 2026, the combined effective withholding rate is roughly 37% — covering federal tax, Ontario tax (including the Ontario surtax), CPP contributions, and EI premiums. A higher-income earner may see effective withholding above 40%, while someone earning less could see a lower rate.

The Ontario tax brackets, Ontario surtax, federal tax brackets, CPP/CPP2 contribution rates, and EI premium rates all factor into the final number. Use this tool as your bonus tax rate Ontario calculator to get a realistic withholding estimate for your specific situation.

Example — $85,000 Salary + $10,000 Bonus

Ontario employee, bi-weekly payroll, tax year 2026, no RRSP deduction on TD1.

Method & Limitations

This bonus tax calculator Ontario uses the CRA T4032-ON bonus method (annualization) with 2026 federal and Ontario rates, CPP/CPP2, EI, and Ontario surtax logic.

Primary references include CRA payroll deduction tables, CRA federal tax rates, CPP contribution limits, and the 2026 EI premium announcement.

• Estimates employer withholding only — not your final T1 tax liability
• Ontario employment income only
• Complex TD1/TD1ON claim codes or non-resident situations may differ
• Multiple jobs or income sources are not modelled
• Lump sum bonus payments only — does not cover stock options or deferred compensation