Commission Income Tax Calculator Canada

What the commission income tax calculator does

The calculator estimates take-home pay for a Canadian employee paid partly or wholly on commission, including the rule that makes commission pay different from salary: the sales expense deduction and its cap. It reports gross income, the expenses actually deductible, taxable income, federal and provincial tax, payroll contributions, the tax the expense claim saved, the marginal rate on the next commission dollar, and what the commission is worth once everything is taken off.

Commission pay is ordinary employment income, with no separate rate schedule. What differs is the deduction available against it, and the fact that the money arrives unevenly across the year.

The T777 expense deduction and its cap

An employee paid by commission may deduct the reasonable costs of earning it: promotion, entertainment within limits, travel, vehicle running costs for work use, parking, licences, and a share of home-office costs where the conditions are met. The employer certifies the terms of employment on form T2200, and the claim goes on form T777 with the return.

The deduction cannot exceed the commission earned in the year. Claim $25,000 of selling expenses against $20,000 of commission and only $20,000 is deductible; the other $5,000 cannot be applied against base salary or carried forward. Capital cost allowance and interest on a vehicle used for work are claimed under a separate rule that is not limited in this way.

The calculator enforces the cap and shows both what you claimed and what was allowed. If they differ, the spending deserves a second look.

How the tax is worked out

Base salary plus commission is gross employment income. Allowed expenses come off, then any RRSP contribution, other deductions and the deduction for enhanced CPP contributions, leaving taxable income.

Federal tax applies the federal brackets and then subtracts the basic personal amount valued at the lowest federal rate, because Canadian personal amounts are non-refundable credits rather than a tax-free band. Quebec residents get the federal abatement, a reduction of basic federal tax because the province collects its own income tax.

Provincial tax follows the same pattern with the province’s brackets and basic personal amount. Ontario then adds its surtax, a tax on the provincial tax itself, which the calculator applies from the surtax table.

Brackets, personal amounts, surtax thresholds and rates come from the parameter set and are indexed each year.

A worked example

With the default inputs ($40,000 base salary plus $60,000 commission in Ontario, $8,000 of selling expenses), gross income is $100,000 and taxable income about $90,873. Federal tax is about $11,662 and Ontario tax about $5,965. Payroll contributions come to about $5,770. After tax and payroll deductions you keep about $76,604, or $68,604 after the $8,000 spent on selling. The expense claim saved about $2,398 of tax, the marginal rate on the next commission dollar is 29.65%, and the commission itself is worth about $35,790 after everything.

Payroll contributions on gross pay

CPP and EI are assessed on gross employment earnings, not on income after expenses, so a large expense claim reduces income tax without touching payroll deductions.

Contributions are capped. Base CPP stops at the year’s maximum pensionable earnings, the second tier (CPP2) at a higher ceiling, and EI at maximum insurable earnings. In a strong commission year, payroll deductions stop partway through, which is why the effective deduction rate on a very high income can be lower than expected.

In Quebec, QPP replaces CPP at its own higher rate and the Quebec Parental Insurance Plan premium applies on top. Selecting Quebec switches those on.

What the commission is actually worth

The last line in the results is often the most useful. It takes your take-home with the commission, subtracts what you would have taken home on base salary alone, and reports the difference after tax, payroll contributions and the cash spent on selling.

That figure is what an extra selling season really delivers. Where expenses are high and the marginal rate is steep, it can be much less than the headline commission, and occasionally negative, which is where the expense cap bites.

The marginal rate output is the combined federal and provincial rate on the next $100 of commission, the number to keep in mind before deciding whether a marginal deal is worth chasing.

Using the result well

Enter the commission received in the calendar year, not the amount booked or invoiced, since employment income is taxed when received. Enter expenses at the amount you can support with receipts and a signed T2200; the deduction is a common audit target, and an uncertified claim will not survive review.

If your employer withholds at a flat rate on commission cheques, compare the total deductions here with what has already been taken off. Commission earners often end the year with a refund or a balance owing because periodic withholding cannot see the full year, and it helps to know which is coming.

These figures are a planning estimate, not tax advice. Your actual assessment depends on credits, other income and deductions this calculator does not model, so confirm anything material with a professional or against your notice of assessment.

About This Tool: Commission Income Tax

Commission income tax: use this tool to get an instant, accurate estimate. The figures follow official CRA guidance and every rate and threshold is kept up to date for 2026. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.