How Self-Employment Tax Works in Canada

No separate "self-employment tax" — but two things stack

Unlike some countries, Canada doesn't have a distinct "self-employment tax." What you owe is your regular federal and provincial income tax on your net business income, plus CPP (or QPP in Quebec) contributions — and because you have no employer, you pay both the employee and employer share of those contributions yourself. See our CPP/QPP for self-employed guide for exactly how that's calculated.

How income tax is calculated

Federal and provincial income tax both use progressive brackets — you pay a low rate on the first slice of income, then higher rates on each slice above it, not one flat rate on everything. Every taxpayer also gets a Basic Personal Amount (BPA): a non-refundable tax credit, not a deduction, applied at the lowest bracket's rate. (For high earners, the federal BPA phases out above $181,440 of taxable income — most self-employed people never reach this band.)

Provincial tax is calculated the same way, using that province's own brackets and its own BPA, and added on top of federal tax. Quebec residents get one additional adjustment: a federal abatement that reduces basic federal tax by 16.5%, since Quebec collects its own provincial income tax independently of the other provinces' arrangement with the federal government.

Net business income, not gross revenue

Tax applies to your net income — revenue minus deductible business expenses — not what you billed. Keeping accurate expense records throughout the year (not just at tax time) directly lowers what both income tax and CPP/QPP are calculated on.

Because federal tax, provincial tax, and CPP/QPP contributions all depend on each other (your CPP/QPP contribution is itself partly deductible from taxable income), estimating your total tax bill by hand means tracking several moving numbers at once — a calculator that applies the current year's actual brackets and rates removes that manual work.