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. The 2026 federal brackets are:

Taxable income	Rate
$0 – $58,523	14%
$58,523 – $117,045	20.5%
$117,045 – $181,440	26%
$181,440 – $258,482	29%
Over $258,482	33%

Every taxpayer also gets a Basic Personal Amount (BPA) — for 2026, a non-refundable tax credit worth $16,452 at the lowest bracket's rate, not a deduction from income. (For high earners, the federal BPA phases out between $181,440 and $258,482 of taxable income, down to a floor of $14,829 — 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. Common deductible categories for a self-employed sole proprietor include home-office costs (a reasonable percentage of rent/mortgage interest, utilities, and internet based on business-use space), vehicle expenses (supported by a mileage log — see our mileage log requirements guide), professional fees, business insurance, and supplies. Keeping accurate expense records throughout the year, not just at tax time, directly lowers what both income tax and CPP/QPP are calculated on. You report this income and these expenses on Form T2125, Statement of Business or Professional Activities, filed alongside your regular T1 return.

A worked example

Say you're an Ontario sole proprietor with $75,000 in net self-employment income and no other income. Roughly:

1. CPP contributions come off first (both portions, since you have no employer) — see the CPP/QPP guide for the exact calculation — and half of the base CPP contribution is itself deductible from taxable income.
2. Federal tax applies the bracket table above to what's left, minus the BPA credit.
3. Ontario provincial tax applies Ontario's own brackets and BPA the same way.
4. Add federal tax, provincial tax, and your full CPP contribution together for your total tax bill.

Every one of those steps depends on the others (your CPP contribution changes your taxable income, which changes both tax lines), which is exactly why a small change in net income doesn't move your final number by an intuitive, round amount — the calculator below runs the actual math for any income level and province.

Filing deadline and quarterly instalments

Self-employed individuals (and their spouses or common-law partners) get an extended filing deadline of June 15 for the previous calendar year's return — but any balance owing is still due April 30, and interest starts accruing on that date even if you haven't filed yet. If your estimated net tax owing comes out above $3,000 ($1,800 in Quebec) in the current year and either of the two previous years, the CRA may require quarterly instalment payments rather than one lump sum at tax time — see our quarterly tax instalments guide for the specifics.

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.

Common mistakes to avoid

• Budgeting against gross revenue instead of net income. Setting aside tax money based on what you billed, before expenses, usually overestimates what you actually owe — but underestimating is the more expensive mistake, so when in doubt, set aside more.
• Forgetting CPP/QPP in your savings target. It's easy to plan for income tax and forget that, as a self-employed person, you're also on the hook for the employer's half of CPP/QPP.
• Missing the instalment threshold. Owing instalments and not paying them triggers interest charges even if you pay the full balance by the April 30 deadline.
• Mixing personal and business expenses in a way that makes your T2125 deductions hard to substantiate if the CRA asks for receipts.

Frequently asked questions

Do I need to register as a business to owe self-employment tax? No — if you earn self-employment income, you report and pay tax on it whether or not you've formally registered a business name or a GST/HST number. Registration questions are separate from the tax obligation itself.

Is the extended June 15 deadline automatic? Yes, for anyone who (or whose spouse/common-law partner) carried on a business in the tax year — no separate request is needed. Just remember the balance-owing deadline stays April 30 regardless.

Does incorporating change any of this? Yes, substantially — a corporation is taxed separately from you as an individual, at different rates, with different rules. This guide covers unincorporated sole proprietors only.

What if I have both self-employment income and a T4 job? Both get combined into your total taxable income for federal and provincial tax purposes; our tax estimator has a field for "other income already taxed" specifically for this case.

Official sources: CRA Guide T4002 – Self-employed Business, Professional, Commission, Farming, and Fishing Income · Canadian income tax rates for individuals · 2026 tax deadlines for Canadian businesses and self-employed individuals