Incorporating vs Sole Proprietor in Canada: The Tax Math That Decides It
By Jordan Ellis · Published · Reviewed
Quick Answer
A Canadian-controlled private corporation pays about 12-12.5% small-business tax on the first $500,000 of active income (Ontario; roughly 9-14% by province) versus personal marginal rates up to 53.5%. But that is only a deferral: you pay personal tax again when you take the money out as salary or dividends. Incorporation therefore pays off in three situations — you earn more than you spend and can invest the surplus inside the corp (deferring 30-40 points of tax for years), you need liability protection, or you sell the business and use the $1.25 million lifetime capital gains exemption. If you spend every dollar you earn, incorporation costs thousands a year in accounting and saves you nothing.
Every freelancer hits the same question around $80,000 of profit: incorporate or not? The answer is arithmetic, not vibes. Run your income through the income tax calculator first, then apply the three tests below.
The rate gap everyone quotes
| Sole proprietor | Corporation (small business rate, ON) | |
|---|---|---|
| Tax on first $500k of business income | Your marginal rate — up to 53.5% | ~12.2% |
| Tax to get the money into your hands | — | Personal tax on salary/dividends out |
| Annual admin cost | ~$0–500 | ~$2,000–4,000 (corporate return, bookkeeping) |
The 41-point gap is real — but it’s a deferral, not a discount. Integration means salary-and-dividends-out plus corporate tax roughly equals personal tax. The system only wins when money stays inside.
The three tests — incorporation pays if any is true
Test 1: The surplus test (the big one). You earn more than you spend. Leave $60,000/year inside the corp at 12% instead of 50%, invest it, and two decades of compounding on the deferred 38 points is worth hundreds of thousands. Spend everything you earn? Fail — stay a sole proprietor.
Test 2: The liability test. Clients who sue, employees, leases, product risk. The corp wall has holes (personal guarantees, director liability for payroll/HST remittances) but it’s real protection for everything else.
Test 3: The exit test. You’ll sell someday. Qualifying shares carry the lifetime capital gains exemption — roughly $1M+ tax-free per owner. Sole proprietorships get nothing like it. This alone justifies incorporating years before any sale.
What incorporation does NOT fix
- Income you spend. Full personal tax, plus accounting fees — you’re now behind.
- Income splitting dreams. TOSI rules killed most dividend sprinkling to low-income spouses/adult kids in 2018; the exceptions are narrow (spouses 65+, 20+ hrs/week workers).
- Your mortgage application. Lenders read corporation income messily — plan major borrowing before restructuring, or read the self-employed mortgage guide first.
- Passive income past $50k/year inside the corp grinds down the small business deduction — big corporate investment portfolios need design (holding companies, corporately owned insurance) with an accountant.
The bottom line
Under ~$60k profit with no liability concerns: sole proprietor, keep it simple, use the RRSP and TFSA shelters you already have. Above that with a genuine surplus: the deferral math turns decisively, and a $2,000 accountant pays for itself many times over. And if a sale is ever on the horizon, incorporate yesterday — the LCGE clock and qualification rules reward the early.
Official sources
Rules and dollar limits change. Confirm current amounts with the official pages below before you act · Last reviewed .
- Report business income and expenses (Form T2125) (Canada Revenue Agency)
- Tax rates and income brackets for the current year (Canada Revenue Agency)