Run the ROI before you run the paperwork
The financial case rests on one mechanism. Profit retained in a Canadian-controlled private corporation is taxed at about 12.2% in Ontario on the first $500,000, while the same dollar paid straight through to you lands at your personal rate. Integration keeps flow-through dollars roughly neutral, so the corporation earns its keep only on the dollars you can afford to leave behind. A contractor who needs every dollar they bill gets a T2, a minute book and an annual accounting bill in exchange for very little.
Tax is not the only column. Most staffing agencies and many end clients will only contract with a corporation, which makes incorporating the price of admission rather than a choice. A corporation also separates commercial obligations, the equipment financing and the contract dispute, from your house, though errors-and-omissions insurance still does the professional heavy lifting.
| Your situation | What incorporation is worth |
|---|---|
| You can retain profit most years | The full deferral, about 41 cents on every retained dollar |
| You spend everything you bill | Little on tax; the compliance cost stands either way |
| The agency requires a corporation | The ticket to the contract; run the PSB check below first |
| One long-term client, employee in all but name | PSB risk can erase the rate advantage entirely |
| Building a product or a firm you might sell | The right container from day one, for IP and a future share sale |
The PSB question, answered before the articles
A contractor with one main client, incorporated because that client asked, is the exact pattern the personal services business rules were written for. The test is blunt: if, without the corporation, you would reasonably be regarded as the client's employee, the corporation is a PSB. A PSB loses the small business deduction, pays roughly 44.5% in Ontario, and its deductions collapse to little more than the salary it pays you.
What protects you is facts, not the font on the contract. More than one client over time. A genuine right to subcontract, ideally exercised at least once. Your own equipment, licences and tooling. Real financial risk, such as fixed-price exposure or unpaid rework. Control over where and how the work gets done. There is also a structural backstop worth designing in: a corporation that pays most of its profit out as deductible salary leaves a PSB assessment very little income to tax at the punitive rate. What retained profit should do in the good scenario is covered on our tax planning page.
A one-person share structure, kept honest
For a solo consultancy the defensible structure is boring: common shares to you, you as sole director, done. The dividend-sprinkling share classes bolted onto template incorporations mostly cannot deliver here, because TOSI taxes dividends to family at the top rate unless a carve-out applies, and the excluded-shares carve-out is closed to corporations earning 90% or more of their income from services. That describes nearly every consultancy. The realistic exceptions are a spouse who genuinely works in the business an average of 20 hours a week, or you reaching 65, and neither is created by a share class.
We still draft articles with more than one class authorized, not to promise income splitting today but to keep tomorrow's doors open: an estate freeze, a holding company added by reorganization once retained earnings are worth moving, a clean path to the $1.25 million lifetime capital gains exemption if a sale ever comes. Authorizing flexibility costs nothing at incorporation; pretending the splitting works today is how reassessments start.
Mechanics: articles to first invoice
Our Incorporation service runs the setup as one project, quoted in writing after a free 15-minute discovery call. Ontario or federal articles both work for a one-person consultancy; federal adds Canada-wide name protection and one extra Ontario registration, and a numbered company is perfectly fine when agencies are buying your CV rather than a brand. The pieces that matter come after the articles:
- HST registration on day one. The $30,000 small-supplier threshold makes registration optional at the start, but registering voluntarily recovers 13% on the laptop, monitors and setup costs, and agencies expect a registration number on the first invoice. Billing non-resident clients makes registration more valuable, not less, because zero-rated invoicing keeps input tax credits flowing while you collect nothing.
- Payroll account only when the first salary runs. Opening it early just creates nil-remittance obligations and reminder letters.
- A deliberate first year-end. The first fiscal year can run up to 53 weeks, so the date is a choice. We pick a month that follows your contract cycle and stays clear of personal tax season instead of defaulting to December 31.
- The corporation signs everything. A contract in your personal name undermines both the liability separation and your PSB posture. Bank account, contract and invoices all carry the corporate name from the first engagement.
Two weeks after articles, a Mississauga contractor should have a corporation with a bank account, an HST number, a signed contract in the right name and a calendar of what is due when. That is the whole point: a structure decided on arithmetic, then built once.
