Should you incorporate? What changes the day you do

Incorporation is worth it in rough proportion to how much money you leave in the company. An eligible Canadian-controlled private corporation pays 9% federal tax on its first C$500,000 of active business income for 2026, against whatever your personal rate is on those same dollars — but only on the dollars that stay behind. Spend everything you earn and you have bought a liability wrapper and a set of annual filings, with no tax benefit attached.

Deferral is the benefit, and deferral is not avoidance

The low corporate rate applies to income the company keeps. The moment you take money out, personal tax applies to it, and the system is built so that income earned through a corporation and paid to you as dividends carries roughly the same total tax as income you earned personally. That design goal is called integration. It lands close rather than exactly, and the difference in either direction is rarely large enough to be the reason anyone incorporates.

What you gain is time, and the use of the money during that time. A dollar taxed at the small-business rate leaves considerably more behind to buy equipment, pay down the operating line, or sit in the corporation until a year when your personal income is lower — a slow year, a parental leave, retirement. Owners who expect to sell have a second reason: the lifetime capital gains exemption, C$1,275,000 for 2026 dispositions of qualified small-business-corporation shares, applies to shares, and a proprietorship has no shares to sell. The qualification conditions are strict and are worth confirming years ahead of a sale rather than weeks.

What incorporating does not do

It does not make anything deductible that wasn’t. The test is identical on both sides of the line: the cost was incurred to earn business income and the amount is reasonable. Business meals are generally limited to 50% either way, with long-haul truck drivers at 80% on eligible travel. Passenger vehicles land in Class 10.1, where the capital cost is capped — C$39,000 before tax for vehicles acquired in 2026, up from C$38,000 in 2025 — so the corporation does not get a bigger car than you do. Capital cost allowance, the schedule that writes off equipment over several years, runs on the same classes and the same rates for a proprietor as for a corporation.

It does not convert personal spending into business cost either. Where the corporation pays a genuinely personal expense, the CRA generally treats it as a shareholder benefit taxable to you, which costs more than the deduction was ever worth.

And it is not a general shield. A corporation limits certain business liabilities, but it does not defeat a personal guarantee you signed for the lease or the operating line, and professional liability generally follows the professional regardless of whose name is on the invoice. If limited liability is the main reason you are incorporating, that conversation belongs with a lawyer before it belongs with an accountant.

What starts the day you incorporate

You do not trade one return for another. You add one, and a handful of routines around it.

• The T2 — the corporation’s income tax return — is due six months after year-end, so June 30 for a December 31 year-end. The balance of tax owing is generally due earlier: two months after year-end, three months for many CCPCs claiming the small-business deduction. Paying before you file is the part that surprises people in year one.
• Money leaves the company by a mechanism now, not by transfer. Salary means a payroll account, source deductions remitted on a set schedule, and a T4 by the last day of February. Dividends mean a directors’ resolution and a T5 by the same February date. Move cash without choosing one and you have a shareholder loan, repayable within a window tied to your year-ends and taxable in your hands if it isn’t repaid.
• The corporation is a separate person, so it keeps separate everything: its own bank account, its own minute book, directors’ resolutions and share register, and an annual corporate filing with whichever jurisdiction you incorporated in. This is the obligation owners most often discover late, usually when a bank or a buyer asks to see the minute book.
• GST/HST follows the business, not the structure. Registration turns on revenue against a small-supplier threshold the CRA sets, and because the new corporation is a new person, it generally needs its own number even if you were already registered as a proprietor.
• Instalments run on both sides. Corporate instalments are generally not required where total tax payable for the year is C$3,000 or less; your personal instalments still turn on net tax owing above C$3,000 (C$1,800 for Quebec residents) in the current year and in either of the two before it.

The full calendar, including the dates that depend on your year-end, sits on the deadlines table.

The trap that catches one-client contractors

If you incorporate in order to bill a single client — often the employer you just left — the personal services business rules are the first thing to check, not the last. Where the CRA concludes you would reasonably be regarded as an employee of that client but for the corporation in between, the corporation loses the small-business deduction, most deductions other than your own salary are denied, and the income is taxed at a materially higher federal rate. The arithmetic below inverts completely under those rules. It is a live risk for consultants and incorporated contractors billing one name, and it deserves its own read: personal services business risk.

Where the break-even actually sits

The calculation is retained earnings multiplied by the gap between your personal rate and the corporate rate, weighed against what the corporation costs you to run. Both halves are knowable before you incorporate.

Illustrative — round numbers, a December 31 year-end, provincial rates deliberately unnamed.

Your corporation earns C$200,000 of active business income. You draw C$120,000 to live on, so C$80,000 stays behind. Assume a 30-point gap between the rate on your top personal dollars and the corporation’s combined rate on active business income. That is an assumption made to produce arithmetic, not a published figure; your real gap depends on your income and your province. C$80,000 × 30% = C$24,000 that stays in the company this year instead of going to the CRA. It is a loan, not a gift — personal tax lands when the money comes out — but it is C$24,000 working for you in the meantime.

Run it backwards for the break-even. Divide the added compliance cost by the rate gap and you get the retained earnings you need to justify the structure. Our own compliance package starts at C$3,000 a year and covers the T2 and your personal return together, so subtract what you already pay for a proprietorship return to get the true increment, then add the legal fee to incorporate and the annual corporate filing. Say that nets out to C$3,000 of genuinely added cost. Against a 30-point gap, break-even is about C$10,000 of retained earnings. Below that, incorporation costs money and buys you the liability wrapper and the cleaner balance sheet, which are real things — just not tax things.

Two facts move that line more than anything else: how much you genuinely leave behind rather than intend to, and whether the PSB rules apply. Owners routinely over-forecast the first.

What Cadence does

We run the comparison before you incorporate, on your numbers rather than a rule of thumb — actual draws, likely retained earnings, the corporate and personal rates in your province, and whether a single-client billing pattern puts the small-business deduction at risk. Incorporation analysis sits inside tax planning, and if the answer is that you should stay a proprietor another year, you will get that answer with the arithmetic behind it. Fees are fixed before any work starts, which is what lets the compliance side of your break-even be a number rather than a range.