When Should You Incorporate Your Business in Ontario?

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Your bookkeeper mentions it. Your brother in law is certain about it. Someone at a networking breakfast says they saved a fortune doing it. Incorporate, and you will pay less tax.

Sometimes that is true. Often it is not, and nobody saying it has asked the question that decides the answer: how much of your profit can you afford to leave inside the company?

That is the whole test. Incorporating does not reduce the tax on money you take out and spend on rent and groceries. It reduces the tax on money you leave behind. For the 2025 tax year an Ontario corporation pays 12.2% on its first $500,000 of active business income, while a sole proprietor earning $200,000 pays about 47.97% on the top slice once the Ontario surtax is counted. The gap is real, and you only get to use it on surplus. What follows is the arithmetic, the traps, and the annual cost of the company, starting with the corporate tax return you file every year whether you made money or not.

Bottom Line Up Front

  • For 2025, an Ontario corporation pays 12.2% on its first $500,000 of active business income (9% federal plus 3.2% Ontario). An Ontario individual’s marginal rate at $200,000 is about 47.97% once the Ontario surtax is added.
  • That gap is a deferral, not a discount, and you capture it only on profit you leave in the corporation.
  • There is no magic income number. The test is how much you can leave behind, not how much you bill.
  • If one client controls your work and you would look like their employee without the corporation, CRA can call it a personal services business: no small business deduction, an extra 5% federal tax, almost no deductible expenses.
  • Setting up costs $200 federally or $300 in Ontario, and every year after that you owe a T2 return, even with no income.

On this page

The short answer: there is no magic income number

You will read that $80,000 or $100,000 is the point where incorporating pays off. Ignore it. That rule of thumb assumes you leave most of your profit in the company, and almost nobody at $80,000 does.

The honest version has two parts. A Canadian-controlled private corporation gets a low rate on the first $500,000 of active business income through the small business deduction (CRA T2 guide, 2025). But that low rate only helps on dollars that stay in the corporation. Move a dollar to your own bank account and you pay personal tax on it at your normal rates.

So the question is not “do I earn enough”. It is “do I earn more than I spend, and by how much”.

Put a number on it. At $200,000 of income in Ontario in 2025, your marginal rate on the top slice is 41.16% from the brackets alone, and 47.97% once the Ontario surtax is added. Your corporation’s rate on the same dollar is 12.2%. Every $10,000 you can genuinely leave in the company defers roughly $3,600 of tax for that year. Leave nothing, defer nothing.

Work out your real number: last year’s net business income, minus what you actually spent living. That difference is what incorporation has to work with.

How the small business deduction works

The small business deduction cuts the federal corporate rate from 15% to 9% on the first $500,000 of active business income earned by a Canadian-controlled private corporation (CCPC).

The federal mechanics run in three steps. The basic rate of Part I tax is 38% of taxable income. A 10% federal abatement brings that to 28% on income earned in a province. From there, the general rate reduction takes it to a net 15%, and the small business deduction takes eligible income down to 9% (CRA, 2025).

Ontario does the same thing on its side. The Ontario basic corporate rate is 11.5%, and the Ontario small business deduction of 8.3 percentage points brings the lower rate to 3.2% (CRA, Ontario corporation tax, 2025).

Add them and you get the number that matters.

What is being taxed (2025) Rate
Corporate active income, first $500,000, Ontario CCPC 12.2% (9% federal + 3.2% Ontario)
Corporate active income above the limit, Ontario 26.5% (15% federal + 11.5% Ontario)
You personally, income from $114,750 to $150,000, before surtax 37.16% (26% federal + 11.16% Ontario)
You personally, income from $177,882 to $220,000, before surtax 41.16% (29% federal + 12.16% Ontario)
You personally, income from $177,882 to $220,000, with the Ontario surtax 47.97% (29% federal + 18.97% effective Ontario)

Personal rates are from CRA’s 2025 tax rates and income brackets. The bracket rates do not include the Ontario surtax, which for 2025 adds 20% of Ontario tax over $5,710 plus a further 36% of Ontario tax over $7,307 (CRA, 2025 Ontario payroll tables, 2025). At this income level the surtax multiplies the Ontario rate by 1.56, which is why the real marginal rate is nearly 48% rather than 41.16%. Brackets and surtax thresholds are indexed annually, so check the current year’s figures before you plan around them.

Two things shrink the $500,000 business limit: taxable capital employed in Canada between $10 million and $50 million, and combined passive investment income running from $50,000 to $150,000, at which point the limit reaches nil (CRA T2 guide, 2025). Most owner-operators never touch either, but a corporation holding a large investment portfolio can lose the low rate entirely.

One change to put in your calendar: effective July 1, 2026, the Ontario lower rate drops from 3.2% to 2.2% (CRA, what’s new for corporations, 2026). Corporations with year ends after that date will see a combined rate below 12.2%.

The deferral: what leaving money in the company buys you

A corporation buys you time and control over timing, not a permanent tax cut.

The mechanism is simple. Your corporation earns a dollar of active business income and pays 12.2% on it. You keep 87.8 cents working inside the company instead of the roughly 52 cents you would have kept as a sole proprietor at a 47.97% marginal rate. That extra capital can buy equipment, fund a hire, or cover a slow quarter.

Later, when you pay the money out to yourself as a dividend, personal tax lands. Non-eligible dividends are grossed up by 15% on your T1 and then reduced by a dividend tax credit (CRA, lines 12000 and 12010, 2025). The system is built so that corporate tax plus personal tax on the payout lands near what you would have paid by earning the income personally in the first place.

So the benefit is real but specific. You get to choose which year the personal tax happens in, and more capital compounds in the meantime. A contractor who bills $250,000 one year and $90,000 the next can spread the payout across both and stay out of the top brackets. A sole proprietor cannot.

If you have no surplus to leave behind, none of this applies to you.

A worked example in real dollars (2025)

Take an Ontario consultant with $200,000 of net business income in 2025 who needs $90,000 to live on. This is an illustration, not a client, and it ignores personal credits and CPP to keep the comparison clean. The Ontario surtax is included, because leaving it out understates the personal side by thousands of dollars.

Option A, sole proprietor. All $200,000 is personal income, and the slice between $90,000 and $200,000 is taxed at the combined federal and Ontario bracket rates:

Slice of income Federal Ontario Combined Tax
$90,000 to $105,775 20.5% 9.15% 29.65% $4,677
$105,775 to $114,750 20.5% 11.16% 31.66% $2,841
$114,750 to $150,000 26% 11.16% 37.16% $13,099
$150,000 to $177,882 26% 12.16% 38.16% $10,640
$177,882 to $200,000 29% 12.16% 41.16% $9,104
Ontario surtax on the surplus $6,530
Total on the $110,000 surplus $46,891

The surtax line is the extra Ontario tax the surplus triggers: Ontario tax at $200,000 attracts $6,602 of surtax, against $71 at $90,000 (CRA, 2025 Ontario payroll tables, linked above).

Option B, corporation. The company pays you $90,000 in salary, which it deducts and you report personally, exactly as before. The remaining $110,000 stays in the corporation and is taxed at 12.2%, or $13,420. The company keeps $96,580.

The difference for that single year is $33,471 of tax deferred, sitting in the corporation instead of at CRA. Repeat it for five years and the working capital difference is substantial.

Now the honest half. When that money comes out as dividends, you pay personal tax then. The $33,471 is not yours to keep. It is yours to use, for as long as you leave it there.

When incorporating does not pay

Four situations where a corporation costs more than it returns.

You spend everything you earn. If your net income is $110,000 and your household consumes $105,000, there is no surplus to tax at 12.2%. You pay roughly the same personal tax you pay now, plus accounting fees and filing obligations. A personal tax return with a T2125 statement of business activities is cheaper and does the same job.

You are still losing money. A sole proprietor’s business loss comes off your other income for the year, and a non-capital loss can be carried back 3 years or forward 20 (CRA, T4002 Chapter 5, 2025). If you have employment income or a spouse’s income in the picture, that loss is worth real money right now. A corporation is taxed separately from its owners (Corporations Canada), so its losses stay locked inside the company until the company earns something to apply them against.

Your income is small and steady. Below roughly $60,000 of net income, the fixed annual cost of a corporation eats most of the rate difference.

One client controls your work. That is not just a weak case for incorporating. It is an actively dangerous one, which is the next section.

The personal services business trap

This is the single biggest risk for incorporated IT contractors, engineers, project managers and trades who work through one agency or one client.

A personal services business (PSB) is a corporation providing services where the specified shareholder doing the work would reasonably be considered an employee of the payer if the corporation did not exist (CRA, 2025). CRA calls that person an incorporated employee.

CRA’s fact sheet sets out the conditions. Your corporation may be carrying on a PSB where you or a related person is a specified shareholder, the corporation provides services to another business, you would be considered an employee of that business if the corporation did not exist, the corporation employs five or fewer full-time employees throughout the year, and the payments do not come from an associated corporation (CRA fact sheet, 2025).

What it costs if CRA makes the call

A PSB cannot claim the small business deduction and cannot claim the general tax rate reduction. It pays the full federal and provincial corporate rates plus an additional 5% tax on PSB income (CRA fact sheet, 2025).

Run the arithmetic on the rates cited above. Federal tax after the 10% abatement but without the general rate reduction is 28%. Add the 5% PSB tax and you are at 33% federally. Add the Ontario basic rate of 11.5% and the combined rate is 44.5%, against the 12.2% you thought you were getting.

Then it gets worse. A PSB may deduct only salary and wages paid to the incorporated employee, benefits and allowances provided to that person, certain costs of selling property or negotiating contracts, and legal expenses incurred in collecting amounts owing (CRA, PSB obligations, 2025). The home office, the vehicle, the software, the meals: all denied.

CRA has run a personal services business pilot contacting corporations in this position, so the risk is not theoretical.

The defence is the same set of facts that separates a contractor from an employee: control over how and when you work, your own tools, the ability to subcontract, a real chance of profit and risk of loss, and more than one client. If you are already incorporated and working through one agency, the deductions you can safely claim are narrower than most people assume, and tax write-offs for IT contractors is the place to start.

Reasons to incorporate that have nothing to do with tax

Plenty of people incorporate for reasons the tax arithmetic never captures, and those reasons stand on their own.

Limited liability. Shareholders are not responsible for a corporation’s debts, and if it fails they lose only what they invested (Corporations Canada). A sole proprietor’s business debts are personal debts. The caveat matters: the protection disappears wherever you sign a personal guarantee, which most banks and many commercial landlords require.

A separate legal person. A corporation can own property, borrow and sign contracts in its own name, and it continues to exist until it is wound up, amalgamated or dissolved (Corporations Canada).

Clients who require it. Many agencies, government contracts and large enterprises will not engage an unincorporated individual, usually because of their own worker classification exposure. If the work is only open to corporations, the decision has been made for you.

Name protection. Federal incorporation gives you the right to use your corporate name across Canada (Corporations Canada).

None of these reasons lower your tax bill. They are reasons to accept the cost, not to expect a refund.

What a corporation actually costs you every year

A corporation is a permanent administrative commitment. Budget for the setup fee once and the obligations forever.

Obligation What it involves
Incorporation fee $200 online federally, or $300 online in Ontario
Federal annual return $12 per year for a federal corporation
Ontario annual return Filed through the Ontario Business Registry within 6 months of fiscal year end
T2 corporate return Every tax year, even with no tax payable and even if inactive
T2 deadline Within six months of the end of each tax year
Balance owing Two months after year end, or three months for a CCPC that claimed the small business deduction and met the conditions
Payroll account Required before your first remittance due date if you pay yourself a salary
GST/HST registration Once you pass $30,000 in taxable sales over four consecutive calendar quarters
Corporate records (the minute book) Articles, by-laws, minutes, resolutions, share and securities registers, kept at the registered office

Sources, in order: Corporations Canada fees, Ontario registry fees, CRA T2 filing requirement, CRA T2 deadline, CRA balance-due day, CRA payroll registration, CRA GST/HST registration, Corporations Canada corporate records. All current as of September 2026.

The line most people underestimate is the bookkeeping. A corporation needs its own bank account and its own books, and mixing personal spending into the company account creates shareholder loan problems that cost more to unwind than they ever saved. Sort that out before you incorporate, whether you do it yourself or hand it to bookkeeping support.

The corporation also needs its own GST/HST number and its own returns, a filing cycle separate from the T2. Budget for HST registration and filing as part of the annual cost.

Federal or Ontario incorporation?

Federal costs $200 online and carries name rights across Canada. Ontario costs $300 online. A federal corporation still has to register provincially, because “provincial and territorial legislation requires you to register your federal corporation in each province and territory in which it will conduct business” (Corporations Canada, 2026).

For a consultant or trades business working only in the GTA, Ontario is usually the simpler path. Federal suits you better if you expect to operate in several provinces or you want the national name.

Are you ready? A self-check

You are probably ready if:

  • Your net business income clears household spending by at least $40,000 to $50,000 a year
  • That surplus repeats, rather than coming from one unusual contract
  • You have two or more clients, or one client and a real ability to take on others
  • You carry business risk: staff, inventory, a lease, equipment, or work that could generate a claim
  • You keep proper books, or you are ready to pay someone to
  • A client or contract requires a corporation before they will engage you

You are probably not ready yet if:

  • You spend essentially everything the business earns
  • You are still in loss years and have other income those losses could offset
  • One client sets your hours, supplies your tools and directs your work
  • Your net income is under roughly $60,000 and steady
  • Your records are a bank statement and a shoebox
  • Nobody has shown you the arithmetic on your own numbers

Land in the middle, as many people do, and the usual answer is to wait a year and watch your actual surplus rather than your revenue.

Working out whether the numbers justify it on your figures? Ruby Tax has been setting up and filing for Ontario corporations from North York for over ten years, and you talk to the person doing the work, not an account manager. Get a free quote or call 647-990-7258.

Common Questions

Can I incorporate partway through the year?

Yes. Your sole proprietorship income up to the incorporation date stays on your personal return, and the corporation reports from its start date to its first year end. It picks its own fiscal year end, which need not be December 31, and its T2 is due within six months of that date (CRA, 2025).

Do I have to pay myself a salary?

No. You can take salary, dividends, or a mix. Salary requires a payroll account before your first remittance due date, plus income tax, CPP and EI deductions and T4 slips (CRA, 2025). Dividends skip the payroll machinery but create no RRSP room and build no CPP. The right mix depends on your age and your RRSP position, so it is worth a conversation rather than a default.

Does incorporating protect me if I have already signed a personal guarantee?

No. Limited liability protects shareholders from the corporation’s debts (Corporations Canada), but a personal guarantee is your own promise to pay and sits outside that protection. Banks, landlords and some suppliers routinely ask for one. Incorporating afterwards does not undo it.

What happens to my HST number when I incorporate?

The corporation is a new legal person, so it needs its own GST/HST registration, and the sole proprietorship account closes with a final return. Mistiming the switch is a common way people end up with late HST returns and interest on a business that was never late.

What to do next

Pull last year’s numbers and do one calculation: net business income minus what you actually withdrew to live on. If that gap is small, stay a sole proprietor and revisit next year. If it is $40,000 or more and looks repeatable, the 12.2% corporate rate on retained profit is worth the annual cost of a T2, a payroll account and a real set of books.

Before you file articles, check two things: whether one client dominates your work, which is the PSB risk, and whether you are ready to keep the corporation’s money genuinely separate from your own. Both are easier to fix before incorporation than after.

If you want the arithmetic run on your actual figures rather than a rule of thumb, business setup and incorporation help starts with exactly that calculation.

About the author

Raj is the principal of Ruby Tax, a CRA e-file certified tax and accounting practice at 250 Consumers Road in North York. He has spent over ten years preparing personal and corporate returns for clients across Canada, from first-time filers to incorporated businesses and franchise operators. He sets up and files for Ontario corporations across the GTA and remotely.

Published: September 14, 2026. Last updated: September 14, 2026.

This article is general information, not tax advice for your situation. Tax rules change and the right answer depends on your facts. Confirm anything here against current CRA guidance or talk to us before you act on it.

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