When should you incorporate your business in Ontario?
Incorporating isn't a milestone you hit at a certain revenue number — it's a tradeoff between liability protection, extra admin, and tax mechanics that only work in your favour past a certain point. Here's how to tell where you stand.
The short answer
Incorporate when the business earns comfortably more than you need to live on, exposes you to liability a sole proprietorship can't shield you from, or a client/lender requires it. Below that point, a sole proprietorship is simpler, cheaper to run, and taxed no worse for money you're taking out anyway. There's no fixed income threshold — it's a function of how much of the business's income you actually need personally.
Sole proprietor vs. corporation: what actually changes
A sole proprietorship isn't a separate legal entity — you and the business are the same taxpayer. That's simple, but it means your personal assets are exposed if the business is sued or can't pay its debts, and all business income is taxed on your T1 in the year you earn it, whether you spend it or not.
A corporation is a separate legal person. It can own assets, sign contracts, and owe debts in its own name, which is what gives you liability protection — your personal assets are generally shielded from the corporation's obligations (with exceptions, like personal guarantees you sign yourself). It also files and pays its own tax, separately from you.
| Factor | Sole proprietorship | Corporation |
|---|---|---|
| Liability | Personal assets exposed | Generally shielded |
| Setup and ongoing admin | Minimal | Separate books, T2 filing, more paperwork |
| Credibility with clients/lenders | Fine for most small contracts | Sometimes required (larger contracts, financing) |
| Tax on income you withdraw | Taxed once, on your T1 | Corporate tax, then personal tax on what you take out |
| Tax on income left in the business | Still taxed on your T1 that year | Only corporate tax, until withdrawn |
Credibility is real but qualitative: some clients and most lenders simply prefer, or require, dealing with a corporation over an individual. That's a business-development reason to incorporate, separate from the tax math below.
The tax mechanics, with real numbers
This is where incorporating either pays for itself or doesn't, so it's worth being precise. A Canadian-controlled private corporation claiming the small business deduction pays a net federal corporate tax rate of 9% on qualifying active business income. Ontario adds its own small-business rate on top — 3.2% currently, dropping to 2.2% effective July 1, 2026 — on the first $500,000 of active business income. Combined, that's roughly 12.2% today, falling to about 11.2% from July 2026 onward, on income the corporation keeps. Income beyond that $500,000 small-business limit is taxed at Ontario's general corporate rate of 11.5% instead of the small-business rate.
Compare that to personal tax rates on a T1, which climb well past those numbers as income rises. The gap is the whole reason incorporating can save tax — but only on money that stays in the corporation. The moment you pay yourself a salary or dividend, that amount is taxed again on your personal return, which is why the strategy only works when you don't need to withdraw everything the business earns.
Put plainly: if your business income roughly equals your living expenses, you'll end up withdrawing most of it anyway, and the corporate layer adds tax complexity without much tax benefit. If the business consistently earns more than you need to live on, the surplus can sit in the corporation taxed at the lower rate instead of your marginal personal rate — that's the honest trigger point, not a specific revenue figure.
What changes the day you incorporate
Incorporating adds obligations a sole proprietorship doesn't have:
- A T2 corporate return, due within six months of the corporation's tax year-end.
- A balance-due date of two months after year-end for most corporations, extended to three months for a CCPC claiming the small business deduction that meets the CRA's conditions.
- Possible tax instalments going forward — a corporation is exempt in its first tax year after incorporation, and after that doesn't need to instalment if its tax payable is $3,000 or less in the current or prior year. Cross that, and instalments become part of the routine.
- Separate books and (usually) a separate bank account, since the corporation's finances are legally distinct from yours — this is on top of, not instead of, your own T1.
None of that is a reason to avoid incorporating when the liability or tax case is there — it's just the honest list of what you're taking on, so it doesn't arrive as a surprise in year one.
How AccruBooks fits in
If you incorporate, we handle bookkeeping and year-end and tax for the corporation from day one — the T2 filing, the balance-due timeline, and instalments if they apply, alongside your monthly books (from $200/month, HST filings included). Your personal T1 is free when it's filed alongside a business engagement, so incorporating doesn't mean juggling two separate relationships for two connected returns.
If you're not sure which side of the line you're on, that's normal — the honest answer usually needs your actual numbers, not a rule of thumb from a web page.
Questions
Quick answers
Does incorporating automatically lower my tax bill?
Not automatically — it changes the mechanics. A Canadian-controlled private corporation claiming the small business deduction pays its own tax (roughly 12.2% combined federal and Ontario small-business rate on the first $500,000 of active business income, dropping to about 11.2% combined effective July 1, 2026, as Ontario's own rate falls from 3.2% to 2.2%), separate from your personal return. The savings show up when you leave money in the corporation rather than paying it all out to yourself, since personal tax applies on top when you eventually withdraw it. If you need most of what the business earns to live on, the corporate layer mostly adds paperwork.
What new tax filings does a corporation have to do?
A T2 corporate return, filed within six months of the corporation's tax year-end. A CCPC claiming the small business deduction that meets the CRA's conditions gets an extended balance-due date of three months after year-end (rather than two), and a corporation's first tax year after incorporation is exempt from having to pay instalments — after that, instalments can kick in depending on how much tax the corporation owes. You also keep filing HST returns and your own personal T1, exactly as before.
Is incorporating worth it for a small, part-time business?
Often not yet. Incorporation adds a second set of books, a T2 filing, and (depending on your bank) a separate business account — real ongoing admin, not a one-time errand. It tends to pay for itself once the business generates more income than you need to live on, so some of it can stay in the corporation. Below that point, a sole proprietorship is usually simpler and just as effective.
Can I switch from sole proprietor to incorporated without starting over?
Yes — many businesses run for a while as a sole proprietorship and incorporate later once income and liability exposure justify it. There's no requirement to incorporate on day one, and no penalty for waiting until the numbers make the case for you.
The fine print: this guide is general information for Canadian businesses, current as of August 15, 2026. Rates and rules change, and your situation has details a web page can't see — so before acting on anything here, confirm it against the CRA's own pages or ask us directly.
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