Choosing between a sole proprietorship and incorporation comes down to three things: cost, liability, and tax. A sole proprietorship is the fastest and cheapest way to start in Ontario, while incorporation adds legal protection and tax advantages once your profit grows. Here is how to decide which fits your business.
The Two Structures at a Glance
When you start a business in Ontario, you usually pick one of two legal structures. They look similar from the outside, but they are very different in the eyes of the law and the tax system.
- Sole proprietorship — You and the business are the same legal entity. You simply register a business name to operate under. It is the fastest and cheapest path to getting started.
- Incorporation — You create a separate legal entity (a corporation). The company owns the business, signs contracts, and is taxed in its own right. You become a shareholder and usually a director.
That single difference — same entity versus separate entity — drives almost everything else: who is liable for debts, how profits are taxed, and how much paperwork you carry each year.
Cost and Speed to Register
For many GTA founders, the first question is simply how fast and how cheap. Here the sole proprietorship wins clearly.
| Factor | Sole Proprietorship | Ontario Incorporation | Federal Incorporation |
|---|---|---|---|
| Government fee | $60 | $300 | $200 |
| Typical timeline | Same day online | About 5 business days online | Often next business day |
| Validity | Valid 5 years | Ongoing (with annual return) | Ongoing (with annual return) |
| Legal entity | Same as owner | Separate from owner | Separate from owner |
| Name protection | Not protected | Protected | Protected |
A business name registration costs a $60 government fee and is valid for 5 years, after which you renew. Incorporating in Ontario costs a $300 government fee and takes about 5 business days online. Federal incorporation costs $200 and is often processed the next business day — but it comes with extra rules we cover below.
Liability: Who Is on the Hook?
This is where the structures truly diverge.
- With a sole proprietorship, you and the business are the same legal entity. If the business owes money or is sued, your personal assets — savings, car, even your home — are exposed.
- With a corporation, the company is a separate legal person. Its debts and obligations generally stay with the company, giving you limited liability. Incorporating also protects your business name across the jurisdiction.
For low-risk side businesses, the simplicity of a sole proprietorship is often fine. But if you sign leases, take on staff, carry inventory, or work in a field where a client could sue, that liability shield becomes a serious reason to incorporate.
Taxes: The Numbers That Matter
Tax treatment is usually the deciding factor for profitable businesses.
- Sole proprietorship — Business profits are taxed as your personal income. At higher income levels that can reach the top Ontario marginal rate of about 53.53%. There is no way to defer tax; whatever the business earns, you are taxed on personally that year.
- Corporation — Active business income is taxed at the Ontario small-business corporate tax rate of about 12.2% on the first $500,000 of active business income. Money you leave inside the company is taxed at that low rate, letting you defer or smooth income rather than taking it all personally in one year.
That gap — roughly 12.2% versus up to 53.53% — is why incorporation becomes attractive as profits rise. The key word is defer: you still pay personal tax when you draw the money out, but you control the timing.
The Rule of Thumb
As a general guideline, incorporation typically pays off once your net profit is consistently above roughly $75,000 to $80,000. Below that, you are usually drawing most of the profit to live on anyway, so the corporate tax advantage is small and the extra costs may not be worth it. Above that, the ability to leave money in the company and defer personal tax starts to outweigh the overhead.
Ongoing Obligations of a Corporation
Incorporation is not just a one-time fee. A corporation carries real but manageable obligations:
- Maintaining a minute book (records of directors, shareholders, and key decisions).
- Filing an annual return through the Ontario Business Registry.
- More accounting and bookkeeping, since the corporation files its own tax return separate from yours.
None of these are dealbreakers, but they are real costs of time and money that a sole proprietor avoids. Budget for a bookkeeper or accountant if you incorporate.
Don't Forget HST
Whichever structure you choose, the same sales-tax rule applies: HST registration becomes mandatory once your revenue exceeds $30,000 over four consecutive calendar quarters. Many growing businesses hit this threshold before they expect to, so plan for it early and register on time to stay compliant.
A Note for Newcomers
Markham and the GTA are home to many newcomer founders, and here Ontario has a real advantage: Ontario has no director-residency requirement. You can incorporate provincially even if you are new to Canada or not yet a resident.
By contrast, federal incorporation requires that at least 25% of directors be resident Canadians. If you do not have a Canadian-resident director, Ontario incorporation is usually the more practical route. Federal incorporation still has its place — for example, if you want stronger nationwide name protection — but the residency rule is an important catch.
You can review the official steps on Ontario.ca and learn more about federal incorporation through Corporations Canada.
How to Decide
Put simply:
- Choose a sole proprietorship if you want the cheapest, fastest start, your profit is modest, and your liability risk is low.
- Choose incorporation if you want limited liability, name protection, and tax deferral — especially once net profit is consistently above the $75,000 to $80,000 range.
Many founders start as a sole proprietor and incorporate later once profits and risk grow. Both paths are valid; the goal is to match the structure to where your business is today.
If you would rather skip the paperwork entirely, Markham Office offers done-for-you business registration and incorporation for GTA founders — we handle the filings, the name search, and the setup so you can focus on running the business. Reach out and we will help you choose the right structure and get it registered correctly the first time.