Incorporation Guide
Last updated 2026-08-22. A practical guide from CorpStart, document preparation specialists for Ontario and federal corporations.
A sole proprietorship offers no liability protection: your personal assets are exposed if the business is sued or owes debts. An Ontario corporation limits your personal liability, reduces your tax burden as income grows, and signals credibility to banks and investors. Most growing businesses benefit from incorporating sooner rather than later.
A sole proprietorship is not a separate legal entity: it is you, doing business. Every contract your business signs, every debt it incurs, and every lawsuit it faces is your personal legal responsibility. If your business is sued for $500,000, your personal savings, home, and other assets are on the line.
A corporation is a separate legal entity created by the government. It can own property, sign contracts, and be sued, all independently of you. Your liability as a shareholder is generally limited to the money you invested in the corporation. Personal assets are shielded (with some exceptions, such as personal guarantees on loans).
A sole proprietor reports all business income on their personal income tax return at personal tax rates. In Ontario, the top personal income tax rate exceeds 50% for high earners. A corporation pays the small business corporate income tax rate on active business income up to the small business deduction limit, a rate significantly lower than the top personal rate.
Tax deferral, meaning profits left in the corporation and withdrawn later, is the tool most incorporated owners actually benefit from, and it is not available to a sole proprietor. Income splitting through dividends to family shareholders belongs in a different category now. Since 2018 the tax on split income has taxed those dividends at the top marginal rate unless the recipient meets an exclusion, which generally turns on working in the business at least twenty hours a week, or being twenty-five or older and holding at least ten per cent of the votes and value of a company that is not a services business. Treat it as a planning question for a qualified accountant who knows your circumstances, not as a benefit that follows from incorporating.
Many institutional clients (government agencies, larger corporations, and regulated industries) require or strongly prefer doing business with incorporated entities. A sole proprietorship is often disqualified from government procurement, some commercial leases, and client contracts that specify a corporate counterparty.
Banks and lenders also treat incorporated businesses differently. Business credit under the corporation builds independently of personal credit. Some lenders offer better terms to corporations because the entity has its own legal standing and balance sheet. A corporation also survives the departure of any individual, which matters for long-term contracts and investor confidence.
Incorporating in Ontario costs the $300 government filing fee plus CorpStart's flat service fee, and your complete Minute Book and Certificate of Incorporation are delivered the same day. There is no lawyer required.
Transitioning an existing business into a corporation may involve a tax-deferred rollover of business assets (a Section 85 rollover under the Income Tax Act), which your accountant can handle. CorpStart handles the incorporation; your accountant handles the tax structuring of the business transfer. The two steps can run in parallel.
If your business earns less than approximately $50,000 per year in net profit and has minimal liability exposure, the cost and administrative overhead of maintaining a corporation (annual returns, separate bank account, corporate tax return, Minute Book updates) may not justify the switch yet. Keeping a sole proprietor HST registration for small operations is simpler.
However, as soon as your income grows, liability exposure increases (e.g., you sign contracts, hire employees, or carry inventory), or you want to bring on investors or partners, incorporation becomes the clearly superior structure. CorpStart can have you incorporated the same business day, so there is rarely a reason to delay once the inflection point is reached.
Sole Proprietorship vs. Ontario Corporation: Key Comparison
| Factor | Sole Proprietorship | Ontario Corporation |
|---|---|---|
| Personal liability | Unlimited (personal assets at risk) | Limited to amount invested |
| Business tax rate | Personal rate (up to ~53% in Ontario) | Small business rate on active income |
| Income splitting | Not available | Possible via dividends, but only where the recipient meets a TOSI exclusion |
| Tax deferral | Not available | Available (profits retained in corp) |
| Government contract eligibility | Often excluded | Typically eligible |
| Setup cost | $60 trade name (optional) | $599+ (includes Minute Book) |
| Ongoing compliance | HST return, personal T1 | Annual Return, T2 corporate return, Minute Book |
| Business survives owner? | No (tied to individual) | Yes (independent legal entity) |
Do I need a lawyer to convert from a sole proprietorship to a corporation?
No. Incorporating in Ontario or federally does not require a lawyer: both registries allow self-filing. CorpStart prepares and files your Articles of Incorporation without legal representation. You may want an accountant to structure the asset transfer from the sole proprietorship into the corporation for tax efficiency, but the incorporation itself is straightforward.
Can I keep my existing business name when I incorporate?
If you have been operating under a registered business name (trade name) as a sole proprietor, you can incorporate as a numbered or named corporation and re-register the same trade name under the new corporation. Alternatively, you can incorporate directly as a named corporation using your existing business name, subject to NUANS availability.
Does incorporating protect me from all personal liability?
No. Limited liability has limits. If you personally guarantee a business loan or lease, you are personally liable on that guarantee regardless of the corporate structure. Directors can also face personal liability for unpaid employee wages, HST remittances, and certain other statutory obligations. Incorporation substantially reduces personal liability for most business risks, but is not an absolute shield.
How long does it take to incorporate in Ontario?
Ontario online incorporations through the Ontario Business Registry are processed immediately. CorpStart prepares and submits your Articles the same business day, so most clients have their Certificate of Incorporation and complete Minute Book the same day they start the process.
Ready to incorporate?
Filed with the Ontario Business Registry the same business day. Flat service fee, government fee collected at cost, no hidden extras.
Start my corporationCorpStart is a document preparation service, not a law firm. The information on this page is general in nature and does not constitute legal advice. For advice specific to your situation, consult a licensed lawyer.