- A corporation is a separate legal person, distinct in every legal sense from you and from your former sole proprietorship.
- Any agreement your sole proprietorship signed — with suppliers, landlords, clients — was signed by you personally.
- Incorporating creates a genuine separation between you and the business going forward — the corporation, not you personally, is generally on the hook for the business's ongoing debts and…
Deciding to convert a sole proprietorship to a corporation is a distinct legal event, not a rebranding. A sole proprietorship is simply you, operating a business under your own name or a registered trade name — there's no separate legal entity to convert. What actually happens is that you incorporate a brand-new corporation and then move your business over to it, piece by piece.
That distinction matters because nothing transfers automatically. Understanding what has to be actively moved — and what changes in your own liability — avoids some genuinely avoidable surprises in the weeks after you incorporate.
You're Creating a New Legal Person, Not Relabelling the Old Business
A corporation is a separate legal person, distinct in every legal sense from you and from your former sole proprietorship. This separateness is the source of limited liability, but it also means there is no built-in mechanism that automatically moves your existing contracts, bank accounts, or business name into the new corporation's hands. You are, in effect, starting a new legal entity and transferring assets and relationships into it.
What Doesn't Transfer Automatically
- Contracts. Any agreement your sole proprietorship signed — with suppliers, landlords, clients — was signed by you personally. Moving that contract to the corporation generally requires the other party's consent, through an assignment or a new contract, unless the agreement already allows it.
- Bank accounts. You'll need to open new accounts in the corporation's name; a sole proprietorship account doesn't relabel itself.
- Leases. A landlord's consent is typically required to assign a lease to your new corporation, and many commercial leases address this specifically.
- Business name registration. If you registered a trade name as a sole proprietor, that registration was tied to you as an individual under the Business Names Act. Operating the same name through the corporation generally requires a fresh registration under the corporation.
- CRA program accounts. GST/HST, payroll, and other CRA accounts registered to you personally as a sole proprietor don't carry over — the corporation is a new taxpayer and needs its own Business Number and program registrations.
What Actually Changes for Liability
Incorporating creates a genuine separation between you and the business going forward — the corporation, not you personally, is generally on the hook for the business's ongoing debts and obligations. But this isn't a total shield. Personal guarantees you sign for loans or leases, unremitted source deductions or HST, and certain statutory director liabilities can still reach you individually even after incorporating. Existing sole-proprietorship debts also don't disappear just because you incorporate — those remain yours personally unless a lender specifically agrees otherwise.
A Practical Checklist for the Switch
- [ ] Incorporate the new corporation (choose OBCA or CBCA, named or numbered)
- [ ] Register a business name under the corporation, if you'll keep operating under the same trade name
- [ ] Open new bank accounts in the corporation's name
- [ ] Notify key suppliers, landlords, and clients, and get consent to assign or re-sign contracts
- [ ] Register the corporation's own CRA Business Number and relevant program accounts (GST/HST, payroll, corporate tax)
- [ ] Set up a minute book and, if there's more than one owner, a shareholders' agreement
- [ ] Confirm what happens to existing sole-proprietorship debts and any personal guarantees tied to them
- [ ] Update invoices, contracts, and your website to reflect the corporation as the operating entity
Frequently asked questions
Do I need to dissolve my sole proprietorship separately?
There's no formal "dissolution" filing for a sole proprietorship the way there is for a corporation. If you registered a business name as a sole proprietor and you're no longer using it that way, you'd typically let that registration lapse or cancel it once the corporation has its own registration in place.
Will my business credit or history carry over to the corporation?
Generally, no. The corporation is a new legal entity with no operating history of its own. Lenders and credit bureaus typically start fresh, which can matter if you're planning to seek financing shortly after incorporating.
Can I keep using my existing HST number?
No. A GST/HST account registered to you personally as a sole proprietor is tied to you as the registrant. The corporation needs its own registration once it takes over the taxable activity.
Is there a tax cost to converting?
There can be tax implications to moving assets from yourself into a corporation, and accountants and tax lawyers use specific mechanisms to manage this efficiently. This is squarely a conversation to have before you incorporate, not after.
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