How Do I Register a Small Business in Ontario?
Registering a business in Ontario starts with choosing the legal structure and understanding whether the business name, corporation or partnership needs to be registered. The provincial registration is only one part of setup; tax accounts, bookkeeping and payroll may follow depending on what the business actually does.
Choose the business structure first
A sole proprietorship, partnership and corporation are different legal and tax structures. Do not choose a corporation only because it sounds more professional. Consider liability, tax, administration, ownership and future plans.
Use the Ontario Business Registry
Ontario says businesses with employees, facilities or offices in Ontario use the Ontario Business Registry for applicable registrations. The online process requires an Ontario.ca Login and Ontario Business Account for many transactions.
Check the business name
Before registering a business name, search the Ontario Business Registry and consider whether the name creates trademark or branding issues. A provincial registration does not automatically give broad trademark protection.
Set up federal tax accounts when needed
Depending on the structure and activity, you may need a CRA Business Number and program accounts such as GST/HST, payroll or corporation income tax. Since July 2026, CRA Business Registration Online is accessed through a CRA account.
Set up bookkeeping immediately
Opening the business is the best time to separate business banking, create a chart of accounts, choose bookkeeping software and decide how receipts and invoices will be stored. Fixing those systems later is usually more expensive.
FAQ
Do all Ontario sole proprietors need to register a business name?
It depends on the name used and the Ontario registration rules. Check the current provincial requirements for your situation.
Does Ontario registration automatically register GST/HST?
No. CRA tax-program accounts are federal and may require a separate registration.
Should I incorporate before speaking with an accountant or lawyer?
If the decision is material, it can be useful to understand tax and legal consequences before registering the structure.
Call to action
GROWS Financial can help with the financial setup around a new Ontario business, including bookkeeping, tax accounts and ongoing filing requirements.
Related services: Business Registration, Accounting & Bookkeeping.
Related reading: Do Small Businesses Need an Accountant in Canada?
Official sources for fact-checking
Last reviewed: October 21, 2026.