Ontario business registration is the essential first step for any entrepreneur starting a business in Canada’s most populated province. Whether you’re launching a sole proprietorship, partnership, or corporation, understanding the registration process, costs, and ongoing compliance requirements saves you time, money, and legal headaches. Pathak CPA in Mississauga guides Ontario entrepreneurs through every step of business registration and the ongoing accounting that follows. Call 437-872-7399 to get started.

Business Structures Available in Ontario

Before registering, you must choose your business structure. Each has different registration requirements, tax implications, and liability exposure:

Step-by-Step: How to Register a Business in Ontario

Step 1: Choose and Search Your Business Name

Before registering, conduct an Ontario Business Name Search (NUANS) to ensure your name isn’t already in use. For incorporated companies, a NUANS report is mandatory and must be completed within 90 days of filing Articles of Incorporation.

• Ontario NUANS search costs approximately $26.37 (plus applicable fees)
• You can search at ServiceOntario.ca or through a private search firm
• Federal NUANS is required for federal incorporations

Step 2: Register Your Business Name (Sole Proprietorship/Partnership)

If you’re operating under a name other than your own, you must register a business name under the Ontario Business Names Act. This is called a “sole proprietor registration” or “DBA” (doing business as).

• Cost: $60 online through ServiceOntario
• Registration period: 5 years (renewable)
• Can be done online at Ontario.ca/BusinessRegistry

Step 3: Incorporate (Corporations)

If incorporating provincially under the Ontario Business Corporations Act (OBCA), you file Articles of Incorporation with Ontario’s Ministry of Public and Business Service Delivery. Your Mississauga accountant or lawyer handles this for you.

• Online incorporation: $300 through ServiceOntario
• Through a law firm or accountant: $500–$2,500 depending on complexity
• Federal incorporation: $200 online through Corporations Canada

Step 4: Register for CRA Business Accounts

Once registered provincially, you need CRA registrations for tax compliance. A small business accountant can handle all CRA registrations:

• Business Number (BN) — the master 9-digit number linking all your CRA accounts; obtained automatically when you incorporate federally, or register separately for provincial companies
• GST/HST Account — required once you earn $30,000+ in revenue in four consecutive calendar quarters; voluntary registration available for smaller businesses (see our GST/HST registration guide)
• Payroll Account (RP) — required when you hire employees and deduct CPP, EI, and income tax
• Corporate Income Tax Account (RC) — automatic for incorporated companies; must file T2 annually within 6 months of fiscal year-end
• Import/Export Account (RM) — for businesses importing or exporting goods

Step 5: Register for Ontario Provincial Accounts (If Required)

Depending on your business activities in Ontario, you may also need:

• Employer Health Tax (EHT) — if annual Ontario payroll exceeds $1,000,000 (exemption for eligible employers)
• WSIB (Workplace Safety and Insurance Board) — mandatory for most Ontario industries; register within 10 days of hiring first employee
• Retail Sales Tax — Ontario eliminated RST for most goods (replaced by HST); still applies to specific items like insurance premiums
• Liquor, tobacco, or cannabis licences — through AGCO if applicable

Ontario Business Registration Costs Summary

Ontario vs. Federal Incorporation: Which Is Better?

This is one of the most common questions from new entrepreneurs. The right choice depends on where you’ll operate and your long-term plans:

• Ontario corporation — operates only in Ontario; lower setup cost; must register extra-provincially to operate in other provinces
• Federal corporation — can operate anywhere in Canada; stronger name protection across provinces; must still register in Ontario to operate there
• Recommendation for most Mississauga/GTA businesses: Ontario incorporation is sufficient for local and regional operations; federal makes sense if you have national plans or need pan-Canadian name protection

Your corporate accountant can walk you through the trade-offs for your specific situation.

Post-Registration: Ongoing Compliance for Ontario Businesses

Registration is just the beginning. Once your business is operational, you face ongoing CRA compliance obligations:

• Annual corporate tax return (T2) — due 6 months after fiscal year-end; taxes due within 2–3 months depending on CCPC status
• Annual Return to Ontario/federal — confirms the corporation’s registered address and director information; $25 Ontario, $20 federal
• HST filing — quarterly, monthly, or annually depending on revenue; see our HST filing Ontario guide
• Payroll remittances — CPP, EI, and income tax withholding due monthly or quarterly
• Bookkeeping — accurate records required; see our Mississauga bookkeeping services

Common Mistakes When Registering a Business in Ontario

• Skipping incorporation — operating as a sole proprietor when corporate tax rates and liability protection warrant incorporation; corporate tax rate can be as low as 12.2% versus 53.53% personal marginal rate
• Forgetting HST registration — missing the $30,000 threshold and filing late; CRA penalties apply
• Not registering WSIB — operating with employees and facing WSIB penalties for late registration
• Using a personal bank account — mixing personal and business finances creates CRA audit exposure
• Missing the Annual Return — corporations that miss annual filings can be dissolved by the province

Frequently Asked Questions

Do I need an accountant to register a business in Ontario?

You don’t legally need an accountant to register a business name or incorporate in Ontario — the government’s online portals allow self-filing. However, working with a small business accountant in Mississauga ensures you choose the right structure for tax efficiency, set up CRA accounts correctly from day one, and avoid common compliance mistakes that cost far more to fix than prevent.

How long does Ontario business registration take?

Online registration through Ontario Business Registry is typically same-day (within hours). Provincial incorporation (OBCA) through ServiceOntario online takes 1–5 business days. Federal incorporation through Corporations Canada typically takes 1–5 business days online, or up to 20 days by mail.

Can a foreign resident register an Ontario business?

Yes — non-residents can register Ontario business names and incorporate Ontario corporations. However, Ontario corporations require at least 25% of directors to be Canadian residents. Federal corporations (CBCA) require 25% Canadian resident directors (with some exceptions for certain industries). Non-residents often find federal incorporation more flexible for their situations.

What’s the difference between a business name registration and incorporation?

A business name registration (sole proprietorship/partnership) simply records your trading name — you remain personally liable for all business debts and pay tax at personal rates. Incorporation creates a separate legal entity (the corporation) that limits your personal liability, allows income splitting through salary and dividends, and enables access to the small business corporate tax rate of 12.2% in Ontario.

Start Your Ontario Business the Right Way

Pathak Professional Corporation helps Mississauga and GTA entrepreneurs navigate business registration, structure selection, CRA compliance, and ongoing tax planning for small businesses. From your first registration to your annual tax return, we’re your complete accounting team.

Call 437-872-7399 or email info@pathakcpa.ca. Located at 48 Village Centre Place, Mississauga, Ontario.