Business Registration in Ontario: Step-by-Step Guide to Starting a Small Business (2026)

Starting a company is exciting, but business registration in Ontario is the step that makes everything official, legal, and bank-ready. Whether you are launching a home-based shop in Oakville, a consulting practice in Mississauga, or a trades business in Milton, getting your registration right the first time saves you from penalties, rejected loan applications, and CRA headaches later. This guide walks you through how to register a business in Ontario in 2026, covering business structures, costs, the CRA business number, GST/HST, and a simple checklist you can follow from day one.

Ontario business registration is not just a legal formality. It protects your business name, allows you to open a business bank account, lets you apply for financing or grants, and builds trust with customers and suppliers. Newer Ontario business requirements also link registration to tax reporting, so operating without proper paperwork can delay your GST/HST account, your business number, and even your ability to hire staff legally. For anyone starting a small business in Ontario, registration is the foundation everything else is built on.

Before you register a business in Ontario, you need to decide how it will be structured. This decision affects your taxes, liability, and paperwork, so it is worth comparing sole proprietorship vs corporation options carefully.

Sole Proprietorship Ontario

A sole proprietorship is the simplest and cheapest way to start a small business in Ontario. You and the business are legally the same entity, which means less paperwork but unlimited personal liability for business debts. This structure suits freelancers, consultants, and small local businesses just getting started.

Partnership Registration Ontario

If you are launching a business with someone else, a general or limited partnership may fit better. Partnership registration Ontario rules require you to register the business name and clearly define each partner’s responsibilities, profit sharing, and liability, ideally through a written partnership agreement.

Corporation Registration Ontario

Incorporating a business in Ontario creates a separate legal entity, which limits personal liability and can offer tax advantages as your revenue grows. Corporation registration Ontario involves more setup, including federal or provincial incorporation, but it is often the right long-term choice for businesses planning to scale, raise capital, or bring on partners.

Step 1: Choose and Search Your Business Name

Pick a name that reflects your brand, then run a NUANS name search to confirm it is not already taken. This is a required step for both sole proprietorships operating under a trade name and for corporations.

Step 2: Register with the Ontario Business Registry

Online business registration Ontario is handled through the Ontario Business Registry. Here you will register your sole proprietorship, partnership, or corporation, and receive a Master Business Licence or Articles of Incorporation depending on your structure.

Step 3: Get Your CRA Business Number

Once provincially registered, apply for a CRA business number registration. This nine-digit number is used across all your federal tax accounts, including corporate income tax, payroll, and GST/HST.

Step 4: Register for GST/HST

GST/HST registration Ontario is mandatory once your revenue passes $30,000 over four consecutive quarters, though registering earlier can help you claim input tax credits and appear more established to clients and suppliers.

Step 5: Apply for Municipal Licences and Permits

Depending on your industry and city, you may need additional business licenses Ontario requires locally, such as a municipal business licence, zoning approval, or industry-specific certification.

Step 6: Set Up Business Banking and Bookkeeping

Open a dedicated business bank account and set up bookkeeping from the start. Keeping personal and business finances separate is essential for tax filing, audits, and long-term small business compliance in Canada.

The cost to register a business in Ontario depends on the structure you choose. A sole proprietorship or general partnership generally costs around $60 through the Ontario Business Registry. Incorporating a business is more involved, with provincial incorporation fees typically in the $300 to $360 range, plus optional costs for a NUANS name search, legal review, or working with a business registration consultant.

Use this Ontario business registration checklist to keep your launch organized:

• Decide on your business structure (sole proprietorship, partnership, or corporation)
• Run a business name search and confirm availability
• Register your business name through the Ontario Business Registry
• Apply for your CRA business number
• Register for a GST/HST account if required
• Check for municipal licences or industry permits
• Open a business bank account
• Set up bookkeeping and a tax filing calendar

New business registration in Ontario looks a little different depending on your city. Entrepreneurs searching for business registration Oakville, business registration Mississauga, business registration Milton, or business registration Burlington often need local guidance on municipal permits, zoning, and industry licences in addition to provincial and federal registration. Working with a financial consultant Oakville businesses trust can help you navigate both the provincial paperwork and any city-specific requirements across the wider business registration GTA area.

TaxSquare PC (https://taxsquarepc.ca/) offers professional business registration services for entrepreneurs across Ontario, including sole proprietorships, partnerships, and full business incorporation Ontario support. As a CPA Oakville-based small business accountant and financial consulting team, TaxSquare PC helps with CRA business number setup, GST/HST registration, bookkeeping, and ongoing tax planning, so you can register your business correctly the first time and stay compliant as you grow. If you are ready to start a business in Ontario, their team can guide you through every step, from choosing a structure to filing your first tax return.

1. How much does it cost to register a business in Ontario?

A sole proprietorship or general partnership typically costs around $60 to register through the Ontario Business Registry, while incorporating a business generally costs $300 to $360 in government fees, plus any professional service fees.

2. Do I need to register my business in Ontario if I am a sole proprietor?

Yes, unless you operate strictly under your own legal name. If you use any other business name, Ontario requires you to register that name with the Ontario Business Registry.

3. How long does business registration in Ontario take?

Online registration through the Ontario Business Registry is usually completed within minutes to a few business days, while incorporation and CRA business number setup can take a little longer depending on how the application is filed.

4. Do I need a GST/HST number when I start a business in Ontario?

You must register for a GST/HST account once your business earns more than $30,000 in revenue over four consecutive calendar quarters, although many businesses register earlier for credibility and input tax credits.

5. Should I hire a professional for business registration in Ontario?

You can register a business on your own, but working with an experienced accountant or business registration consultant, such as TaxSquare PC, helps you choose the right structure, avoid compliance mistakes, and set up your tax accounts correctly from day one.