How to Start a Business in Ontario: Steps, Requirements and Key Considerations

Starting a business in Ontario means setting up in Canada's most populous province and its largest economy. Whether you're looking to start a small business in Ontario or incorporate a growing venture, the province stands out for its streamlined administrative framework: a fully online business registry, a single sales tax, and a single corporate tax return for incorporated businesses.

What holds most entrepreneurs back isn't a lack of motivation. It's a lack of clarity: which steps are actually required, which business structure makes sense for their situation, and what obligations kick in from day one.

The corporate tax specialists at T2inc.ca walk you through every step of starting a business in Ontario — what's mandatory, what's optional, and what you need to understand before you launch, especially if you're considering incorporating your business.

1. Validate Your Idea and Study the Ontario Market

Before any forms or official steps, there's a more fundamental question: does your product or service address a real need in the market where you want to operate?

Ontario is not a uniform market. The entrepreneurial landscape in Toronto or Ottawa looks very different from Sudbury, Windsor, or Thunder Bay. What's in demand in one region may already be saturated in another. Conducting basic market research before assuming demand exists is a step many entrepreneurs skip — and one of the most common reasons early-stage businesses struggle to gain traction.

A few concrete questions are worth answering before moving forward:

• Does your product or service meet a real need in your target area? Local demand should be validated, not assumed.
• Who are your direct competitors in your region? Understanding their strengths and gaps helps you define your value proposition with precision.
• Is your sector concentrated in specific parts of Ontario? Finance and tech cluster around Toronto, government around Ottawa, manufacturing along the Oshawa-Windsor corridor, and natural resources in the North. Operating where your sector is active makes it easier to reach clients, partners, and talent.
• Is your sector specifically regulated in Ontario? Construction, healthcare, real estate, and several regulated professions have their own provincial bodies. Licensing and accreditation requirements can differ significantly from other provinces — and some are not automatically transferable.

Ontario's Small Business Enterprise Centres — present in 54 communities across the province — offer free one-on-one advisory support, workshops, and mentorship to help you work through this stage and move forward with confidence.

2. Write a Solid Business Plan

A business plan is often the first thing banks, the BDC, and provincial financing programs ask for before committing any capital. Beyond funding, it's the document that forces you to pressure-test your idea with real numbers — and anticipate the challenges you'll face before your first day of operations.

A strong business plan covers four areas:

• Business description: your mission, target clientele, and value proposition. In a market as competitive as Ontario's, what sets you apart needs to be explicit — not implied.
• Marketing and operational plan: distribution channels, pricing strategy, and intended organizational structure.
• Financial needs assessment: startup costs, working capital required for the first few months, and equipment needs.
• Financial projections: expected revenues, break-even point, and cash flow forecasts for the first 12 to 24 months.

The more grounded your plan is in real market data, the stronger your position when approaching lenders or applying for grants — both of which are widely available to Ontario entrepreneurs at the startup stage.

3. Choose the Right Legal Structure in Ontario

Choosing the right business structure is one of the most consequential decisions you'll make when starting a business in Ontario. It affects your personal liability, your tax obligations, and your ability to grow.

Four main structures are available:

• Sole proprietorship: the simplest and least expensive way to get started, but your personal assets are fully exposed to business debts.
• Partnership: two or more individuals operate a business together without incorporating. Each partner is personally liable for the debts of the business, including those incurred by the other partners. A written partnership agreement is strongly recommended from the start.
• Corporation: a separate legal entity from its shareholders, governed by the Ontario Business Corporations Act (OBCA). Personal liability is generally limited, and incorporated businesses may benefit from the Small Business Deduction on eligible active business income.
• Co-operative: suited to collective projects where members share ownership and decision-making. Governed in Ontario by the Co-operative Corporations Act.

Provincial vs. federal incorporation: a choice worth thinking through

If you opt for a corporation, you'll need to decide under which law to incorporate:

• Ontario Business Corporations Act — OBCA (provincial incorporation): name protection in Ontario only. Filed through ServiceOntario. The right choice for most small businesses in Ontario operating exclusively within the province.
• Canada Business Corporations Act — CBCA (federal incorporation, via Corporations Canada): name protection across Canada. The better fit if you plan to operate in multiple provinces or want national name recognition from the start.

The two options have distinct tax and administrative implications — notably the requirement for a federally incorporated company to register separately in Ontario as an extra-provincial corporation. Our article on federal vs. provincial incorporation covers both options in detail.

4. Choose and Verify Your Business Name

Your business name is more than a label — it's the first impression clients, partners, and institutions will have of your company. A strong registered business name should be distinctive, memorable, and available, meaning it isn't already in use by another business in the province.

In Ontario, no language restrictions apply to business names: a name in English, French, or any other language is valid, provided it follows a few basic rules. The name cannot be misleading, obscene, or include corporate abbreviations ("Inc.", "Ltd.") unless the business is actually incorporated.

One important caveat: registering a business name in Ontario does not grant exclusive rights to that name across Canada. For nationwide protection, you'll need to file a trademark with the Canadian Intellectual Property Office.

The NUANS report: required for named corporations

If you're incorporating an Ontario corporation with a custom name, you must obtain a NUANS name search report targeted to Ontario (also called a "biased" report, meaning the search is filtered to the Ontario market) before filing your articles of incorporation with ServiceOntario. This report, ordered through a private search firm, confirms that no other business is using an identical or similar name in the province.

Two things to keep in mind:

• A federal NUANS report is not accepted by ServiceOntario for a provincial incorporation.
• If you're incorporating a numbered company, no NUANS report is required.

For sole proprietors and partnerships, a free name search is available directly through the Ontario Business Registry before registering your name. It's a quick step that confirms availability and helps you avoid administrative delays down the line.

5. Register Your Business with the Ontario Business Registry

Registering with the Ontario Business Registry, managed by ServiceOntario, is done entirely online. Any entrepreneur operating under a name other than their own full legal name is required to register — as are all corporations and partnerships. Registration requirements and fees vary depending on your business structure.

Upon registration, ServiceOntario issues a Business Name Registration (formerly known as Master Business Licence), valid for five years. You'll also receive a Business Identification Number (BIN) — a nine-digit provincial identifier used for transactions with the Ontario government. Note that the BIN is distinct from the business number (BN) issued by the CRA for federal tax purposes — both numbers apply to your business and serve different functions.

Once registered, you can open a dedicated business bank account. Most Canadian financial institutions require proof of registration — your Business Name Registration or articles of incorporation — before opening an account. Keeping your business and personal finances separate from day one simplifies your bookkeeping and is essential come tax time.

6. HST in Ontario: One Tax, One Filing

Ontario applies a single sales tax: the Harmonized Sales Tax (HST), at a rate of 13% (5% federal GST + 8% provincial component). Unlike some other provinces, Ontario's HST is administered entirely by the Canada Revenue Agency (CRA) — one registration covers both the federal and provincial portions.

Registration becomes mandatory once your gross revenues exceed $30,000 in a single calendar year or over four consecutive quarters. Depending on your sector and the nature of your product or service, different rules may apply to your business — some supplies are zero-rated or exempt from HST entirely.

That said, registering voluntarily from the start allows you to claim Input Tax Credits (ITCs) — recovering the HST paid on purchases and expenses related to your operations. For a startup investing in equipment or services, that can add up quickly.

7. Obtain Your Permits and Licences

Not all businesses in Ontario require the same authorizations — but some sectors are heavily regulated, and the requirements that apply to your business vary by sector, municipality, and level of government. Getting this right before opening day avoids costly delays and compliance issues down the line.

A few sectors worth highlighting:

• Skilled trades and construction: regulated by Skilled Trades Ontario (STO). Certifications obtained in another province are not automatically recognized — verify Ontario's specific accreditation requirements before starting operations.
• Liquor service: licences fall under the Alcohol and Gaming Commission of Ontario (AGCO).
• Regulated professions: each profession has its own regulatory body in Ontario (CPA Ontario, the Law Society of Ontario, Professional Engineers Ontario). These bodies are distinct from their counterparts in other provinces, and credential recognition is not automatic.

The federal government's BizPaL tool generates a personalized list of permits and licences based on your sector and municipality.

Professional liability and business insurance

Business insurance is not legally required in most sectors, but it is frequently required contractually by clients, partners, and lenders. Professional liability insurance covers your business against claims arising from errors or omissions in your work. Before signing your first contract, confirm what coverage is expected — requirements vary significantly by sector and client type.

8. Funding and Grants for Starting a Business in Ontario

Ontario entrepreneurs have access to a range of financing programs at both the provincial and federal levels — from non-repayable grants to loans and mentorship. Eligibility criteria vary, so it's worth identifying early which programs may apply to your business.

• At the provincial level, the Starter Company Plus program offers advisory support, mentorship, and a non-repayable grant for eligible new entrepreneurs, delivered through Ontario's Small Business Enterprise Centres.
• At the federal level, FedDev Ontario (southern Ontario) and FedNor (northern Ontario) support small businesses through contributions and delivery partners, including Community Futures Development Corporations (CFDCs). Futurpreneur Canada offers financing, mentorship, and resources for entrepreneurs aged 18 to 39.

The BDC, chartered banks, and credit unions complement these programs with traditional financing products suited to businesses at any stage.

9. Key Obligations After Launch

Once your business is up and running in Ontario, several recurring obligations kick in — some from day one, others once specific thresholds are reached. Here are the main ones to keep on your radar:

• Annual return: corporations must file directly with the Ontario Business Registry. Since May 5, 2021, the CRA no longer accepts these filings on behalf of the province.
• HST returns: businesses registered for HST file with the CRA at the frequency established at registration — monthly, quarterly, or annually depending on your revenue volume.
• Source deductions: any business with employees must open a source deductions account with the CRA and remit income tax, employment insurance premiums, and Canada Pension Plan contributions on the schedule assigned based on your average monthly withholdings.
• T2 Corporation Income Tax Return: Ontario corporations file a single T2 return with the CRA — provincial tax is calculated within the same filing, due within six months of your tax year end. One filing, one tax authority.

Getting the right support in place early makes all of these obligations easier to manage — which is where the right professionals make a real difference.

10. Surround Yourself with the Right Professionals

Even in a province with one of the most streamlined administrative frameworks in Canada, the decisions you make early — on structure, tax planning, and compliance — have long-term consequences for your small business in Ontario. The right professionals help you get them right from the start.

• A CPA or tax specialist helps you choose the right business structure, set up your accounting system, and navigate your initial tax obligations. For Ontario corporations, T2inc.ca handles T2 filings entirely online, across Canada.
• A business lawyer is particularly valuable at incorporation, to define the rights and obligations of each shareholder in a shareholders' agreement, or in any regulated sector requiring solid commercial contracts. Pro Bono Ontario offers free legal advice by phone to small business owners.
• A startup advisor, through Ontario's Small Business Enterprise Centres, can support your business plan and funding applications at no cost.

The earlier you build this team, the more options you have.

Starting a Business in Ontario: Checklist

Use this checklist as a reference to track your progress and make sure nothing falls through the cracks:

Frequently Asked Questions — Starting a Business in Ontario

What do I need to open a small business in Ontario?

Opening a small business in Ontario requires five key steps: choosing a business structure, registering with the Ontario Business Registry (ServiceOntario), obtaining a business number (BN) from the Canada Revenue Agency (CRA), registering for HST if gross revenues exceed $30,000, and obtaining any permits or licences required for your sector.

How much does it cost to start a business in Ontario?

Starting a business in Ontario costs a minimum of $60 to $300 in government registration fees, depending on your business structure — $60 for a sole proprietorship or partnership, $300 to incorporate a provincial corporation through ServiceOntario. Additional costs vary by sector and include equipment, insurance, permits, and working capital for the first months of operations.

What is the difference between provincial and federal incorporation in Ontario?

In Ontario, entrepreneurs can incorporate under provincial or federal law. A provincial incorporation under the Ontario Business Corporations Act (OBCA) protects the business name in Ontario only and is filed through ServiceOntario. A federal incorporation under the Canada Business Corporations Act (CBCA), filed through Corporations Canada, protects the name across Canada but requires an additional extra-provincial registration with ServiceOntario for businesses operating in Ontario.

Does an Ontario corporation need to file a provincial tax return in addition to the T2?

No. Ontario corporations file a single T2 Corporation Income Tax Return with the Canada Revenue Agency (CRA). Since 2009, Ontario has delegated the administration of corporate income tax to the CRA, which calculates both federal and provincial tax within the same T2 return. This makes Ontario one of the few provinces where no separate provincial corporate tax return is required.

Ready to Launch Your Business in Ontario?

Ontario offers one of the most accessible frameworks in Canada for entrepreneurs looking to start a business: a fully online business registry, a single sales tax, and a single corporate tax return for incorporated businesses.

Getting the structure and tax planning right from day one is what separates a smooth launch from a costly correction down the road. The corporate tax accountants at T2inc.ca handle T2 filings for incorporated businesses across Canada, entirely online — contact our team for any questions about your tax obligations in Ontario.

This content is for informational purposes only and does not constitute tax or legal advice. Every corporation's situation is unique — we recommend consulting a qualified CPA before making any tax-related decisions.