How to Start a Business in Ontario: The Ultimate Step-by-Step Guide

To start a business in Ontario, validate your idea, choose a legal structure (sole proprietorship, partnership, or corporation), register through the Ontario Business Registry or incorporate federally with Corporations Canada, get a Business Number from the CRA with HST and payroll accounts, open a business bank account, secure any required licences, and stay current with annual filings.

Starting a business in Ontario gives you access to one of North America's largest economies, a multilingual workforce, and a clear legal framework for everything from a one-person consultancy to a venture-backed corporation. The process is more straightforward than most founders expect -- as long as you take the legal and tax steps in the right order. This guide walks you through every stage, from idea validation to your first annual return, and shows when federal incorporation in Canada or Ontario business registration is the right move.

Step 1: Validate Your Business Idea Before You Register

The most expensive mistake new founders make is registering a legal entity before they know whether the business will work. Restructuring later -- moving from a sole proprietorship to a corporation, changing share classes after investors arrive, or unwinding a partnership -- costs far more than getting it right the first time.

Market research: Define who your customer is, what they want, and what they currently spend money on to solve the problem you're solving. Use surveys, customer interviews, online reviews of competitors, and search-volume data to confirm there is real demand.

Competitor analysis: Identify direct and indirect competitors. Map their pricing, positioning, strengths, and weaknesses. The goal is to find a gap you can credibly fill.

Feasibility assessment: Estimate startup costs, ongoing expenses, expected revenue, and the time it will take to break even. Stress-test the numbers. If the model only works at best-case assumptions, refine it before committing.

Validate the idea on a small scale -- a landing page, a pre-sale, a few paying pilot customers -- before you incorporate, sign a lease, or hire anyone.

Step 2: Choose the Right Business Structure for Starting a Business in Ontario

Ontario recognizes four main business structures. The right one depends on your liability tolerance, tax situation, growth plans, and whether you'll bring on co-founders or investors.

Key decision drivers:

• Liability: A corporation is a separate legal person. If the business is sued or incurs debt, the shareholders' personal assets are generally protected. A sole proprietor or general partner has no such shield.
• Tax: Active business income earned by a Canadian-controlled private corporation may qualify for the federal and Ontario small business deduction, often producing a combined corporate tax rate in the low double digits on the first $500,000 of qualifying income. Sole proprietors are taxed at personal marginal rates.
• Investors and lenders: Most equity investors will only invest in a corporation. Banks may extend more favourable credit to incorporated businesses with audited financial statements.
• Compliance cost: Sole proprietorships have minimal annual filings. Corporations require annual returns, minute book maintenance, and (typically) accountant-prepared T2 corporate tax returns.

If you plan to scale, raise capital, hire employees, or limit personal exposure, a corporation is usually the right choice.

Step 3: Decide Between Federal and Provincial Incorporation in Canada

If you choose to incorporate a business in Canada, your next decision is jurisdiction. Federal incorporation is governed by the Canada Business Corporations Act (CBCA). Ontario provincial incorporation is governed by the Ontario Business Corporations Act (OBCA).

The short answer on federal vs provincial incorporation: if your business will operate primarily in Ontario, provincial incorporation is usually cheaper and simpler. If you plan to operate across Canada or want exclusive use of your name nationwide, federal incorporation is worth the additional cost and compliance work.

Step 4: Choose and Register Your Business Name in Ontario

A strong business name is unique, memorable, and legally available.

For corporations, you have two options:

• Named corporation: Choose a distinctive name. Federally, you'll need a NUANS (Newly Upgraded Automated Name Search) report showing your proposed name does not conflict with existing corporate names or trademarks. Ontario also requires an Ontario-Biased NUANS search for OBCA incorporations.
• Numbered corporation: Skip the name search and let the government assign a number, such as "1234567 Ontario Inc." You can register a trade name later. This is faster and cheaper if branding isn't urgent.

For sole proprietorships and partnerships, you must register your business name with the Ontario Business Registry under the Business Names Act unless you operate strictly under your own legal name. Registration lasts five years and is renewable.

Important distinction: Registering a business name is not the same as registering a trademark. A business-name registration tells the government you exist; a trademark (registered with the Canadian Intellectual Property Office) gives you exclusive rights to use the name and logo nationally for the goods and services you sell. If your brand matters, plan for both.

Step 5: File Your Ontario Business Registration or Articles of Incorporation

For sole proprietorships and partnerships: Register the business name through the Ontario Business Registry (OBR), the online portal that has handled most Ontario business registration filings since October 19, 2021. You will receive a Business Identification Number (BIN) for your records.

For corporations, the incorporation package typically includes:

1. Articles of Incorporation -- the founding document. It sets out the corporate name, registered office address, share structure, any restrictions on share transfers, the number (or minimum and maximum number) of directors, and any restrictions on the business the corporation can carry on.
2. Notice of Directors / Initial Return -- names and addresses of the first directors. For federal incorporations, residency information is required.
3. Registered office address -- a physical address in Ontario (for OBCA) or the chosen province (for CBCA). A P.O. box is not acceptable. This is where official notices, court documents, and statutory mail are delivered.
4. Bylaws -- the internal rules governing how the corporation operates: how directors meet, how officers are appointed, how shareholders vote, how the books are kept.
5. Organizational resolutions -- the first set of resolutions, signed by the directors, appointing officers, issuing shares to the founding shareholders, designating the corporation's bank, and setting the fiscal year-end.
6. Share certificates and registers -- physical or digital share certificates issued to founders and the corporate registers (directors register, shareholders register, transfers register) that track ownership over time.
7. Minute book -- the binder (or digital equivalent) that holds all of the above. Every Ontario corporation is legally required to maintain a minute book.

Where to file:

• Federal (CBCA): Corporations Canada online filing centre.
• Provincial (OBCA): Ontario Business Registry. The OBR replaced the older paper and ServiceOntario filing channels in 2021.

Most filings are completed online and processed within hours to a few business days.

Step 6: Get Your Business Number and Tax Accounts from the CRA

Once you are registered or incorporated, the Canada Revenue Agency assigns your Business Number (BN) -- a 9-digit identifier that anchors all of your federal tax program accounts.

Required and optional tax accounts:

• GST/HST account (RT): Required when your worldwide taxable supplies exceed $30,000 in any single calendar quarter or in four consecutive calendar quarters (the "small supplier" threshold). Below the threshold, registration is voluntary -- but voluntary registration lets you claim input tax credits on business purchases. Ontario applies the 13% Harmonized Sales Tax.
• Payroll account (RP): Required before you cut your first paycheque. You will remit Canada Pension Plan (CPP) contributions, Employment Insurance (EI) premiums, and income tax deductions on a monthly, quarterly, or accelerated schedule depending on payroll size.
• Corporate income tax account (RC): Created automatically when you incorporate federally; you may need to register with the CRA after incorporating provincially.
• Import/export account (RM): Required if you will be importing goods into Canada or exporting commercial goods.

Provincial accounts to consider:

• Workplace Safety and Insurance Board (WSIB): Most Ontario employers are required to register and pay premiums.
• Employer Health Tax (EHT): Applies to Ontario employers when total Ontario payroll exceeds the annual exemption threshold (currently $1 million for eligible employers).
• Retail Sales Tax (RST): Still applies to certain transactions in Ontario, including insurance premiums and private vehicle transfers.

Setting up the right tax accounts at the start prevents a CRA notice later that you should have been collecting HST or remitting payroll deductions for the past two years.

Step 7: Open a Business Bank Account

A business bank account keeps personal and business finances separate -- and that separation matters legally and practically.

Why it matters legally: Commingling personal and business funds is one of the factors a court considers when deciding whether to "pierce the corporate veil" and hold a shareholder personally liable for corporate debts. Even for sole proprietors, a clean business account makes audit defence and bookkeeping dramatically easier.

What you'll need:

• Sole proprietorship or partnership: Business name registration / BIN, valid government ID for each owner, partnership agreement (for partnerships).
• Corporation: Articles of Incorporation, certificate of incorporation, directors' resolution authorizing the bank account and signing officers, government ID for each signing officer, and the corporation's minute book may be requested.

You do not need to be a Canadian citizen or resident to open a Canadian business bank account, but non-residents typically need to attend a branch in person and provide additional documentation. Some online business banking platforms now offer faster account opening with reduced in-person requirements.

Step 8: Get Your Licences and Permits

Licensing requirements vary widely by industry and municipality. A solo software consultant working from home in Toronto may need only a corporate registration. A restaurant in the same city may need a municipal business licence, a public health permit, a liquor licence from the AGCO, a sign permit from the city, and provincial food handler certification.

Tools and authorities to check:

• BizPaL (https://bizpal.ca/) -- a free federal/provincial/municipal tool that lists the permits and licences required for your specific business type and location.
• City of Toronto -- Municipal Licensing & Standards -- for Toronto-based businesses needing local licensing.
• Alcohol and Gaming Commission of Ontario (AGCO) -- liquor, cannabis, and gaming licences.
• Professional regulators -- Law Society of Ontario, CPA Ontario, Professional Engineers Ontario, etc., for regulated professions.

Keep copies of every approval, licence, and permit in your records. Regulators do follow up.

Step 9: Set Up Operations -- Plan, Online Presence, and Hiring

Write a business plan

Even if you are not raising capital, a written business plan forces you to articulate your model. A complete plan includes an executive summary, company overview, market analysis, sales and marketing strategy, operations plan, organizational structure, and financial forecasts (income statement, balance sheet, and cash-flow projection for at least the first 12 months). Be conservative on revenue and generous on expenses -- bankers and investors look for realism, not optimism.

Build your online presence

• Domain name: A .ca domain signals Canadian credibility and is restricted under CIRA's Canadian Presence Requirements -- a registered Ontario business or Canadian citizen / permanent resident qualifies.
• Website: A simple, clear website with your services, contact information, and a privacy policy is the minimum baseline. Ontario's Accessibility for Ontarians with Disabilities Act (AODA) imposes accessibility requirements on certain businesses; build to AODA standards from day one to avoid costly retrofits.
• Google Business Profile: Free, essential for local discovery, and the foundation of local SEO.
• Social media: Choose platforms based on where your customers spend time, not where you personally spend time. Consistency beats volume.

Hire your first employees

Ontario employment is governed primarily by the Employment Standards Act, 2000 (ESA) and the Occupational Health and Safety Act (OHSA). Key obligations:

• Written employment agreements are strongly recommended over verbal contracts. A written agreement should set out the position, compensation, hours, vacation, termination provisions, and any restrictive covenants. Termination clauses must comply with the ESA -- a clause that contracts out of ESA minimums is void.
• Minimum age: 14 for most workplaces, with restrictions on hours and types of work for minors under 18.
• Mandatory deductions: CPP, EI, and federal/Ontario income tax withheld from each paycheque and remitted to the CRA through your payroll account.
• WSIB coverage: Most employers must register and pay premiums based on payroll and industry classification.
• Workplace safety: Posters required by the Ministry of Labour, mandatory health and safety policies, and a Joint Health and Safety Committee for workplaces with 20 or more workers.
• Worker vs. independent contractor classification: Misclassification is a major audit risk. The CRA applies a control, ownership of tools, chance of profit, and risk of loss test. Treating an employee as a contractor exposes the business to back-taxes, penalties, and ESA liabilities.

Step 10: Stay Compliant -- Ongoing Legal Obligations

The legal work does not end at incorporation. Ontario corporations have ongoing obligations that, if missed, can lead to penalties, loss of good standing, or even involuntary dissolution.

Annual returns:

• Federal corporations must file an annual return with Corporations Canada within 60 days of the corporation's anniversary date. This is separate from the corporate income tax return filed with the CRA. Failing to file for one year can lead to dissolution.
• Ontario corporations file an annual return through the Ontario Business Registry. Since 2021, the Ontario annual return is filed separately from the CRA T2 return.

Annual shareholder meetings: At least one per year. The directors must call the meeting; shareholders pass resolutions on major decisions (election of directors, appointment of auditor, approval of financial statements). Closely held corporations often handle this with written consent resolutions in place of an in-person meeting.

Individuals with Significant Control (ISC) register: Federal corporations have been required since June 13, 2019 to maintain a register of individuals with significant control (generally, anyone who owns or controls 25% or more of the shares or votes). Amendments effective January 22, 2024 require federal corporations to file ISC information with Corporations Canada, and certain information became publicly searchable.

Minute book maintenance: Update the minute book whenever directors, officers, or shareholders change, when shares are issued or transferred, when bylaws are amended, or when major corporate decisions are made. A well-maintained minute book is essential at sale or financing -- buyers' lawyers will refuse to close until the minute book is current.

Corporate income tax (T2): Filed annually with the CRA, typically due six months after the fiscal year-end. Tax is generally payable two or three months after year-end depending on the corporation's status.

HST returns: Filed monthly, quarterly, or annually depending on revenue. Annual filing is allowed below specified thresholds; larger registrants must file more frequently.

Payroll remittances: Monthly, quarterly, or accelerated based on the average monthly withholding amount.

Notices of Change: File a Notice of Change within 15 days of any change to directors, officers, or registered office.

Record retention: Accounting records must be kept for at least six years from the end of the year to which they relate (CRA rule). Corporate records (minute book, registers, articles, bylaws) must be kept permanently.

Common Mistakes to Avoid When Starting a Business in Ontario

• Commingling personal and business funds in a corporation -- a major factor in piercing the corporate veil.
• Skipping the shareholder agreement when there are two or more shareholders. Without one, the OBCA defaults govern, and they may not match your intentions on share transfers, deadlocks, or buy-outs.
• Missing the $30,000 HST threshold and continuing to invoice without HST. The CRA will assess back-HST plus penalties and interest.
• Misclassifying employees as independent contractors. The CRA applies a multi-factor test; getting it wrong is expensive.
• Missing the annual return deadline. Federal corporations face dissolution after one year of non-filing.
• Using a P.O. box as the registered office. Not allowed -- official documents must be delivered to a physical address.
• Letting the minute book drift. Catching up years of missed resolutions during a sale closing is painful and costly.

Frequently Asked Questions

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

Costs vary by structure. A sole proprietorship business name registration through the Ontario Business Registry costs approximately $60 for a five-year term. Provincial incorporation through the OBR is roughly $300, and federal incorporation through Corporations Canada is approximately $200. Add NUANS report fees and any industry-specific licensing. Most founders spend between $500 and $2,500 to get fully set up.

Do I need a lawyer to incorporate in Ontario?

You can incorporate yourself through the Ontario Business Registry or Corporations Canada online. However, if you have co-founders, plan to issue different share classes, expect to raise capital, or want a properly drafted shareholder agreement and minute book, a corporate lawyer prevents costly mistakes that are far more expensive to fix later.

How long does it take to incorporate a business in Canada?

Online provincial incorporations through the Ontario Business Registry are typically processed within hours to a few business days. Federal incorporations through Corporations Canada are often completed within one business day for online filings. Add additional time for a NUANS report (usually same-day) or for lawyer-prepared share structure and organizing documents.

When do I have to register for HST in Ontario?

You must register for HST when your worldwide taxable supplies exceed $30,000 in any single calendar quarter or in four consecutive calendar quarters. Below that threshold, you are a "small supplier" and registration is optional. Many businesses register voluntarily so they can claim input tax credits on business purchases.

Can a non-resident start a business in Ontario?

Yes. As of July 5, 2021, Ontario removed the Canadian residency requirement for OBCA directors, so a non-resident can incorporate provincially and serve as the sole director. Federal corporations under the CBCA still require at least 25% of directors to be Canadian residents. Non-residents should consult a tax advisor on Canadian tax obligations.

What is a NUANS report?

A NUANS (Newly Upgraded Automated Name Search) report is a Canada-wide search of corporate names and trademarks. It is required for federally incorporated named companies and for Ontario-named OBCA corporations to confirm your proposed name does not conflict with existing names. The report is typically valid for 90 days.

Should I incorporate as a numbered company or a named company?

A numbered company (e.g., "1234567 Ontario Inc.") is faster and cheaper because you skip the name-search step. You can always register a trade name later for branding. Choose a named company if your business name is part of your identity from day one and you want it locked in at incorporation.

What ongoing filings does an Ontario corporation need?

An Ontario annual return through the Ontario Business Registry, federal annual return through Corporations Canada within 60 days of anniversary (if federally incorporated), annual shareholder meeting resolutions, T2 corporate income tax return six months after fiscal year-end, HST returns on the assigned schedule, payroll remittances if you have employees, ISC register updates (federal), and Notices of Change within 15 days of director or office changes.

Contact Hadri Law

If you are ready to incorporate, choose between federal and provincial registration, draft a shareholder agreement, or set up a minute book that will stand up at financing or sale, Hadri Law can guide you through every step. Our corporate team -- led by Nassira El Hadri (Founder and M&A, Corporate & Commercial Lawyer), with Nicholas Dempsey (Corporate Lawyer with experience on 90+ asset and share sale transactions) and Martina Caunedo (Tax Lawyer with 12+ years of international tax experience) -- provides boutique attention with big-firm calibre.

Book a free consultation to talk through your business structure, incorporation jurisdiction, share design, and ongoing compliance plan.

• Phone: (437) 974-2374
• Office: First Canadian Place, 100 King Street West, Suite 5700, Toronto, ON
• Calendly: calendly.com/hadrilaw/free-consultation
• Languages: English, French, Spanish, Catalan -- bridging the North American, European, and African markets.