Starting a business in Ontario is more straightforward than most people think. This complete guide walks you through every step — from choosing your business structure to registering, collecting HST, and managing your finances.
The first decision every Ontario entrepreneur must make is what business structure to use. The three main options are sole proprietorship, partnership, and corporation — each with different legal, tax, and administrative implications.
A sole proprietorship is the simplest structure. You operate as an individual under your own name or a registered business name. There is no legal separation between you and the business — you are personally liable for all debts. Income is reported on your personal tax return. Registration costs approximately $60 for a business name or nothing if you operate under your own name.
A corporation is a separate legal entity from its owner. It provides personal liability protection — your personal assets are generally protected from business debts. Corporate tax rates in Ontario are lower than personal tax rates for income retained in the business. Incorporating in Ontario costs approximately $300 federally or $360 provincially. Annual maintenance costs including accountant fees make corporations more expensive to operate.
Registering a business in Ontario is done through the Ontario Business Registry at ontario.ca/businessregistry. The process is fully online and can be completed in under 30 minutes for most business types.
If you are operating as a sole proprietor under your own legal name, no registration is required in Ontario. If you want to use a business name (trading as or DBA), you must register that name for approximately $60. The registration is valid for 5 years and must be renewed.
Before registering your business name, search the Ontario Business Registry and NUANS (Newly Upgraded Automated Name Search) to ensure your chosen name is not already in use. A unique business name protects your brand and avoids legal complications with existing businesses.
Once registered, you will receive a Business Identification Number (BIN). If you incorporate, you receive a Business Number (BN) from the CRA which is used for all federal tax accounts including HST, payroll, and corporate income tax.
In Ontario, you must register for HST with the Canada Revenue Agency when your business revenue exceeds $30,000 in any calendar quarter or in the preceding four consecutive calendar quarters. Registration is optional below this threshold — you are considered a small supplier and do not need to collect or remit HST.
Once registered, you collect 13% HST on most goods and services sold in Ontario. You remit the collected HST to the CRA minus the Input Tax Credits (ITCs) for HST you paid on business expenses. This means HST is essentially neutral for registered businesses — you collect it from customers and recover what you paid to suppliers.
Registering for HST voluntarily before reaching $30,000 can be beneficial if you have significant business expenses — you can claim ITCs to recover HST paid on equipment, supplies, and services. However it adds administrative requirements including filing HST returns quarterly or annually.
One of the first and most consequential decisions a Canadian entrepreneur makes is how to legally structure the business. The three main options — sole proprietorship, partnership, and incorporation — each carry distinct tax, liability, and administrative implications that shape the business for years.
A sole proprietorship is the simplest and cheapest to start. Business income flows directly onto your personal tax return, taxed at your personal marginal rate. The major drawback is unlimited personal liability: there is no legal separation between you and the business, so business debts and lawsuits can reach your personal assets. This structure suits low-risk businesses with modest income in their early stages.
Incorporation creates a separate legal entity, providing limited liability protection and access to the small-business tax rate, which in Ontario combines federal and provincial rates to roughly 12.2% on the first $500,000 of active business income — far below personal rates. This allows profitable corporations to retain and reinvest earnings tax-efficiently. Incorporation also enables income splitting with family members and greater flexibility in how and when owners take income through salary or dividends. The trade-offs are setup and ongoing costs, separate corporate tax filings, and more administrative complexity.
Tax compliance is one of the areas where new Canadian business owners most often stumble, and understanding the basics prevents costly mistakes. The first key obligation is HST. Once your business exceeds $30,000 in gross revenue over four consecutive quarters, you must register for an HST number, charge HST on taxable sales (13% in Ontario), and remit it to the CRA, less any input tax credits you claim on business purchases.
Input tax credits are a crucial benefit: the HST you pay on legitimate business expenses can be recovered, so you effectively only remit the net difference between HST collected and HST paid. This is why many businesses register voluntarily even before reaching the threshold — it lets them recover HST on startup costs and equipment. Filing frequency (annual, quarterly, or monthly) depends on your revenue.
For income tax, sole proprietors report business income on their personal return and pay tax at personal rates, while corporations file a separate T2 corporate return. Both must make instalment payments if their tax owing exceeds certain thresholds, rather than paying in one lump sum at year-end. Setting aside a portion of every payment received — many businesses use 25% to 30% — into a separate tax account prevents the cash-flow crisis that hits unprepared owners at filing time.
Payroll adds another layer once you hire employees: you must withhold income tax, CPP, and EI from wages, remit them along with the employer's CPP and EI portions, and issue T4 slips annually. Many small businesses outsource payroll to a service or accountant precisely because the compliance requirements and penalties for errors are significant.
Cash flow — not profit — is what keeps a business alive, and managing it well is the single most important operational skill for a Canadian small business owner. A business can be profitable on paper yet fail because it runs out of cash to pay suppliers, rent, and wages while waiting for customers to pay. Understanding and forecasting cash flow prevents this common cause of business failure.
The practical foundation is a cash-flow forecast that projects money in and money out over the coming weeks and months. This reveals tight periods in advance, giving you time to arrange financing, accelerate collections, or delay non-essential spending. Invoicing promptly, following up on overdue accounts, and offering small incentives for early payment all improve the timing of cash inflows.
For funding, Canadian small businesses have several options. The Canada Small Business Financing Program helps businesses obtain loans from banks by sharing the lender's risk with the government. The Business Development Bank of Canada (BDC) offers loans and advisory services tailored to small businesses. Many businesses also rely on a line of credit for short-term cash-flow gaps, which is far cheaper than carrying balances on business credit cards. Grants and regional development programs exist for specific industries and regions, though they are competitive and often narrowly targeted.
The disciplined approach is to maintain a cash reserve covering at least two to three months of operating expenses, separate from day-to-day funds, as a buffer against slow periods, late-paying clients, or unexpected costs. Businesses that survive downturns are almost always the ones that built this cushion during good times rather than operating with no margin for error.
Q: Do I need a business license to start a business in Ontario?
A: It depends on your industry and location. Most businesses do not require a provincial license beyond business name registration. However specific industries including food service, childcare, construction trades, healthcare, and financial services require additional licenses or certifications. Check with your municipality as many businesses also require a local business license from their city or town.
Q: Can I run a business from my home in Ontario?
A: Yes. Home-based businesses are common and legal in Ontario. However your municipality may have zoning bylaws that restrict certain types of business activities in residential areas. Check with your local municipality before starting a home-based business that involves customers visiting your home, employees, or signage. You can also deduct a portion of your home expenses as business expenses if you have a dedicated workspace.
Q: What is the small business tax rate in Ontario?
A: The combined federal and Ontario small business tax rate on the first $500,000 of active business income earned by a Canadian-controlled private corporation is approximately 12.2% — significantly lower than personal income tax rates for most business owners. This low rate on retained business income is one of the main advantages of incorporating in Ontario once your business reaches a certain level of profitability.
Use our free Canadian salary and tax calculators to understand your take-home income as a business owner.
Try the Calculator →