Should I incorporate? A guide for Ontario business owners

Start with why you are asking

Owners usually raise incorporation for one of three reasons: a tax question, a liability concern or a customer, lender or licensing body that expects a corporation. Each reason points to a different analysis. Write down which one applies to you before comparing structures, because a corporation that solves a liability problem may do little for the tax bill, and the reverse.

A corporation is a separate legal person. It owns the business assets, signs the contracts, files its own return and pays its own tax. You become a shareholder, a director and, in most owner-managed companies, an employee. That separation is the source of both the advantages and the ongoing obligations described below.

The estimator at /tools/should-i-incorporate is a way to organize the numbers, not a decision. Use it to see which inputs matter most for your situation, then bring those inputs to a professional.

Deferral and integration

The CRA’s corporation tax rates page lists a federal net rate of 9% for Canadian-controlled private corporations claiming the small business deduction, and a lower Ontario rate of 3.2%, on active business income up to the business limit. Income above that limit, or that does not qualify, is taxed at the general rates on the same page. A sole proprietor, by contrast, adds all business profit to personal income in the year it is earned.

The corporate rate is lower than most personal marginal rates, but the difference is a deferral rather than a saving. Canada’s tax system is designed on the principle of integration: when the corporation eventually pays the after-tax profit to you as salary or dividends, personal tax applies, and the combined result is intended to be roughly similar to earning the income directly. The benefit of incorporating comes mainly from money you can afford to leave in the corporation, invested or used for growth, rather than from money you need to live on.

That is why the first estimator input is how much of the profit you need to withdraw each year. If you spend everything the business earns, the deferral is small and the added compliance cost may exceed it. If you can retain a meaningful portion, the arithmetic changes. Income from investments held inside the corporation follows different rules, so discuss any plan to accumulate a portfolio in the company.

The small business deduction, in outline

The small business deduction is what produces the lower rate. It applies to active business income of a Canadian-controlled private corporation, up to a business limit that the CRA page currently lists as $500,000 federally and in Ontario. Corporations that are associated with each other share the limit, and the limit can be reduced when taxable capital or passive investment income is high. Those reductions are outside this guide.

Do not assume every dollar of profit qualifies. Income from certain personal-services arrangements, specified investment businesses and some professional arrangements is treated differently. Describe how the business earns its revenue, who its clients are and whether any of them are effectively an employer, so the treatment can be confirmed before you rely on the lower rate.

Liability and what a corporation does not protect

Because the corporation is a separate person, its debts are generally its own. A shareholder’s exposure is normally limited to what was invested. That protection matters most for businesses with contracts, premises, employees or products that could give rise to claims.

The protection is narrower than many owners expect. Lenders and landlords often ask for personal guarantees, which put your own assets behind the corporation’s obligation. Directors can be held personally liable for certain unremitted amounts, including payroll source deductions and GST/HST. Professional negligence remains with the individual professional. Insurance, not incorporation, is usually the first answer to operational risk.

Costs and ongoing obligations

An Ontario corporation is created by filing articles of incorporation under the Business Corporations Act through the Ontario Business Registry, or federally through Corporations Canada, in which case it must also register in Ontario to carry on business here. Ontario corporations file an initial return after incorporation and an annual return each year within six months of the fiscal year-end, separate from any tax filing.

The CRA requires every resident corporation to file a T2 return for every tax year, even when no tax is payable, within six months of year-end. The corporation will usually need its own bank account, bookkeeping, payroll or dividend reporting, minute book and possibly financial statements for a lender. Compare those recurring costs, in time as well as fees, with the deferral you expect. This guide does not quote fees; ask for a written proposal that lists what is included.

Consider the exit as well. Moving an existing business into a corporation, selling shares rather than assets, and winding a corporation down all have tax consequences. A structure that is easy to enter is not always easy to leave.

Professional corporations

Regulated professionals in Ontario, including physicians, dentists, lawyers, accountants and others, may only incorporate their practice as a professional corporation under the rules of their governing body. Share ownership is typically restricted to members of the profession, and in some cases family members, and the corporation must hold a certificate of authorization from the regulator.

A professional corporation does not shield the professional from liability for their own professional acts. The tax analysis is otherwise similar to any other private corporation, with the same integration principle and the same question about how much income can be retained. Confirm the regulator’s requirements before filing anything with the registry.