What is a professional corporation and who can have one?

What a professional corporation actually is

A professional corporation is incorporated the same way as any other Ontario business corporation, under the Business Corporations Act. But a regulatory college layers additional rules on top: who can own shares, what the corporation can be named, and whether it can legally operate at all. The corporation is the vehicle for the professional's practice. The professional's actual licence to practise comes from the college and is unaffected by the corporate structure sitting around it.

Which professions in Ontario can incorporate this way

A wide range of regulated professions can form a professional corporation. That includes physicians, dentists, lawyers, public accountants, engineers, architects, veterinarians, chiropractors, registered massage therapists, and social workers, among others. Each profession's own regulatory college sets its own specific rules on top of the general Business Corporations Act framework. So the requirements for a medicine professional corporation differ in detail from those for a law corporation or an engineering corporation. The underlying incorporation mechanics, though, look similar.

How it differs from an ordinary business corporation

Mechanically, incorporating a professional corporation follows the same steps as any other Ontario business corporation. That means articles of incorporation filed through the Ontario Business Registry, and a proposed name cleared through a NUANS report unless you choose a numbered company. You also need at least one director. What sets it apart is entirely layered on top by the regulatory college, rather than by the Business Corporations Act itself. That's why two professional corporations in different fields can look quite different in their naming and ownership rules, despite being incorporated the same way.

The certificate of authorization requirement

Before, or shortly after, incorporating, the professional needs a certificate of authorization from their regulatory college. That certificate confirms the corporation is allowed to carry on the practice. The college also typically dictates naming rules. Often that requires the professional's own name to appear in the corporate name, along with a designation such as "Professional Corporation" or a profession-specific variant of it. Operating without a valid certificate of authorization, or letting one lapse, can put the professional's ability to bill or practise through the corporation at risk. That risk is separate from their personal licence status.

Why the corporate shield does not cover negligence

Incorporating protects the professional from ordinary business liabilities the corporation takes on. Think a lease default, a trade debt, or an employee's claim against the business. It does not protect the professional personally from liability for their own negligence or professional misconduct in the practice of their profession. Regulatory colleges and the courts hold the individual professional to the same standard of care, whether they bill through a corporation or not. This is the most common misunderstanding owners bring to us when considering incorporation for a licensed practice.

Who is allowed to own shares

Most colleges restrict voting shares in a professional corporation to members of the same profession. So a physician generally cannot simply add a non-physician spouse as a voting shareholder. Certain professions carve out an exception for specific family members to hold non-voting shares. Medicine and dentistry professional corporations are the most notable example, allowing limited family income-splitting structures within the college's rules. A family member holding non-voting shares still cannot control or vote on the corporation's affairs. Our physician incorporation page goes into this ownership structure in more detail for that profession specifically.

The tax treatment is the same as any other corporation

A professional corporation qualifies for the same tax mechanics as any other Canadian-controlled private corporation. That includes the small business deduction on active business income. If the corporation is ever sold, it may also have potential access to the lifetime capital gains exemption, subject to the usual qualifying conditions. The professional restrictions govern who can own the corporation and what it can be named, not how the Income Tax Act treats the income it earns. Owners weighing whether to incorporate their practice at all should also see our page on whether it makes sense to incorporate a small business in Ontario. The same tax-deferral logic applies.

This means a physician or lawyer weighing incorporation is really weighing the same trade-off as any other business owner. That means keeping more profit inside the corporation at the lower small business rate while it is not needed personally. It's weighed against the ongoing cost of a T2 return, a minute book, and an annual return. The professional-specific rules add the certificate of authorization and the ownership restrictions on top of that decision; they do not change the underlying math.

What happens if a professional stops practising or retires

A professional corporation generally cannot keep operating once the professional it was set up for stops practising or retires. That's also true if their licence is suspended. In each case, the corporation's certificate of authorization is tied to that individual's active standing with the college. Many professionals wind down or dissolve the corporation at that point. Some colleges, though, allow a limited window to hold remaining assets, such as investments accumulated inside the corporation, while the wind-down is arranged. This is worth planning for well before retirement, rather than treating it as a detail to sort out at the end. The timing can affect how existing retained earnings are eventually taxed on the way out.

How we handle this

We work with the regulatory college requirements alongside the standard incorporation process. Getting the certificate of authorization and naming rules right the first time avoids a rejected filing or a compliance letter from the college later. This is part of our incorporation and compliance work, and our dedicated physician incorporation service handles the medicine-specific rules in detail.