Professional Corporation Ontario: 2026 Complete Guide
A professional corporation in Ontario lets a regulated professional — physician, lawyer, accountant, dentist, pharmacist, social worker, veterinarian and others — practise through a corporation instead of personally, opening the door to the small business deduction, income timing and other planning tools their accountant can quantify. The framework sits in sections 3.1 to 3.4 of Ontario's Business Corporations Act (OBCA), which permits members of specific regulated professions to incorporate, subject to conditions their own regulator enforces.
The single most important thing to understand is that an Ontario professional corporation is a two-step product. Step one is incorporating at the Ontario Business Registry with articles that satisfy your regulator. Step two is obtaining that regulator's permit — in Ontario, usually called a certificate of authorization — before the corporation may practise. Both then renew on their own annual tracks. Miss either and the structure stops working.
Who can form a professional corporation in Ontario
The OBCA extends professional incorporation to professions governed by the Law Society Act, the Chartered Professional Accountants of Ontario Act, the Social Work and Social Service Work Act, 1998, the Veterinarians Act, and the health professions regulated under the Regulated Health Professions Act, 1991 — the last group operating under O. Reg. 665/05 (Health Profession Corporations). Each profession's college or law society issues the authorization and polices names, shares and renewals.
| Profession | Regulator | Authorization document | Guide |
|---|---|---|---|
| Physicians and surgeons | College of Physicians and Surgeons of Ontario (CPSO) | Certificate of authorization | Medicine professional corporation guide |
| Lawyers and paralegals | Law Society of Ontario (LSO) | Certificate of authorization | Law professional corporation guide |
| Dentists | Royal College of Dental Surgeons of Ontario (RCDSO) | Certificate of authorization | Guide coming soon |
| Pharmacists | Ontario College of Pharmacists (OCP) | Certificate of authorization | Guide coming soon |
| Chartered Professional Accountants | CPA Ontario | Professional corporation registration | Guide coming soon |
| Social workers / social service workers | OCSWSSW | Certificate of authorization | Guide coming soon |
| Veterinarians | College of Veterinarians of Ontario (CVO) | Certificate of authorization | Guide coming soon |
Other regulated health professionals — audiologists, massage therapists, optometrists, physiotherapists, chiropractors and more — incorporate under the same O. Reg. 665/05 framework through their own colleges. Our dentistry, pharmacy and CPA guides are on the way; the process below applies to all of them in outline.
The common process
Step 1 — incorporate at the registry. Every Ontario professional corporation starts as an OBCA corporation filed through the Ontario Business Registry. Because a professional corporation cannot use a number name, you order an Ontario-biased NUANS name search report for your proposed name, prepare articles of incorporation containing the share restrictions and business-restriction wording your regulator requires, and file. The government fee for articles of incorporation is $300, with online filings processed immediately and mailed filings taking around 15 business days.
Step 2 — get the regulator's authorization. The corporation then applies to the college or law society for its certificate of authorization (or registration, for CPAs). Applications typically ask for proof of incorporation — a copy of the certificate of incorporation, sometimes a certificate of status, which we can pull for you through a corporate profile report order — plus shareholder details and the regulator's fee. Only once the certificate is issued may the corporation practise the profession.
Then keep both alive. The corporation files its annual return through the Ontario Business Registry within six months of its fiscal year-end, and renews the regulator's certificate every year on that regulator's schedule. Our renewals and compliance guide walks through both tracks.
Naming rules in Ontario
The OBCA sets the baseline: the name must include the words "Professional Corporation" or "Société professionnelle", and a numbered name is not allowed. On top of that, health profession corporations under O. Reg. 665/05 follow a strict format — the surname of one or more shareholders who are members of the college (given names or initials optional), the health profession practised, and "Professional Corporation", with nothing else. "Smith Medicine Professional Corporation" passes; "Smith Medical Group Professional Corporation" does not. Law and accounting corporations have more latitude in the descriptive part of the name, but the law society still requires names that are accurate, verifiable and not misleading. Get the name wrong in your articles and you will be filing articles of amendment before the regulator will issue anything — so it pays to have the name vetted before the NUANS report is ordered.
PC vs regular corporation
A professional corporation is a standard OBCA corporation with extra conditions bolted on. Tax treatment is essentially at parity with any other Canadian-controlled private corporation — the small business deduction and deferral opportunities work the same way, which is precisely why professionals incorporate (confirm the numbers for your situation with your accountant). The differences are all restrictions:
- Business scope. A professional corporation may only carry on the practice of the profession, plus related or ancillary activities. A regular corporation can do anything lawful.
- Shareholders. Voting shares must be held by licensed members of the profession. Family non-voting shares exist only where a regulation allows them — physicians and dentists, yes; lawyers, no.
- Directors and officers. They must be shareholders, which in practice means licensed members.
- Liability. Section 3.4 of the OBCA says incorporation does not limit professional liability. The corporate shield still works for ordinary commercial debts, like a lease, but not for negligence in practice.
- Oversight. The corporation itself answers to the regulator, and shareholder changes usually trigger notice obligations.
Frequently asked questions
Who can set up a professional corporation in Ontario?
Members of professions the OBCA lists: lawyers and paralegals, Chartered Professional Accountants, social workers and social service workers, veterinarians, and the health professions regulated under the Regulated Health Professions Act — including physicians, dentists, pharmacists, optometrists and physiotherapists. Each profession's regulator must authorize the corporation before it can practise, so eligibility ultimately runs through your college or law society.
How much does a professional corporation cost in Ontario?
Budget for both steps. The Ontario Business Registry charges $300 to file articles of incorporation, plus the cost of an Ontario-biased NUANS name report. The regulator's fee comes on top and varies — CPSO charges $400 to apply and $175 to renew a certificate of authorization annually. Legal, accounting and service-provider fees are additional.
Do I incorporate first or apply to my regulator first?
Incorporate first — the regulator needs an existing corporation, with compliant articles, before it can issue a certificate of authorization. But confirm the regulator's naming and article requirements before you file, because articles that miss the required wording or name format must be amended before authorization will be granted.
Can my family own shares in my Ontario professional corporation?
Only in professions where a regulation allows it. Under O. Reg. 665/05, physicians and dentists may issue non-voting shares to a spouse, child or parent. Most other professions — including law, accounting, social work and veterinary medicine — restrict all shares to licensed members of the profession.
Does a professional corporation protect me from being sued?
Not for professional negligence. OBCA section 3.4 expressly preserves your personal professional liability, and regulators require insurance as usual. The corporation does provide the normal corporate advantages for commercial matters — contracts, leases and trade debts — alongside its tax-planning role.
Do professional corporations file annual returns in Ontario?
Yes. Like every Ontario corporation, a professional corporation files an annual return through the Ontario Business Registry within six months of its fiscal year-end, and must keep its registered office and director information current. Separately, the regulator's certificate of authorization renews annually on the regulator's own schedule and fee.
Incorporate your Ontario professional corporation — free consultation
Two filings, one deadline-proof plan. In a free consultation, a Corporate Registry Services specialist maps both steps for your Ontario practice — the registry incorporation with regulator-compliant articles and naming, and the regulator authorization that lets you practise through it — plus the annual renewals that keep both alive.
Related guides
Frequently asked questions
Who can set up a professional corporation in Ontario?
Members of professions the OBCA lists: lawyers and paralegals, Chartered Professional Accountants, social workers and social service workers, veterinarians, and the health professions regulated under the Regulated Health Professions Act — including physicians, dentists, pharmacists, optometrists and physiotherapists. Each profession's regulator must authorize the corporation before it can practise, so eligibility ultimately runs through your college or law society.
How much does a professional corporation cost in Ontario?
Budget for both steps. The Ontario Business Registry charges $300 to file articles of incorporation, plus the cost of an Ontario-biased NUANS name report. The regulator's fee comes on top and varies — CPSO charges $400 to apply and $175 to renew a certificate of authorization annually. Legal, accounting and service-provider fees are additional.
Do I incorporate first or apply to my regulator first?
Incorporate first — the regulator needs an existing corporation, with compliant articles, before it can issue a certificate of authorization. But confirm the regulator's naming and article requirements before you file, because articles that miss the required wording or name format must be amended before authorization will be granted.
Can my family own shares in my Ontario professional corporation?
Only in professions where a regulation allows it. Under O. Reg. 665/05, physicians and dentists may issue non-voting shares to a spouse, child or parent. Most other professions — including law, accounting, social work and veterinary medicine — restrict all shares to licensed members of the profession.
Does a professional corporation protect me from being sued?
Not for professional negligence. OBCA section 3.4 expressly preserves your personal professional liability, and regulators require insurance as usual. The corporation does provide the normal corporate advantages for commercial matters — contracts, leases and trade debts — alongside its tax-planning role.
Do professional corporations file annual returns in Ontario?
Yes. Like every Ontario corporation, a professional corporation files an annual return through the Ontario Business Registry within six months of its fiscal year-end, and must keep its registered office and director information current. Separately, the regulator's certificate of authorization renews annually on the regulator's own schedule and fee.
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