By Raz Toor, Lawyer and Founder of Falcon Law PC
A professional corporation and an ordinary Ontario business corporation may look similar on a corporate search, but they are not interchangeable.
A regular corporation can generally carry on any lawful business permitted by its Articles. A professional corporation is designed for members of professions that Ontario law permits to practise through a corporation, and it operates within additional ownership, naming and regulatory restrictions.
That distinction matters for doctors, dentists, nurses, occupational therapists, psychologists, behaviour analysts, lawyers and other regulated professionals considering incorporation.
I’m Raz Toor, the founder of Falcon Law PC. We regularly advise professionals and healthcare businesses on incorporation, professional corporations, clinic structures and the agreements that sit around those corporations. One of the first questions is often whether the client actually needs a professional corporation at all.
What Is a Regular Ontario Corporation?
An ordinary Ontario business corporation is incorporated under the Business Corporations Act.
It is a separate legal entity from its shareholders. It can own property, enter contracts, hire employees, borrow money and operate a business in its own name.
For most entrepreneurs, this is the standard corporate structure.
The corporation can generally have a flexible ownership structure, subject to its Articles, shareholder agreements and applicable laws. Shareholders do not need to belong to a regulated profession simply because the corporation provides services to professionals or operates in the healthcare sector.
For broader corporate assistance, see our legal services for entrepreneurs and business owners.
What Is a Professional Corporation?
A professional corporation is also incorporated under Ontario’s Business Corporations Act, but it must satisfy the additional rules that apply to professional corporations and the particular profession involved.
Ontario law defines a professional corporation as a corporation incorporated or continued under the Ontario statute that holds the required certificate of authorization or other authorizing document from the body governing the profession.
In other words, incorporating the company is only one part of the process.
For a regulated health profession, the corporation will generally also need a Certificate of Authorization from the applicable regulatory College before it can practise the profession as a health profession corporation.
A Professional Corporation Is Generally an Ontario Corporation
This is an important structural difference.
A professional corporation under Ontario’s professional-corporation regime is incorporated or continued under the Ontario Business Corporations Act.
You cannot simply incorporate a federal company under the Canada Business Corporations Act and assume that it qualifies as an Ontario professional corporation.
For Ontario health profession corporations specifically, the Regulated Health Professions Act defines the corporation by reference to incorporation under the Ontario Business Corporations Act together with a valid Certificate of Authorization.
Ownership Is Much More Restricted
This is probably the most significant practical difference between a professional corporation and an ordinary corporation.
The general rule under Ontario’s Business Corporations Act is that the issued shares of a professional corporation must be owned, directly or indirectly, by members of the same profession.
The officers and directors must also generally be shareholders.
There are profession-specific exceptions and additional rules, so the ownership analysis should not be generalized across every profession. For example, medicine has rules permitting certain family-member ownership arrangements that do not necessarily apply to another health profession.
This becomes very important where a professional wants to operate a business with a spouse, investor or business partner who is not registered in the same profession.
Why This Matters for a Husband-and-Wife Business
Suppose a regulated professional wants to open a clinic with a spouse who is not a member of the same profession.
With an ordinary corporation, both spouses can generally be shareholders if the broader business structure permits it.
With a professional corporation, the applicable professional-ownership rules may prevent the non-professional spouse from holding voting shares or, depending on the profession, from owning shares at all.
That does not necessarily mean the spouses cannot build the business together. It means the corporate structure may need to separate the professional practice from the broader business or management operation.
The Corporation’s Business Activities Are Restricted
An ordinary corporation can generally carry on a broad range of lawful businesses unless its Articles contain a restriction.
A professional corporation is different.
Its Articles must generally provide that it will not carry on a business other than the practice of the applicable profession and activities related or ancillary to that professional practice.
That restriction matters in multidisciplinary businesses.
A corporation formed to practise one regulated profession should not automatically be treated as the vehicle through which unrelated professional services, retail businesses, technology products or other commercial ventures can be operated.
Professional Corporations Have Special Naming Rules
An ordinary Ontario corporation can often use a numbered name or a broad business name, subject to the ordinary corporate naming rules.
A professional corporation cannot use a numbered corporate name.
Its name must include “Professional Corporation” or the French equivalent and must also comply with any naming rules imposed by the profession.
For Ontario health profession corporations, the regulations generally require the corporate name to identify the profession and include the surname of one or more professional shareholders.
That is why names such as “ABC Health Inc.” and “Dr. Smith Medicine Professional Corporation” are not merely different branding choices. They may reflect fundamentally different legal structures.
The Regulatory College Remains Involved
An ordinary corporation is generally governed through the corporate registry and the laws applicable to its business.
A professional corporation also sits within the regulatory system governing the profession.
For a health profession corporation, the applicable College issues the Certificate of Authorization and may require annual renewal, updated shareholder information and ongoing compliance with its professional rules.
The professional does not escape College oversight by incorporating.
The corporation itself can also become relevant to the College’s regulatory process.
Does a Professional Corporation Protect You From Professional Negligence?
No. This is one of the most important misconceptions about professional corporations.
An ordinary corporation can provide shareholders with significant protection from ordinary corporate liabilities, subject to matters such as personal guarantees, statutory director liabilities and other exceptions.
A professional corporation does not eliminate the professional’s liability for professional negligence or other professional liability claims.
Ontario’s Business Corporations Act specifically provides that practising through a professional corporation does not limit a member’s professional liability.
The professional therefore remains responsible for the professional services they provide.
That is also why professional liability insurance remains important after incorporation.
Then Why Incorporate Professionally?
The primary reasons are usually business and tax planning rather than immunity from professional negligence.
A professional corporation can allow professional income and expenses to flow through a corporation, permit income to be retained within the corporation where appropriate, provide a framework for business ownership and succession, and create a more organized structure for the professional practice.
But incorporation does not automatically produce a tax advantage.
The tax outcome depends on the professional’s income, personal cash-flow needs, other corporations, family situation and future plans. Those issues should be reviewed with an accountant or tax adviser before deciding whether incorporation makes economic sense.
A Professional Corporation Does Not Automatically Own the Whole Clinic
This distinction becomes particularly important in healthcare.
A physician may practise medicine through a Medicine Professional Corporation while a separate ordinary corporation operates the broader clinic business.
The management corporation might lease the premises, employ administrative personnel, own non-clinical equipment and provide management services, while the professional corporation carries on the physician’s professional practice.
Whether that structure is appropriate depends on the profession, services, ownership and financial arrangements.
The important point is that the professional corporation and the clinic business do not always need to be the same corporation.
What About a Multidisciplinary Clinic?
Multidisciplinary clinics make this issue more complicated.
Suppose a business offers occupational therapy, psychotherapy, speech-language services, behavioural services and other healthcare services under one brand.
It would be risky to assume that one professional corporation can simply practise every profession represented inside the clinic.
Professional-corporation rules are tied to a particular regulated profession. The business therefore needs to distinguish between the corporation operating the clinic and the legal vehicle through which individual regulated professionals practise.
The answer can depend on whether those practitioners are employees, contractors, owners or independent professional businesses providing services through the clinic.
Sometimes an Ordinary Corporation Is the Better Answer
Being a regulated professional does not automatically mean that every business you own must be a professional corporation.
For example, the College of Nurses of Ontario expressly recognizes that a self-employed nurse may have different incorporation options, including an ordinary Ontario or federal corporation or, if appropriate, a CNO-authorized Health Profession Corporation.
The correct choice depends on what the corporation will actually do.
A nurse operating an independent nursing practice presents one structure. Two entrepreneurs, one of whom happens to be a nurse, operating a broader healthcare technology or clinic-management company may present another.
The corporate structure should follow the business model rather than the professional title alone.
A Recent 2026 Example
We recently advised on the proposed structure of an Ontario virtual clinic being launched by a nurse practitioner together with a non-nurse spouse.
One of the first questions was whether the business should operate through an ordinary Ontario corporation or through a CNO-authorized Health Profession Corporation.
That decision affected more than the incorporation documents. It affected who could own the corporation, how the professional services would be provided and which regulatory process would apply.
We therefore addressed the corporate structure before moving on to the clinic’s practitioner agreements, privacy documentation, patient-facing terms and other operational documents.
That sequencing is important. Preparing an entire set of contracts before confirming which corporation should actually be providing the services can result in unnecessary redrafting later.
The example above has been anonymized and certain details have been generalized to protect client confidentiality.
We Have Seen the Same Issue in Multidisciplinary Practices
In another 2026 healthcare matter, we reviewed a federally incorporated multidisciplinary clinic that included regulated behavioural and therapy services.
The corporate review identified an important distinction between the existing federal business corporation and the separate professional-corporation requirements applicable to regulated practitioners providing their professional services through a corporation.
The issue could not be answered merely by looking at the corporation’s Articles. We needed to understand who actually owned the business, which professionals were providing services, how they were engaged and how the clinic billed for those services.
That is a recurring theme in professional-corporation work: the legal structure has to match how the practice actually operates.
This example has also been anonymized and generalized to protect client confidentiality.
Can You Convert an Existing Regular Corporation Into a Professional Corporation?
Sometimes the structure can be reorganized, but it should not be approached as simply changing the company’s name.
The corporation must satisfy the applicable professional-corporation requirements. That can require amendments to the Articles, changes to share ownership, changes to directors and officers, an appropriate corporate name and approval from the regulatory body.
Where the existing corporation has non-professional shareholders, unrelated business activities or a federal charter, a new Ontario professional corporation may be the cleaner solution.
Tax advice should also be obtained before moving an existing practice, assets or goodwill from one corporation to another.
Can Several Professionals Own One Professional Corporation?
Potentially, where the applicable rules permit it and the shareholders belong to the same profession.
When several professionals own the corporation together, I would also consider the shareholder relationship itself.
The regulatory rules determine who is permitted to own the corporation. They do not answer commercial questions such as what happens if one owner stops practising, wants to retire, becomes disabled, loses registration or wants to sell their interest.
Those issues may need to be addressed through a properly drafted shareholder agreement and the corporation’s governing documents.
Do You Still Need a Minute Book?
Yes.
A professional corporation remains a corporation.
It should have proper organizational resolutions, share issuances, registers and ongoing corporate records just like another Ontario corporation.
The professional-regulatory requirements sit on top of those ordinary corporate obligations rather than replacing them.
Professional Corporation or Regular Corporation?
There is no universal answer.
The right starting point is to ask what services the corporation will provide, who needs to own it, whether non-professional investors or family members will be involved, whether the business is multidisciplinary and whether the professional actually intends to practise their regulated profession through the corporation.
From there, the requirements of the particular College or profession can be applied to the proposed structure.
That is much safer than incorporating first and trying to make the business fit the corporation afterward.
How Falcon Law PC Can Help
Falcon Law PC assists regulated professionals, clinic owners and other business owners with Ontario corporate structuring.
Our work can include advising on whether an ordinary corporation or professional corporation is appropriate, preparing the Ontario corporation and minute book, assisting with Certificates of Authorization, structuring ownership between professionals, preparing shareholder agreements and coordinating the corporation with the contracts used to operate the practice.
We also advise on business purchases, sales and restructurings involving professional practices.
For broader assistance, see our Corporate & Business legal services. Physicians can also review our guide to corporate legal issues for medical doctors in Ontario.
Get the Structure Right Before Incorporating
A professional corporation can be an effective structure, but it is not simply a regular corporation with the words “Professional Corporation” added to its name.
It has different ownership restrictions, different business-purpose restrictions and an additional regulatory layer.
For professionals building a clinic or business with other people, the most important question may actually be whether the professional corporation should own the entire business at all.
Working that out before incorporation usually produces a much cleaner structure than trying to repair the corporation after the business has already launched.
This article is intended for general informational purposes only and does not constitute legal, regulatory, tax or accounting advice. Professional-corporation requirements vary by profession, and the appropriate structure depends on the ownership, services and business model involved.