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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Business & Commercial Law Ontario » Business Formation & Contracts Ontario » Incorporating a Law Practice: Rules for Professional Corporations in Ontario

Incorporating a Law Practice: Rules for Professional Corporations in Ontario

11 Jun 2026 4 min read No comments Business Formation & Contracts Ontario
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Incorporating a law practice in Ontario allows legal professionals to access lower corporate tax rates, but it absolutely does not shield lawyers from professional negligence claims. You must rigorously follow the Law Society of Ontario (LSO) naming conventions and actively maintain a Certificate of Authorization, which carries an initial LSO application fee of roughly $250 CAD.

Practising law in Ontario comes with immense ethical responsibilities, and intelligently optimizing your firm’s tax structure is a critical step for long-term financial growth. Many successful legal professionals in Toronto, Mississauga, and London choose to operate as a Professional Corporation (PC) to specifically benefit from the provincial small business deduction and efficient income deferral strategies.

However, creating a law corporation is fundamentally different from incorporating a standard commercial retail business. 💼 The Law Society of Ontario (LSO) tightly regulates corporate names, share ownership, and personal liability, ensuring that robust public protection always remains the highest priority for the legal profession.

Step-by-Step Process for Incorporating a Law Practice in Ontario

Transitioning from a sole proprietorship or standard partnership to a Professional Corporation requires meticulous attention to regulatory detail. Most legal applicants in this province follow these exact steps.

Step 1: Incorporate the Business Provincially

First, you must officially incorporate the business under the Ontario Business Corporations Act (OBCA). The Articles of Incorporation must specifically contain mandatory legal clauses explicitly stating that the corporation’s sole business is the strictly regulated practice of law, and it cannot engage in any other unrelated commercial ventures.

Step 2: Structure Lawful Share Ownership

Unlike regular companies where anyone can invest, an Ontario law Professional Corporation has exceptionally strict ownership limits. 👥 All voting shares must be legally and beneficially owned by lawyers currently licensed by the LSO. Non-voting shares can sometimes be held by specific family members (such as a spouse or child) in trust, but this requires specialized tax and legal structuring to avoid severe penalties.

Step 3: Adhere to LSO Naming Conventions

You cannot use flashy, generic marketing names for your legal corporation. The LSO strictly dictates that the corporate name must include the surname of one or more of the lawyer shareholders, followed directly by the words “Professional Corporation” (or the French equivalent, “Société professionnelle”). For example, “Smith Law Professional Corporation” is generally acceptable.

Step 4: Apply for the Certificate of Authorization

Simply incorporating the business at ServiceOntario does not instantly give you the legal right to practice law through that entity. 📋 You must formally submit a detailed application to the Law Society of Ontario to obtain a Certificate of Authorization. You cannot bill clients or operate under the corporate name until this official certificate is fully approved and issued.

Step 5: Maintain Annual Renewals

Once established, the corporation requires continuous maintenance. In addition to filing standard corporate tax returns with the CRA, the lawyer must successfully renew their Certificate of Authorization with the LSO every single year, confirming that the corporate structure remains fully compliant with all current professional conduct rules.

How Much Does it Cost to Incorporate a Law Firm in Ontario?

Setting up a compliant legal corporation involves both government registry fees and professional society fees.

  • Provincial Incorporation Fee: Filing Articles of Incorporation with the Ontario government currently costs around $300 CAD.
  • Corporate Lawyer Fees: Even lawyers frequently hire specialized corporate counsel to set up their PC to ensure pristine tax structuring, generally costing between $1,500 and $3,500 CAD.
  • LSO Application Fee: The Law Society of Ontario charges a mandatory, non-refundable application fee for the Certificate of Authorization, currently set at roughly $250 CAD.
  • Annual LSO Renewal: Maintaining the certificate requires an annual renewal fee payable directly to the LSO, usually around $100 CAD.

How Long Does the Process Take?

Properly timing your incorporation-often aligned with your corporate fiscal year-end-is essential for tax purposes. ⌛

Incorporation PhaseEstimated Timeline in Ontario
Drafting Articles of Incorporation1 to 2 weeks
Provincial Processing1 to 3 business days
LSO Certificate Approval3 to 6 weeks
Setting up Corporate Bank Accounts1 to 2 weeks

Frequently Asked Questions (FAQ)

Does incorporating my law practice protect me from professional negligence lawsuits?

Absolutely not. Under Ontario law and LSO regulations, forming a Professional Corporation does not limit your strict personal liability regarding professional negligence or malpractice. You remain fully liable for the quality of your legal advice, which is why maintaining robust LawPRO insurance is always mandatory.

Can I shield myself from commercial creditors through a PC?

Yes, while a Professional Corporation does not protect against professional malpractice, it generally provides standard corporate limited liability protection against ordinary commercial debts, such as a breached commercial office lease or unpaid corporate vendor invoices.

Can a paralegal and a lawyer co-own the same Professional Corporation?

In Ontario, licensed lawyers and licensed paralegals can legally form a combined professional corporation to provide legal services together, provided they strictly follow specific LSO guidelines regarding mixed ownership structures and clear public naming conventions.

What happens to the corporation if I lose my LSO license?

If the sole shareholder is disbarred or legally suspended from practising law in Ontario, the corporation immediately loses its legal right to practice law. The LSO Certificate of Authorization will be aggressively revoked, and the corporate entity must be swiftly dissolved or heavily restructured.

Do I have to re-register with the CRA after incorporating?

Yes. A newly formed Professional Corporation is a brand-new legal entity. You must obtain a new federal Business Number, set up a new corporate HST account, and open new corporate payroll accounts with the Canada Revenue Agency (CRA).

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