CPA for Doctors & Physicians — Mississauga & Toronto

By Bader Chowdry, CPA, CA, LPA · Last updated May 3, 2026 · 9 min read

Quick answer: Ontario doctors and medical specialists with $300K+ in gross billings typically save $20K-$60K/year by incorporating as a Medical Professional Corporation (MPC), structuring share classes for TOSI-compliant family income splitting, and pre-positioning for the eventual practice sale via LCGE. Insight CPA has structured 60+ MPCs for family physicians, specialists, dentists, and clinic owners.

Why doctors need a specialized CPA

Medical practices in Ontario operate under the Medicine Act, 1991 and CPSO Professional Corporation Permits. The combination creates tax-planning opportunities most general CPAs miss — most don’t know to check the CPSO permit requirements before structuring share classes, and most don’t pre-position the corporation for the eventual practice sale 10-15 years out.

What is a Medical Professional Corporation (MPC)?

An MPC is a corporation incorporated under the Ontario Business Corporations Act and registered with the College of Physicians and Surgeons of Ontario as authorized to practice medicine. Permitted under the Regulated Health Professions Act. Other regulated health professionals (dentists, optometrists, pharmacists, chiropractors, physiotherapists) have equivalent rules under their respective Colleges.

How much can you save by incorporating?

• $300K-$400K gross billings: $15K-$25K annual tax savings
• $400K-$600K: $25K-$45K annual savings
• $600K-$800K: $40K-$65K annual savings
• $800K+: $60K-$100K+ annual savings

Above figures assume optimal salary/dividend mix, full TOSI-compliant spousal income splitting, RRSP room maximization, and proper Ontario small-business deduction allocation.

Case study: Mississauga specialist saves $42K/year

A Mississauga-based medical specialist with $620K in annual gross billings saved $42,200/year via MPC incorporation, TOSI optimization, and spousal income split. Cumulative 10-year projected savings: $485K. Read the full case study →

“Most CPAs would just incorporate and call it done. The TOSI optimization, the share structure for future estate freezing, and the deferred-dividend timing — those are where the real money is. We engineer for the next 25 years, not the next return.” — Bader Chowdry, CPA, CA, LPA

What we do for doctor clients

• MPC incorporation under CPSO permit (or CDO/CCO/COO equivalents for other professions)
• Three-class share structure for future estate freeze flexibility
• TOSI-excluded family member dividend share structure (documented Excluded Business test)
• Salary-vs-dividend optimization annually based on RRSP room + LCGE pre-positioning
• Year-end tax planning sessions (90-min Q4 reviews — typically save $15K-$30K)
• Practice valuation for sale planning
• QSBC pre-positioning for eventual sale (24-month rolling test)
• Capital Dividend Account (CDA) tracking for tax-free distributions
• Individual Pension Plan (IPP) setup once corp earnings stabilize

Frequently asked questions

1. Can any doctor incorporate as an MPC in Ontario? Any physician licensed by the CPSO can incorporate, subject to the College’s Professional Corporation Permit requirements. Family doctors, specialists, surgeons, locums, and clinic owners all qualify.

2. How much in gross billings makes incorporation worthwhile? For most Ontario specialists, payback begins around $250K-$300K. Below that, additional accounting/CPSO permit costs typically eat the benefit. Above $400K, savings compound rapidly.

3. What is TOSI and why does it matter? Tax on Split Income — CRA rule preventing most family-member income splitting at lower personal tax rates. Dividends to spouse/children from a corporation are taxed at highest marginal rate UNLESS the recipient meets one of the Excluded Amount tests (most commonly Excluded Business = 20+ hours/week active in the practice).

4. What about the LCGE for a future practice sale? 2026 LCGE: $1,016,836 for QSBC shares. To claim it on the sale of MPC shares, the corp must meet the QSBC tests (90% FMV in active business at sale + 50% throughout 24 months prior). We pre-position MPC structures to maintain QSBC eligibility from year one.

5. How long does MPC incorporation take? 6-10 weeks. 3 weeks for incorporation paperwork, 2-4 weeks for CPSO Medical Professional Corporation Permit (separate regulatory step), 1 week for tax-account registration, 1-2 weeks for banking + accounting + payroll setup. Insight CPA handles end-to-end project management.

About the author

Bader Chowdry, CPA, CA, LPA has structured 60+ Medical Professional Corporations for Ontario specialists, family physicians, locums, dental specialists, and clinic owners. He is named as Public Accountant on file for several MPCs.

Schedule a free 30-minute consultation →

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This article is for general informational purposes only and is not tax, legal, or accounting advice. Information current as of May 3, 2026.

Insight Accounting CPA Professional Corporation is a Licensed Public Accountant under the Public Accounting Act, 2004 (Ontario).