Short answer: Medical practice accounting in Ontario involves the HST exemption on insured medical services (and its ITC restrictions), OHIP billing income reporting, Medical Professional Corporation (MPC) tax planning under CPSO rules, CMPA fee deductions, physician salary/dividend optimization, and the specific TOSI rules that govern family member income splitting. A generalist accountant who does not know healthcare will miss both the compliance requirements and the tax planning opportunities specific to physicians and clinics.Physicians, dentists, and allied health professionals in Toronto face a set of accounting and tax challenges that are genuinely unlike any other profession. The HST exemption on most medical services creates ITC restrictions that require careful expense apportionment. OHIP billing income has its own reporting requirements. The Medical Professional Corporation — the most powerful tax planning tool available to Ontario physicians — has CPSO-specific share ownership rules that must be structured correctly before the first billing flows through the corporation. At Bronte Bay, we provide specialized accounting for Toronto medical clinics, family physicians, specialists, dentists, and allied health professionals — from bookkeeping and payroll to MPC incorporation, salary/dividend optimization, and CMPA fee deductions.
Healthcare Professionals We Serve in Toronto
- Family physicians (GP) — solo and group practices
- Medical specialists (cardiologists, dermatologists, psychiatrists, surgeons)
- Dentists and orthodontists
- Optometrists and ophthalmologists
- Physiotherapists and chiropractors
- Registered nurses and nurse practitioners in private practice
- Psychologists and registered psychotherapists
- Naturopathic doctors and other regulated health professionals
- Multi-physician group practices and clinics
- Walk-in clinics and urgent care centres
HST and Medical Services — Exempt, Zero-Rated, and Taxable Supplies
HST on healthcare services is one of the most nuanced areas of Canadian tax law — and one of the most commonly mishandled by general-practice accountants. The rules differ by practitioner type and service:| Service Type | HST Treatment | ITC on Expenses? | Examples |
|---|---|---|---|
| Insured physician services (OHIP) | Exempt — no HST charged | No ITCs on related expenses | OHIP-covered consultations, procedures, hospital visits |
| Uninsured physician services | Generally exempt if “health care service” supplied by licensed practitioner | No ITCs on related expenses | Non-OHIP specialist consultations, some surgical procedures |
| Cosmetic / aesthetic services | Taxable — 13% HST applies | ITCs claimable on related expenses | Botox, fillers, laser aesthetics, hair restoration |
| Administrative / non-clinical services | Taxable — 13% HST applies | ITCs claimable on related expenses | Sick notes, forms, WSIB reports, insurance letters, legal-medical reports |
| Dental services | Exempt if performed by licensed dentist; taxable if cosmetic only | No ITCs on exempt services; ITCs on taxable cosmetic services | Fillings, extractions, root canals (exempt); teeth whitening (taxable) |
| Physiotherapy, chiropractic, optometry | Exempt if performed by licensed practitioner under provincial health legislation | No ITCs on exempt services | Physiotherapy sessions, chiropractic adjustments, eye exams |
| Naturopathy, massage therapy, acupuncture | Generally taxable — not prescribed health care services under the Excise Tax Act | ITCs claimable on related expenses | Naturopath consultations, RMT sessions, acupuncture |
📋 CPA Note: A physician who provides primarily OHIP-covered services (exempt) plus occasional uninsured services (administrative letters, WSIB forms — taxable) has what the CRA calls a “mixed supply” practice. This means the physician must apportion input tax credits between the exempt and taxable portions of their practice — claiming ITCs only on the taxable portion. Failure to apportion correctly, or claiming full ITCs on all practice expenses, is a common error that attracts CRA review of medical practitioners. Bronte Bay performs an annual ITC apportionment analysis for all physician clients with mixed supplies.
Medical Professional Corporation (MPC) — The Most Powerful Tax Tool for Ontario Physicians
Incorporating a Medical Professional Corporation is the single highest-value tax planning decision most Ontario physicians make. The tax savings are substantial — but the structure must satisfy both the Income Tax Act and the College of Physicians and Surgeons of Ontario (CPSO) requirements simultaneously.Tax Advantages of a Physician MPC
- 12.2% Ontario small business rate on the first $500,000 of active professional income — vs. personal marginal rates up to 53.53%
- Tax deferral: income retained in the MPC at 12.2% is not taxed personally until withdrawn as salary or dividends — allowing significant compounding at the corporate level
- Salary/dividend optimization: pay yourself the mix that minimizes combined personal and corporate tax, while generating RRSP room through salary
- Estate planning: share structure flexibility allows wealth transfer and estate freezes for multi-generational planning
- Investment income: retained earnings in the MPC can be invested in a corporate investment portfolio
CPSO Requirements for an MPC
- All voting shares must be owned by the physician (or other physicians licensed to practise in Ontario)
- Non-voting shares may be held by family members — subject to TOSI analysis
- The MPC must be registered with CPSO before the first billing flows through the corporation
- The MPC name must comply with CPSO naming requirements
- The physician remains personally responsible for their professional conduct even when practising through the MPC
📋 CPA Note: A Toronto family physician earning $350,000 in net OHIP billing who incorporates an MPC and draws $150,000 as salary can save approximately $40,000–$60,000 in combined personal and corporate tax annually compared to operating unincorporated. The exact amount depends on their full income picture — RRSP room, investment income, and family situation. Bronte Bay models both scenarios with your actual OHIP billing history before you incorporate, and coordinates with your corporate lawyer on CPSO registration timing so the structure is compliant before the first T2 is filed.
TOSI Rules — Income Splitting for Physicians in 2026
The Tax on Split Income (TOSI) rules introduced in 2018 significantly restricted the ability of professionals to split income with family members through dividends from a professional corporation. For physicians specifically:| Family Member | TOSI Applies? | Conditions for Exemption |
|---|---|---|
| Spouse / common-law partner | Yes — unless exempt | Spouse actively works in the practice 20+ hours/week on average; or physician is 65+; or shares are excluded shares |
| Adult children (18–24) | Yes — unless exempt | Child actively works in the practice 20+ hours/week on average during the year |
| Adult children (25+) | Generally exempt | No active participation requirement — dividends generally taxed at child’s marginal rate, not top rate |
| Minor children (under 18) | Yes — always subject to TOSI | No exemption available for dividends to minors from a professional corporation |
Tax Deductions for Toronto Physicians and Medical Clinics
| Deductible Expense | Details | Documentation Required |
|---|---|---|
| CPSO registration and licensing fees | Annual College of Physicians and Surgeons of Ontario fees and certificate of registration | CPSO annual invoice |
| CMPA annual fees | Canadian Medical Protective Association membership — one of the largest single deductions for many physicians, ranging from $5,000 to $40,000+ depending on specialty and risk category | CMPA annual assessment invoice |
| OMA dues | Ontario Medical Association membership fees | OMA annual invoice |
| Medical office rent and utilities | Clinic or office rent, heat, hydro, internet | Lease agreement, utility statements |
| Medical equipment (CCA) | Diagnostic equipment, exam tables, monitors — deducted through Capital Cost Allowance at applicable rates; eligible for Accelerated Investment Incentive (AII) | Purchase receipts; CCA class determination |
| EMR / medical software | Electronic Medical Record systems (OSCAR, Accuro, Telus Health CHR), billing software, practice management platforms | Monthly/annual subscription invoices |
| Continuing Medical Education (CME) | Conference registrations, CME courses, required recertification costs, travel and accommodation for CME events | Registration receipts, conference agendas, travel receipts |
| Staff salaries and benefits | Medical office assistants, nurses, administrative staff — salaries, employer CPP, EI, WSIB, group benefits | Payroll records, T4 summaries |
| Medical supplies and consumables | Gloves, syringes, swabs, diagnostic consumables used in the practice | Supplier invoices and receipts |
| Home office (solo practitioners) | Proportional share of home expenses if the home office is used regularly and exclusively for administrative medical work | Utility bills, mortgage/lease statements, floor plan |
| Vehicle expenses | Business-use portion for hospital rounds, home visits, or clinic travel — mileage log required | Mileage log showing date, destination, purpose, and km for each trip |
OHIP Billing Income — Tracking, Reporting, and Cash Flow Planning
OHIP payments typically arrive on a two-to-four-week lag from the date of service. For physicians billing through an MPC, the income is earned personally (the licence is personal) and then transferred to the MPC through a management fee or service arrangement. This creates a specific cash flow and income recognition pattern that must be tracked carefully.- OHIP remittance statements — must be reconciled against each payment received to confirm the correct amount was paid for each service code billed
- Shadow billing — for services not submitted to OHIP (uninsured services billed privately), a separate billing system and income tracking is required
- Service code accuracy — incorrect OHIP service codes result in underpayment by OHIP; review of billing patterns against expected service fees is part of our monthly reconciliation
- Accounts receivable for private billing — private patient invoices must be tracked separately from OHIP receipts; aged receivables reported monthly
- Quarterly tax instalments — physicians earning above the threshold must make quarterly instalment payments (March 15, June 15, September 15, December 15) to avoid CRA interest charges
Our Medical Clinic Accounting Services
| Service | What It Covers |
|---|---|
| Monthly bookkeeping | OHIP remittance reconciliation, private billing receivables, expense categorization, bank reconciliation in Xero |
| HST analysis and compliance | Exempt vs. taxable service classification; ITC apportionment for mixed-supply practices; HST registration for taxable services |
| MPC incorporation analysis | Personal vs. MPC tax modelling with your actual OHIP billing; CPSO registration coordination; salary/dividend optimization |
| Corporate tax (T2) planning and filing | MPC small business deduction, passive income planning, RDTOH, capital dividend account, CCA on medical equipment |
| Personal tax (T1) filing | Unincorporated physicians (T2125), MPC salary and dividends, RRSP optimization, investment income |
| TOSI analysis | Annual review of income splitting arrangements; family member share structure; TOSI exemption eligibility |
| CMPA and professional fee deductions | Correct deduction of CMPA, CPSO, OMA, and specialty association fees; confirmation of full deductibility |
| Payroll for clinic staff | CPP, EI, WSIB for medical office assistants, nurses, and administrative staff via Wagepoint; T4 preparation |
| Quarterly instalment planning | Instalment schedule based on projected OHIP and private billing income; mid-year adjustment if billing pace changes significantly |
| CFO advisory | Practice growth planning, equipment purchase analysis, associate compensation structuring, clinic partnership accounting |
Common Accounting Mistakes Toronto Physicians and Clinics Make
| Mistake | Consequence | How Bronte Bay Fixes It |
|---|---|---|
| Claiming full ITCs on all practice expenses | CRA reassessment; ITCs disallowed on exempt-related expenses; interest and penalties | Annual ITC apportionment analysis based on exempt vs. taxable revenue ratio |
| Not registering for HST on taxable services | HST not collected on cosmetic or administrative services; backdated liability when CRA identifies taxable supplies | Service-by-service HST classification at onboarding; correct HST registration for taxable portions of mixed practices |
| Incorporating an MPC without CPSO registration | CPSO compliance breach; billing through an unregistered MPC may be unauthorized practice | CPSO registration confirmed before first billing flows through the corporation; coordinated with corporate lawyer |
| Not deducting CMPA fees correctly | One of the largest physician deductions missed or understated; excess tax paid | CMPA annual assessment reviewed and correctly deducted in full every year |
| Paying family member dividends without TOSI analysis | TOSI applies; family member’s dividends taxed at top marginal rate; significant unexpected tax bill | Annual TOSI review before any family member dividends are declared |
| Not reconciling OHIP remittances | Underpayments by OHIP go uncorrected; income records inaccurate; cash flow surprises | Monthly OHIP remittance reconciliation against billing statements as part of standard bookkeeping workflow |
| Missing quarterly CRA instalments | CRA instalment interest at prescribed rate + 4%; compounds quarterly throughout the year | Instalment schedule prepared at start of each year; calendar reminders sent before each quarterly deadline |
Why Toronto Physicians and Clinics Choose Bronte Bay
| What Healthcare Professionals Need | How Bronte Bay Delivers |
|---|---|
| A CPA who understands medical practice accounting | We know HST exemption on medical services, ITC apportionment, CPSO MPC requirements, CMPA deductions, TOSI rules, and OHIP remittance reconciliation — not just general small business tax. |
| MPC incorporation with CPSO compliance | We model the personal vs. MPC tax saving with your actual OHIP billing, coordinate with your corporate lawyer on CPSO registration, and ensure the structure is compliant before the first T2 is filed. |
| TOSI analysis every year | We review income splitting arrangements annually as family circumstances change — ensuring dividends are paid to family members only where a TOSI exemption clearly applies. |
| HST compliance for mixed-supply practices | We classify every service correctly, apportion ITCs between exempt and taxable activities, and file HST correctly — eliminating the most common CRA audit trigger for medical professionals. |
| Cloud-based, paperless workflow | All bookkeeping on Xero; receipts and invoices via Hubdoc. No paper records at tax time — everything organized and accessible year-round. |
| Transparent fixed pricing | Know exactly what you pay before we start. See our year-end packages and monthly bookkeeping packages for current rates. |
Frequently Asked Questions
Most physician services covered by OHIP are exempt from HST — exempt health care supplies under the Excise Tax Act. Physicians do not charge HST on insured services and cannot claim input tax credits (ITCs) on expenses related to those exempt services. However, uninsured services — cosmetic procedures, sick notes, WSIB forms, insurance letters, legal-medical reports — may be taxable at 13% HST. Physicians with a mix of exempt and taxable services must apportion their ITCs accordingly. Bronte Bay performs this analysis annually for all physician clients.
Most Ontario physicians with consistent net income above $100,000 benefit from incorporating an MPC. The MPC is taxed at the Ontario small business rate of 12.2% on the first $500,000 of active professional income — compared to personal marginal rates up to 53.53%. Income retained in the MPC defers personal tax. The MPC must be registered with CPSO, which requires all voting shares to be owned by the physician. Bronte Bay models the tax saving with your actual billing history and coordinates with your corporate lawyer on CPSO registration.
OHIP billing income is professional income — reported on Form T2125 of a personal T1 return for unincorporated physicians, or on a T2 corporate return for physicians operating through an MPC. OHIP payments are not subject to HST (exempt medical services). All deductible professional expenses — rent, staff salaries, CMPA fees, CPSO dues, CME costs, equipment CCA, medical software — are deducted from gross billing income to arrive at net professional income for tax purposes.
Physicians and clinics can deduct: CPSO registration and licensing fees; CMPA annual membership fees (ranging from $5,000 to $40,000+ depending on specialty); OMA dues; office rent and utilities; medical equipment through CCA; staff salaries and benefits; continuing medical education costs; professional liability insurance; medical supplies; EMR and medical software subscriptions; and home office expenses if applicable. CMPA fees are among the largest single deductions for many physicians — ensuring these are claimed in full and correctly is critical.
Potentially — but subject to the Tax on Split Income (TOSI) rules. A spouse who actively works in the practice 20+ hours per week on average may receive dividends exempt from TOSI. Adult children aged 25+ are generally exempt from TOSI on dividends. Dividends to family members under 25 or minors are generally subject to TOSI and taxed at the top marginal rate. Bronte Bay reviews TOSI exposure annually for every incorporated physician client before any family member dividends are declared.
The College of Physicians and Surgeons of Ontario requires: all voting shares to be owned by the physician (or other licensed Ontario physicians); non-voting shares may be held by family members subject to TOSI analysis; the MPC must be registered with CPSO before it begins providing medical services; the MPC name must comply with CPSO requirements; and the physician remains personally responsible for their professional conduct through the MPC. Bronte Bay coordinates MPC setup with your corporate lawyer to ensure full CPSO compliance before the first billing flows through the corporation.