TOSI for Ontario Doctors 2026 — Family Splits That Survive
Quick answer (54 words)
The Tax on Split Income (TOSI) rules introduced in 2018 eliminated most dividend-splitting between incorporated Ontario doctors and family members. Five exceptions survive: excluded business (family member works 20+ hr/wk), excluded shares (rarely applies to MPCs), reasonable return, age 65+ exception, and inherited shares. Get any wrong, the dividend is taxed at top marginal rate.
Author: Bader A. Chowdry, CPA, CA, LPA — Insight Accounting CPA, Mississauga.
Why the old "dividend everything to spouse and kids" strategy died?
Before 2018, incorporated doctors routinely paid dividends to their stay-at-home spouse and university-aged kids — splitting the income across multiple lower marginal-rate filers. The "income sprinkling" structure could save $20,000-$60,000 per year per doctor.
The 2018 TOSI amendments to Section 120.4 of the Income Tax Act killed that structure for nearly all dividends to family members who don't actively work in the business. CRA now applies the top marginal personal tax rate (53.53% in Ontario for 2026 income above $246,752) to any dividend caught by TOSI.
The five exceptions that still work
Exception 1: Excluded Business
The family member must work in the business "on a regular, continuous, and substantial basis" — averaging at least 20 hours per week during the year, OR during any five prior years. This is the cleanest exception. If your spouse runs the front office full-time, dividends to them are TOSI-free.
Exception 2: Excluded Shares
The recipient must be 25+ years old, own 10%+ of the votes AND value of the corporation, and the corporation must NOT be a "service business" providing services to clients of an active business. Most MPCs ARE service businesses (the doctor provides medical services), so this exception usually fails for MPCs.
Exception 3: Reasonable Return
Payments based on labour, capital invested, financial risks taken, or prior contributions. The threshold is high and CRA-tested. Useful in narrow circumstances, e.g., a spouse who provided startup capital can receive a "reasonable" dividend in proportion to that capital.
Exception 4: Age 65+ Exception
If the principal of the corporation is age 65+, the spouse can receive dividends without TOSI. Limited use — typically only kicks in toward the end of an incorporated doctor's career.
Exception 5: Inherited Shares
Narrow exception for dividends received on shares acquired by inheritance.
What still works (the practical playbook)?
Spouse who works 20+ hr/wk in the practice:
- Excluded business exception applies.
- Pay reasonable salary AND dividends.
- Document the work: hours, role, compensation comparable.
Spouse who occasionally helps but doesn't meet 20-hour threshold:
- Pay a fair-market salary for actual work performed (e.g., bookkeeping rate of $25/hr × hours worked).
- Salary is deductible by the corp; spouse pays personal tax at their bracket.
- NO dividends, TOSI applies.
Adult children working in practice (front desk, IT, marketing):
- Excluded business exception applies if 20+ hours/week.
- For most university kids working part-time in the summer, document carefully, TOSI is the default.
Adult children NOT working in practice:
- Dividends are TOSI-caught (top marginal rate).
- Use family trust holding shares for future capital growth (post-estate-freeze), the LCGE on eventual sale of trust-held shares can flow to beneficiaries differently.
At age 65+:
- TOSI age exception kicks in.
- Spouse can receive dividends at their personal rates.
- Plan the post-65 income split as part of retirement strategy.
TOSI risk audit, what we do annually
Every doctor client gets an annual TOSI risk audit:
- Inventory all family members receiving any compensation from the MPC: salary, dividends, fees, loans, benefits.
- Document each person's role: hours/week, responsibilities, compensation history.
- Test against the five exceptions: excluded business, excluded shares, reasonable return, age 65+, inherited.
- Flag anything ambiguous for legal review.
- Restructure the next year's compensation to stay TOSI-clean.
Cost of a TOSI reassessment: top marginal tax (53.53%) on the dividend amount, plus interest, plus penalties (often 10-50% of the tax). Cost of an annual TOSI audit at Insight Accounting CPA: included in the engagement fee.
FAQ, TOSI for Doctors (2026)
Q: Can I dividend-split with my non-working spouse?
A: Generally no. The TOSI rules tax dividends to a non-working spouse at the top marginal rate (53.53% in Ontario for 2026 income above $246,752). The "excluded business" exception requires 20+ hours/week of average work; the "excluded shares" exception rarely applies to MPCs.
Q: Can I pay my spouse a salary instead?
A: Yes, if the salary is for actual work performed at a fair market rate. Document hours, role, and rate. Salaries to family members for genuine work are not caught by TOSI; they're a normal employer-employee deduction.
Q: What happens if CRA reassesses a dividend as TOSI-caught?
A: Tax at the top marginal rate (53.53% in Ontario), plus arrears interest from the original due date, plus potential penalties (10% to 50% gross negligence penalty if CRA argues willful misclassification). A $50,000 dividend wrongly classified can cost $25,000+ in tax and penalties.
Q: Can my adult kids in university receive TOSI-free dividends?
A: Only if they work 20+ hours/week in the practice on average, almost never the case for full-time students. Plan family income via salaries for real work performed, not dividends.
Q: What about dividends to a family trust?
A: Dividends paid to a family trust are then allocated to beneficiaries. TOSI applies at the beneficiary level, if a beneficiary doesn't meet an exception, that beneficiary's share is TOSI-taxed. Family trusts solve some problems (capital gains attribution, estate freeze growth allocation) but don't solve TOSI on annual income distributions.
Q: Will Bill C-208 help my situation?
A: Bill C-208 (2021) applies to genuine intergenerational transfers of corporate shares from parent to adult child, carving out a narrow Section 84.1 exception. It's about avoiding the deemed-dividend treatment on share sales to family corps, not about TOSI on dividends. The intergenerational-transfer rules require the child to take active control.
Q: What documentation do I need to support an excluded-business exception?
A: Time records (logged hours/week), job description, work output evidence (emails, completed tasks, invoices for services), comparable market-rate analysis. CRA can request all of this on review. We help build and maintain this documentation as part of the doctor engagement.
Case study: Mississauga family medical practice incorporation
The challenge. A Mississauga-based family physician with $385K gross billings was paying $108K in personal income tax under sole-proprietorship status, with no income-splitting capability and shrinking RRSP room.
What we did. We incorporated her practice as a Medical Professional Corporation, structured share classes for future estate freeze, and added her physician spouse as a TOSI-excluded discretionary dividend shareholder.
The result. Annual tax savings: $28K. Cumulative 10-year projected savings: $310K. RRSP room maximized.
"Most CPAs incorporate and stop. The TOSI optimization and pre-positioning for the eventual practice sale is where real money compounds.", Bader Chowdry, CPA, CA, LPA
Most CPAs treat tax planning as annual paperwork. We treat it as a 25-year compounding strategy, every decision today affects retirement, succession, and the eventual sale.
, Bader Chowdry, CPA, CA, LPA
Try our free Insight Accounting CPA tools
| Tool | What it does |
|---|---|
| Salary vs Dividend Optimizer 2026 | Calculates tax-optimal salary/dividend mix for incorporated owners |
| LCGE Calculator 2026 | Estimates Lifetime Capital Gains Exemption claim on a future sale |
| Incorporation Savings Calculator | Compares sole-prop vs incorporated tax outcomes |
| CRA Letter Decoder | Translates a CRA letter into plain English + recommended next steps |
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This article is for general informational purposes only and is not tax, legal, or accounting advice. Information current as of 2026-05-01 under Canadian and Ontario tax law. Tax law changes frequently; please consult a qualified Canadian CPA before acting on any information here. Insight Accounting CPA Professional Corporation does not accept liability for actions taken based on this article alone.
Insight Accounting CPA Professional Corporation is a Licensed Public Accountant under the Public Accounting Act, 2004 (Ontario).
