Quick Answer
As a sole proprietor, all clinic income is taxed at your personal rate — up to 53.53% in Ontario. As a professional corporation, profits retained in the corporation are taxed at the small business rate of 12.2% (Ontario, as of 2026). The gap between those rates — up to 41 percentage points — drives the incorporation decision. The break-even point where incorporation savings exceed its costs is typically around $80,000–$100,000 in net annual profit. Below that, sole proprietorship is simpler and often equally suitable.
The Short Answer
The choice between sole proprietorship and incorporation for a wellness clinic is fundamentally a tax math question. Sole proprietors pay personal tax on every dollar earned. Incorporated clinic owners can retain surplus earnings in the corporation at a much lower rate, and only pay personal tax when they draw money out. The decision comes down to whether you consistently earn more than you need to live on — and by how much.
The Full Explanation
Sole Proprietorship: How It Works
As a sole proprietor, you and your business are the same legal entity for tax purposes. All clinic revenue flows to your T1 personal return on Schedule T2125 (Business or Professional Income). Your net practice income — after deducting legitimate business expenses — is added to any other personal income and taxed at your marginal rate.
Ontario combined marginal tax rates (2025 approximate, including Ontario surtax effects — see TaxTips.ca for exact current-year figures):
- 20.05% on income up to approximately $52,886
- 24.15% from approximately $52,886 to $57,375 (Ontario bracket changes; federal rate still 15%)
- 29.65% from approximately $57,375 to $105,775 (federal rate increases to 20.5%)
- 37.91% from approximately $105,775 to $150,000 (Ontario surtax significantly increases effective rate)
- 43.41% on income from $150,000 to $220,000
- 53.53% on income above $220,000
A chiropractor netting $160,000 from their practice pays personal tax at marginal rates — a large portion at 43–53%.
Advantages of sole proprietorship:
- Simple — one T1 return, no corporate filings
- Lower accounting costs
- Losses can offset other personal income
- No regulatory college approval required for business structure
- RRSP contributions generate earned income
Disadvantages:
- No tax deferral on income above personal needs
- No income splitting opportunities (beyond spousal RRSP)
- All income taxable at personal rates in the year earned
Professional Corporation: How It Works
An incorporated wellness clinic is a separate legal entity. The corporation earns income, pays the corporate small business rate (12.2% in Ontario as of 2026) on the first $500,000 of active business income, and retains the after-tax amount.
The owner-practitioner then draws personal income from the corporation as needed — by salary, dividends, or both — and pays personal tax on those draws.
The tax saving comes from the deferral on retained earnings: if you earn $180,000 but only need $120,000 personally, the $60,000 you leave in the corporation is taxed at 12.2% rather than at your personal marginal rate (which might be 43%).
Advantages of a professional corporation:
- Tax deferral on retained earnings (up to 41 percentage points of savings)
- Income splitting potential (within TOSI rules)
- Lifetime Capital Gains Exemption on eventual sale of shares
- Passive investment inside the corporation using pre-personal-tax dollars
- Creditor protection for business debts (not professional negligence)
Disadvantages:
- Additional accounting fees ($3,000–$7,000+ per year)
- Regulatory college approval required
- More complex bookkeeping (payroll, shareholder loans, dividend declarations)
- Dividends don’t create RRSP contribution room
Side-by-Side Comparison
| Factor | Sole Proprietor | Professional Corporation |
|---|---|---|
| Tax on retained income | Personal rate (up to 53.53%) | Small business rate (12.2%) |
| Annual accounting cost | $1,000–$2,500 | $3,500–$7,500+ |
| RRSP contribution room | Yes (on all net income) | Only on salary portion |
| CPP contributions | Yes (both shares) | Only on salary portion |
| Income splitting | Limited | Possible within TOSI rules |
| Capital gains exemption | No | Potentially yes (QSBC) |
| Regulatory requirement | None | College approval required |
| Liability protection | None | Limited (not professional negligence) |
The Break-Even Analysis
The break-even point where incorporation makes financial sense varies by practice, but a useful rule of thumb:
If net annual profit consistently exceeds $80,000–$100,000, model incorporation seriously.
At $100,000 net profit with $70,000 in personal draws and $30,000 retained:
- Tax on $30,000 retained as sole proprietor (~40% marginal): $12,000
- Tax on $30,000 retained in corporation (12.2%): $3,660
- Annual tax saving: ~$8,340
- Less additional accounting costs: ($3,000–$5,000)
- Net benefit: ~$3,000–$5,000 per year
At higher retained amounts, the benefit scales proportionally. At $100,000 retained annually, the net annual benefit can easily exceed $30,000.
When to Stay a Sole Proprietor
Stick with sole proprietorship if:
- Net practice income is below $70,000–$80,000 consistently
- You have personal losses, debt, or financial instability where simple structure is important
- You are early in practice and income is variable
- The practice is small with no plans to scale
When to Incorporate
Incorporate when:
- Net income is consistently above $80,000–$100,000 and you retain meaningful surplus
- You are planning for long-term wealth accumulation
- An eventual practice sale is a realistic future scenario
- You want to access passive investment opportunities inside the corporation
What This Means for Your Clinic
There is no universal right answer — the decision depends on your specific income level, personal financial obligations, and goals. The incorporation decision should be made based on modeled numbers, not rules of thumb.
Wellspring Accounting models the sole proprietor vs. incorporated comparison as part of discovery calls with clients. See our services for chiropractors in Toronto, physiotherapists in Toronto, or massage therapists in Toronto, or read our complete guide to incorporating your Ontario wellness clinic.
Related Questions
Is it better to pay myself salary or dividends from my corporation?
A mix of both is typically optimal. Salary creates RRSP contribution room and CPP eligibility. Dividends carry lower personal tax rates than salary but don't create RRSP room or CPP contributions. The right mix depends on your personal income needs, retirement planning goals, and family situation.
Can I switch from sole proprietor to incorporated mid-career?
Yes. There is no deadline or age requirement for incorporating. Many practitioners incorporate when their income reaches the threshold that makes it financially worthwhile, often 5–10 years into practice. The transition involves setting up the corporation, transferring assets (if any), and updating all professional and financial relationships.
What happens to my RRSP if I incorporate?
Once incorporated and paying yourself dividends instead of salary, you stop generating RRSP contribution room (dividends don't create earned income for RRSP purposes). Many practitioners first maximize RRSP contributions, then shift to dividend-heavy compensation after RRSP is funded. This requires advance planning.
Are there liability protection benefits to incorporating?
A professional corporation provides limited liability protection for business debts — but regulated health professionals remain personally liable for their own professional negligence, regardless of corporate structure. The professional liability protection is less meaningful for practitioners than for non-professional businesses.
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Last Updated: February 2026