The Core Tax Math — Incorporation Threshold
Scenario: Ontario consultant, $150,000 net business income
| Tax Situation | Tax Rate | Tax Paid on $150,000 | After-Tax to Spend |
|---|---|---|---|
| Sole proprietor (personal) | ~43% marginal (ON, $150K) | ~$64,500 | ~$85,500 |
| Incorporated — keep in corp | 12.2% (corp SBD rate, ON) | $18,300 | $131,700 left in corp |
| Incorporated — full salary | ~43% effective (same as sole prop) | ~$64,500 | ~$85,500 |
| Incorporated — blend (salary + deferred) | Lower effective rate | ~$35,000–$50,000 | Depends on timing |
Key insight: The $131,700 left in the corporation (after 12.2% tax) earns investment returns tax-deferred. You only pay personal tax when you eventually extract the money — potentially years later at a lower rate or in retirement.
Small Business Deduction — Combined Rate by Province (2026)
| Province | Federal Rate (SBD) | Provincial SBD Rate | Combined Rate | General Corp Rate |
|---|---|---|---|---|
| British Columbia | 9% | 2% | 11% | 27% |
| Alberta | 9% | 2% | 11% | 23% |
| Saskatchewan | 9% | 1% | 10% | 27% |
| Manitoba | 9% | 0% | 9% | 27% |
| Ontario | 9% | 3.2% | 12.2% | 26.5% |
| Quebec | 9% | 3.2% | 12.2% | 26.5% |
| New Brunswick | 9% | 2.5% | 11.5% | 29% |
| Nova Scotia | 9% | 3.5% | 12.5% (lower tier) | 31% |
| PEI | 9% | 1% | 10% | 31% |
| Newfoundland | 9% | 3% | 12% | 30% |
Pros and Cons Checklist
| Factor | Incorporate | Stay Sole Proprietor |
|---|---|---|
| Net income consistently above $80K | ✅ Strong case | Consider when you get there |
| Want LCGE on eventual business sale | ✅ Only available to corporations | ❌ Not available |
| Family members can be shareholders | ✅ Income splitting potential (TOSI rules apply) | Limited |
| Full health benefit deduction (PHSP) | ✅ No limits on corp plan | Limited ($1,500–$2,500 solo) |
| Simple business, low ongoing income | ❌ Setup + compliance cost > benefit | ✅ Simpler, cheaper |
| Want to collect EI (regular benefits) | ❌ Corp owner-operators excluded | ✅ If you opt into EI |
| Personal asset protection from business | ✅ (with limitations — guarantees) | ❌ Personal liability |
| Administrative capacity | ✅ If prepared for bookkeeping burden | ✅ Simpler administration |
| Want RRSP room from business income | ✅ Pay salary that creates room | ✅ Net self-employed income = earned income |
Remuneration Strategy — Salary vs Dividends
| Consideration | Salary | Eligible Dividend |
|---|---|---|
| RRSP room generated | Yes — 18% of salary | No |
| CPP contributions | Yes — both employee + employer share (~$7,000 total) | No |
| Tax deductible by corporation | Yes — reduces corporate taxable income | No — paid from after-tax profits |
| Dividend Tax Credit | No applicable | Yes — reduces personal tax |
| T4 slip | Yes | T5 slip |
| Payroll source deductions | Required | No source deductions |
| Beneficial for low-income year | Salary at lower rates can be efficient | Dividends can be taken at low/zero rates |
Annual Compliance Costs — What to Budget
| Item | Estimated Annual Cost |
|---|---|
| Corporate tax return (T2) | $1,500–$3,000 |
| Bookkeeping / accounting | $1,500–$4,000 |
| Lawyers (minute book, resolutions) | $500–$1,500 |
| Annual provincial corporate filing | $25–$100 depending on province |
| HST filing (if not Quick Method) | Included in accounting fee or minimal |
| Payroll filing (if paying salary) | ~$300–$500 additional |
| Total annual compliance | $3,500–$9,000 |
This cost must be recovered from tax savings before incorporation provides net benefit.
When the Numbers Work — Break-Even Analysis (Ontario, 2026)
| Net Business Income | Annual Tax Deferral Saving (corp vs personal) | Typical Compliance Cost | Net Benefit |
|---|---|---|---|
| $50,000 | ~$5,000 | $4,000–$6,000 | Breakeven / slight negative |
| $80,000 | ~$12,000 | $4,000–$6,000 | Positive ($6K–$8K/yr) |
| $120,000 | ~$21,000 | $5,000–$7,000 | Strong positive ($14K–$16K/yr) |
| $200,000 | ~$37,000 | $6,000–$9,000 | Very strong ($28K–$31K/yr) |
The Lifetime Capital Gains Exemption — The Long Game
If you plan to sell your business eventually, operating through a corporation is critical. Qualifying small business corporation shares may be eligible for the $1,250,000 LCGE (2026, indexed) — tax-free capital gains on the sale of your shares.
| Structure | Sale of Business for $1,000,000 | Tax on Gain |
|---|---|---|
| Sole proprietor selling assets | $1,000,000 gain (less original investment) taxed as capital gain | 50% inclusion at marginal rate = ~$200K+ |
| Corporation — shares sold via LCGE | First $1,250,000 of gain possibly tax-free | $0 on eligible amount |