Should I incorporate?
Incorporation is rarely a tax-free win. It is a deferral mechanism that pays off only when business income materially exceeds what you spend, and only after non-tax frictions (annual returns, separate bookkeeping, payroll for owner-managers) are factored in. This guide walks the analytical structure alongside our Should I Incorporate? calculator.
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Guidance, not advice. We explain the rules, we don't assess your situation. Always seek financial or tax advice from your accountant, or contact CRA. Read our editorial scope →
1. The Small Business Deduction (SBD) advantage
A CCPC earning active business income up to the $500,000 federal SBD limit (ITA s. 125)pays a combined federal/provincial small-business rate of roughly 9–12% depending on province. Above the limit, the general corporate rate (~25–27%) applies. The deferral — the gap between the corporate rate and your personal marginal rate — is what funds the strategy.
2. Integration theory
Canadian tax is designed so that income earned through a corporation and distributed as dividends produces roughly the same total tax as if earned personally. Pure integration is approximate, not exact; small tax cost or tax savings arise at each income band. The real win is the tax deferral on retained earnings, not absolute savings.
3. Income threshold by province
Rule of thumb: incorporation begins to pay when active business income persistently exceeds personal consumption needs by roughly $50–80k. Below that, integration leakage plus compliance cost outweigh the benefit. The exact crossover depends on province (BC, AB lower; QC higher on the corporate side).
4. Non-tax advantages
- Limited liability (subject to personal guarantees and director liability for HST, payroll, environmental)
- Continuity (perpetual existence, easier succession)
- Access to LCGE on QSBC share sale
- Income splitting via spousal/family shares (heavily restricted post-TOSI)
5. Non-tax disadvantages
- Annual corporate filings (T2, GIFI, provincial annual return)
- Separate books, separate bank account, separate payroll for owner-manager
- Cost: incorporation $300–$1,500 + annual maintenance $1,500–$4,000
- Loss treatment is more restrictive corporately
6. The passive-income trap
Under ITA s. 125(5.1), the SBD limit is reduced by $5 for every $1 of passive investment income above $50,000 in the prior year, eliminating the SBD entirely at $150,000 of passive income. Holding significant investments inside an operating CCPC erodes the very deferral the structure is designed to create — driving the OpCo/HoldCo separation strategy.
7. TOSI restrictions
Tax on Split Income (s. 120.4) taxes dividends to family members at the top marginal rate unless an exclusion applies. This neutralised most simple income-splitting strategies. See TOSI rules.
8. LCGE access
The $1.25M Lifetime Capital Gains Exemption is only available on disposition of QSBC shares — sole proprietors cannot access it. For a saleable business, incorporation is essentially mandatory.
9. Professional corporations
Doctors, dentists, lawyers, accountants, engineers (varies by province) can incorporate but face provincial restrictions on shareholding and may have limited income-splitting after TOSI.
10. The five-year test
Incorporation makes sense if the business will run another 5+ years at scale; setup and wind-down costs are material relative to a short-lived structure. Below that horizon, sole-proprietor status is usually better.
The real numbers — five income levels
Net annual benefit of incorporating vs. remaining a sole proprietor, after deducting roughly $5,000 of annual compliance cost (T2, bookkeeping, payroll admin). Figures assume full retention of after-tax corporate earnings (pure deferral).
| Active business income | Verdict | Net savings (ON) | Net savings (AB) | Net savings (QC) |
|---|---|---|---|---|
| $50,000 | Almost never | $950 | $1,176 | varies |
| $80,000 | Tipping point | $4,387 | $4,669 | $5,283 |
| $120,000 | Usually yes | $4,727 | $4,992 | varies |
| $200,000 | Almost always | $5,255 | $5,559 | $7,447 |
| $400,000 | Definitely | $6,524 | $6,788 | $10,934 |
What nobody tells you — 5 traps
- TOSI kills family splitting (post-2018). Dividends to a spouse or adult child hit the top marginal rate unless an exclusion (excluded business — 20+ hrs/wk for 5 prior years, excluded shares, reasonable return) applies. ITA s. 120.4.
- CPP is the same either way. Sole props pay both halves on net SE income; a CCPC owner-manager pays both halves through payroll. RRSP room is only generated by salary (18% of earned income) — dividends generate none.
- EI adds ~$2,600/year corporate cost. Sole proprietors do not pay EI; an incorporated owner-manager on T4 payroll triggers employer EI (and usually employee EI unless they own > 40% of voting shares and elect out).
- Passive income > $50k erodes the SBD. $5 of SBD reduction per $1 of AAII over $50,000, eliminating the SBD by $150k of passive income. ITA s. 125(5.1).
- PSB = death penalty. A Personal Services Business gets no SBD, faces the full corporate rate plus a 5% federal surcharge, and is limited to a handful of deductions under s. 18(1)(p). See PSB guide.
Compliance costs — the honest reality
- One-time incorporation: $1,500–$3,000 (legal + filing).
- Annual accounting (T2 + T1 + bookkeeping): $2,500–$5,000.
- Payroll admin (if running owner salary): $500–$1,500/year.
- Total annual cost: roughly $3,500–$7,000/year.
- Add a HoldCo: another $2,000–$3,000/year for the second T2 + bookkeeping.
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