If you run an incorporated business, the Small Business Deduction is probably the single most valuable tax break you get it’s why a corporation can pay barely 11% tax instead of 27%. Here’s exactly how it works in 2026, who qualifies, and what can quietly take it away.
The Small Business Deduction (SBD) lets a Canadian-controlled private corporation (CCPC) pay a much lower tax rate on its first $500,000 of active business income roughly 11% in BC (9% federal + 2% provincial) instead of the general rate of about 27%. To qualify you must be a CCPC earning active business income. The SBD gets ground down if your corporate group earns more than $50,000 of passive investment income (gone at $150,000) or has large taxable capital. Rates vary by province.
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What Is the Small Business Deduction (SBD)?
The SBD is a federal (and matching provincial) tax reduction that applies a lower corporate tax rate to a CCPC’s active business income, up to an annual limit. It exists to help small businesses keep more capital to reinvest and grow. In practical terms, it’s the difference between paying ~11% and ~27% on your first half-million of profit.
Corporate Tax Rates: Small Business vs General
Canada has two main corporate rates, combining federal and provincial portions:
| Federal | + Provincial (BC) | Combined (BC) | |
| Small business rate (with SBD) | 9% | 2% | ~11% |
| General rate (above the limit) | 15% | 12% | ~27% |
The gap about 16 percentage points in BC is why staying within the SBD limit matters so much.
The $500,000 Business Limit Explained
The SBD applies to the first $500,000 of active business income per year (the federal “business limit”). Income above $500,000 is taxed at the higher general rate. The $500,000 limit is shared among associated corporations you can’t multiply it by setting up multiple related companies. If you’re part of a corporate group, the limit is split among the members.
Who Qualifies (CCPC + Active Business Income)
To claim the SBD, you generally need:
- To be a Canadian-Controlled Private Corporation (CCPC) private, resident in Canada, not controlled by non-residents or public companies.
- Active business income income from actually running a business (selling goods/services), not passive investment income like interest, most rents, or portfolio dividends.
Professional corporations, operating companies, and most small incorporated businesses qualify, provided they’re CCPCs earning active income.
What Shrinks Your SBD (Passive Income & Taxable Capital)
Two things can quietly erode your small business deduction:
- Passive investment income grind: if your associated group earns more than $50,000 of adjusted aggregate investment income (interest, dividends, rental, capital gains) in a year, your $500,000 SBD limit is reduced by $5 for every $1 over $50,000 hitting zero at $150,000 of passive income. Park too much investment income in your corporation and you can lose the low rate on your active income.
- Large taxable capital: if your group’s taxable capital employed in Canada exceeds $10 million, the SBD phases out, disappearing by $50 million. (Relevant for larger companies.)
| Passive income in the group | Effect on $500K SBD limit |
| $50,000 or less | Full $500,000 |
| $75,000 | Reduced to ~$375,000 |
| $100,000 | Reduced to ~$250,000 |
| $150,000+ | $0 (SBD eliminated) |
Provincial Rate Differences (BC, AB, ON…)
The federal rates are the same everywhere, but provinces set their own portion, so combined rates differ:
| Province | Small business (combined) | General (combined) |
| British Columbia | ~11% | ~27% |
| Alberta | ~11% | ~23% |
| Ontario | ~12.2% (→11.2% mid-2026) | ~26.5% |
Where you operate affects your total corporate tax, so multi-province businesses should plan accordingly.
FAQ
What is the small business deduction?
A tax break that lets a CCPC pay a low rate (~11% in BC) on its first $500,000 of active business income, instead of the ~27% general rate.
What’s the corporate tax rate in Canada for 2026?
Federally, 9% small business and 15% general. Combined with BC that’s roughly 11% and 27%; other provinces differ slightly.
What is the $500,000 business limit?
The maximum active business income eligible for the low small-business rate each year. It’s shared among associated corporations.
Who qualifies for the small business deduction?
Canadian-Controlled Private Corporations earning active business income. Passive investment income doesn’t qualify.
How does passive income reduce the SBD?
Passive income over $50,000 in your corporate group reduces the $500,000 limit by $5 per $1, eliminating the SBD at $150,000 of passive income.
Can I set up multiple companies to multiply the SBD?
No, associated corporations must share the single $500,000 limit, so splitting into related companies doesn’t multiply it.
Is investment income taxed at the small business rate?
No, passive investment income is taxed at a high corporate rate (with a refundable portion), not the low active-business rate.
Do all provinces have the same rate?
No, the federal portion is uniform, but provincial rates vary, so combined rates differ by province (e.g., BC ~11%, Alberta ~11%, Ontario ~12.2%).