This article is for informational purposes only and does not constitute tax or financial advice. Consult a qualified accounting professional before making any tax or financial decisions.
— Quick Answer
Yes, you can still qualify for the small business deduction if your corporation has significant capital, but the $500,000 federal business limit begins to phase out once combined taxable capital employed in Canada (across all associated CCPCs) exceeds $10 million. The reduction is linear between $10 million and $50 million, and the small business deduction is eliminated entirely at $50 million. Ontario applies the same phase-out band for its provincial small business rate. The pre-April 7, 2022 ceiling of $15 million no longer applies. A separate passive-income grind can also reduce the limit, and when both grinds apply the greater reduction wins.
— Why this matters now (and why the $15M number keeps coming up)
If you have searched for the small business deduction recently, you have probably seen two different numbers floating around. Some pages still say the deduction disappears at $15 million in taxable capital. Others say $50 million. Both were correct at some point, which is why owners get confused right before year-end.
For tax years that began on or after April 7, 2022, the federal phase-out range is $10 million to $50 million. The $15 million ceiling only applies to tax years that began before that date. Ontario follows the same federal band.
If your corporation has been quietly growing through retained earnings, a new equity raise, or an acquisition, checking which side of the $10 million line you are on is one of the highest-leverage planning moves available before fiscal year-end.
— Quick start: pick your path
Before working through the rules, find your situation below. The amount of work, and the planning levers available, depend heavily on your structure.
Sole proprietor or unincorporated partnership
The small business deduction does not apply — it is a corporate tax rule. Incorporation versus sole proprietorship is the first decision to walk through.
Single CCPC under $10 million
You generally have the full $500,000 federal business limit. Year-end planning still matters, but the capital grind is not your immediate risk.
Single CCPC between $10M and $50M
You are inside the phase-out band. Your business limit is being reduced, and real planning levers are still available.
Associated group or $50M and over
Combined taxable capital across all associated CCPCs is tested together. At $50 million, the federal small business deduction is fully eliminated.
— What ‘taxable capital employed in Canada’ actually means
Most owners assume taxable capital means something close to retained earnings, or maybe the value of the business. Neither is correct. The definition lives in section 181.2 of the Income Tax Act, and it captures the corporation’s invested capital broadly — equity plus most long-term debt.
In practice, the calculation typically pulls together: paid-up capital on issued shares, retained earnings, contributed surplus and other surpluses, certain reserves shown on the balance sheet, all long-term debt of one year or more, and the deferred-tax balance. Investments in connected corporations and certain other items can be deducted.
The figure that matters for the small business deduction test is the combined taxable capital of the corporation and every associated corporation, measured at the end of the prior tax year. That timing detail trips up a lot of owners. For a broader walkthrough of the rate framework these figures plug into, see our overview of Canadian corporate tax rates explained.
— How the phase-out actually grinds your business limit
Tax practitioners call this the “taxable-capital grind.” It is mechanical and unforgiving. Once your prior-year combined taxable capital crosses $10 million, the reduction kicks in for the current year, and there is no relief just because your operating profit is small.
A worked formula version helps. For every $1,000 of taxable capital above the $10 million threshold, the business limit drops by $12.50. A CCPC with $20 million in taxable capital keeps $375,000. A CCPC with $40 million keeps just $125,000. At $50 million, nothing remains.
This is also the rule that the older $10 million to $15 million web pages get wrong. Under the pre-April 7, 2022 version, the grind was steeper and ended at $15 million. The 2022 federal budget widened the band to $50 million, slowing the reduction and giving mid-sized CCPCs more room. Ontario adopted the same band for its provincial small business rate.
If your group has more than one CCPC, the small business deduction must be allocated across associated corporations, and the same combined-capital test applies.
— Federal vs Ontario: do the rules differ?
The federal small business deduction reduces the federal corporate tax rate from 15% down to 9% on the first $500,000 of active business income. Ontario adds its own parallel deduction, taxing the same first $500,000 at 3.2% — a rate that drops to 2.2% effective July 1, 2026, with prorating for taxation years that straddle that date.
Two practical differences are worth flagging. First, Ontario applies the same $10 million to $50 million taxable-capital phase-out as the federal rule. The Ontario rate change does not affect when you lose access to the deduction. It only affects how much that access is worth.
Second, Ontario does not apply the federal passive-income grind. A CCPC that holds a sizable investment portfolio may lose part of its federal small business deduction while still keeping the full Ontario small business deduction. This carve-out is often overlooked.
Combined, the full small business deduction can save approximately $61,000 per year on $500,000 of active business income in Ontario at 2025 rates, falling slightly after the July 1, 2026 rate reduction. For the Ontario-specific change in detail, see how the Ontario small business rate is changing in 2026.
| Rule | Federal | Ontario |
|---|---|---|
| Reduced tax rate | 9% on first $500,000 of active business income | 3.2% → 2.2% effective Jul 1, 2026 |
| Business limit | $500,000 | $500,000 |
| Phase-out trigger | $10M combined taxable capital | $10M combined taxable capital |
| Phase-out complete | $50M combined taxable capital | $50M combined taxable capital |
| Passive-income grind | Yes — $5 reduction per $1 of AAII above $50,000 | No — Ontario SBD not reduced by passive income |
| Reporting form | Schedule 33 with T2 corporate return | Same Schedule 33 figure flows through |
— A worked example: a CCPC with $25M in taxable capital
Consider a Toronto-based CCPC with $25 million in combined taxable capital employed in Canada at the end of the prior tax year. It earns $500,000 of active business income in the current year and is not part of a group of associated corporations.
The phase-out reduces the federal business limit as follows. Taxable capital above $10 million is $15 million. The reduction is $12,500 per $1 million above the threshold, so the business limit is reduced by $187,500. The remaining federal business limit is $312,500.
That means $312,500 of the corporation’s active business income qualifies for the small business deduction. The other $187,500 is taxed at the general corporate rate. The Ontario calculation mirrors the federal mechanics because Ontario uses the same phase-out band.
In dollar terms, the federal tax cost shifts meaningfully. The eligible $312,500 is taxed at 9% (about $28,125) and the remaining $187,500 is taxed at the federal general rate of 15% (about $28,125), bringing the federal tax to roughly $56,250 instead of $45,000 at the small business rate — an additional $11,250 federally, plus a similar provincial impact in Ontario.
At $25 million in taxable capital, the small business deduction is not gone, but it is materially smaller, and it shrinks further with every extra dollar of taxable capital.
— The five-step roadmap to protect your small business deduction
Owners who do not want to lose access by surprise typically run a structured year-end review. Each step depends on the one before it.
- 1Pull combined taxable capitalGather the prior-year balance sheet for your corporation and every associated corporation, then add equity, surpluses, reserves, and long-term debt. This is the figure that feeds Schedule 33 on the T2.
- 2Test the associated-corporation rulesCommon ownership, controlled groups, family relationships, and certain trust structures can pull other corporations into your group under section 256 of the Income Tax Act. If anyone is associated, their taxable capital counts toward your $10 million threshold.
- 3Check the passive-income grindIf adjusted aggregate investment income from the prior year exceeded $50,000, the federal business limit is reduced separately. At $150,000 of passive income, the federal small business deduction is gone.
- 4Compare the two grindsWhen both apply, the federal business limit is reduced by the greater of the two reductions, not the sum. This is a common reader trap.
- 5Execute planning leversDistributions, intercompany loans, partial wind-ups, holdco restructuring, and timing of debt repayments can each shift taxable capital before year-end. Outcomes depend on facts, so qualified advice matters. Our accounting and tax advisory services page outlines how this review is run in practice.
— Common mistakes owners make near the $10M line
A few patterns come up consistently when owners review their position late in the year.
- →Assuming the phase-out still ends at $15 million. That was the rule for tax years that began before April 7, 2022. The current range is $10 million to $50 million.
- →Forgetting associated-corporation grouping. Family-owned operating and holding companies are routinely associated, and their taxable capital combines for the $10 million test.
- →Adding the two grinds together. The federal rule applies the greater of the taxable-capital grind and the passive-income grind, not the sum.
- →Measuring taxable capital in the wrong year. The figure used is the prior tax year’s combined taxable capital, not the current year.
- →Missing Schedule 33 entirely. CCPCs with taxable capital above $10 million must file Schedule 33 with the T2, and skipping it can trigger CRA reassessment.
- →Treating Ontario like the federal rules across the board. Ontario does not reduce its provincial small business deduction for passive income, which can change the planning math.
- →Confusing taxable capital with retained earnings. Long-term debt and contributed surplus also count, so a modest profit history with significant borrowing can push you closer to the threshold than expected.
For the parallel issue of Ontario’s growing $500,000 limit, see Ontario’s $600K small business limit under Bill 12.
— Frequently asked questions
If my corporation has $12 million in taxable capital, can I still claim any of the small business deduction?
Is the small business deduction phase-out still $10 million to $15 million, or did it change?
What counts as ‘taxable capital employed in Canada’ on my balance sheet?
Do associated corporations have to combine their taxable capital for the $10 million test?
Does Ontario have its own small business deduction phase-out, or does it just follow the federal rules?
Can I split my company into two corporations to keep my taxable capital under $10 million?
How is taxable capital calculated — is it just my retained earnings?
If both the taxable-capital grind and the passive-income grind apply to my corporation, do I add them together?
Need a second set of eyes on your corporate file?
ClearWealth’s corporate tax team runs the Schedule 33 calculation, associated-corporation analysis, and grind comparison annually before year-end, and files Schedule 33 alongside your T2. Book a corporate tax consultation if you would like a year-end review.
Book a ConsultationThis article is for informational purposes only and does not constitute tax or financial advice. Tax rules change, and the application of taxable-capital and passive-income grinds depends on the facts of your corporate group. Consult a qualified Canadian accounting professional before making any tax or financial decisions.
Sources & References
- Ontario small business deduction — Canada Revenue Agency: https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/corporations/provincial-territorial-corporation-tax/ontario-provincial-corporation-tax/ontario-small-business-deduction.html
- Corporations Tax: Corporate Income Tax — Ontario.ca: https://www.ontario.ca/document/corporations-tax/corporate-income-tax
- Income Tax Act, section 125 — Justice Laws Canada: https://laws-lois.justice.gc.ca/eng/acts/I-3.3/section-125.html
- Income Tax Act, section 181.2 — Justice Laws Canada: https://laws-lois.justice.gc.ca/eng/acts/I-3.3/section-181.2.html
- T2 Corporation Income Tax Guide — Canada Revenue Agency: https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/t4012.html
- Schedule 33 (Taxable Capital Employed in Canada) — CRA: https://www.canada.ca/en/revenue-agency/services/forms-publications/forms/t2sch33.html
- Budget 2022 — Department of Finance Canada: https://www.budget.canada.ca/2022/home-accueil-en.html
- Corporate income tax facts (May 2026) — BDO Canada: https://www.bdo.ca/insights/corporate-income-tax-facts
