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Ontario's small business corporate tax rate falls to 2.2% effective July 1, 2026. This guide explains who qualifies, how the 2026 transition works, and what the change could mean for incorporated businesses.
Ontario has reduced its small business corporate income tax rate from 3.2% to 2.2%, effective July 1, 2026. This is a significant reduction in the provincial portion of corporate tax for qualifying small businesses.
However, the 2.2% rate is not the total corporate tax rate. Ontario corporations also pay federal corporate income tax. For Canadian-controlled private corporations (CCPCs) that qualify for the small business deduction, the federal small business rate is 9%. Once the new Ontario rate is fully applicable, the combined federal and Ontario small business corporate tax rate is generally 11.2%, compared with 12.2% previously.
For many incorporated business owners, the change will create additional after-tax cash that can remain in the corporation for business expansion, debt repayment, investment, or future distributions to shareholders.
What Exactly Changed?
Ontario previously applied a 3.2% provincial corporate income tax rate to qualifying small business income. Effective July 1, 2026, that rate has been reduced to 2.2%.
| Before July 1, 2026 | After June 30, 2026 | |
|---|---|---|
| Federal small business rate | 9.0% | 9.0% |
| Ontario small business rate | 3.2% | 2.2% |
| Combined rate | 12.2% | 11.2% |
The combined 11.2% rate applies only where the corporation and its income qualify for the applicable small business deductions.
How Much Could an Ontario Business Save?
At the provincial level, the reduction is one percentage point.
For example, if a corporation has $500,000 of qualifying active business income and the full 2.2% Ontario rate applies for its taxation year, the provincial tax reduction compared with the previous 3.2% rate can be as much as:
$500,000 × 1% = $5,000
The actual savings will depend on the corporation's qualifying income, taxation year, and eligibility for the small business deduction.
What Happens for 2026 Year-Ends?
One important point is that businesses should not simply apply 3.2% to income earned before July 1 and 2.2% to income earned afterwards.
For taxation years that include July 1, 2026, Ontario's rate reduction is prorated based on the number of days in the taxation year that fall before and after the effective date.
For example, a corporation with a December 31, 2026 year-end will have a blended Ontario small business tax rate for 2026 because approximately half of the taxation year falls before July 1 and half afterwards.
The full 2.2% provincial rate generally applies to taxation years beginning after June 30, 2026.
Which Corporations Qualify for the Lower Rate?
The Ontario small business deduction is available to qualifying Canadian-controlled private corporations (CCPCs). The lower Ontario rate applies to qualifying small business income, with the Ontario small business limit generally set at $500,000.
However, the $500,000 limit should not automatically be assumed to be available to every corporation. Associated corporations may be required to share the business limit, and the available limit can also be affected by taxable capital and other rules.
Federal and Ontario Rules Are Not Always Identical
Business owners with significant investments inside their corporation should be particularly careful when estimating their small business tax rate.
At the federal level, a CCPC's small business limit may begin to decline where the corporation and its associated corporations have adjusted aggregate investment income above $50,000. The federal business limit can ultimately be eliminated once the relevant passive investment income reaches the applicable upper threshold.
Ontario does not parallel the federal passive-investment-income reduction of the business limit. As a result, a corporation may have circumstances where some active business income does not qualify for the federal 9% small business rate while the Ontario treatment differs.
This is one reason corporate tax calculations should not simply be based on multiplying income by 11.2%.
Does This Mean Business Owners Should Leave More Money in Their Corporation?
The lower corporate tax rate increases the amount of after-tax income that can initially remain inside a qualifying corporation. For example, on $500,000 of qualifying income, a one percentage-point provincial tax reduction can leave up to an additional $5,000 in the corporation.
But that does not necessarily mean every shareholder should automatically retain more money corporately. The appropriate strategy can depend on:
- personal cash-flow requirements
- salary versus dividend planning
- RRSP contribution objectives
- corporate investment income
- whether the business owner invests through an operating or holding company
- future business expansion or acquisitions
- longer-term retirement and succession plans
The corporate tax rate is therefore only one part of the overall tax-planning decision.
What Should Ontario Business Owners Do?
For most businesses, there is no special application required simply because Ontario has changed the rate. The appropriate rate is reflected through the corporation's income tax calculation.
However, 2026 is a good time for incorporated business owners to revisit corporate tax estimates and year-end planning. Businesses may want to review whether their tax instalments remain reasonable, how much income is expected to qualify for the small business deduction, and whether corporate investments or associated-corporation rules could affect the available small business limit.
The Bottom Line
Ontario's reduction of its small business corporate tax rate from 3.2% to 2.2% is welcome news for incorporated businesses.
Once fully applicable, qualifying Ontario CCPCs can generally face a combined federal-Ontario small business tax rate of 11.2%, compared with 12.2% previously. For a corporation earning $500,000 of qualifying income, the provincial reduction alone can represent up to $5,000 of annual tax savings.
However, the actual rate applicable to a corporation can depend on its taxation year, associated corporations, income level, business activities, investment income, taxable capital, and other circumstances.
How Source Accounting Can Help
At Source Accounting Professional Corporation, we support incorporated businesses and professional corporations across Mississauga, Toronto, Brampton, Oakville, Milton, and surrounding GTA cities with corporate tax preparation, bookkeeping, HST/GST, payroll, incorporation, and practical tax planning. We also help owner-managers and professionals understand how salary, dividends, corporate investments, and holding-company structures may affect their overall tax position. If you want to understand how Ontario's 2026 small business tax rate reduction affects your corporation, our team can help you review the impact in the context of your specific circumstances.
This article provides general information only and is not intended to constitute tax, accounting, or legal advice. Tax consequences depend on the specific facts and circumstances of each taxpayer. Professional advice should be obtained before implementing a tax or corporate planning strategy.
