If you run an incorporated business in Ontario, there’s a good chance you’ve seen headlines about a small business tax cut in the 2026 provincial budget and wondered what it actually means for your bottom line. The short version: it’s real, it’s meaningful, and it’s also more nuanced than the headline number suggests — especially if your fiscal year doesn’t run neatly from January to December.
This guide breaks down exactly what changed, who it applies to, and what Brampton business owners should be checking before their next corporate tax filing.
Featured Snippet: What Changed in Ontario Corporate Tax Rates in 2026?
Ontario reduced its small-business corporate income tax rate from 3.2% to 2.2%, effective July 1, 2026. The change applies to qualifying small-business income up to the $500,000 small-business limit, and tax years that cross July 1, 2026 are prorated between the old and new rates. Ontario’s general corporate income tax rate remains unchanged at 11.5%. Businesses should review their eligibility, taxable income, and fiscal year-end when assessing the impact.
What Is the Ontario Corporate Tax Rate Change for 2026?
What Are Financial Statements for a Small Business?
Prior to the change, Ontario’s small-business corporate income tax rate sat at 3.2%, applied to qualifying active business income earned by eligible Canadian-controlled private corporations (CCPCs).
What Is the New Ontario Small Business Tax Rate?
As part of the 2026 Ontario Budget, the province reduced the small-business rate to 2.2% — roughly a 30% cut to the provincial portion. It’s worth being precise here: this is the provincial small-business rate. The CRA’s federal small-business rate remains 9%, so the combined federal-and-Ontario rate on qualifying income moves from 12.2% down to 11.2% once the new rate is fully in effect. Ontario’s general corporate income tax rate, which applies above the small-business threshold, stays at 11.5% and was not changed by this budget.
When Does the New Rate Take Effect?
The reduced rate applies starting July 1, 2026. That effective date matters more than it might seem, because it means the change doesn’t apply cleanly across a full calendar year for most businesses — more on that below.
Which Businesses May Be Affected by the 2026 Ontario Tax Rate Change?
Canadian-Controlled Private Corporations (CCPCs)
The rate reduction is specifically tied to the small-business deduction, which applies to eligible CCPCs earning active business income in Canada.
Businesses Eligible for the Small Business Deduction
To benefit from the lower rate, a corporation needs to qualify for the small-business deduction on its active business income, up to Ontario’s small-business limit — which remains at $500,000 under the 2026 budget.
Businesses That Do Not Qualify for the Reduced Rate
Income earned above the $500,000 small-business limit, along with income that doesn’t qualify as active business income (such as most investment income), continues to be taxed at the general corporate rate rather than the reduced small-business rate.
Get Expert Help Navigating the 2026 Ontario Corporate Tax Changes
A one-percentage-point cut might sound small on paper, but between proration rules, eligibility thresholds, and the interaction with dividend tax credits, the 2026 Ontario corporate tax changes are easy to get wrong without a proper review. For Brampton business owners, the smartest move is confirming exactly how the change applies to your specific numbers — not assuming the headline rate is what you’ll actually pay.
Contact ProfitNest Accounting Inc. today to review how the 2026 Ontario corporate tax rate changes affect your business, and get support with your corporate tax planning and filing.