By OptiVal Editorial Desk
Ontario just made incorporated small businesses a little cheaper to run. The Ontario small business tax rate dropped from 3.2% to 2.2% on July 1, 2026, a 31.25% cut to the provincial rate announced in the 2026 Ontario Budget. If your corporation’s year touches that date, and most do, your 2026 tax math is not what it was in January.
Here is what changed, what it is worth in real dollars, and three things to check before December 31.
What changed on July 1, 2026
The Ontario government cut the provincial corporate income tax rate for qualifying small business income from 3.2% to 2.2%, effective July 1, 2026. The official announcement says the cut is worth up to $5,000 a year for more than 375,000 Ontario small businesses, framed as relief from rising costs and U.S. tariff pressure. It builds on the last cut in 2020, when the rate went from 3.5% to 3.2%.
The federal small business rate did not move. It stays at 9%. So the combined federal-Ontario rate on qualifying active business income goes from 12.2% to 11.2% for full years under the new rate. Ontario’s general corporate rate stays at 11.5%.
The Ontario small business tax rate for 2026 is blended, not 11.2%
This is the part most owners will get wrong. The cut took effect mid-year, so 2026 taxation years that straddle July 1 use a blended Ontario rate based on days. For a calendar year-end corporation: 181 days at 3.2% and 184 days at 2.2%, which works out to about 2.70% for the Ontario portion. Combined with the 9% federal rate, that is roughly 11.7% for 2026, not 11.2%. The full 11.2% applies to 2027 and later years.
In dollars: a corporation with $400,000 of qualifying active business income pays about $46,800 for 2026 at the blended rate, versus $48,800 under the old 12.2%. That is $2,000 back. In 2027 the same income costs $44,800, a $4,000 saving. At the full $500,000 small business limit, the annual saving reaches the $5,000 the government advertised.
Who qualifies for the 2.2% rate
The cut applies to the same income that qualifies for the federal small business deduction: active business income of a Canadian-controlled private corporation (CCPC), up to the $500,000 business limit. If your corporation qualifies for the 9% federal rate, it gets the Ontario cut too. Income above $500,000, passive investment income, and non-CCPCs stay at the general rates.
One fine-print item: the $500,000 federal business limit is shared across associated corporations and can shrink if the group earns significant passive investment income. Our guide to the passive income grind walks through that math.
The dividend wrinkle for owner-managers
Here is the part that affects what you actually take home. Ontario is also trimming the non-eligible dividend tax credit from 2.99% to 1.99% effective January 1, 2027, according to an EY tax alert on the budget cited by Investment Executive. That pushes the top personal marginal rate on non-eligible dividends to about 48.89%, up from 47.74%.
In plain terms: the corporation pays less tax, but pulling the money out as dividends gets slightly more expensive at the top end. For most owner-managers this is close to a wash, which is exactly how tax integration is supposed to work. But if you were planning large dividends in early 2027, the timing is worth discussing with your accountant before year-end. Salary-versus-dividend math for 2027 will not match 2026.
Three things to do before December 31
1. Do not estimate 2026 instalments at 12.2%. If you pay corporate tax instalments, base the rest of the year’s payments on the blended 11.7% (calendar year-end), not the old 12.2%. Overpaying just gives the CRA an interest-free loan until your T2 is assessed.
2. Revisit dividend timing. With the dividend credit changing January 1, 2027, any planned shareholder dividends deserve a second look this quarter. This is a conversation for your accountant, not a DIY decision.
3. Fold it into year-end planning. The rate cut interacts with everything else on the year-end list: salary-versus-dividend mix, capital purchases, and bonus accruals. Our 2026 year-end close checklist covers the full sequence.
The bottom line
A full percentage point off your corporate tax rate is real money: up to $5,000 a year at the top of the small business limit. The 2026 blended rate makes the math slightly awkward, but the direction is simple. Incorporated Ontario businesses keep more of what they earn. Make sure your instalments, your dividend plans, and your T2 preparer all know the rate changed.
Our Q4 Year-End Sprint includes a full 2026 tax position review for December 31 year-end businesses, booking now through December 1. Or start with a free consultation: T2 preparation from $449, and we will make sure the new rate shows up correctly on your return.
