Business tax rates in Ontario depend primarily on whether a corporation is a Canadian-Controlled Private Corporation (CCPC) and the amount of its active business income. For eligible CCPCs, the combined federal and Ontario corporate tax rate on the first $500,000 of active business income is 12.2%, comprising a 9% federal rate and a 3.2% provincial rate. Effective July 1, 2026, Ontario is permanently reducing its small business corporate income tax rate from 3.2% to 2.2%, lowering the combined rate to 11.2%. Understanding these rates is crucial for Ontario business owners to calculate tax liability, plan for reinvestment, and manage cash flow effectively.
Understanding Ontario's Corporate Tax Structure
The corporate tax system in Ontario is a two-tier structure that combines federal and provincial rates. The rate a business pays is not uniform but is determined by the type of corporation, the nature of its income, and the amount of that income. The primary distinction is between the small business rate, designed to support smaller enterprises, and the general corporate rate. For a Canadian-Controlled Private Corporation (CCPC), which describes most incorporated small businesses in Ontario, active business income up to a specific limit is taxed at a significantly lower rate. This limit, known as the business limit, is set at $500,000 for the 2026 tax year. Income earned by the corporation above this $500,000 threshold is subject to the general combined corporate income tax rate of 26.5%. This structure means that a consulting firm with $400,000 in active business income would pay about $48,800 in combined tax at the 12.2% rate, whereas the same income taxed at 26.5% would result in a liability of $106,000.
The small business rate is achieved through the federal Small Business Deduction (SBD) under Section 125 of the Income Tax Act, which reduces the federal corporate tax rate from 15% to 9% on eligible income. Ontario then applies its own provincial rate on top of this reduced federal base. It is critical to note that these rates are nominal tax rates for a 12-month taxation year ending on December 31, 2026. Corporations must add the applicable federal and provincial rates together to calculate their total combined tax rate. For taxation years that do not align with the calendar year or that straddle the July 1, 2026 effective date for the provincial rate change, the rates must be prorated accordingly. This proration is a necessary step for accurate tax calculation and compliance.
Eligibility for the Small Business Deduction in Ontario
Not every incorporated business automatically qualifies for the reduced small business tax rate. To be eligible for the Small Business Deduction and pay the combined 12.2% rate on active business income, a corporation must meet specific conditions defined under the Income Tax Act. The corporation must be a Canadian-Controlled Private Corporation, meaning it is a private corporation incorporated in Canada that is controlled by Canadian residents. The income must be from an active business carried on in Canada, as opposed to passive investment income or personal services business income. The corporation's taxable capital employed in Canada must be less than $50 million, as the federal business limit of $500,000 begins to be reduced when taxable capital reaches $10 million and is eliminated entirely at the $50 million threshold.
Furthermore, the corporation's active business income must not exceed the annual business limit of $500,000. If any one of these conditions is not met for a portion of the corporation's income, that portion will be taxed at the general combined corporate rate of 26.5%. A key Ontario advantage is that the provincial small business limit is not reduced based on passive investment income. While the federal government reduces the Small Business Deduction when a CCPC's passive investment income exceeds $50,000 in a year, Ontario does not apply this same restriction. This means a corporation's Ontario provincial small business tax rate can remain at 3.2% (and 2.2% after July 2026) even if its federal SBD is reduced or eliminated due to high passive income.
The 2026 Ontario Small Business Tax Rate Cut
On March 26, 2026, the Ontario government announced a permanent reduction to the provincial small business corporate income tax rate as part of its annual budget. The rate is being cut from 3.2% to 2.2%, effective July 1, 2026. This change will lower the total combined federal and provincial tax rate for eligible CCPCs from 12.2% to 11.2% on the first $500,000 of active business income. The government estimates this tax cut will benefit more than 375,000 small businesses across the province, providing annual savings of up to $5,000 for a business earning at the full $500,000 limit. The policy is intended to help entrepreneurs manage rising costs and reinvest in their operations.
Because the rate change takes effect mid-year on July 1, 2026, corporations with fiscal years that straddle this date will pay a blended or prorated provincial rate for the 2026 tax year. For a corporation with a December 31 fiscal year end, the first half of the year would be taxed at the old 3.2% rate, and the second half at the new 2.2% rate. This results in an effective provincial rate of approximately 2.7% for the full 2026 calendar year. Business owners and their accountants must apply this proration correctly when filing the corporate T2 return for any year that includes July 1, 2026. The change is a permanent adjustment to the provincial rate and does not affect the federal small business rate of 9% or the $500,000 business limit.
Taxation of Different Types of Corporate Income
Corporations in Ontario earn different types of income, each taxed under distinct rules. Active business income, derived from the core commercial activities of the business, is eligible for the small business or general rates as previously described. Passive investment income, which includes interest, dividends from portfolio investments, and certain rental income, is taxed at a much higher rate to discourage using a corporation as a personal investment shelter. For a CCPC in Ontario, passive investment income is subject to a combined federal and provincial tax rate of approximately 50.17%. This high rate includes a refundable portion held in a notional account called Refundable Dividend Tax On Hand (RDTOH).
The RDTOH mechanism allows a corporation to recover a portion of the tax paid on passive income when it later pays out taxable dividends to its shareholders. This system aims for integration, where the total tax paid by the corporation and shareholder together is roughly equivalent to what the individual would have paid had they earned the income directly. Another category is income from a Personal Services Business (PSB), which applies to incorporated individuals who provide services but are effectively employees. Since January 1, 2016, the federal corporate tax rate for a PSB has been 33%, and such businesses face limited expense deductions. In Ontario, this rate would be combined with the provincial rate for a total liability significantly higher than standard corporate rates.
How Ontario Compares to Other Provinces in 2026
Corporate tax rates vary across Canada, influencing decisions on where to incorporate or expand operations. Following the 2026 budget announcements, Ontario's combined small business rate of 11.2% will match the rates in Quebec and British Columbia. Prince Edward Island has a small business rate of 15% combined with a higher business limit of $600,000. Saskatchewan has maintained a very low provincial small business rate of 1% for 2024 and later years. Newfoundland and Labrador is implementing a multi-year reduction, lowering its rate to 2% in 2026, 1.5% in 2027, and 1% in 2028, using the federal $500,000 business limit.
For income above the small business limit, the general corporate tax rate becomes a more significant point of comparison. Alberta offers the most competitive general rate in Canada at 11%. Ontario's general provincial rate is 11.5%, which combines with the 15% federal rate for a total of 26.5%. It is important for businesses projecting growth beyond the $500,000 threshold to consider these general rates. The following table shows the small business and general corporate income tax rates for select provinces and the federal government for the 2026 tax year.
| Jurisdiction | Small Business Rate | General Corporate Rate |
|---|---|---|
| Federal | 9% | 15% |
| Ontario | 3.2% (2.2% from July 1) | 11.5% |
| Quebec | 2.2% (from April 29, 2026) | 11.5% |
| Alberta | 2% | 8% |
| British Columbia | 2% | 12% |
When comparing provinces, business owners must also consider eligibility rules beyond the rate. Quebec, for example, has more stringent eligibility requirements for its Small Business Deduction than other provinces. Nova Scotia provides a corporate tax holiday for the first three taxation years of a new small business. The federal business limit of $500,000 is used by several provinces including Ontario, Newfoundland and Labrador, the Northwest Territories, Nunavut, and Prince Edward Island, though PEI's limit is higher at $600,000.
Common Mistakes and Important Considerations
One of the most frequent errors business owners make is misunderstanding the eligibility criteria for the Small Business Deduction, assuming all incorporated businesses automatically qualify for the lower rate. Failing to properly track the type of income, active business versus passive investment, can lead to incorrect tax filings and assessments. Another common mistake is not prorating the provincial tax rate for the 2026 taxation year if the corporation's fiscal year straddles the July 1, 2026 effective date. This requires calculating income and taxes for two separate periods within the same tax return, which many overlook.
Business owners often do not fully account for the impact of passive investment income on their federal SBD. While Ontario does not reduce its provincial small business limit based on passive income, the federal government does. When a CCPC's passive investment income exceeds $50,000 in a year, the federal $500,000 business limit is gradually reduced, which can push a portion of active business income into the higher federal 15% tax bracket even if the Ontario rate remains low. Furthermore, corporations must be aware of the associated change to Ontario's non-eligible dividend tax credit rate, which is being reduced from 2.9863% to 1.9863% effective January 1, 2027. This change affects the personal tax rate shareholders pay on dividends and can influence decisions on whether to retain earnings in the corporation or pay them out.
Key Steps for Ontario Businesses in 2026
To manage the changing tax landscape in 2026, Ontario business owners should take several specific steps. First, confirm your corporation's status as a Canadian-Controlled Private Corporation and review the nature of all income earned to ensure correct classification as active business or passive investment income. Calculate your corporation's taxable capital to verify it remains below the $10 million threshold where the federal business limit begins to phase out. For the 2026 tax year, determine if your fiscal period straddles July 1 and calculate the prorated provincial small business tax rate accordingly, using 3.2% for the period before July 1 and 2.2% for the period after.
Monitor the corporation's passive investment income throughout the year, as surpassing $50,000 will trigger a reduction in the federal business limit, affecting your federal tax calculation. Review the implications of the reduced non-eligible dividend tax credit effective January 1, 2027, on your personal tax planning and consider consulting a tax professional about the timing of dividend payments. Finally, maintain meticulous records of all business income, expenses, and investment income to support accurate filing with the Canada Revenue Agency and the Ontario Ministry of Finance. Proper documentation is essential for claiming the correct deductions and rates.
- Confirm CCPC status and classify all income types correctly.
- Calculate taxable capital to ensure it is below $10 million.
- Prorate the 2026 provincial tax rate if your fiscal year includes July 1, 2026.
- Track passive investment income to watch for the $50,000 federal threshold.
- Review personal tax impact of the new dividend tax credit rate for 2027.
- Maintain detailed financial records for corporate tax filing.
Frequently asked questions
What is the small business tax rate in Ontario for 2026?
For 2026, the Ontario provincial small business corporate income tax rate is 3.2% for the period before July 1. Effective July 1, 2026, this rate is permanently reduced to 2.2%. Combined with the federal small business rate of 9%, the total rate on the first $500,000 of active business income is 12.2% for the early part of the year and 11.2% after the change. Corporations with a fiscal year that includes July 1, 2026, will pay a prorated blended provincial rate for the year.
What income qualifies for the small business tax rate in Ontario?
The reduced small business tax rate applies to active business income earned in Canada by an eligible Canadian-Controlled Private Corporation (CCPC). The income must come from the corporation's core commercial activities, not from passive investments or a personal services business. The rate is available only on the first $500,000 of such income annually. The corporation must also have taxable capital employed in Canada of less than $50 million to fully access the deduction.
How does the July 1, 2026 rate change affect my corporate taxes?
The rate change on July 1, 2026, means your corporation will pay a lower Ontario provincial rate on eligible active business income earned after that date. If your corporation's taxation year includes July 1, you must calculate your taxes using two different provincial rates: 3.2% for income earned before July 1 and 2.2% for income earned on or after July 1. This results in a blended effective provincial rate for your 2026 tax year. The change does not affect the federal small business rate of 9% or the $500,000 business limit.
How is investment income taxed inside an Ontario corporation?
Passive investment income earned by a CCPC in Ontario, such as interest, dividends from portfolio investments, and certain rental income, is taxed at a high combined federal and provincial rate of approximately 50.17%. This rate is designed to discourage sheltering personal investments inside a corporation. A portion of this tax is refundable to the corporation when it pays taxable dividends to shareholders through the Refundable Dividend Tax On Hand (RDTOH) mechanism. Importantly, passive income does not affect your eligibility for Ontario's provincial small business rate, though it can reduce your federal Small Business Deduction.
How does Ontario's corporate tax rate compare to other provinces?
After the July 2026 rate cut, Ontario's combined small business rate of 11.2% will be competitive with Quebec and British Columbia, which also have rates at or near 11.2%. Alberta has a lower general corporate rate of 11%, which benefits businesses with income over $500,000. Saskatchewan maintains a very low 1% provincial small business rate. Prince Edward Island has a higher small business rate of 15% but a higher income limit of $600,000. The choice of province for incorporation involves weighing these rates against other factors like market access and provincial regulations.
What is the general corporate tax rate in Ontario?
The general corporate income tax rate in Ontario applies to active business income that exceeds the $500,000 small business limit or that does not qualify for the Small Business Deduction. The provincial general rate is 11.5%. When combined with the federal general corporate tax rate of 15%, the total combined general rate is 26.5%. This rate applies to all corporations, including non-CCPCs, for income above the business limit. It is the standard rate against which the small business deduction provides significant relief.
Sources and further reading
- 2026 corporate income tax rates bdo.ca
- Canada, Corporate, Taxes on corporate income taxsummaries.pwc.com
- Ontario Corporate Tax Rate for Small Businesses t2inc.ca
- 2026 Corporate Income Tax Rates taxtips.ca
- Ontario's Business Tax-Rate Cut Started July 1 turbotax.intuit.ca
This article explains how things work and is not financial, tax or legal advice. Rules, limits and rates change, so check the current figures with the Canada Revenue Agency, your province or your financial institution before you act.