Ontario small business deduction

The deduction reduces the Ontario basic income tax of a corporation that was a Canadian-controlled private corporation (CCPC) throughout the tax year. 

It is calculated by multiplying the corporation's Ontario small business income for the tax year by the small business deduction rate (8.3%) for the year, resulting in a lower tax rate of 3.2%.

The Ontario small business deduction is phased out for CCPCs (including associated corporations) with taxable capital employed in Canada of more than $10 million in the previous tax year. It is completely eliminated when the taxable capital is $50 million or more in the previous tax year. For tax years starting before April 7, 2022, the amount was $15 million. This is referred to as the taxable capital business limit reduction.

The Ontario small business limit is not subject to the federal passive income business limit reduction. (See the details about the reduced business limit.) As such, eligible Ontario small businesses can receive the Ontario small business deduction regardless of the amount of passive income they earned.

When calculating the Ontario small business income, the corporation's Ontario domestic factor is the ratio of the corporation's Ontario taxable income to the corporation's taxable income earned in all provinces and territories.

Claiming the deduction

You can use Part 2 of Schedule 500, Ontario Corporation Tax Calculation, to calculate the deduction. Schedule 500 is a worksheet and you do not have to file it with your return.

On line 402 of Schedule 5, Tax Calculation Supplementary – Corporations, enter the Ontario small business deduction amount.

Forms and publications

• Schedule 500, Ontario Corporation Tax Calculation
• Schedule 5, Tax Calculation Supplementary – Corporations
• T2 Corporation Income Tax Return

Government partners

• Ontario Ministry of Finance