If you run a Canadian corporation, federal corporate tax can feel high—especially in your early growth years. The Small Business Deduction (SBD) is designed to lower that burden by cutting the federal tax rate on qualifying income. For eligible small businesses, it reduces the federal rate to 9% on the first $500,000 of active business income, a major savings compared to the general corporate rate.
The Small Business Deduction (SBD) is a federal tax deduction, not a cash grant. It applies to Canadian-controlled private corporations (CCPCs) and reduces the amount of Part I corporate income tax you owe on eligible income.
Here’s how it reduces your federal corporate tax rate:
This means the SBD lowers the federal tax rate by 19 percentage points on qualifying income (from 28% to 9%).
Important: Provinces and territories apply their own small business rates. The SBD only affects the federal portion of your corporate tax.
To benefit from the Small Business Deduction, your corporation must meet all of the following conditions:
Who does not qualify:
The full Small Business Deduction applies to the first $500,000 of active business income. However, this limit can be reduced in two key situations:
If your corporation earns too much passive income (like interest, dividends, or rental income):
For every $1 of passive income over $50,000, your $500,000 business limit is reduced by $5.
If your company is associated with other corporations (for example, shared ownership or control):
This rule prevents business owners from multiplying the deduction by splitting operations into multiple companies.
The SBD is not automatic—you claim it when you file your T2 corporate income tax return.
Key steps include:
Most accounting software handles the calculation, but eligibility decisions still matter. Tools like GrantHub’s eligibility matcher can help you filter programs by province and business structure in seconds, especially since tax rules can affect your eligibility for grants and credits.
Assuming the SBD is a cash grant
The Small Business Deduction only reduces tax payable. There is no refund if you have no taxable income.
Ignoring passive income limits
Even profitable operating companies can lose the deduction if passive income creeps above $50,000.
Forgetting associated corporation rules
CRA often reassesses when corporations fail to properly share the $500,000 limit.
Applying the small business rate to all income
Only active business income qualifies. Investment and specified service income may not.
Q: What is the federal corporate tax rate with the Small Business Deduction?
For eligible CCPCs, the federal rate is 9% on up to $500,000 of active business income.
Q: Is the Small Business Deduction refundable?
No. The SBD is a tax deduction that reduces tax payable. It does not create a refund on its own.
Q: Does every small business qualify for the SBD?
No. Only Canadian-controlled private corporations earning active business income in Canada qualify, and limits apply.
Q: How does passive income affect the Small Business Deduction?
Once passive income exceeds $50,000, the business limit is reduced. At $150,000, the deduction is fully eliminated.
Q: Do I need to apply separately for the SBD?
No separate application is required. It is claimed as part of your annual T2 corporate tax filing.
The Small Business Deduction can significantly reduce your federal corporate tax rate—but only if you stay within the rules. Many tax rules can affect your eligibility for grants and credits, as well as provincial programs. GrantHub tracks hundreds of active grant programs across Canada—check which ones match your business profile and see how tax savings and funding can work together.
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