The Canada Small Business Deduction lowers the federal corporate tax rate to 9% on the first $500,000 of active business income earned by a Canadian-Controlled Private Corporation (CCPC). That is roughly six percentage points below the 15% general federal rate after the general rate reduction, worth about $30,000 in annual federal tax savings when a CCPC fully uses its business limit.1Canada Revenue Agency. Corporation Tax Rates Whether you actually keep those savings depends on three things: your corporation’s CCPC status, the kind of income it earns, and two separate clawbacks tied to size and passive holdings.
Who Qualifies: CCPC Status
The definition sits in subsection 125(7) of the Income Tax Act. A CCPC must be a private corporation and a Canadian corporation, and it cannot be controlled — directly or indirectly, in any manner whatever — by non-resident persons, public corporations, or any combination of the two.2Department of Justice. Income Tax Act – Section 125 Corporations with shares listed on a designated stock exchange are also excluded.
The test goes beyond a simple majority count. Your corporation fails even if no single non-resident or public corporation has control, so long as a hypothetical person owning all shares held by non-residents and public corporations combined would have control. This look-through catches ownership that is spread thin but collectively dominant.2Department of Justice. Income Tax Act – Section 125 Changes to your share register during the year — a new investor, an issuance to a public entity, a transfer to a non-resident — can cost you CCPC status for the whole tax year.
How the 9% Rate Is Built
Start with the base federal corporate rate of 38%. A 10% federal abatement drops it to 28% on income earned in a province or territory. Two mutually exclusive reductions then apply. Income taxed at the general rate gets a 13% general rate reduction, landing at 15%. Active business income within a CCPC’s business limit instead gets the 19% small business deduction, landing at 9%.1Canada Revenue Agency. Corporation Tax Rates The two reductions do not stack.3Canada Revenue Agency. T2 Corporation Income Tax Guide – Chapter 5 Page 5 of the T2 Return
So the real federal gap between SBD-eligible income and general-rate income is 6 points, not 19. On the full $500,000 limit, that is $30,000 per year federally.
Provincial Rates on Top
Every province and territory adds its own small business rate. Provincial small business rates run from 0% in Manitoba and Yukon up to 3.2% in Ontario, giving combined federal-provincial rates on SBD-eligible income roughly between 9% and 12.2%.1Canada Revenue Agency. Corporation Tax Rates Most provinces match the $500,000 federal business limit, though a few set their own.
The combined numbers matter more than the federal alone. In Ontario, the combined general corporate rate sits near 26.5% against a combined small business rate of about 12.2%. On $500,000 of active business income, that 14.3-point spread is over $70,000 in yearly tax kept inside the business.
The $500,000 Business Limit
The SBD applies only to the first $500,000 of active business income in a tax year. Anything above the limit is taxed at the general corporate rate. The limit is prorated for short tax years — a six-month period yields a $250,000 limit rather than the full amount.2Department of Justice. Income Tax Act – Section 125
Two separate mechanisms can shrink the $500,000 before your income ever reaches it. One is driven by taxable capital, the other by passive investment income. When both apply, you use whichever produces the larger reduction; they are not added together.4Canada Revenue Agency. T2 Corporation Income Tax Guide – Chapter 4 Page 4 of the T2 Return
Taxable Capital Grind
The limit starts eroding once the combined taxable capital employed in Canada of your corporation and its associated group exceeds $10 million in the preceding tax year. The reduction is linear across the $10 million to $50 million band, and at $50 million the SBD is gone entirely.2Department of Justice. Income Tax Act – Section 125
Taxable capital includes equity, retained earnings, surpluses, and certain shareholder loans and advances. The formula reduces the business limit by $500,000 multiplied by the excess capital over $10 million, divided by $40 million. A group with $30 million in taxable capital loses half its limit, leaving $250,000 eligible for the 9% rate. Because the calculation uses the prior year’s figures, a sudden increase in borrowing or retained profit does not hit until the following tax year.
Passive Investment Income Grind
The second clawback targets adjusted aggregate investment income (AAII): interest, rents, royalties, and the taxable portion of capital gains. Once AAII for the previous tax year exceeds $50,000 across the associated group, the business limit falls by $5 for every $1 of excess. At $150,000 in AAII, the entire $500,000 limit is wiped out.5Canadian Tax Foundation. Canadian Small Business Deduction CCPC Eligibility and Reduced Tax Rate
This grind bites faster than the capital version. A corporation with $100,000 in investment income — not unusual for a business sitting on a few years of retained earnings in a portfolio — loses $250,000 of its business limit. Because it uses prior-year AAII, a one-time capital gain from selling an asset can shrink the following year’s SBD even if no passive income follows.
Associated Corporations Share One Limit
If your corporation is associated with others, the whole group shares a single $500,000 business limit. Section 256 sets the rules. The common triggers are one corporation controlling another, or the same person or group controlling both, with additional catches for related persons who each hold 25% or more of the shares.6Department of Justice. Income Tax Act – Section 256
The point is to stop owners from multiplying the limit by spreading operations across corporations. Associated corporations file Form T2 Schedule 23 with their returns to allocate the shared limit.7Canada Revenue Agency. T2SCH23 Agreement Among Associated Canadian-Controlled Private Corporations to Allocate the Business Limit If the group cannot agree, the CRA can assign a zero allocation to every member. That result is avoidable, but it does trip up owners when a new corporation joins the group mid-year.
Income the SBD Does Not Cover
Not every dollar earned by a CCPC is “active business income.” Two categories are pushed outside the SBD and often taxed harder than general-rate income.
Specified Investment Businesses
A specified investment business is one whose principal purpose is earning income from property — rent, interest, dividends, royalties. That income does not qualify for the SBD and is taxed as investment income at higher rates.2Department of Justice. Income Tax Act – Section 125 The main escape is scale: a corporation that employs more than five full-time employees throughout the year in the business falls outside the definition. An associated corporation supplying management or administrative services can also count, if your corporation would have needed more than five full-time employees without that help.
The rule matters most for real estate holdcos. A corporation owning a handful of rental units managed by one or two people is almost certainly a specified investment business, and the CRA looks closely at borderline arrangements.
Personal Services Businesses
A personal services business (PSB) is a corporation whose worker would reasonably be considered an employee of the client if the corporation were not in the picture. The CRA applies five conditions: the worker provided services through a corporation; the worker was a specified shareholder (generally 10% or more of the shares); the corporation employed five or fewer full-time employees; the payments came from an unassociated corporation; and the worker would otherwise be viewed as an employee of the client.8Canada Revenue Agency. Determine if the Workers Corporation Is Carrying on a PSB
The consequences are severe. A PSB pays the 28% federal rate after abatement plus a 5% surtax, with no access to either the SBD or the general rate reduction.9Canada Revenue Agency. Personal Services Business Deductible expenses are limited to salary and benefits paid to the incorporated worker, costs of selling property or negotiating contracts, and legal fees for collecting amounts owed.10Canada Revenue Agency. Worker Who Performs Services on Behalf of Their Own Corporation Personal Services Business Ordinary items like office rent, travel, and supplies are not deductible. Combined federal-provincial rates often exceed 44%. If you are an incorporated consultant working mainly for one client, this classification is the risk to weigh before assuming your income enjoys the SBD.
What the SBD Means for Dividends
The lower corporate rate has a knock-on effect at the shareholder level. Income taxed at 9% does not add to the corporation’s General Rate Income Pool (GRIP), the account that tracks income eligible to be paid as enhanced “eligible” dividends.11Canada Revenue Agency. General Rate Income Pool GRIP Dividends paid out of SBD-taxed earnings are non-eligible (sometimes called “ordinary”) dividends by default.
Personal tax rates on non-eligible dividends are higher than on eligible dividends, which partly offsets the lower corporate rate. That is integration doing its work: whether income flows through a corporation or straight to an individual, the total tax is designed to land in roughly the same place. A CCPC earning everything within the $500,000 limit will typically pay only non-eligible dividends unless it has received eligible dividends from public corporations or has income taxed at the general rate that builds GRIP. Paying an eligible dividend that exceeds your GRIP balance triggers a 20% Part III.1 penalty tax on the excess, so tracking GRIP on Schedule 53 matters when the two pools mix.
Filing and Payment Deadlines
Every corporation files its T2 return within six months of the end of its tax year.12Canada Revenue Agency. When to File Your Corporation Income Tax Return Missing that deadline brings a penalty of 5% of unpaid tax plus 1% per complete month outstanding, up to 12 months. Repeat offenders face doubled amounts: 10% plus 2% per month, up to 20 months.13Canada Revenue Agency. Avoiding Penalties
Payment is a separate, shorter deadline. Most corporations owe the balance two months after year-end. CCPCs that claimed the SBD in the current or prior year get an extra month, making the balance due three months after year-end, but only if the associated group’s total taxable income for the previous year did not exceed its total business limit.14Canada Revenue Agency. Balance-Due Day Once your income grows past the limit, that extra month disappears. Monthly or quarterly instalments are also generally required, with the first instalment due about one month or one quarter after the tax year starts.15Canada Revenue Agency. Corporation Payments – Paying Instalments – Instalment Dates