What is the small business deduction in Canada

Short answer

The small business deduction lowers the federal corporate tax rate to 9% on the first $500,000 of active business income for a Canadian-controlled private corporation. Combined with provincial rates, it produces a total rate near 9% to 12.2% instead of the general 23% to 31%.

How much the deduction is worth

The small business deduction reduces the federal rate on active business income from 15% to 9%, on the first $500,000 earned in a year. That six-point federal saving, plus the lower provincial small business rate most provinces offer, is worth tens of thousands of dollars a year to a profitable small corporation.

On the full $500,000, the difference between the small business combined rate and the general rate is commonly around $60,000 to $90,000 in tax. Preserving access to this deduction is therefore one of the highest-value planning objectives a small corporation has.

Who qualifies

The deduction is available to a Canadian-controlled private corporation, a CCPC. Broadly that means a private corporation resident in Canada that is not controlled by non-residents or public companies. The income must be active business income, not passive investment income, which is taxed under a different and higher regime.

Personal services business income does not qualify, and neither does most investment income. The distinction between active and passive income is where many assessments turn.

The $500,000 limit is shared

The $500,000 business limit is not per corporation, it is shared among associated corporations. If you control several companies, they divide one $500,000 limit between them rather than each getting their own. This prevents multiplying the deduction by splitting a business across entities.

Association rules are broad and catch common structures like a holding company and its operating subsidiary, or corporations owned by the same family. Getting the associated-corporation analysis wrong is a frequent and expensive error.

How passive income grinds it down

Since 2019, a CCPC that earns more than $50,000 of passive investment income in a year sees its business limit reduced by $5 for every $1 over that threshold. At $150,000 of passive income, the $500,000 limit is eliminated entirely and all active income is taxed at the general rate.

This grind is why the mix of active and passive income inside a corporation matters, and why owners with significant retained investments need to plan around it rather than let it erode the deduction unnoticed.

The taxable capital limit

A second grind applies based on taxable capital employed in Canada. Historically the deduction phased out between $10 million and $15 million of taxable capital; the upper end was extended to $50 million in recent years. Most small businesses are far below this, but growing companies should watch it as they accumulate assets.

Primary source

Income Tax Act, s. 125 Small business deduction

Reviewed for the 2025 tax year by Udit Gupta, Certified Tax Accountant. General information, not advice for your specific situation — book a free 15-minute call to discuss your circumstances.

Small Business Deduction: Frequently Asked Questions

What is the small business deduction in Canada? Frequently Asked Questions

Common questions regarding our compliance workflows and service guarantees.

It is claimed on the T2 return, and eligibility must be established each year. It is not a permanent status, it depends on the corporation meeting the CCPC and active-income tests annually.

Income from carrying on a business, as opposed to passive investment income like most interest, rent and portfolio dividends. The line can be fine, particularly for rental and investment-heavy operations.

Not if they are associated. Associated corporations share a single $500,000 limit, allocated among them by agreement.

Above $50,000 of passive income in a year, yes, progressively. At $150,000 the deduction is fully eliminated for that year.

Active income above the limit, or when the deduction is ground out, is taxed at the general combined rate of roughly 23% to 31% depending on province.

Yes. Managing passive income, reviewing association, and planning the salary-dividend-retention mix all protect access to the deduction. We build that into year-end planning.

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People Also Ask

The questions Canadians actually search on this topic, answered plainly. Browse every question in the Canadian tax answers directory.

A tax return is the annual filing that reports your income, deductions and credits to the CRA so the final tax for the year can be settled. Payers withhold tax during the year and the return reconciles that against what you actually owe, producing either a refund or a balance to pay. For 2025 returns filed in 2026, refunds usually arrive in about two weeks for an online return, while a paper return runs on a considerably longer standard because it is handled manually.

Paper returns go to the CRA tax centre that serves your province or territory of residence, not to one national address. The correct address is printed in the paper return package and listed on canada.ca under mailing addresses for individual returns, and it differs for non-residents and for business returns. Filing electronically is much faster: for the 2025 tax year the CRA aims to issue a refund on an online return in about two weeks, against a considerably longer standard on paper.

If you owe nothing, no penalty applies, but a refund and benefit payments such as the Canada child benefit and the GST/HST credit are held up until the return is processed. If you owe, a late-filing penalty is charged and interest runs on the balance and compounds daily from the day after the due date. For the 2025 tax year the deadline was 30 April 2026. File even if you cannot pay, because the penalty is driven by filing, not payment.

Not indefinitely. Property tax is collected by your municipality, which charges interest on arrears and can eventually register a tax arrears certificate and sell the property under provincial tax-sale rules. The permitted period of arrears is set by provincial legislation and varies, so ask your municipality for its schedule and payment options. Municipal arrears are separate from anything owing to the CRA, and paying one does not clear the other.

Yes, and it is usually worth doing. With no income you generally owe nothing, but filing is how the CRA works out the GST/HST credit, provincial credits and the Canada child benefit, and how unused tuition amounts carry forward. Report zero income on the T1 and claim what you qualify for. Benefit payments pause when a return is missing, so file even for a year with no earnings at all.

Pension income splitting is the largest lever for most couples: up to 50% of eligible pension income can be reported by a lower-income spouse, and RRIF income qualifies from age 65. Beyond that, sequence withdrawals from registered and non-registered accounts to keep net income under the Old Age Security recovery threshold, use TFSA withdrawals that count as no income at all, claim the pension and age credits, and consider drawing down RRSPs before the plan must be wound up, which is by the end of the calendar year in which you turn 71 and not on your 71st birthday.

The grant portion of OSAP is reported on your return; the loan portion is not, because borrowed money is not income. A slip is issued for the grant, and most full-time students in a qualifying programme can then claim the scholarship exemption, which usually leaves nothing taxable. Interest you pay on the government portion of a student loan can support a separate credit, so keep the annual interest statement with your tax records.

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Reviewed and fact-checked by Udit Gupta

Ex Big 4 — Ernst & Young, Deloitte · International & cross-border tax specialist · CPA Canada (In-Depth Tax Program) · Chartered accountant, ICAI & MIA

Udit Gupta has over 15 years of experience helping corporations and business owners with corporate structuring, corporate tax filing, bookkeeping, payroll, GST/HST, cross-border tax and CRA representation. Big 4 trained at Ernst & Young and Deloitte, and qualified as a chartered accountant in India and again in Malaysia, he founded his accounting practice in 2014 to serve entrepreneurs, startups and non-resident business owners across Canada. View full member bio.

The Institute of Chartered Accountants of India — member 521458 · Malaysian Institute of Accountants — member CA 44667 · Ex Big 4: Ernst & Young, Deloitte · CPA Canada (In-Depth Tax Program), completed 19 Dec 2023 · In-Depth GST/HST Part I, 12 Jul 2022 · Part II, 5 Jul 2023

Editorial policy. Every page is researched against primary sources — the Income Tax Act, CRA publications and CPA Canada guidance — and every rate or threshold is stated with the tax year it applies to.