--- title: "Passive Income and the SBD: The $50,000 Rule Explained" url: https://www.everstonecpa.com/blog/small-business-deduction-passive-income-canada description: "How passive investment income above $50,000 grinds down a corporation’s small business deduction, where it disappears entirely. See what that costs." type: guide updated: 2026-10-12 summary: "The Small Business Deduction (SBD) reduces the federal corporate tax rate from 15% to about 9% on the first $500,000 of active business income earned by a Canadian-controlled private corporation — roughly 11% combined in British Columbia." faq_count: 7 publisher: EverStone CPA Inc., a Chartered Professional Accountant firm registered with CPA British Columbia and CPA Alberta service_area: British Columbia, Alberta, Ontario and Manitoba language: en-CA contact: info@everstonecpa.com · https://www.everstonecpa.com/book-online --- [Home](https://www.everstonecpa.com/) [Blog](https://www.everstonecpa.com/blog) Small Business Deduction & the $50,000 Passive Income Rule Tax # Small business deduction: *the $50,000 passive income rule* By EverStone CPA · Updated August 2026 · 9 min read Quick answer **Quick answer:** The [Small Business Deduction](https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/t4012.html) (SBD) reduces the federal corporate tax rate from 15% to about **9%** on the first **$500,000** of [active business income](https://www.everstonecpa.com/glossary#abi) earned by a [Canadian-controlled private corporation](https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/corporations/type-corporation.html) — roughly **11%** combined in British Columbia. But if your corporation earns more than **$50,000** of passive investment income in a year, that $500,000 business limit starts shrinking by **$5 for every $1** over the threshold, and disappears entirely once passive income reaches **$150,000**. **On this page**[What the Small Business Deduction actually does](#s-what-the-small-business-deduction-actual)[The $500,000 business limit](#s-the-500-000-business-limit)[The $50,000 passive income threshold](#s-the-50-000-passive-income-threshold)[How the grind works](#s-how-the-grind-works)[The real cost of losing the deduction](#s-the-real-cost-of-losing-the-deduction)[Association rules](#s-association-rules)[Practical planning](#s-practical-planning)[Bottom line](#s-bottom-line)[Frequently asked questions](#s-frequently-asked-questions)[Not sure if the passive income rule affects you?](#s-not-sure-if-the-passive-income-rule-affe) $5 of business limit lost for every $1 of passive income over $50,000. **Rather have a CPA handle this?** A CPA at EverStone replies with a straight answer and a fixed fee for your situation. [Get My Fixed Quote →](https://www.everstonecpa.com/book-online?service=planning#enquiry-form) ## What the Small Business Deduction actually does Every Canadian-controlled private corporation ([CCPC](https://www.everstonecpa.com/glossary#ccpc)) pays federal corporate tax at a general rate of 15% on its active business income. The Small Business Deduction is a rate reduction, not a separate write-off — it drops that federal rate to roughly **9%** on qualifying income, up to the corporation’s **business limit** (as of 2026, $500,000). In British Columbia, the provincial small business rate adds another 2%, bringing the combined small business rate to about **11%**, compared with roughly **27%** combined once income exceeds the limit or doesn’t qualify as active business income. For most incorporated contractors and small business owners in the Fraser Valley, this is the single biggest reason to incorporate in the first place: it lets the corporation retain more after-tax cash to reinvest, rather than paying it all out and losing a large chunk to personal tax immediately. The [What your T2 will likely cost](https://www.everstonecpa.com/corporate-tax-estimator) shows the size of that gap for your province and income. Related: [Should you leave money in your corporation, or pay it out?](https://www.everstonecpa.com/blog/leave-money-in-corporation-or-pay-out-canada). ## The $500,000 business limit The business limit is the ceiling on how much active business income per year can be taxed at the reduced small business rate. It applies per corporate group, not per corporation — corporations that are **associated** for tax purposes (generally, corporations under common control) must share a single $500,000 limit and file an allocation agreement with the CRA rather than each claiming their own. Only active business income earned by a CCPC qualifies; passive investment income never qualifies for the SBD rate regardless of how much room is left. **Investments building up inside the company?** We track passive income each year and plan around the small business deduction limit before the year-end, at a fee quoted in writing. [Get a tax planning quote](https://www.everstonecpa.com/book-online?service=planning#enquiry-form). [Get My Fixed Quote](https://www.everstonecpa.com/book-online?service=planning#enquiry-form) ## The $50,000 passive income threshold Since 2019, the business limit itself can be reduced based on how much passive investment income the corporation (and any [associated corporations](https://www.everstonecpa.com/glossary#associated)) earned in the *prior* tax year. The CRA measures this using a figure called **adjusted aggregate investment income (AAII)**, which generally includes: - Interest income - Rental income - Portfolio dividends from corporations you don’t control or aren’t connected to - Taxable capital gains, net of allowable capital losses for the year - Certain foreign investment income Dividends from connected corporations and net capital losses carried from other years are generally excluded from the calculation. The first **$50,000** of AAII in a year has no effect on the following year’s business limit — it’s only the amount above $50,000 that triggers the grind. ## How the grind works For every $1 of AAII above the $50,000 threshold, the $500,000 business limit is reduced by $5. That ratio means the business limit hits zero well before passive income reaches anything close to $500,000 — specifically, at **$150,000** of AAII. How adjusted aggregate investment income grinds down the $500,000 small business limit | Passive income (AAII) | Reduction to business limit | Business limit remaining | | $50,000 or less | $0 | $500,000 (full) | | $75,000 | $125,000 | $375,000 | | $100,000 | $250,000 | $250,000 | | $130,000 | $400,000 | $100,000 | | $150,000 or more | $500,000 | $0 | Not sure how this applies to you? Every corporation’s situation is different. Send an enquiry to a CPA and get a straight answer, plus a fixed quote before any work starts. [Send an Enquiry →](https://www.everstonecpa.com/book-online?service=planning#enquiry-form) [See fixed fees](https://www.everstonecpa.com/pricing) ## The real cost of losing the deduction The dollars add up quickly. If your corporation’s AAII grinds away $100,000 of business limit, that $100,000 of active business income is now taxed at the general combined BC rate of roughly 27% instead of the small business rate of roughly 11%. That is a difference of about $16,000 in extra corporate tax on that slice of income alone, in the year the reduced limit applies. Because the calculation runs off the *prior* year’s AAII, the impact often surprises owners a full year after the passive income was earned. ## Association rules Owners sometimes ask whether opening a second corporation lets them claim two $500,000 limits. It doesn’t. Associated corporations — generally those under common control by the same person, related persons, or with significant cross-ownership — must share one business limit between them, and their combined AAII is what’s tested against the $50,000 threshold. A holding company structure can still be useful for isolating passive investments from an operating company, but it doesn’t create extra SBD room on its own. ## Practical planning Because the grind is based on investment income sitting inside the corporation, the most direct fix is limiting how much surplus cash accumulates there as passive investments in the first place. Options worth discussing with your accountant include: - Paying out surplus cash as [salary or dividends](https://www.everstonecpa.com/blog/salary-vs-dividends-2026) rather than letting it compound as corporate investments - Using a separate holding company to isolate investment assets and manage timing - Timing the realization of capital gains across tax years to smooth out AAII - Reviewing outstanding [shareholder loan](https://www.everstonecpa.com/blog/shareholder-loans-canada-taking-money-out-of-corporation) balances and withdrawal timing as part of an overall cash-out strategy - Modelling the trade-off between retaining cash for growth versus the passive-income cost of leaving it invested inside the corporation Because this calculation uses the prior year’s numbers to set the current year’s limit, the window to plan around it is usually before your corporate year-end, not after you’ve already filed. ## Bottom line The Small Business Deduction is one of the most valuable tax features available to Canadian-controlled private corporations, but it isn’t unconditional. Once a corporation’s passive investment income crosses $50,000 in a year, every additional dollar starts costing five dollars of business limit the following year, and the gap between the small business rate and the general rate is wide enough to matter. If your corporation is accumulating cash and investments, it’s worth reviewing the AAII calculation with your accountant before it quietly erodes your rate. The same grind applies across an associated group, which is one of the things to weigh before deciding [whether multiple corporations make sense](https://www.everstonecpa.com/blog/multiple-corporations-when-it-makes-sense). Our [tax services](https://www.everstonecpa.com/tax-services) and [business advisory](https://www.everstonecpa.com/advisory-services) work can model your specific numbers and structure. This article is general information, not tax advice — confirm your specific situation with EverStone CPA. Sources - [Canada Revenue Agency — Corporation income tax](https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/corporations.html) - [Canada Revenue Agency — Small businesses and self-employed income](https://www.canada.ca/en/revenue-agency/services/tax/businesses/small-businesses-self-employed-income.html) The underlying tax treatment of that passive income is worth understanding on its own terms — see [how investment income is taxed inside a CCPC](https://www.everstonecpa.com/blog/investment-income-in-a-corporation-canada). About this article **EverStone CPA** Prepared and reviewed by a Chartered Professional Accountant at EverStone CPA, a CPA firm working with small and midsized businesses in BC, Alberta, Ontario and Manitoba. [About the firm →](https://www.everstonecpa.com/about) · [Send an enquiry →](https://www.everstonecpa.com/book-online?service=planning#enquiry-form) If the answer is to pay more out of the company, the [salary vs dividends calculator](https://www.everstonecpa.com/salary-vs-dividends-calculator) compares the two routes. ### Related articles [Tax services →](https://www.everstonecpa.com/tax-services) [Business advisory →](https://www.everstonecpa.com/advisory-services) [Shareholder loans →](https://www.everstonecpa.com/blog/shareholder-loans-canada-taking-money-out-of-corporation) [Salary vs. dividends 2026 →](https://www.everstonecpa.com/blog/salary-vs-dividends-2026) [Associated corporations & the SBD →](https://www.everstonecpa.com/blog/associated-corporations-small-business-deduction)[Pension Income Splitting in Canada: How It Works →](https://www.everstonecpa.com/blog/pension-income-splitting-canada) FAQ ## Frequently asked questions **What is the Small Business Deduction (SBD)?** The Small Business Deduction reduces the federal corporate tax rate from 15% to about 9% on the first $500,000 of active business income earned each year by a Canadian-controlled private corporation. In British Columbia the combined federal-and-provincial small business rate is roughly 11%, versus roughly 27% on income that doesn’t qualify. **What counts toward the $50,000 passive income threshold?** The threshold is based on adjusted aggregate investment income, which generally includes interest, [rental income](https://www.everstonecpa.com/rental-income-tax-return), portfolio dividends from unconnected corporations, taxable capital gains net of allowable capital losses, and certain foreign income, less related expenses and net capital losses carried over. Dividends received from connected corporations are generally excluded. **How much does passive income reduce my business limit?** For every dollar of adjusted aggregate investment income above $50,000 in the prior year, the corporation’s $500,000 business limit for the current year is reduced by $5. The business limit reaches zero once passive income hits $150,000, meaning none of the corporation’s active business income would qualify for the reduced rate that year. **Do associated corporations each get their own $500,000 limit?** No. Corporations that are associated for tax purposes must share a single $500,000 business limit, allocated between them by agreement filed with the CRA. Passive investment income earned across the associated group is also combined when testing against the $50,000 threshold. **What can I do to protect my Small Business Deduction?** Common strategies include paying out surplus cash as salary or dividends rather than letting it accumulate as corporate investments, using a separate holding company to isolate investment assets, and timing the realization of capital gains. Because the calculation uses the prior year’s investment income, planning generally needs to happen before the threshold is crossed, not after. **Why does last year’s passive income affect this year’s business limit?** Because the grind is calculated from the prior year’s adjusted aggregate investment income. The passive income a corporation earns in one year sets the business limit available in the next. That lag is why the effect often surprises owners a full year after the fact, and why the planning window is before a year-end rather than after the return is filed. **What kinds of income count as adjusted aggregate investment income?** Broadly, portfolio dividends from corporations you neither control nor are connected to, taxable capital gains net of allowable capital losses for the year, and certain foreign investment income. Dividends from connected corporations and net capital losses carried in from other years are generally excluded. The composition matters, because two corporations holding similar cash can land very differently. ## Not sure if the passive income rule affects you? Tell us roughly what the company holds in investments. A CPA replies by email within one business day with whether the limit is at risk and a fixed fee. [Get My Fixed Quote](https://www.everstonecpa.com/book-online?service=planning#enquiry-form)[Book a Paid Advice Call](https://www.everstonecpa.com/advice-call) **Run your own numbers with the free calculators:** [verify your payroll deductions](https://www.everstonecpa.com/payroll-deduction-calculator) · [estimate what you owe in GST/HST](https://www.everstonecpa.com/gst-hst-calculator) · [Incorporation savings calculator](https://www.everstonecpa.com/incorporation-calculator) [← Shareholders’ agreements: what they should cover on tax](https://www.everstonecpa.com/blog/shareholders-agreement-tax-implications) [Statutory holiday pay: who qualifies, how it is calculated, and where payroll goes wrong →](https://www.everstonecpa.com/blog/statutory-holiday-pay-canada-employers) ## Have a question about this? Ask it free through [the quick-question form](https://www.everstonecpa.com/quick-question) and a CPA replies by email within one business day. For something that needs a proper look, a one-off **Advice Call** is a paid 45-minute session with a Chartered Professional Accountant: $225 plus GST, booked by email or phone with a secure payment link. It is credited against your first invoice if you become a client within 60 days. Looking for an accountant to take this on rather than an answer? [Send an enquiry](https://www.everstonecpa.com/book-online?service=planning#enquiry-form). [Ask a Free Question](https://www.everstonecpa.com/quick-question) [Book a Paid Advice Call](https://www.everstonecpa.com/advice-call) Email info@everstonecpa.com ★★★★★ “…have been completing my bookkeeping, taxes and financials for the last 2 years and they have been amazing. Thank you!” R. H. · Google review --- Source: https://www.everstonecpa.com/blog/small-business-deduction-passive-income-canada Prices: https://www.everstonecpa.com/pricing · Contact: info@everstonecpa.com · https://www.everstonecpa.com/book-online