There’s a tax rule that quietly hits incorporated professionals and business owners who’ve been successful at building wealth inside their corporations. It doesn’t show up until you’ve already accumulated a few years of retained earnings, and by the time most people hear about it, they’ve already triggered it.<\/p>\n
It’s called the passive income grind on the small business deduction; and for many BC incorporated professionals earning above $200,000 or $300,000 a year, it’s worth understanding before it costs them the low corporate tax rate they’ve been counting on.<\/p>\n
Canadian-controlled private corporations (CCPCs) get access to the small business deduction, a preferential federal tax rate of 9% on the first $500,000 of active business income, combined with BC’s provincial small business rate of 2%. That combined rate of roughly 11% is the foundation of the tax deferral strategy that makes incorporation powerful in the first place.<\/p>\n
Earn income through your corporation at 11%, leave the after-tax amount invested, and only pay personal tax when you eventually draw it out. Compare that to earning the same income personally at 45\u201353%, and the deferral advantage is obvious.<\/p>\n
But the $500,000 limit at the 11% rate isn’t guaranteed. Since 2019, it can be reduced (or eliminated entirely) if the corporation earns too much passive investment income.<\/p>\n
The rule, set out in subsection 125(5.1) of the Income Tax Act, works like this: for every dollar of adjusted aggregate investment income (AAII) your corporation earns above $50,000, the small business deduction limit is reduced by $5.<\/p>\n
Run the math: if your corporation earns $150,000 in passive investment income (interest, dividends, rent, capital gains) in a given year, that’s $100,000 above the $50,000 threshold. Multiply by five, and the small business deduction limit drops by $500,000. Gone entirely. Your first $500,000 of active business income now gets taxed at the general corporate rate, which in BC runs closer to 27%.<\/p>\n
The difference between 11% and 27% on $500,000 is $80,000 in additional corporate tax. In one year. On top of whatever personal tax you eventually pay when you draw the money out.<\/p>\n
Not all passive income counts the same way. The AAII calculation includes most investment income earned inside the corporation: interest, foreign dividends, rental income, and the taxable portion of capital gains. It excludes dividends from connected corporations (to avoid double-counting in corporate groups) and the portion of capital gains sheltered by the lifetime capital gains exemption.<\/p>\n
A corporation with $1.5 million in a balanced investment portfolio earning a 4\u20135% return generates $60,000\u2013$75,000 in annual income, enough to start triggering the grind. Many incorporated professionals hit this threshold faster than they expect, particularly if they’ve been retaining earnings for several years without a structured drawdown plan.<\/p>\n
If you own multiple corporations or have associated companies, the $50,000 threshold is shared across all of them. You can’t simply split your retained earnings across two corporations to double the room. CRA aggregates passive income from associated corporations and applies the grind on the combined figure.<\/p>\n
The passive income grind creates a planning challenge; but it’s not unavoidable. There are several legitimate ways to manage it.<\/p>\n
Invest in assets with lower annual income.<\/strong> The grind is triggered by annual investment income, not unrealized growth. A portfolio tilted toward growth equities or low-yield assets may generate less AAII than a bond-heavy or dividend-heavy portfolio of the same size, while the underlying value still compounds.<\/p>\n Draw down the investment account over time.<\/strong> If the corporation’s passive income is consistently near or above $50,000, accelerating the drawdown, through dividends, salary, or IPP contributions, can reduce the invested capital and bring the annual income below the threshold.<\/p>\n Use corporate-owned life insurance (COLI).<\/strong> The investment component inside an exempt life insurance policy generally doesn’t generate AAII. Permanent life insurance held by the corporation (structured correctly) can shelter a meaningful portion of retained earnings from the passive income calculation while building tax-advantaged value. This is one of the reasons COLI is genuinely useful as a planning tool, not just a product pitch.<\/p>\n Individual Pension Plan (IPP) contributions.<\/strong> Contributions to an IPP funded through the corporation reduce the corporation’s taxable income, including its capacity to generate passive investment income over time. It’s a long-term solution, but it addresses the root cause, too much money sitting in a taxable corporate account.<\/p>\n Pay yourself more, strategically.<\/strong> If the corporation’s investment account is growing faster than you can reasonably deploy it, increasing compensation in high-income years, through additional salary, dividends, or a combination, reduces the retained earnings that eventually generate passive income.<\/p>\n The passive income grind feels punishing, but there is a partial relief mechanism built into the tax system: the Refundable Dividend Tax on Hand (RDTOH) account.<\/p>\n When a corporation pays tax on passive investment income, specifically interest, foreign dividends, and taxable capital gains, a portion of that tax (generally the refundable portion, which has been running at about 30.67% on eligible investment income) is credited to the RDTOH account. When the corporation pays a taxable dividend to shareholders, it can recover that refundable tax, meaning part of the corporate tax on passive income is eventually returned.<\/p>\n This doesn’t eliminate the problem, but it does mean the passive income isn’t taxed twice at the full corporate rate if the income is eventually distributed. It’s a deferral cost, not a permanent double-tax.<\/p>\n The small business deduction limit starts being reduced when your corporation earns more than $50,000 in adjusted aggregate investment income (AAII) in a year. For every dollar above $50,000, the SBD limit drops by $5. At $150,000 of passive income, the entire $500,000 small business deduction is eliminated, and all active business income is taxed at the general corporate rate, roughly 27% in BC versus the small business rate of about 11%.<\/p>\n<\/div>\n AAII is the measure of passive investment income that triggers the small business deduction grind. It includes interest, foreign dividends, rental income from passive properties, and the taxable portion of capital gains. It excludes dividends from connected Canadian corporations and capital gains sheltered by the lifetime capital gains exemption.<\/p>\n<\/div>\n In most cases, the accumulating value inside an exempt life insurance policy held by a corporation does not generate AAII, because investment growth inside an exempt policy is not considered income for tax purposes. This makes properly structured COLI a useful tool for sheltering retained earnings from the passive income grind, in addition to its other planning functions.<\/p>\n<\/div>\n The passive income grind reduces the small business deduction limit, which affects how much of your active business income qualifies for the low 11% combined rate. Passive income itself is taxed separately, largely at the general corporate rate, with a refundable component tracked through the RDTOH account. The two streams interact but are calculated independently.<\/p>\n<\/div>\nThe RDTOH mechanism: partial relief<\/h2>\n
Frequently Asked Questions<\/h2>\n
How much passive income can my corporation earn before losing the small business deduction?<\/h3>\n
What is adjusted aggregate investment income (AAII)?<\/h3>\n
Does corporate-owned life insurance count toward passive income?<\/h3>\n
If my corporation has both active business income and passive income, which is taxed first?<\/h3>\n