What is passive income?
Passive income is money a corporation earns from investments rather than its core business operations — things like interest, rental income, portfolio dividends, and taxable capital gains earned inside the corporation, for example from a holding company’s investment portfolio. A holding company’s passive portfolio commonly includes interest, dividends from portfolio holdings, net rental income, and taxable capital gains.
What is the passive income tax rule?
Since 2019, if your CCPC (or any associated corporation) earns more than $50,000 of adjusted aggregate investment income (AAII) in the prior year, the federal $500,000 small business deduction limit is reduced by $5 for every $1 of AAII over $50,000. At $150,000 of AAII the SBD is gone entirely, and all active business income is taxed at the general rate. This is meant to discourage CCPCs from being used purely as passive investment vehicles.
Timing matters: it is the prior year’s AAII that determines the current year’s business limit — a large capital gain realized in 2025 will not reduce your SBD until 2026.
How much passive income can a corporation earn before losing the SBD?
Under $50,000 of AAII — no impact, the full $500,000 SBD limit is preserved.
Between $50,000 and $150,000 — the $500,000 limit shrinks by $5 for every $1 above $50,000. For example, earning $60,000 of passive income — $10,000 above the threshold — reduces the following year’s small business deduction limit by $50,000, dropping eligibility from $500,000 to $450,000.
At $150,000 or more — the small business deduction is completely eliminated, increasing the federal tax rate from 9% to 15% on all active business income up to $500,000.
The financial hit is real: losing the full SBD on $500,000 of active business income costs an additional $30,000 federally, and $60,000–$80,000 or more once provincial taxes are factored in, depending on the province.
Note that this is a group-level test — the AAII and taxable capital tests look at associated corporations too, so you do not get $500,000 per corporation if companies are associated; the limit is shared.
What is the Capital Dividend Account (CDA)?
The CDA is a notional, or tracking, account that lets a private corporation pay certain amounts — such as the non-taxable half of capital gains — out to Canadian resident shareholders as a tax-free capital dividend. It is a key tool because it lets business owners extract value without triggering personal tax, and drawing down the CDA can also help shrink the passive asset base that drives future AAII.
How can the passive income rule affect you?
If you run a CCPC and build up retained earnings inside the company — common for business owner-managers saving for retirement or a rainy day — exceeding the $50,000 AAII threshold means:
Your corporation’s low small-business tax rate shrinks or disappears on active income, not just on the passive income itself. This is the part people underestimate.
The tax hit feels retroactive in effect, since it is based on the prior year’s investment income — so a good year for the portfolio can raise your business’s ordinary tax bill the following year.
It compounds if you have associated companies, since the AAII and limits are tested at the group level.
