Over $50,000 of Investment Income in Your Corporation: The Effect on the Small Business Rate

How passive income affects the small business rate, and how to plan for it

Scott Tang, CPAUpdated 2026-11-052026 rules4 min read

It is common for a small corporation to keep its profits and invest them inside the company. But if the corporation (together with its associated corporations) has more than C$50,000 of adjusted aggregate investment income (AAII) in a year, its small business limit is reduced the following year; at $150,000 or more, the limit is gone entirely. The good news: the Ontario small business rate is not reduced along with it — the effect is mainly on the federal portion.

$50,000

Once the previous year's passive investment income exceeds $50,000, the small business limit starts to shrink

Each extra $1 of passive income reduces the small business limit by $5

$150,000

When passive income reaches $150,000, the $500,000 small business limit falls to zero

Ontario: no reduction

The Ontario small business rate is not affected by this rule

How the limit is reduced

1
Work out last year's AAII
Interest, rent and investment income (capital gains at half); some capital gains, business assets and dividends from corporations are excluded or adjusted
2
Subtract $50,000
The amount above it
3
× 5
The reduction in the small business limit
4
$500,000 − the reduction
The profit that can still be taxed at the small business rate this year

Example: The corporation's passive income last year was $80,000. The excess over $50,000 is $30,000, and $30,000 × 5 = $150,000. This year's small business limit = $500,000 − $150,000 = $350,000.

How big the effect is in Ontario

Item	Business profit within the limit	Business profit no longer covered by the limit
Federal rate	9%	15%
Ontario rate	Small business rate (2.2% from 2026-07-01)	Still the Ontario small business rate
Combined (approx.)	About 11.2%	About 17.2%

So in Ontario, profit that loses the limit pays about 6 percentage points more tax, rather than jumping straight to the 26.5% general rate. These figures use the rates in effect from July 1, 2026; for a corporate tax year that straddles that date, the rates are prorated by the number of days, and the result is also affected by other reductions, such as a limit shared with associated corporations.

How to plan

Capital gains count at half
Capital gains are counted at half in passive income, so investments geared to growth with few distributions produce a lower passive income figure.
Control the timing
For large capital gains, see whether they can be realized over several years, so that no single year spikes too high.
Individual pension plan (IPP)
A pension plan the corporation sets up for a shareholder who is also an employee; the income earned inside it doesn't count as passive income.
Corporate-owned life insurance
Growth inside a qualifying policy generally doesn't count as passive income; see "The Tax Role of Life Insurance in Passing On Wealth" in this series.
Pay the money out
Money the corporation doesn't need can be paid out to shareholders according to a plan and invested personally (personal tax has to be factored in).
Associated corporations are counted together
A holding company set up to hold the investments is generally counted together with the operating company, so it can't be used to get around the rule.

Points to watch

Investment income is already taxed heavily in a corporation
A corporation's passive investment income is taxed at about 50% in Ontario, and part of that is refunded when dividends are paid to shareholders. Compare it with investing personally by looking at the whole picture.
It's based on the previous year
This year's small business limit depends on the passive income of the previous tax year, so what you do this year affects next year.
CCPCs only
This rule only affects Canadian-controlled private corporations (CCPCs) that can use the small business rate.

How Sheng Qian CPA can help

A calculation every year
When preparing the T2, we total passive income across associated corporations and estimate next year's small business limit.
Structure before you invest
Whether to keep money in the corporation or pay it out, and what types of investments to hold — we work through the numbers with you from a tax perspective.
Working with your investment adviser
Your adviser decides on the specific investments, and we provide the tax numbers; for prices, see "What Sheng Qian CPA Can Do for Investors: Tax Returns, Accounts and Annual Planning" in this series.

Sources

Disclaimer

This article is general information only and is not tax or investment advice. Every company's situation is different; please consult a CPA about your specific arrangements. Service fees are as set out in our written quote.