What Is Passive Income in a Corporation?
Passive income in a corporate context refers to investment earnings the corporation receives that are not from its core active business operations. Common examples:
- Interest on savings, GICs, bonds held inside the corporation
- Rental income from properties not used in the active business
- Capital gains on investment securities (50% taxable portion)
- Foreign dividends received
- Income from an investment portfolio built up inside the corporation
When a Canadian-controlled private corporation (CCPC) accumulates cash and invests it, the resulting passive income can trigger the Small Business Deduction grind — one of the most significant tax traps for successful incorporated business owners.
The Small Business Deduction Refresher
The Small Business Deduction (SBD) reduces the federal corporate tax rate from ~15% to ~9% on the first $500,000 of active business income for a CCPC. With provincial SBD, combined rates are typically:
| Province | Combined SBD Rate | Combined General Rate |
|---|---|---|
| Ontario | 12.2% | 26.5% |
| British Columbia | 11.0% | 27.0% |
| Alberta | 11.0% | 23.0% |
| Manitoba | 9.0% | 27.0% |
| Quebec | 12.2% | 26.5% |
Losing the SBD means your active business income is taxed at the general corporate rate — roughly 14–18 percentage points higher. On $500,000 of income, that’s $70,000–$90,000 more in corporate tax annually.
How the Passive Income Grind Works
The grind is based on the prior year’s Adjusted Aggregate Investment Income (AAII):
$$\text{SBD Limit Reduction} = (\text{Prior Year AAII} - $50,000) \times 5$$
| Prior Year AAII | SBD Limit | Effective |
|---|---|---|
| $50,000 or less | $500,000 | Full SBD available |
| $60,000 | $450,000 | Partial grind |
| $80,000 | $350,000 | Significant grind |
| $100,000 | $250,000 | Half SBD remaining |
| $150,000 | $0 | SBD fully eliminated |
The $500,000 SBD limit is also shared across associated corporations.
What Counts as AAII (and What Doesn’t)
Included in AAII
| Income Type | Included? |
|---|---|
| Interest (bank, GIC, bonds) | Yes |
| Rental income from investment property | Yes |
| Capital gains — taxable portion only (50%) | Yes |
| Foreign dividends | Yes |
| Portfolio dividends from unrelated Canadian public companies | Yes |
Excluded from AAII
| Income Type | Excluded? |
|---|---|
| Dividends from a connected CCPC (inter-corporate) | Yes — excluded |
| Capital gains on qualifying small business corporation shares | Yes — excluded |
| Active business income (even if “passive-seeming,” like rent from a business tenant in a related corp) | Yes — if meets active test |
The inter-corporate dividend exclusion is why a holding company structure can neutralize the passive income grind.
Tax Rate on Passive Income Inside a Corporation
Passive income inside a CCPC is taxed at the general corporate rate (not SBD). But the tax story is more nuanced:
| Province | Tax Rate on Corporate Passive Income | Refundable Tax (REFUNDABLE RDTOH) |
|---|---|---|
| Federal | ~38.67% (includes Part I tax + Part IV) | Yes — Refundable Dividend Tax on Hand (RDTOH) mechanism refunds tax when dividends are paid out |
The RDTOH mechanism means corporate passive income tax is partially recoverable when you eventually pay dividends. The combined corporate + personal tax is designed to roughly equal personal rates — but timing differences and the passive income grind consequences make this costly for active business CCPCs.
Strategies to Manage the Passive Income Grind
1. Cap Passive Income Below $50,000/Year
Keep corporate investment income under $50,000 annually to avoid any grind. This may mean:
- Paying out more as dividends/salary and investing personally via TFSA/RRSP
- Delaying realization of capital gains inside the corporation
- Spacing out large investment income events
2. Move Passive Investments to a Holding Company
Pay a tax-free inter-corporate dividend from the operating company to a holding company. The holding company then invests the funds. Dividends between connected CCPCs are excluded from AAII, so the operating company’s SBD is not affected.
Caution: The holding company still pays tax on its own passive income. The benefit is insulating the operating company’s SBD.
3. Invest Inside Life Insurance (Exempt Policy)
Contributions to a permanent life insurance policy (whole life or universal life) inside or outside a corporation can grow tax-sheltered. The policy may be exempt from accrual taxation if structured properly. This is a common strategy for incorporated professionals with large passive accumulations.
4. Pay Out Passive Income as Salary or Dividends
Withdrawing retained earnings as personal income reduces the corporate investment pool — and future AAII. This triggers personal tax now but may be worth it mathematically if the grind is already costing corporate tax at a higher rate.
5. Refundable Dividend Tax on Hand (RDTOH)
When the corporation pays non-eligible dividends, it gets a refund of previously-paid RDTOH at a rate of $38.33 per $100 of non-eligible dividends paid. This is an automatic mechanism — no special strategy required — but understanding it helps model the real after-tax cost of investing inside a corporation.
Integration Check: Is It Better Inside or Outside the Corporation?
The theoretical answer (full integration) is that it doesn’t matter. In practice:
| Factor | Inside Corporation | Outside (personal RRSP/TFSA) |
|---|---|---|
| Tax rate on passive income | ~50.17% (before RDTOH) | Personal marginal rate (up to 53.5% in Ontario) |
| SBD grind risk | Yes (if >$50K AAII) | No |
| RDTOH recovery | Yes | N/A |
| Investment flexibility | Yes | RRSP/TFSA have limits |
| Tax-free withdrawal option | Capital Dividend Account | TFSA (unlimited withdrawal) |
For most CCPC owners, maximizing TFSA and RRSP first before accumulating passive income inside the corporation is the lowest-friction approach.