Guide for Incorporated Owners
Investing inside your corporation, or personally
The surplus cash question every successful owner eventually asks, answered with the real 2025 Ontario rates.
Successful owners eventually face a good problem: surplus cash building inside the corporation. Investing it inside the company feels natural, and sometimes it is the right move. But corporate investing plays by different tax rules than personal investing, and the differences are large enough to plan around. Here is the honest picture, in plain language.
First principle: registered accounts usually come first
Before comparing corporate and personal non registered investing, one principle guides most plans: TFSAs and RRSPs, where you have room, usually beat both, because growth in a TFSA is never taxed and RRSP deductions shelter income at your full personal rate. Corporate investing is generally the conversation for surplus beyond registered room, and for money the business genuinely needs to keep inside the company. The sections below compare the two non registered routes.
The comparison
| Question | Inside the corporation | Personally |
|---|---|---|
| Where the money comes from | Active business income taxed at 12.2% combined (2025, small business rate in Ontario, first $500,000) leaves roughly 88 cents of every dollar available to invest right away. That larger starting amount is the corporation's famous advantage: tax deferral. | Money paid out as salary or dividends is taxed personally first, at rates up to 53.53% on salary and 47.74% on non eligible dividends at the top (2025), leaving less to invest today. |
| Tax on investment income as it is earned | Passive investment income in a Canadian controlled private corporation is taxed at about 50.17% combined in Ontario (2025), close to the top personal rate by design. Interest, rent, and foreign income fall here, along with the taxable half of capital gains. | Taxed at your personal marginal rates: interest and other income up to 53.53%, capital gains at half those rates because only 50% of a gain is included in income, and eligible Canadian dividends up to 39.34% (2025, top rates in Ontario). |
| Refundable taxes (RDTOH), in plain language | Of that roughly 50.17% corporate passive tax, about 30.67 percentage points are refundable. The corporation tracks them in accounts called RDTOH (refundable dividend tax on hand). When the corporation pays you taxable dividends, it gets a dividend refund of $1 for every $2.61 of dividends paid, a 38.33% refund rate (2025). Think of it as a prepaid tax that comes back when the money finally flows out to you. | No equivalent. Personal tax paid is final. |
| Effect on the small business deduction | This is the trap to plan around. Federally, when a corporate group's adjusted aggregate investment income passes $50,000 in a year, the $500,000 small business limit is ground down by $5 for every $1 of investment income above $50,000, and it disappears entirely at $150,000. Losing the small business rate means active income is taxed at 26.5% instead of 12.2%. Ontario does not apply this passive income grind to its own small business deduction, but the federal grind alone is reason enough to watch the number. | Personal investing has no effect on your corporation's small business deduction. |
| Capital gains | Only half of a corporate capital gain is taxable, at the passive rates above. The non taxable half is added to the corporation's capital dividend account (below). | Only half of a personal capital gain is included in income, so the top effective rate in Ontario is 26.76% (2025). Personal gains also have the lifetime capital gains exemption available on qualifying small business shares, which corporate portfolios do not use. |
| The capital dividend account | A notional corporate account, the CDA, that tracks amounts the corporation received tax free, most notably the non taxable half of capital gains and proceeds of corporately owned life insurance above its cost base. Balances in the CDA can be paid to Canadian resident shareholders as capital dividends, which are tax free in the shareholder's hands, once the proper election is filed. It is one of the few genuinely tax free exits from a corporation. | Not applicable personally, though your own tax free accounts (TFSA, and the principal residence rules) play a similar role in a personal plan. |
| Getting the money out, in the end | Corporate investments eventually come out as dividends, taxed personally at dividend rates, with the corporation recovering its refundable taxes along the way. Through the integration system, total tax corporate plus personal is designed to land close to personal investing, with the corporation winning on deferral and losing on complexity, and sometimes losing outright when the small business grind bites. | Already in your hands. Withdrawals from non registered personal accounts trigger tax only on the gains and income the investments produce. |
All rates are 2025 Ontario combined federal and provincial rates. Corporate passive rates apply to a Canadian controlled private corporation; different rules apply to general rate income, connected corporations, and specified investment businesses.
Check the rest of your plan, too
Where the money sits is one piece of the plan. See how it reaches you in the salary and dividend calculator, then take the free Plan Gap Check to see which other areas of your plan are worth a look: tax, succession and exit, estate, and protection.
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So which route wins?
For money you will spend in the next few years, and for amounts that would push corporate passive income toward the $50,000 grind threshold, personal and registered investing usually come out ahead. For long term surplus that keeps passive income comfortably managed, corporate investing's deferral, starting with 88 cent dollars instead of heavily taxed personal dollars, can compound into a real advantage, and strategies such as corporately owned exempt life insurance exist partly because investment growth inside an exempt policy is not passive income for the grind. The answer is arithmetic plus judgment, and it changes as your income, your corporation, and the rules change. It is exactly the kind of question to run with your accountant and your financial professional at the same table.
Talk it through with Sean
Every situation has its own numbers. A free 30 minute conversation is the place to look at yours, with no obligation and no pressure.
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Methodology, assumptions, and sources
Rates shown are the 2025 combined federal and Ontario rates for a Canadian controlled private corporation with a December year end, and for an Ontario resident individual at the top marginal bracket where a top rate is quoted. The corporate passive rate of approximately 50.17% combines the federal Part I tax on investment income (including the additional refundable tax) with Ontario's corporate rate, and the refundable portion of approximately 30.67% and the 38.33% dividend refund rate are the CRA's published mechanics for 2025. The small business deduction grind described is the federal rule using adjusted aggregate investment income; Ontario does not grind its provincial small business deduction for passive income, which this page states where relevant. The capital gains inclusion rate is 50%: the increase to two thirds announced in 2024 was cancelled in 2025 and never applied to these figures. Associated corporations share limits and thresholds, year ends that straddle rate changes prorate, and personal services businesses and specified investment businesses follow different rules. This page is education, not tax advice.
Sources: Canada Revenue Agency, corporation income tax rates, refundable taxes and RDTOH pages, and the small business deduction rules including adjusted aggregate investment income; Ontario Ministry of Finance, corporate income tax; Department of Finance Canada, 2025 announcement cancelling the capital gains inclusion rate increase; Impact CPAs, 2025 year end tax planning tips for corporations (passive rate 50.17%, refundable portion 30.67%), cross checked against T2inc Ontario corporate rate summaries. Figures verified October 2026.
Run your own surplus through this lens
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Reach out during working hours (9:00 AM to 9:00 PM Eastern) and you will hear from Sean within 2 hours. Reach out after hours and you will hear from Sean within 2 hours of the next working period.