By OptiVal Editorial Desk
So your corporation is sitting on extra cash. Maybe the operating company had a good year, or you’ve been keeping earnings inside for a while. The money piles up in a business chequing account earning next to nothing, and you start wondering: can I just invest it inside the company?
Yes. Plenty of incorporated owners do exactly that, often through a holding company. But investing through a corporation follows tax rules that look nothing like a TFSA or RRSP. (If you haven’t sorted out the registered-account side, start with our guide to RRSP vs TFSA when you’re incorporated.) Here’s how the corporate side actually works.
What a holding company actually is
A holding company is a corporation whose main job is owning things: shares of other companies, a portfolio of investments, sometimes real estate. It doesn’t sell anything or serve customers. The usual setup: your operating company pays tax-free dividends up to the holdco, and the holdco does the investing.
Why add the extra company? Two reasons most owners care about:
Creditor protection. Money parked in a separate holdco is harder for creditors to reach if the operating business hits trouble. This is a legal question as much as a tax one, so get a lawyer’s view before counting on it.
Clean separation. The operating company’s books stay about the business. The investing happens somewhere tidy and separate.
How investment income is taxed inside a corporation
This is the part that surprises people. Investment income inside a Canadian-controlled private corporation is taxed at a high rate up front, roughly 50% in Ontario. That’s deliberate. The system is built so you can’t use a corporation as a personal tax shelter.
But a good chunk of that tax is refundable. When the corporation pays dividends out to you, it recovers some of that tax through a mechanism called RDTOH (refundable dividend tax on hand). Once everything flows through to you personally, the total tax lands roughly where it would have if you’d earned the income directly. Roughly is doing a lot of work in that sentence, but that’s the design.
Each type of investment income gets its own treatment:
Interest income
Interest is the worst deal inside a corporation. It’s fully taxable, it counts dollar for dollar toward the $50,000 passive income threshold (more on that below), and it’s taxed at the full corporate investment rate. A holdco stuffed with GICs is about as tax-inefficient as investing gets.
Canadian dividends
Eligible dividends your corporation receives from Canadian public companies are taxed at a lower corporate rate, around 38% in Ontario, and that tax is refundable when the corporation pays eligible dividends out to you. Of all the investment income types, Canadian dividends integrate the cleanest inside a corporation.
Capital gains
Only half the gain is taxable. The proposed increase to a two-thirds inclusion rate was cancelled in March 2025, so the 50% inclusion rate still stands. A $100,000 gain means $50,000 of taxable income. The other $50,000, the non-taxable half, lands in the capital dividend account, and it can eventually be paid out to you completely tax-free. That’s one of the genuinely useful features of corporate investing.
Foreign dividends: watch out
Dividends from US stocks are taxed like interest at the corporate level, roughly 50%, and the 15% US withholding tax is generally not recoverable inside a corporation the way it is inside an RRSP. This is one of the biggest quiet costs of holding US dividend stocks in a holdco, and a lot of owners don’t find out until their accountant explains the T2.
The $50,000 passive income rule that catches people off guard
This is the rule that delivers the most bad news at year end. If your corporation and its associated corporations earn more than $50,000 of adjusted aggregate investment income in a year, the federal small business deduction starts getting ground down. Every dollar over $50,000 costs you $5 of the $500,000 small business limit. At $150,000 of passive income, the federal small business deduction is gone entirely, and your active business income gets taxed at the higher general corporate rate instead.
Two things worth knowing:
Moving investments into a separate holdco does not dodge this. The $50,000 threshold is measured across the whole associated corporate group. A holdco gives you creditor protection and organization, not a way around the grind.
Ontario doesn’t follow the federal rule for its own provincial deduction. You can lose the federal small business deduction while keeping Ontario’s lower provincial rate. Messy, but that’s the system.
One practical note: only realized gains count, and only the taxable half. Unrealized growth in the portfolio doesn’t trigger anything. The mix of what you hold and when you sell matters more than the size of the account.
When holding company investing actually makes sense
Given all of that, why would anyone do it? Because the alternative costs tax right now. To invest personally, you first pay the money out to yourself as salary or dividends, pay personal tax on it, and invest what’s left. (The pay-mix decision matters here too; we covered how salary vs dividends affects your RRSP room.) If you don’t need the cash personally, leaving it inside the corporation to compound, even at high corporate investment tax rates, can still come out ahead because of the deferral.
It also makes sense when the operating company keeps producing more cash than you need to live on, and you want that surplus working somewhere separate from the risks of the business.
To actually do it, you’ll open a non-registered corporate account at a brokerage.
Getting money out, and what to watch for
Money leaves the holdco the same way it leaves any corporation: dividends to you, taxed in your hands. A few planning points:
Pay eligible dividends to the extent the corporation has a GRIP balance, so you get the better personal tax treatment on the way out.
Don’t forget the capital dividend account. The tax-free half of your capital gains can be paid out without personal tax, but only if someone actually files the election. Plenty of owners leave CDA balances sitting unused for years.
Keep proper books. A holdco with sloppy records, mixed personal and corporate transactions, or undocumented shareholder loans is an audit headache waiting to happen.
Common mistakes
Treating the holdco like a personal chequing account. Every dollar moving between you and the corporation needs documentation.
Loading up on US dividend stocks without understanding the withholding tax drag.
Ignoring the $50,000 threshold until the accountant delivers the bad news.
Setting up the structure and then skipping the maintenance: annual resolutions, separate bank and brokerage accounts, clean bookkeeping.
The bottom line
A holding company is a reasonable home for surplus corporate cash, but it’s not a magic tax shelter. The tax system is designed so corporate investing roughly integrates with personal investing. The real wins are deferral, creditor protection, and keeping business money and investment money cleanly separated.
Want more plain-English guides? Browse the Learn hub.
This article is general information for educational purposes. It is not financial advice and does not recommend any specific investment. Consider speaking with a licensed professional about your own situation.
