- As a general rule, dividends paid from one taxable Canadian corporation to another are deductible in computing the recipient's taxable income.
- Without some kind of backstop, a private corporation could receive dividend income from another corporation, hold it indefinitely inside a holdco, and never have it taxed again at the…
- The key distinction: dividends from a connected corporation mostly only trigger Part IV tax to the extent the payer itself got a dividend refund on paying them, while dividends from an…
A lot of Ontario business owners set up a holding company assuming that dividends flowing up from their operating company into the holdco are simply tax-free, full stop. Usually that's close to right — but there's a special tax sitting in the background of the Income Tax Act, commonly called Part IV tax, designed specifically to stop that structure from becoming a way to defer personal tax forever.
If you're running a holdco, or thinking about setting one up as part of a corporate reorganization, it's worth understanding when Part IV tax shows up and how it gets recovered.
Why Dividends Between Canadian Corporations Are Usually Tax-Free
As a general rule, dividends paid from one taxable Canadian corporation to another are deductible in computing the recipient's taxable income. The policy reason is straightforward: corporate profit has already been taxed once at the paying corporation's level, and the system generally tries to avoid taxing the same profit again every time it moves up a chain of corporations before finally reaching an individual shareholder.
When Part IV Tax Steps In
Without some kind of backstop, a private corporation could receive dividend income from another corporation, hold it indefinitely inside a holdco, and never have it taxed again at the personal level — effectively parking investment-type income tax-free forever. Part IV tax exists to prevent exactly that. It's a special refundable tax that generally applies when a private corporation receives dividends from another corporation, with the analysis turning on whether the two corporations are "connected."
Connected vs. Unconnected Corporations
| Connected Corporations | Unconnected (Portfolio) Corporations | |
|---|---|---|
| Relationship | Control or a significant ownership relationship between payer and recipient | Arm's-length portfolio holding, no control relationship |
| Part IV tax generally applies | Only to the extent the paying corporation received its own dividend refund on that payment | Generally yes, on the dividend received |
| Typical Ontario example | Operating company paying dividends up to its own holding company | Corporation holding a portfolio of publicly traded shares |
The key distinction: dividends from a connected corporation mostly only trigger Part IV tax to the extent the payer itself got a dividend refund on paying them, while dividends from an unconnected, arm's-length corporation are more broadly exposed to it.
How Part IV Tax Is Recovered
Part IV tax isn't a permanent cost sitting with the recipient corporation forever. It flows into that corporation's own Refundable Dividend Tax on Hand pool and can be recovered the same way other refundable dividend tax is recovered — by the recipient corporation later paying its own taxable dividends out to its shareholders and claiming the corresponding refund.
In other words, Part IV tax and RDTOH work together as two halves of the same mechanism: tax now, refund later, once the money actually reaches an individual.
Holdco Structures and Part IV Tax Risk
- [ ] Multiple layers of holding companies passing dividends between each other before reaching an individual shareholder
- [ ] A passive investment portfolio held inside an affiliate of an operating business rather than directly by the operating company
- [ ] Family holding companies receiving dividends from an operating company after a business sale, without a plan for eventually distributing them
- [ ] Related corporations that assume "connected" status automatically without checking the actual ownership relationship
Working Through It Before You Restructure
- Map out the full corporate chain — every entity that dividends might flow through before reaching a person.
- Identify which relationships are "connected" and which are arm's-length portfolio holdings.
- Coordinate with your accountant on projected Part IV tax and RDTOH consequences before implementing a reorganization.
- Get legal review of the reorganization agreements themselves — the corporate mechanics need to match the tax plan, not just approximate it.
Frequently asked questions
Does Part IV tax apply to dividends between a related operating company and its own holdco?
It depends on whether they're "connected" and, if so, whether the operating company received its own dividend refund on paying the dividend. Related companies aren't automatically exempt — the analysis still needs to be done.
Is Part IV tax a permanent cost to the corporation that pays it?
No — it's generally refundable to the recipient corporation once that corporation pays out its own dividends, similar to how RDTOH works more broadly.
Does Part IV tax apply to dividends from a small portfolio of public company shares?
Generally yes, since public shares held as a portfolio investment are typically unconnected to the holding corporation. The specific analysis still depends on the size and nature of the holding.
Do I need a full corporate reorganization to manage Part IV tax exposure?
Not necessarily. Often it comes down to planning dividend timing and correctly understanding connected-corporation status, rather than restructuring the corporate chain itself — though a reorganization is sometimes the right answer depending on the goals.
This is a tax question
Start a file online — flat, published fees, reviewed by a licensed Ontario lawyer before a dollar is owed.