US Parent and Canadian Subsidiary Effective Tax Rate
Foreign control ends CCPC status, so the small business deduction is gone from day one. Work out the all-in Canadian cost of profits reaching your US parent, the thin capitalisation limit on intercompany debt, and what the lost deduction is actually worth.
effective Canadian rate
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The Canadian Tax Cost
| Item | Basis | Amount |
|---|
What Foreign Control Costs
| Position | Rate on the First $500,000 | Tax |
|---|
Thin Capitalisation
| Test | Your Position | Effect |
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Filing Obligations
| Form | When It Applies | Your Position |
|---|
Points That Decide This
What to Do Next
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Disclaimer: A corporation controlled by a non-resident is not a Canadian-controlled private corporation, so the small business deduction is unavailable and all active business income is taxed at the Ontario general rate of 26.5%. Dividends to a US parent are subject to Part XIII withholding, reduced by the Canada-United States treaty to 5% where the beneficial owner is a company holding at least 10% of the voting stock and is a qualifying person under the limitation on benefits article. The thin capitalisation rules in subsection 18(4) deny interest on debt to specified non-residents exceeding one and a half times equity, and subsection 214(16) treats the denied interest as a deemed dividend attracting withholding. Form T106 is required where reportable transactions with non-arm’s length non-residents exceed $1,000,000. This calculator addresses the Canadian side only and does not model the United States treatment of the subsidiary’s income, which requires United States advice. This page is general information, not tax advice.
Foreign Control Ends the Small Business Deduction Immediately
A Canadian corporation controlled by a US parent is not a Canadian-controlled private corporation. The small business deduction is a CCPC-only benefit, so it is gone from the first dollar and from the first day.
| On the First $500,000 of Active Income | Rate | Tax |
|---|---|---|
| A Canadian-owned CCPC | 11.2% | $56,000 |
| Your US-owned subsidiary | 26.5% | $132,500 |
| The annual difference | $76,500 |
That figure has grown, not shrunk. Ontario cut its small business rate from 3.2% to 2.2% on 1 July 2026, taking the combined CCPC rate to 11.2%. The gap between a Canadian-owned company and a US-owned one on the same first $500,000 is now $76,500 a year rather than $71,500.
The All-In Rate Is Just Over Thirty Percent
| On $800,000 of Canadian Profit | Amount |
|---|---|
| Canadian corporate tax at 26.5% | $212,000 |
| Treaty withholding at 5% on the dividend | $29,400 |
| Total Canadian tax | $241,400 |
| Effective Canadian rate on fully repatriated profit | 30.18% |
| Effective rate if nothing is repatriated | 26.50% |
The withholding layer costs 3.68 points and only applies when money actually moves. A subsidiary reinvesting in Canada pays 26.5% and nothing more until it distributes.
Thin Capitalisation Punishes Twice
Funding the subsidiary with intercompany debt rather than equity is the obvious way to strip profits out as deductible interest. The thin capitalisation rules cap that at a debt-to-equity ratio of one and a half to one.
Interest above the ratio is denied as a deduction and then treated as a deemed dividend. So you lose the deduction at 26.5% and pay withholding at 5% on the same amount. On $3,000,000 of debt against $1,000,000 of equity, $90,000 of interest is denied, costing $23,850 in extra corporate tax and $4,500 in withholding, and pushing the effective rate from 30.18% to 33.72%.
Management Fees Need Documentation, Not Just an Invoice
Charging a management fee from the US parent moves profit out of Canada as a deduction. It is also the first thing a transfer pricing auditor looks at, and the most common adjustment on a file like this.
- The services must genuinely be delivered, with evidence of who did what.
- The charge must be at arm’s length, benchmarked rather than assumed.
- Contemporaneous documentation must exist by the T2 filing due date, or the section 247 penalty of 10% of the adjustment applies without any reasonable efforts defence.
- The treaty usually eliminates withholding on genuine service fees where the parent has no Canadian permanent establishment, but that depends on the facts.
The 5% Rate Is Not Automatic
The treaty rate requires the parent to be the beneficial owner, to hold at least 10% of the voting stock, and to be a qualifying person under the limitation on benefits article. Form NR301 must be on file at the time of payment.
Without the declaration, the subsidiary should withhold the full 25%. That is a $147,000 difference on the same $800,000 of profit, recoverable only by the parent claiming a refund from the CRA afterwards.
What This Structure Still Gets Right
- Limited liability separating the Canadian operation from the US group.
- No branch profits tax, which a Canadian branch of the US corporation would face.
- A clean entity for Canadian contracts, employment and banking.
- Deferral, since the withholding applies only on distribution.
- Access to Canadian credits, including scientific research and experimental development, though at the non-CCPC non-refundable rate.
A Correction Worth Making
Form T1134 is often listed as a filing obligation for this structure. It is not. T1134 reports foreign affiliates of a Canadian corporation, so it applies where your Canadian subsidiary itself owns foreign entities, not because it has a foreign parent.
What does apply is Form T106, required where reportable transactions with non-arm’s length non-residents exceed $1,000,000 in the year, which most subsidiaries of this kind will cross.
What This Calculator Does Not Cover
- The United States treatment of the subsidiary’s income, which needs US advice
- Provinces other than Ontario, which have different general rates
- Whether a branch would be better than a subsidiary in your circumstances
- Determining arm’s length transfer prices, which is the substance of a study
- Scientific research credits at the non-CCPC rate
- Provincial payroll and sales tax obligations
Model the all-in rate before approving the structure, not after the first dividend. Our cross-border planning service covers the structure, the transfer pricing documentation and the withholding compliance.
Frequently Asked Questions
Common questions from US groups operating in Canada.
Related Calculators and Guides
More tools for cross-border groups.
Model the All-In Rate Before You Approve the Structure
Send us the projected Canadian income and the funding plan. We will confirm the effective rate, set the debt-to-equity within the limit, prepare the transfer pricing documentation and handle the withholding compliance.