A European group that funds its Canadian subsidiary with a shareholder loan is doing something entirely ordinary. Debt is cheaper to service than equity, simpler to repay than share capital, and the interest reduces the Canadian tax base while a dividend does not. Canada legislated against the extreme version of it long ago. What surprises European finance directors is not that a limit exists. It is how mechanical the limit is, and how little the commercial logic of the loan matters once the ratio has been crossed.
The rule sits in subsection 18(4) of the Income Tax Act. It denies the deduction of interest on the part of intragroup debt that exceeds a fixed multiple of the borrower’s equity, and subsection 214(16) then converts the denied interest into a deemed dividend for withholding purposes. Two consequences follow from a single calculation: a larger Canadian tax base, and a withholding tax computed under a different article of the treaty from the one the group had in mind when it signed the loan.
What the ratio actually measures
Subsection 18(4) fixes the limit at 1.5 times the equity amount of the corporation or trust for the year. Interest is denied on the proportion of the debt that sits above that line, so the rule is proportionate rather than a cliff edge. A borrower at twice its equity amount loses part of its deduction, not all of it. A modest breach costs little in any single year and accumulates across several.
The debt measurement is monthly. The statute takes the greatest total amount of outstanding debts to specified non-residents at any time in each calendar month that ends in the year, and averages those monthly peaks. Equity is not: contributed surplus and paid-up capital are averaged month by month, retained earnings taken once at the start of the year. The design defeats year end housekeeping on the debt side. A loan drawn in February and repaid on the last working day of December counts for eleven months, and a facility repaid and redrawn inside one month counts at its peak.
Revolving intragroup funding therefore has to be monitored during the year rather than reconstructed after it, and groups running a cash pool through a European treasury company are the most exposed.
Who counts as a specified non-resident shareholder
The debt caught by the rule is not simply debt owed to the parent. Subsection 18(5) defines a specified shareholder as a person who owns shares carrying 25 per cent or more of the votes, or shares with a fair market value of 25 per cent or more of all the shares, counted together with shares held by persons with whom that person does not deal at arm’s length. A specified non-resident shareholder is such a shareholder who is a non-resident person or a non-resident-owned investment corporation.
The same subsection extends the perimeter. Outstanding debts to specified non-residents include debts owed to a non-resident who does not deal at arm’s length with a specified shareholder, whether or not that lender owns a single share. A loan from a Dutch sister company that holds nothing in the Canadian entity is caught, because it does not deal at arm’s length with the common parent.
Note also that 25 per cent is not control. A minority co-investor holding 30 per cent is a specified shareholder, and its funding line sits inside the calculation on the same footing as the majority’s. In one mandate the ratio had been tested against the parent loan alone, a co-investor facility of comparable size having been filed as third party debt. The exercise is to map every lender against the share register, with non-arm’s length holdings attributed, before any debt is classified.
The equity amount is not the balance sheet
The denominator is a tax construct. The equity amount defined in subsection 18(5) is built from retained earnings, contributed surplus contributed by specified non-resident shareholders, and the paid-up capital of shares held by specified non-resident shareholders. Paid-up capital is a statutory measure, not the equity figure in the IFRS accounts. Share premium recorded on consolidation, revaluation reserves and recognized goodwill do nothing for the ratio. Groups that assume otherwise overstate the denominator.
Retained earnings enter that total as they stand at the beginning of the year, and this is where the rule does its most awkward work. A Canadian subsidiary in its build phase carries accumulated losses, has little paid-up capital because the group preferred to fund by loan, and therefore has a small or nil equity amount. Almost the whole of its interest is denied in the years when it has no profit to shelter and no cash to pay a dividend.
Where the non-resident carries on business in Canada directly rather than through a subsidiary, the equity amount is computed differently: 40 per cent of the amount by which the cost of property used in the Canadian business exceeds the related Canadian debts. A branch and a subsidiary are therefore not interchangeable here.
Denied interest becomes a dividend
Subsection 214(16) deems the denied amount to have been paid as a dividend and not to have been paid as interest. The characterization changes for withholding purposes only, and it changes automatically. Part XIII imposes tax at 25 per cent on dividends paid by a corporation resident in Canada to a non-resident under subsection 212(2), and the convention with the Netherlands reduces that to 5 per cent of the gross amount where the beneficial owner is a company, not a partnership, that owns at least 25 per cent of the capital of the payer or controls directly or indirectly at least 10 per cent of its voting power, and to 15 per cent in all other cases. The same convention caps Canadian tax on interest at 10 per cent, the 1993 protocol having replaced the earlier 15 per cent.
The reduced dividend rate now carries a condition the bilateral text does not contain. Both states notified that provision under Article 8 of the multilateral instrument, so for amounts paid since 1 January 2020 the synthesised text of the convention allows 5 per cent only where the ownership condition is met throughout a 365 day period that includes the day of payment. A principal purposes test from the same instrument can deny any benefit the convention would otherwise give.
The result is counter-intuitive. Where the Dutch lender is also the qualifying shareholder, recharacterization can reduce the Canadian withholding rate from 10 per cent to 5 per cent. The saving is illusory: the deduction has been lost at the Canadian corporate rate, which is a multiple of the withholding differential.
The mismatch also travels. An amount treated as interest at the recipient level and as a dividend at source can fall between the participation exemption and the credit method rather than into either, and relief assumed at the Dutch end should be tested against the Dutch characterization.
Back-to-back arrangements and the guarantee problem
Subsections 18(6) and 18(6.1) close the obvious route around the ratio, which is to insert an unrelated lender. Where an intermediary lends to the Canadian borrower and has been granted a specified right over property by the specified non-resident, or where the intermediary itself owes a debt to that non-resident, the Canadian debt is treated as owing to the specified non-resident to the corresponding extent. The look through is proportionate, and the threshold in paragraph 18(6)(d) engages it only where that debt or the property subject to the specified right reaches 25 per cent of the borrowing from the intermediary.
The arrangement that trips this is unremarkable commercially. The Canadian company borrows from a local bank because local funding is convenient, and the European holding company supports the facility with a cash deposit, a pledge of a securities account, or a charge over an asset the bank can reach. From the group’s perspective this is credit support. From the perspective of subsection 18(6) it may be the grant of a specified right, and the bank facility is then re-read as parent debt inside the ratio.
A bare guarantee sits differently, and its treatment turns on the security package rather than the label. What matters is whether the lender has rights over identified property, which is a question for the facility documents. The ratio has to be tested against the economics of the funding chain, not the counterparties named on the loan schedule.
Thin capitalization is now the second test
Since the arrival of the excessive interest and financing expenses limitation in section 18.2, the ratio is no longer the only constraint. The EIFEL rules cap net interest and financing expenses at a ratio of permissible expenses applied to adjusted taxable income. That ratio is 30 per cent for taxation years beginning on or after 1 January 2024, and 40 per cent for taxation years beginning on or after 1 October 2023 and before that date. A group with audited consolidated statements can elect the group ratio in section 18.21 instead.
A Canadian subsidiary of a European group will usually reach only one branch of the excluded entity definition. The Canadian-controlled private corporation branch, which requires taxable capital employed in Canada below CAD 50,000,000, is unavailable to a foreign owned company, and the domestic operations branch requires activities carried on in Canada, no non-resident specified shareholder, and foreign affiliate holdings not exceeding CAD 5,000,000. What remains is the de minimis: aggregate net interest and financing expenses of the taxpayer and its eligible group entities of CAD 1,000,000 or less.
The two rules apply in sequence. Subsection 18(4) removes the excess intragroup interest first, and the EIFEL calculation then operates on what survives, including third party interest that the thin capitalization rule never touched. The denial under 18(4) is permanent. Amounts restricted under the EIFEL rules can be carried forward without a time limit, and unused room runs the other way: cumulative unused excess capacity is built from the current year and the three immediately preceding taxation years, so headroom created in a lean year lasts three years and no longer.
Pricing the debt before counting it
Thin capitalization limits quantum. It says nothing about rate, term, currency or covenants, and a loan comfortably inside the ratio can still lose its interest deduction under the transfer pricing rule in subsections 247(2) and 247(2.02) if the terms are not those arm’s length parties would have agreed. The two tests are cumulative.
Pricing an intragroup loan into Canada means establishing the borrower’s standalone credit position, adjusted for the support it derives from group membership, and evidencing a rate consistent with that position. A rate copied from the parent’s own funding cost is not that. Nor is a rate set at the ceiling the treaty permits, which is a withholding cap and not a pricing benchmark. Contemporaneous documentation has to exist by the filing due date.
Sequence matters. Price the loan first, then test the ratio: repricing reduces the interest expense without reducing the principal, and subsection 18(4) works off the principal.
Designing the capital structure at the outset
The ratio is a design parameter, and the cheapest moment to respect it is before the first drawdown. Capitalizing the entity with paid-up capital sufficient to support the intended debt costs nothing in tax terms and creates the denominator the group will need in year three. Doing it later, after the accumulated deficit has consumed the equity amount, is a restructuring rather than a subscription.
Repatriation should be planned at the same time. A return of paid-up capital is a different mechanism from a dividend and carries its own anti-avoidance perimeter. The relationship between what goes in at the start and the routes available later is what keeps a structure defensible. Groups that fund entirely by loan because a loan looks reversible find that the reversal is the part the rules were written to catch.
None of this requires a view on how aggressive the group wishes to be. Subsection 18(4) is arithmetic, the inputs sit in the company’s own ledgers, and the answer is the same whoever performs the calculation. The file either respects the ratio or it records, month by month, the extent to which it does not.
This article is informational and does not constitute tax or legal advice. The treatment of any structure depends on its facts and on the law of each jurisdiction involved. Each engagement is subject to scope and applicable regulation.