Anonymised, illustrative composite. Nothing about the debt changed. What changed was that the third bolt-on pushed the group's taxable capital past a threshold, and a limitation the model had never carried denied 28.5% of the interest deduction.
At a glance
A Canadian buy-and-build platform in industrial services had made three acquisitions in a little over two years, funded with a senior facility at the platform and a mezzanine tranche for the third deal. The model behind the third acquisition price deducted every dollar of interest, as the first two had, and the group's tax provision had never carried a limitation line. Nothing about the debt changed in the year the limitation applied — the group's size and the composition of its equity did.
The excessive interest and financing expenses limitation does not apply to every taxpayer. It applies to a taxpayer that is not an excluded entity for the year, and excluded-entity status is tested annually and at group level. A group can therefore be outside the rules for two years and inside them in the third without renegotiating a single credit agreement — which is what happened here.
Two things moved. The third acquisition took the associated group's taxable capital employed in Canada past $50,000,000, and a co-investor resident outside Canada, brought into the equity for the third deal, took 26% of the platform. Each of those closes a different branch of the excluded-entity definition, and the definition is disjunctive: the group needed only one branch and now had none.
For the year in question: interest and financing expenses of $3,400,000; adjusted taxable income of $7,600,000; interest and financing revenues of $150,000; no received or absorbed capacity.
The permissible amount is the ratio of permissible expenses multiplied by adjusted taxable income — 30% of $7,600,000, or $2,280,000. Adding the $150,000 of interest and financing revenues gives $2,430,000. The denied proportion is therefore ($3,400,000 − $2,430,000) ÷ $3,400,000 = 28.53%, applied to the amounts otherwise deductible, denying $970,000 of the $3,400,000.
On the excluded-entity tests, the group's net figure — interest and financing expenses of $3,400,000 less interest and financing revenues of $150,000, aggregated across the Canadian group — was $3,250,000, against a threshold of $1,000,000.
ITA s.18.2(2) carries the marginal note Excessive interest and financing expenses limitation. It opens “Notwithstanding any other provision of this Act” and provides that in computing the income of a taxpayer “(other than an excluded entity for the year)” from a business or property, or its taxable income, no deduction shall be made in respect of interest and financing expenses that would otherwise be deductible “to the extent of the proportion of that amount that is determined by the formula (A − (B + C + D + E)) ÷ F”.
The unit is a proportion of the taxpayer's interest and financing expenses, not a cap on a loan. Nothing is disallowed because a particular facility is too large. A percentage is computed from group-level and entity-level inputs and applied to the expenses that would otherwise be deducted. Two consequences follow that a covenant-style reading misses: the denial moves with earnings, so a bad year worsens it; and interest and financing revenues (the letter C) reduce it, so intercompany interest income is not neutral.
B, in the ordinary case, is the ratio of permissible expenses multiplied by adjusted taxable income. The ratio is defined in s.18.2(1): for a taxation year beginning on or after October 1, 2023 and before January 1, 2024 it is 40%, and “if the taxpayer's taxation year begins on or after January 1, 2024” it is 30%. It is a percentage of earnings, not of debt, which is why a leverage model built on a debt-to-EBITDA covenant does not capture it.
Everything therefore turns on excluded-entity status, defined in s.18.2(1) in three disjunctive branches. Branch (a) covers “a corporation that is throughout the particular year a Canadian-controlled private corporation in respect of which the amount determined for C in paragraph 125(5.1)(a) for the year is less than $50,000,000” — and that amount is, per s.125(5.1)(a), taxable capital employed in Canada, aggregated across associated corporations. Branch (b) is a de minimis: it applies where “$1,000,000 is not less than” the group's net interest and financing expenses, computed across the taxpayer and its Canadian eligible group entities.
Branch (c) is the all-Canadian branch, and it is the one the co-investor closed. It requires, among other conditions, that all or substantially all of the businesses and activities of the taxpayer and each eligible group entity be carried on in Canada, a foreign-affiliate exposure of not more than $5,000,000, and — at subparagraph (c)(iii) — that no person or partnership is at any time in the year “a specified shareholder or a specified beneficiary (as those terms are defined in subsection 18(5)) of the taxpayer, or of any eligible group entity in respect of the taxpayer, that is not resident in Canada”. A specified shareholder under s.18(5) is a holder of 25% or more of the votes, or of shares with 25% or more of the fair market value. A 26% non-resident co-investor is one, and its presence is tested at group level: it disqualifies every entity in the group, not just the one it holds shares in.
Nothing could be done inside the year. The $970,000 was denied. Section 18.2(2)'s own formula refers, in the description of D, to amounts “deductible under paragraph 111(1)(a.1) for the year”, which is the route by which restricted interest and financing expense is deducted in another year — so the amount is not necessarily lost permanently, though realising it depends on later capacity that this file does not model.
Prospectively the group did two things. It restructured the co-investor's holding below the 25% specified-shareholder threshold, which restores branch (c) if the other conditions hold. And it rebuilt the acquisition model to run the limitation as a line item off adjusted taxable income, so that the fourth acquisition was priced on after-limitation cash flow.
The damage was already done at the pricing stage rather than at the filing. A model that deducts $3,400,000 of interest when $970,000 will be denied overstates after-tax free cash flow, and an acquisition price built on that overstatement is too high by the capitalised value of the error. The limitation was not a tax-return surprise; it was a valuation error discovered late.
The tell was in the capitalisation table, not the credit agreement. The equity stack changed and the debt did not, and the rule is triggered by the equity stack. Any group whose taxable capital is approaching $50,000,000, whose net interest cost is approaching $1,000,000, or that is about to admit a non-resident holder near 25%, is one transaction away from a limitation that no covenant measures.
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