What are the tax steps for intercompany loans & thin capitalisation?

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Answer

Thin-capitalisation rules cap the deductible interest by reference to capital structure; transfer pricing tests the rate against comparable borrowings with similar security, term and currency. Each step forecloses or preserves an option in the next one, which is why the order is not cosmetic.

The steps, in order

Thin-capitalisation rules cap the deductible interest by reference to capital structure; transfer pricing tests the rate against comparable borrowings with similar security, term and currency. Failing either one leaves interest paid but not deducted.

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When it does not bind you

An intercompany loan is priced twice: once for how much debt the borrower could have carried, and once for what rate an independent lender would have charged.

What are the tax steps for intercompany loans & thin capitalisation?
ItemAmount
RevenueC$37,000,000
Operating margin reported4%
Operating profit reportedC$1,480,000
Assumed tested range4% – 6%
Profit at the bottom of the rangeC$1,480,000
Potential adjustmentC$0

The reported margin sits inside the tested range, which is the outcome documentation is meant to demonstrate. Keep the study current: a range computed three years ago is not evidence about this year.

The figures here are an illustration, not an engagement: amounts are picked so the mechanism is easy to follow, and every rate or threshold is an assumption of the example. Before anything is filed for you, each one is confirmed with the issuing authority for your own tax year.

Where to go from here

The full treatment — who it binds, the deadline, the penalty and the fixed fee — is on Intercompany loans & thin capitalisation. We will tell you if you do not need us. That happens more often than you would expect.

Reviewed for accuracy for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. Published as general information. For a position on your own file, call the 24-hour helpline.

International business tax law — what this page covers

This is the page to read on international business tax law. It takes intercompany loans & thin capitalisation in order — the test that decides who is affected, the returns and forms that follow from it, and a fee quoted in writing before anything starts.

Files that look like this one

Case study 1

Acquisition funded entirely by a loan from the parent

A group bought a business through a newly formed company capitalised with a token share issue and a shareholder loan covering the whole purchase price. We measured the debt against the equity contributed and set out how much interest would fall outside the deductible cap in each of the first years. The engagement produced a funding analysis, a schedule of deductible and non-deductible interest by period, and an equity injection plan sized to the outcome the group actually wanted, prepared before the first interest payment fell due.

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Case study 2

Rate copied from the parent's own bank facility

A borrower had adopted the margin its parent paid to an external bank, on the reasoning that a real lender had set it. We tested comparability on the points that matter: the security behind each borrowing, the term, the currency, and the financial standing of each borrower. The differences were substantial. The engagement produced a comparables analysis in the borrower's own currency, a supported rate with the reasoning recorded, and an amendment to the loan agreement aligning the documented terms with the borrowing that had actually been tested.

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Case study 3

Interest accrued but never paid across several periods

A subsidiary had booked interest to its parent for years without paying any of it, and the balance had compounded into the loan. We established what the arrangement had become, whether the accrued amounts remained within the deductible cap as the balance grew, and how the growing debt affected the ratio in later periods. The engagement produced a period-by-period computation of the deductible portion, a note on how accrual rather than payment altered the analysis, and a recommendation on settling or capitalising the accrued balance.

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Case study 4

Partial conversion of shareholder debt into equity

A group wanted to stop generating interest it could not deduct and asked what converting part of the loan would achieve. We modelled the ratio before and after, identified the measurement points that determine the cap, and set out from which period the improvement would take effect. The engagement produced a comparison of the two positions, the timing required for the conversion to affect the intended year, and the documentation needed to evidence the conversion itself, including what the remaining loan would still need by way of rate support.

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Case study 5

Loan denominated in a currency the borrower does not earn

A borrower servicing a parent loan in the parent's currency while earning in its own had priced the debt using comparables from the lender's market. We rebuilt the analysis around the borrowing as the borrower experienced it, selecting comparables in the borrower's currency and reflecting the exposure the arrangement created. The engagement produced a revised rate analysis, a written explanation of why the currency of the borrowing drives the comparable set, and a note on how the currency exposure should be recorded in the intercompany agreement.

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Case study 6

Assessment denying interest rebuilt year by year

An assessment denied a company's entire shareholder interest for several periods without distinguishing the grounds. We separated them, applying the capital structure cap first and the rate analysis to what survived, and reconstructed the equity position at each measurement point from the statutory accounts and the share register. The engagement produced a computation for each year showing the deductible portion, the evidence supporting the equity figures, and a written response that conceded the part which could not be defended and contested the part that rested on the record.

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Case study 7

A Shareholder Loan Across a Border at No Interest

An interest-free loan between related companies is priced as if it carried interest, and in some cases a deemed benefit follows as well. The file sets a rate against the borrower's own credit profile and documents the terms that support it.

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Case study 8

The Local File That Has to Match the Accounts

A local file describes the entity's own controlled transactions and ties them to its statutory figures. Where the two do not reconcile, that is what an examiner opens with.

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All case studies — every published engagement in one place.

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More on Intercompany loans & thin capitalisation

How much can my company borrow from its foreign parent?

Commercially, as much as the parent is willing to advance. For tax the question is a different one: how much of the interest on that debt the borrower can actually deduct. The cap is set by the capital structure, measuring what is owed to the specified shareholder against the equity contributed, and interest on the excess simply sits outside the deduction. Separately, transfer pricing asks whether an independent lender would have advanced that much to this borrower at all. The two questions overlap but they are not the same, and both are asked.

What interest rate should I charge on a loan between my companies?

The rate an independent lender would have charged this borrower for this loan. That means comparable borrowings, and comparable does real work in that sentence: similar security, similar term, similar currency, and a borrower of similar financial standing. A rate lifted from the parent's own bank facility usually fails on at least one of those, because the parent borrows on different security and often in a different currency. The analysis is about matching the circumstances of the borrowing, not finding a rate that looks reasonable in the abstract.

Why is our interest expense denied when we actually paid it?

Because payment and deduction are decided by different rules. The thin-capitalisation cap looks at the capital structure and denies the deduction for interest above the limit regardless of whether it was paid, accrued or reinvested. Transfer pricing can deny part of it again by finding the rate exceeded what an independent lender would have charged. So the first question after a denial is which of the two produced it, because the answer decides whether the remedy is a change of capital structure or a change of rate, and confusing them wastes a year.

Does a parent guarantee change the rate on an intercompany loan?

It changes what the borrowing actually is, so it changes the comparables. A loan supported by a parent guarantee is a different credit from the same loan without one, and the comparable borrowings you test against have to reflect that. Groups often want the benefit both ways, pricing as though the borrower stood alone while relying on group support in practice. The file should say plainly what support exists, what form it takes, and how the comparables were selected in light of it, because that choice is the part an examiner will look at first.

Can I refinance the intercompany loan to fix the problem?

Refinancing can change the structure going forward, and that is worth doing where the current arrangement produces interest that cannot be deducted year after year. It does not repair periods already closed, because the cap applied to those periods on the capital structure that existed then. Before refinancing, be clear which of the two tests was failing. If the problem was the amount of debt, a new agreement at a better rate changes nothing. If the problem was the rate, refinancing at a supported rate helps but leaves the structural cap exactly where it was.

Can a loan pass one test and still lose the deduction?

Yes, and that is the outcome groups are least prepared for. A modest, well-supported rate does nothing for a borrower whose debt sits far above what its equity will carry, because the cap applies to the quantum of interest however reasonable the rate is. Equally, a borrower with a conservative capital structure can still lose part of its deduction if the rate is above what comparable borrowings would bear. The tests are cumulative rather than alternative. Run both before the agreement is signed, because the structure is much harder to change once the money has moved.

Do I pay tax twice on a foreign dividend?

Not at full rates if the relief is claimed. The paying country usually withholds at source, capped by treaty where one applies and the paperwork is in place; your residence country then taxes the dividend and credits the foreign withholding against its own charge. Where the withholding exceeded the treaty rate because no declaration was filed, the excess is recovered from the paying country, not credited at home. See the dividends article.

Does a remote employee create a permanent establishment?

It can. One employee working from home in another country may be enough where the arrangement gives the company a fixed place at its disposal, or where that person habitually concludes contracts. Seniority and function matter more than headcount: a salesperson closing deals is a far greater risk than a developer. The exposure is corporate tax and payroll registration in that country, which is why it is worth testing before the hire rather than after. See PE risk review.

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