Case note

Acquisition debt, and the difference between two tests

Mylan Australia Holding Pty Ltd v Commissioner of Taxation (No 2) (2024) 118 ATR 460; [2024] FCA 253

An Australian acquisition vehicle was funded three to one with intra-group debt. The Commissioner began with the transfer pricing provisions, abandoned them before trial, and ran the general anti-avoidance rule instead. The case is the clearest illustration that the two ask different questions.

Court

Federal Court of Australia

Bench

Button J

Decided

20 March 2024

Outcome

Taxpayer successful. The assessments were held to be excessive or otherwise incorrect

The facts

In 2007 the Mylan group, a United States generics business, agreed to buy the global generics business of Merck KGaA for about EUR 4.9 billion, a transaction the reasons describe as a USD 7 billion one: [52], [64], [4]. The scale is part of the story: the target's 2006 revenue exceeded the buyer's entire revenue for the year to March 2007, and group gearing was expected to rise from about 50 per cent to at least 81 per cent on completion: [434], [435].

The Australian part of the target was Alphapharm, then the leading generic pharmaceuticals business in Australia: [49], [50].

Two Australian companies were incorporated to take it. One was the acquisition vehicle, the other its immediate parent and the taxpayer in the proceedings, and they formed a consolidated group which Alphapharm joined on acquisition: [164] to [166], [42].

The acquisition vehicle was funded with a mix of interest-bearing debt and equity in a ratio of three to one, the debt being a promissory note issued to a Luxembourg group company: [4]. The interest deductions on that note are what the Commissioner attacked.

What was in dispute

Part IVA asks two questions in sequence. Did the taxpayer obtain a tax benefit, measured against what would or might reasonably be expected to have happened otherwise, which is called the counterfactual? And if so, was the dominant purpose of the arrangement to obtain it?

The Commissioner's case was that the Australian acquisition could have been funded with less debt and more equity, so that the interest deductions represented a tax benefit obtained for a dominant purpose.

What the Court decided

The taxpayer succeeded and the assessments were held to be excessive or otherwise incorrect: [604].

On the first question the outcome is more qualified than it is usually reported. No tax benefit arose on the Commissioner's own primary counterfactual: [301]. A benefit appeared to arise on a different counterfactual the Court itself constructed, and the Court put it no higher than that and never quantified it: [397].

The case was decided on the second question. Purpose is assessed objectively, and the threshold is high.

It must be recalled that merely obtaining a tax benefit does not satisfy s 177D: Guardian at [207] (Hespe J, Perry and Derrington JJ agreeing). Nor does selecting, from alternative transaction forms, one that has a lower tax cost of itself necessarily take the case within s 177D. It is, as the plurality explained in Spotless Services (at 416), only where the purpose of enabling the obtaining of a tax benefit is the "ruling, prevailing, or most influential purpose" that the requisite conclusion will be reached. In my assessment, MAHPL has established that, assessed objectively (and keeping in mind that the question is not what Mylan's actual, subjective purpose was), the facts of this case do not attract that conclusion.

Button J at [574]. The quoted words originate in Spotless Services at 416.

This is not a transfer pricing case. The dominant purpose enquiry need not, and should not, treat departures from the terms that may be seen between parties dealing at arm's length, or the absence of conduct of a kind that one would expect to see in connection with third party transactions (such as specific debt servicing capacity), as ipso facto demonstrating the requisite dominant purpose.

Button J at [475].

Why the decision matters

The second passage quoted above is why this decision belongs in a collection about transfer pricing even though it is not a transfer pricing case. It marks the boundary between the two regimes.

The same funding decision can be tested twice, on two different standards. The transfer pricing provisions ask whether the terms are those independent parties would have agreed, and they require no inquiry into purpose at all. The general anti-avoidance rule asks about purpose, objectively assessed, and requires that obtaining the tax benefit be the ruling, prevailing or most influential purpose. A group can fail the first and pass the second, and this case says clearly that failing the first does not of itself establish the second.

The procedural history makes the point more sharply than any reasoning could. The Commissioner brought both cases and abandoned the transfer pricing case before trial. A group facing questions about intra-group funding should expect the analysis to be run on both bases and should understand that the answers can differ.

The decision is also a caution about counterfactuals. The Commissioner's own primary counterfactual produced no tax benefit at all, which is a reminder that the second stage of the inquiry is never reached unless the first is made out on a counterfactual that is itself reasonable. Constructing that counterfactual is where a great deal of the work in these cases is done.

Where it stands

The decision appears to stand. The citator records no appellate history and only two citing decisions, both from 2026, both treating it as standing authority. The Australian Taxation Office issued a Decision Impact Statement in February 2025, revised in May 2025, which does not mention an appeal.

That is not the same as a statement that it was not appealed. A citator is not a court file, and no source read for this note says so in terms. Anyone who needs to rely on the point should check the court file.

This is a decision of a single judge at first instance, which limits its weight, and the reasoning on purpose is closely tied to the facts of a very large acquisition. Part IVA remains in force in the form construed.

A case note by Boettcher Law. It is general information about Australian law and a summary of a published decision, and it is not legal advice on any particular arrangement. Paragraph references are to the reasons of Button J.