Few questions in indirect taxation generate as much uncertainty as the VAT treatment of transfer pricing adjustments. Groups routinely agree provisional prices and true them up at year-end, yet the VAT consequences of that exercise have never been settled at EU level. Tax authorities have often been tempted to read those adjustments as payment for something.
On 13 May 2026, in Case C-603/24, Stellantis Portugal, the Court of Justice of the European Union directly addressed the question. The ruling comes only months after Arcomet Towercranes, which recognised that intra-group remuneration calculated under an OECD method could constitute consideration for a taxable supply of services. Read together, the two judgments mark the boundaries of the same field.
The message of Stellantis Portugal is one of conceptual discipline. A year-end price adjustment between related companies does not automatically become the price of a separate service. VAT does not follow profit; it follows consideration, and consideration exists only where a supply and a payment are linked by a direct connection within a reciprocal legal relationship.
The Facts Behind the Case
The taxpayer was the Portuguese national sales company of a large automotive group, formerly part of General Motors, then Opel Portugal, and ultimately absorbed by Stellantis Portugal. It purchased vehicles from the group's European manufacturers and resold them to independent dealers, who in turn sold them to end customers.
Where vehicles exhibited manufacturing defects, or where warranty work and roadside assistance were required, the dealers carried out the repairs and invoiced the distributor for the cost. The distributor then passed those amounts on to the manufacturers, together with its own operating costs.
Under an agreement concluded in 2004, the price of the vehicles was set provisionally and adjusted at the end of each financial year, upwards or downwards, to bring the distributor's actual margin back to a predetermined profit margin. The adjustment was implemented through credit or debit notes issued by the manufacturers, and repair costs were among the parameters used in the calculation.
Following an audit covering 2006, the Portuguese tax authority held that responsibility for the repairs lay with the manufacturers. In its view, the distributor had borne those costs, recovered them through the adjustment, and therefore supplied taxable repair services to the manufacturers. The taxpayer argued that the adjustment was simply a subsequent modification of the vehicles' purchase price.
The Question Referred
The Portuguese Supreme Administrative Court asked whether such a year-end correction falls within the concept of a supply of services for consideration. Because of the period at issue, the case was decided under the Sixth Directive, whose relevant provisions correspond to Articles 2 and 73 of the current VAT Directive.
The Court answered in the negative. An adjustment of this kind does not constitute consideration for a service unless the companies are bound by a legal relationship characterised by reciprocal obligations that can establish a direct link between the supply of those services and the adjustment itself.
The formulation matters. The Court did not exclude the possibility that transfer pricing adjustments could ever be relevant to VAT. It required that the ordinary conditions of taxability be verified on their own terms, rather than inferred from the existence of a transfer pricing policy.
Two Systems, Two Logics
The reasoning becomes clearer once the structural difference between the two regimes is recognised. VAT taxes supplies of goods and services made for consideration, and its taxable amount is the value the supplier actually receives or is to receive in return. That value is subjective: it is the price the parties agreed, not the price a market would have set.
Transfer pricing operates on the opposite logic. The arm's length principle requires that transactions between associated enterprises be valued as if they had been concluded between independent parties. The reference value is external, objective, reconstructed by comparison, and capable of yielding a range of defensible results.
EU VAT law permits open market value to replace the agreed consideration only within narrow anti-avoidance limits under Articles 72 and 80 of the VAT Directive. Treating market value as the general rule would invert the relationship between the principle and the exception.
The Court also noted a structural feature that weighs against the existence of a service. The adjustment operates in both directions and may result in a charge to either party. A service, by contrast, cannot carry negative consideration. That bidirectional character is itself an indication that the mechanism is not an autonomous supply.
The Arcomet Precedent and the Fear of Automatic Taxation
The practical significance of the question arises from Arcomet Towercranes, decided in September 2025. There, a Belgian parent company supplied commercial, organisational and management services to its Romanian subsidiary, assumed the principal business risks, and received an annual remuneration equal to the share of the operating margin exceeding a set threshold.
The Court found a direct link between the services and the amounts received. The parties were bound by a contract imposing specific obligations and reciprocal performance. The services conferred a concrete advantage on the subsidiary, and the remuneration, although variable, was fixed in advance according to precise criteria, and therefore neither random nor uncertain. On the deduction side, the Court accepted that authorities may require documentation beyond the invoice to prove that the services were actually performed and used for taxable transactions, provided the request remains necessary and proportionate.
Arcomet lent itself to an expansive reading, according to which the mere use of an OECD methodology, combined with an intra-group agreement, would be enough to create a taxable supply. Stellantis Portugal corrects that reading. What made Arcomet taxable was not the transfer pricing label; it was the presence of real services supplied under reciprocal obligations for a price.
Primary, Secondary and Compensating Adjustments
European practice has long organised the question around the classification set out in the OECD Guidelines and adopted in VAT Committee Working Paper No. 923. Primary and secondary adjustments restate the profits of group companies for income tax purposes. They typically follow an assessment, occur after the return has been filed, and involve neither an actual movement of funds nor an analytical link to identified transactions. They remain outside the scope of VAT.
Compensating adjustments are different. Parties make them voluntarily, before filing, to align prices with arm's length values from the outset. Only these can become VAT-relevant, and only under strict conditions: the adjustment must be directly linked to actual and identifiable supplies, it must result in a genuine transfer of money or consideration in kind rather than a bookkeeping entry, and it must qualify as consideration within the meaning of Article 73.
The VAT Committee has set out further expectations for such adjustments to be relied upon: reasonable efforts to align transactions with market value, documentation using the usual transfer pricing instruments, an adjustment made before the return and applied consistently over time, and corresponding accounting changes in both States involved.
Measured against this grid, Arcomet exhibited the features of taxable consideration: a contractual arrangement agreed in advance, real services, and an actual transfer of funds. In Stellantis Portugal, the reciprocal relationship between the supply and the adjustment was missing.
How the CJEU Reasoned
The judgment rests on two converging findings. First, the only legal relationship between the distributor and the manufacturers was the 2004 agreement, which set transfer prices and guaranteed a margin. No clause imposed on the distributor an obligation to repair vehicles, for a price, on behalf of the manufacturers. Without such an obligation, the adjustment cannot constitute remuneration for a service.
Second, and in the alternative, any connection between repair activity and the adjustment would be at most indirect. Repair costs were only one of the calculation parameters, alongside the distributor's own operating costs. The adjustment could result in either a credit or a debit note. Those costs were taken into account solely to secure the predetermined margin, with no guarantee of reimbursement.
The Court then stopped. Having excluded the characterisation as consideration for a service, it did not hold that the adjustment necessarily modifies the taxable amount of the original vehicle sales. It left that assessment to the national court and the competent authorities, by reference to the directive's taxable amount provisions.
That restraint is significant, and it marks a distance from the Advocate General's Opinion, which had been more inclined to treat the mechanism as a correction of the consideration.
The Italian Perspective
In Italy, transfer pricing is firmly within income taxation, under Article 110(7) of the Income Tax Code, which requires cross-border intra-group transactions to be valued according to the conditions and prices agreed between independent parties in comparable circumstances. The Supreme Court has held that the provision is not anti-avoidance in the strict sense, treating it instead as a response to the shifting of taxable income between jurisdictions.
Purely domestic transfer pricing falls outside that regime, under an authentic interpretation provision enacted in 2015. Commentators have warned that the general normal-value rule cannot serve as a substitute, since it is a narrow provision designed to translate income in kind into monetary terms, not a general power to review the adequacy of contractual prices.
Case law has also developed an allocation of the burden of proof that requires the administration to show that a transaction took place at an apparently below-market price, leaving the taxpayer to demonstrate conformity with market values or to explain the reasons for any divergence. That approach has drawn criticism, particularly since Italy's 2022 reform of evidence in tax litigation, on the ground that many intra-group transactions have no reference market and that the exercise concerns the reasonableness of cost allocation rather than a concealed fact.
What matters here is the structure of that regime. In income taxation, transfer pricing is based on an objective market value reconstructed through valuation. That is precisely the logic the Court of Justice refuses to apply to VAT, where subjective considerations prevail. An adjustment that restores arm's length margins for income tax purposes does not, for that reason alone, create a taxable transaction.
The outcome aligns with the position already taken by the Italian Supreme Court, which excluded the VAT relevance of transfer pricing adjustments because the two systems determine consideration using different criteria, and with the administrative practice that followed.
What This Means in Practice
The operative criterion emerging from the judgment is that characterisation for VAT purposes depends neither on documentary form nor on the adoption of an OECD methodology, but on the transaction’s economic and commercial reality. Groups therefore need to isolate the activities actually performed and the costs attributable to them, and avoid adjustments that merge heterogeneous components into a single, undifferentiated balancing figure.
Where no autonomous supply exists, the adjustment may still serve as a correction to the taxable amount, implemented in Italy through credit and debit notes under the VAT decree. That approach works best where the variation is contemplated from the outset and is anchored to objective parameters, including transfer pricing parameters. In the automotive fact pattern, the exercise is demanding because warranty costs do not reflect the characteristics of individual vehicles, depend on internal group factors, and may relate to earlier periods.
Where the adjustment is VAT-relevant, formal obligations apply. Invoicing must establish the analytical link between the remuneration and the intra-group services, which requires supplementing transfer pricing documentation with an analysis of the reciprocal relationship. The deduction carries its own evidentiary burden: proof that the services were actually performed and used for taxable transactions, with authorities entitled to request proportionate supporting documentation beyond the invoice.
The penalty dimension should not be underestimated. Given the scale of typical intra-group flows, a mischaracterised adjustment can create administrative and criminal exposure if it results in underpayment or in an improperly exercised right of deduction.
Conclusion
Stellantis Portugal does not create a VAT charge on transfer pricing, nor does it immunise transfer pricing from VAT. It returns the question to the categories of the tax itself. VAT follows consideration, not profit, and intra-group adjustments become relevant only where they affect identifiable transactions that have actually been carried out.
For groups, the consequence is the application of drafting discipline. The design of intra-group agreements, the characterisation of prices as provisional or final, the anchoring of adjustments to identifiable transactions, and the consistency between transfer pricing documentation and VAT treatment all become primary risk controls.
Read alongside Arcomet and in correction of its more expansive interpretations, the judgment reaffirms the autonomy of VAT from direct tax reasoning. That reaffirmation is its most valuable contribution to the European debate.
