The Portuguese Stamp Duty framework for cash pooling
Cash pooling is a treasury management mechanism commonly used by corporate groups to optimise liquidity by concentrating surplus funds from participating companies and making those resources available within the group.
One frequently used arrangement is known as zero balancing, under which balances held in participating companies’ bank accounts are periodically transferred to a central account, enabling the group to manage its financial resources on a consolidated basis.
From a Portuguese tax perspective, such transfers may qualify as credit transactions falling within item 17.1 of the General Stamp Duty Table (TGIS).
However, the application of Portuguese Stamp Duty does not depend solely on whether a transaction qualifies as financing. It is also necessary to determine whether the transaction has a sufficient territorial connection with Portugal under Article 4 of the Portuguese Stamp Duty Code.
The identification of that territorial connection has been a recurring source of disagreement between taxpayers and the Portuguese Tax and Customs Authority.
The CAAD ruling: where the funds are used is decisive
In case No. 1129/2025-T, decided on 3 September 2026, the dispute concerned transfers of surplus liquidity from a Portuguese financial company to a group treasury entity resident in Germany.
Under a zero-balancing cash pooling agreement, the Portuguese company’s surplus funds were transferred daily to a bank account held by the German treasury entity in Frankfurt.
The Portuguese company had self-assessed Stamp Duty on these transactions for the period from April to December 2020, paying a total of EUR 47,731.51.
It subsequently challenged those self-assessments, arguing that the funds had been received and used by the German entity outside Portuguese territory.
The Portuguese Tax Authority maintained that the location of the lender in Portugal was sufficient to establish the territorial connection required for taxation.
The Arbitral Tribunal upheld the Portuguese company’s position.
It concluded that, for the purposes of item 17.1.4 of the General Stamp Duty Table, the relevant territorial connection should be determined by reference to the place where the funds are effectively used, rather than merely the location of the entity granting the credit.
According to the Tribunal, in dematerialised financial transactions, credit is used when the funds are received and placed at the disposal of the beneficiary.
Since the funds had been transferred to a bank account in Germany, where they became available to the group treasury entity, the Tribunal concluded that the transactions fell outside the territorial scope of Portuguese Stamp Duty.
Accordingly, the contested self-assessments were annulled and the Portuguese Tax Authority was ordered to refund EUR 47,731.51, together with compensatory interest calculated in accordance with the terms of the ruling.
An issue that remains unsettled in Portuguese case law
The significance of this decision extends beyond the individual dispute, as the Portuguese courts and tax arbitration tribunals have adopted different approaches to the taxation of cross-border cash pooling arrangements.
The central question is whether the relevant territorial connecting factor is the place where credit is granted or the place where it is effectively used.
In the present case, the Arbitral Tribunal considered that the lender’s residence in Portugal does not, by itself, establish a sufficient basis for imposing Portuguese Stamp Duty.
This approach is consistent with a line of arbitral decisions emphasising the actual availability of funds to the beneficiary, including cases Nos. 280/2020-T, 44/2024-T and 1018/2024-T.
Nevertheless, other decisions have attached greater importance to the location of the lender, meaning that the legal position cannot be regarded as definitively settled.
In particular, in its judgment of 22 March 2023, in case No. 0155/21.0BALSB, the Portuguese Supreme Administrative Court did not resolve the conflicting interpretations, having found that the decisions under consideration did not concern the same fundamental question of law.
The latest CAAD ruling therefore represents an important development, but its application remains dependent on the contractual terms and financial circumstances of each arrangement.
Practical implications for multinational groups
The ruling is particularly relevant for multinational groups operating international cash pooling structures in which Portuguese companies transfer surplus funds to treasury centres located in other jurisdictions.
In such circumstances, identifying where the funds are effectively made available to the beneficiary may be decisive in determining whether Portuguese Stamp Duty is due.
Companies should therefore examine their cash pooling agreements, the ownership and location of the relevant bank accounts, the actual movement of funds and the conditions under which the treasury entity obtains control over those funds.
The decision may also provide grounds for reviewing the historical Stamp Duty treatment of comparable transactions and assessing whether any tax previously paid could potentially be recovered.
Any refund claim would, however, remain subject to the specific circumstances of the transactions, the available procedural remedies and the applicable statutory deadlines.
It is also important to distinguish the territorial scope of Stamp Duty from the exemptions available under Article 7 of the Portuguese Stamp Duty Code. These are separate legal questions and must be assessed independently.
Belzuz Abogados, S.L.P.‘s experience in advising domestic and international clients, particularly corporate groups engaged in cross-border transactions, enables us to recognise the importance of a comprehensive tax assessment of intragroup financing and centralised treasury management arrangements. Such transactions require careful consideration not only of the applicable legal framework but also of their contractual structure, financial flows and developments in tax case law.
In this context, the Tax Law Department at Belzuz Abogados, S.L.P. brings together a team experienced in corporate and international taxation, providing clients with legal and tax advice on the treatment of cash pooling arrangements, the identification of potential tax exposures and the assessment of opportunities to recover unduly paid Portuguese Stamp Duty. Our team also assists clients in developing solutions aimed at ensuring greater legal and tax certainty in their international financing operations.
Final considerations
The CAAD decision of 3 September 2026 marks a further development in the interpretation of Portuguese Stamp Duty territoriality rules applicable to international cash pooling arrangements.
By focusing on the place where funds are effectively used rather than the location of the lender, the Tribunal reinforces an interpretation that may have significant implications for intragroup financing and international treasury management.
However, the existence of divergent case law calls for a cautious, case-by-case assessment.
Multinational groups participating in cross-border cash pooling arrangements should consider reviewing their Portuguese Stamp Duty position in light of this ruling, both to ensure appropriate treatment of future transactions and to identify potential opportunities to recover tax unduly paid in previous periods.