Portugal’s Galp files for arbitration in tax dispute with Mozambique, ICSID website shows

Portuguese energy giant Galp Energia, S.A. has initiated an arbitration proceeding against the Republic of Mozambique before the International Centre for Settlement of Investment Disputes (ICSID). Registered on June 26, 2026, the dispute stems from a tax disagreement concerning Galp's 2024 sale of its 10% stake in the offshore Area 4 Rovuma Basin project to XRG. This development highlights the increasing scrutiny of capital gains from significant asset divestments in Mozambique's burgeoning extractive sector and underscores the critical role of bilateral investment treaties in protecting foreign investments. The case will likely test the interpretation of Mozambique's fiscal regime for petroleum operations and the protections afforded under the Portugal-Mozambique Bilateral Investment Treaty, setting a precedent for future investor-state relations in the country.

This arbitration underscores the inherent complexities and potential flashpoints in the fiscal regimes governing large-scale extractive projects in developing economies. For legal practitioners advising multinational corporations operating in Mozambique, the Galp case serves as a crucial reminder of the importance of robust investment agreements, clear tax planning, and a thorough understanding of the interplay between domestic tax laws and international investment treaties. The outcome of this dispute will not only determine the tax liability in question but will also provide valuable insights into Mozambique's commitment to investment protection and the predictability of its legal and fiscal environment.

Investor-state disputes in Mozambique are often adjudicated under the framework of Bilateral Investment Treaties (BITs) and the Convention on the Settlement of Investment Disputes between States and Nationals of Other States (ICSID Convention), to which Mozambique is a signatory. In this instance, Galp has invoked the Agreement on Mutual Promotion and Protection of Investments between the Portuguese Republic and the Republic of Mozambique, signed on 18 April 2005. This treaty provides substantive protections for Portuguese investors in Mozambique, including provisions on fair and equitable treatment, protection from expropriation, and access to international arbitration for dispute resolution. Such treaties are designed to provide a layer of legal certainty and recourse for foreign investors against adverse state actions, including those related to taxation.

Precedents from other investor-state disputes involving capital gains tax in the extractive sector, both in Africa and globally, may be referenced by both parties. Such cases often highlight the tension between a state's need to maximise revenue from its natural resources and an investor's expectation of a stable and predictable fiscal environment. The tribunal's decision will require a careful balancing act, considering the specific facts of the transaction, the contractual arrangements, the relevant Mozambican legislation, and the provisions of the Portugal-Mozambique BIT. Any ambiguities or contradictions within Mozambique's legal framework regarding the taxation of indirect transfers of interests or the valuation methodologies for capital gains could also become significant points of contention.

The outcome of Galp Energia, S.A. v. Republic of Mozambique will be closely watched by the international investment community. A ruling in favour of Galp could reinforce the protective power of BITs and potentially influence Mozambique's approach to taxing foreign investors, while a decision favouring Mozambique might embolden states to assert greater fiscal sovereignty over natural resource wealth. Practitioners should monitor the ICSID proceedings for developments, as the tribunal's reasoning could provide critical guidance on the interpretation of investment treaty standards and the application of capital gains tax in the context of large-scale energy projects in Africa.