Portugal: Portugal Proposes Its Windfall Tax Model as EU Blueprint for Oil Majors

On 18 September 2026, the Portuguese Government formally recommended that the European Commission use Portugal’s extraordinary contribution on the petroleum sector (CESEP) as the basis for a future EU-wide windfall tax on fossil fuel companies. The Portuguese model, enacted in 2023, levies a 33% rate on profits exceeding 20% of the average taxable income from the previous four years. The proposal aims to harmonize taxation of energy windfalls across the bloc, avoiding fragmentation and ensuring fair competition.

Key Takeaways

  • Model Design: The CESEP applies to upstream and refining activities, with a high threshold to avoid penalizing normal profitability.
  • EU Harmonization: Adoption would create a level playing field, preventing tax arbitrage and ensuring all major oil operators contribute similarly.
  • Revenue Allocation: Portugal suggests earmarking proceeds for the EU’s Social Climate Fund and REPowerEU initiatives.

Disclaimer: This article is compiled and summarized by the AI based on publicly available information and is for general information purposes only. It does not constitute any form of formal tax advice, legal opinion, or basis for performance. Please consult a qualified professional tax advisor or legal counsel for tax advice.

Source: Read Official Announcement