Candice Horbacz
The European Union and its Member States have repeatedly turned to windfall profit taxes on energy companies as a rapid response to soaring energy prices, first ignited by Russia’s invasion of Ukraine and more recently exacerbated by the conflict in the Middle East. These levies, designed to capture what are perceived as "unearned" or "supernormal" profits and channel them into consumer relief, have become a recurring feature of the European economic landscape. However, a closer examination reveals that these "temporary" measures often fall short of their revenue targets, introduce significant market distortions, and raise profound questions about their legality, economic efficacy, and long-term implications for energy security and the vital green transition.
The Genesis of Windfall Taxation: A Response to Crisis
The impetus for windfall taxes in Europe emerged from a confluence of unprecedented geopolitical and economic pressures. Following Russia’s full-scale invasion of Ukraine in February 2022, natural gas prices on benchmarks like the Dutch TTF hub surged by over 300% within months, while Brent crude oil prices briefly topped $130 a barrel. European households and industries faced crippling energy bills, triggering widespread public outcry and intense political pressure on governments to act. The war in the Middle East further compounded these anxieties in late 2023 and early 2024, rekindling concerns over supply disruptions in crucial shipping lanes and pushing oil and gas prices upwards once more. In this volatile environment, fossil fuel companies, benefiting from higher commodity prices, reported substantial profits, leading to accusations of profiteering and demands for these "windfalls" to be redirected to alleviate consumer burdens. Five EU Member States recently urged the European Commission to consider new windfall taxes linked to the Middle East conflict, highlighting the enduring political appeal of such measures despite past experiences.
Windfall taxes, by definition, are extraordinary, one-time levies imposed on companies or industries that experience unexpectedly large profits due to unforeseen economic conditions. Their stated purpose is to fund relief measures for consumers grappling with the very price spikes that generate these profits. Historically, such taxes have been implemented during periods of wartime or commodity booms, but their application often faces challenges in defining "windfall" and managing their economic repercussions, frequently leading to legal battles and market distortions.
The EU’s Initial Response: The "Solidarity Contribution" (2022-2023)
Recognizing the need for a coordinated European response, the European Commission, as early as March 8, 2022, in its REPowerEU communication, recommended that Member States temporarily impose windfall profit taxes across all energy providers. The Commission’s initial vision emphasized technological neutrality, non-retroactivity, and a design that would not unduly influence wholesale electricity prices or long-term market trends. This recommendation was driven by the urgent need to diversify energy supplies away from Russia and stabilize soaring energy costs across the continent.
This recommendation culminated on October 6, 2022, when the Council of the European Union formally agreed to implement an EU-wide windfall profits tax, officially termed the "solidarity contribution." This mechanism specifically targeted fossil fuel companies operating in the oil, gas, coal, and refining sectors, though its final design diverged from some of the Commission’s initial recommendations. The regulation mandated Member States to apply either this solidarity contribution or an equivalent national measure to surplus profits generated in fiscal years 2022 and/or 2023. Concurrently, a cap was introduced on market revenues for electricity generators utilizing infra-marginal technologies like renewables, nuclear, and lignite. The EU initially projected that these two policies combined would raise approximately €140 billion, with €25 billion expected specifically from the solidarity contribution on oil and gas companies. The revenue was earmarked to partially offset high energy bills for households, distributed through "non-selective and transparent" measures, such as direct payments, energy vouchers, or reduced VAT on energy.
The solidarity contribution defined "surplus profits" as those generated in 2022 and/or 2023 exceeding a 20 percent increase over the average profits from 2018-2021. These profits were then subject to a minimum tax rate of 33 percent. Companies falling within the scope of this tax were those generating at least 75 percent of their turnover from extraction, mining, refining of petroleum, or manufacturing of coke oven products. Alternatively, Member States had the flexibility to implement their own "equivalent national measure," leading to a patchwork of approaches across the bloc. By August 2024, 16 out of 27 Member States had applied the solidarity contribution, while eight others opted for equivalent national measures. Notably, three countries – Luxembourg, Latvia, and Malta – reported having no in-scope companies, indicating limited fossil fuel production within their borders. Among those with a windfall tax, seven – Belgium, Czech Republic, Hungary, Italy, Portugal, Spain, and Sweden – implemented their own national versions, often with bespoke designs. Outside the EU, the United Kingdom also introduced its own windfall profits tax. The rates, targeted sectors, and structures of these taxes varied significantly, ranging from 25 percent in the UK to an astonishing 75 percent in Ireland and 80 percent in Slovenia, underscoring the lack of true harmonization despite the EU’s coordinating effort.
Limited Returns and Persistent Challenges in Revenue Collection
Despite the ambitious projections, the actual revenue collected from the EU-wide solidarity contribution and equivalent national measures for fiscal years 2022 and 2023 amounted to €26.15 billion. While this figure marginally exceeded the initial €25 billion estimate specifically for oil and gas companies, it highlighted significant discrepancies and a broader failure to meet the overall energy support funding needs of €140 billion.
Several countries reported challenges or yielded minimal revenue. Beyond the three nations with no in-scope companies, Finland, Lithuania, and Sweden reported zero revenue from this policy to the European Commission, with no further public data available, raising questions about their implementation or the presence of qualifying companies. Cyprus never formally adopted the regulation. Croatia, which applied a broad windfall tax to all economic sectors, did not report specific revenues from this policy on energy companies, making it difficult to assess its impact within the energy sector. Consequently, revenue data is available for only 19 of the 27 EU Member States, painting an incomplete picture of its effectiveness.
Crucially, a European Commission report released in November 2023 revealed that the revenues from the solidarity contribution constituted a mere 7 percent of the total cost of energy support measures implemented by Member States, which collectively reached an astounding €340 billion. This stark contrast underscores the limited financial impact of these taxes in alleviating the overall burden on consumers. For instance, while France spent billions on energy shields and Germany allocated over €200 billion to its "double-whammy" energy relief package, the windfall tax contributions were relatively minor. Moreover, this calculation does not account for the potential loss of future revenue stemming from reduced investment that these policies might induce, which could have long-term negative fiscal implications.
"Temporary" Measures Become Enduring Policy
A core principle of the EU regulation was that windfall profit taxes should be a temporary mechanism, "limited and tied to a specific crisis situation." Yet, the reality has diverged sharply from this intent. Several countries have extended their application well beyond the initial timeframe, transforming crisis-era interventions into more permanent fiscal tools, reflecting persistent fiscal needs and ongoing geopolitical uncertainty.
Hungary, an early adopter, extended its windfall tax application to 2024. The Czech Republic and Spain pushed their deadlines to 2025. Outside the EU, the United Kingdom, which implemented its own windfall tax in 2022, has controversially extended its application until 2030. Italy, in February 2026, even introduced a surcharge on its regional tax on production activities (IRAP) for energy companies, slated to apply from 2026 to 2027, indicating a continued reliance on such measures.
The Czech Republic’s journey with windfall taxes exemplifies this policy creep. In December 2022, it introduced a 60 percent windfall profits tax for three years (2023-2025), expanding its scope to include the banking sector, a significant deviation from the EU’s energy-focused mandate. While the Czech finance minister initially announced plans to scrap the tax for 2025, a reversal occurred in August 2024. The minister cited that "the overall revenue from the special levy on the biggest energy companies and banks still hasn’t covered the state’s expenditure on mitigating the impact of Europe’s energy crisis," illustrating the persistent fiscal pressures driving these extensions and the difficulty in predicting revenue streams.
Spain’s experience further highlights the deviation from EU guidelines. While initially implementing a temporary mechanism in 2021 to tax excess revenues of energy companies, a series of exclusions eventually narrowed its scope. In December 2022, Spain adopted a new windfall profits tax on large operators in crude oil, natural gas, coal mining, and refining, but its design significantly differed from the EU-wide model. Spain utilized net turnover as the tax base, rather than taxable profits, applying a 1.2 percent rate to domestic power utilities’ sales. This approach meant the tax targeted sales volume rather than actual profitability, making it more akin to an excise tax. Furthermore, it applied only to companies with an annual turnover exceeding €1 billion in 2019 and was set for fiscal years 2023 and 2024. Despite initial vows by the Spanish government to align with the EU’s design, no amendments were made, and the tax was extended through 2024, ultimately being abolished at the end of that year. This deviation sparked legal challenges, with Spain’s largest electricity companies, including Iberdrola and Endesa, filing motions claiming the tax was "discriminatory and unjustified," arguing it taxed all domestic revenue rather than just "windfall" profits from natural gas.
The UK’s Energy Profits Levy, introduced in May 2022, also diverged significantly. It specifically targeted oil and gas extraction companies, applying an additional 25 percent rate (later increased to 35 percent and then 38 percent) on top of the existing 40 percent headline tax, resulting in a formidable combined tax rate of 78 percent. Initially set to expire in December 2025, it was extended to March 2028 and then to March 2030. The Chancellor’s recent decision to maintain the tax, reversing earlier plans for an early termination, underscored the influence of geopolitical events like the Iran conflict on fiscal policy and the ongoing need for revenue.
The Economic and Legal Downsides of Windfall Profits Taxes
While politically attractive, windfall profits taxes inherently violate core principles of sound tax policy: simplicity, neutrality, transparency, and stability. Their implementation has generated a host of economic and legal problems that often undermine their intended goals, creating an environment of uncertainty for businesses and hindering long-term economic planning.
Defining Supernormal Returns: A Complex Conundrum
The fundamental challenge lies in precisely defining "windfall profits" or "supernormal returns." These are typically understood as investment payoffs exceeding the typical market rate of return. However, the energy sector is notoriously volatile, exposed to significant market and geopolitical risks. For instance, while oil prices soared in 2022, they had plummeted significantly during the COVID-19 pandemic in 2020, even briefly turning negative for some futures contracts. Years of high profits, often driven by external shocks, frequently offset periods of heavy losses when energy prices plummet. What appears as a "windfall" in one year might merely be compensation for substantial risks taken over a longer cycle. Taxing such returns punitively can discourage future risk-taking, which is essential for innovation and supply expansion.
Many European "windfall taxes" have gone beyond merely taxing genuine windfalls. By defining the tax base as the difference between current profits and a baseline period’s average, they risk double-taxing regular profits rather than isolating true excess returns. This imprecision creates uncertainty for investors and can lead to unintended consequences. Italy, for instance, grappled with such complexities, requiring multiple legislative interventions to fine-tune its taxable base and restore some certainty to its tax system. The newly approved decree in February 2026 for Italy is already facing similar scrutiny, with legal experts highlighting the ambiguities in calculating the taxable base.
On the Edge of Unconstitutionality: Legal Challenges Abound
A significant concern surrounding these taxes is their retroactivity. The EU’s own proposal in October 2022 required implementation for years 2022 and/or 2023, effectively making the tax retroactive for much of the 2022 fiscal year. Retroactive taxation is generally considered contrary to fundamental legal principles, particularly in criminal law, and often deemed unconstitutional in many jurisdictions because it undermines legal certainty and predictability for economic actors.
Beyond retroactivity, the constitutionality of these taxes has been challenged on other grounds. Italy’s initial windfall tax faced questions regarding the non-deductibility of certain taxes when calculating the base, and for differential treatment of companies in similar sectors. The complexity of their design has also led to increased compliance costs and numerous legal disputes. Perhaps most notably, ExxonMobil sued the European Council in December 2022, arguing that the EU had exceeded its powers by enacting the "solidarity contribution" through an emergency procedure (Article 122 of the EU Treaty) that bypasses the European Parliament and does not require unanimity among Member States. This move highlights the precarious legal footing of some of these measures and the potential for prolonged legal battles.
Impact on Investment, Jobs, and Energy Security
Perhaps the most detrimental long-term effect of windfall taxes is their chilling effect on investment. When companies face punitive taxation on unexpected profits, they become less inclined to invest in new exploration, production, research and development, or other risky, capital-intensive projects. This reduced investment inevitably leads to a decrease in future energy supply, potentially exacerbating energy shortages and driving up prices for consumers in the long run.
The EU Commission’s own report acknowledged that "diverging implementation strategies across Member States have reportedly led to significant investor uncertainty" and, consequently, proposed ending these measures. Yet, contrary to this recommendation, some countries have pressed ahead. Repsol, one of Spain’s largest oil producers, publicly criticized the potential permanence of Spanish windfall taxes in late 2023, warning that it could impact investment decisions, including where to locate its green hydrogen business, which requires massive upfront capital. This is particularly ironic given that the Spanish government later announced €800 million in EU funds to develop green hydrogen plants, underscoring the mixed signals and policy contradictions.
The Spanish wind sector association also voiced concerns in April 2026, warning that a new EU-wide windfall tax could adversely affect renewable technologies if applied indiscriminately, creating "legal uncertainty and scar[ing] away investors, precisely at the moment when it is most necessary to invest in technologies such as wind power, as a substitute for imported fossil fuels." Similar warnings have come from the UK, where 42 energy companies, including Shell and BP, cautioned in August 2024 that constant changes and increases to the windfall tax threatened £200 billion of investment across all energy forms, including renewables. By reducing investment allowances that incentivize reinvestment, these policies not only hurt the oil and gas industry but also penalize firms investing in cleaner energy solutions.
Such policies can accelerate the decline of domestic oil and gas production
