Spain's diesel tax cut is not a subsidy: it's a tax discount

Diesel cut: a subsidy or a tax discount paid for by EV drivers?

There is a paradox in Spain's energy policy that few dare to explain: while an electric car driver receives subsidies to buy their vehicle, a diesel driver gets a 20-cent-per-litre cut. Who pays whom? The answer is not as simple as it seems, and the debate over the diesel cut has uncovered a deeper discussion about who subsidises whom in the energy transition.

The cut is not a subsidy: it's a tax discount

The 20-cent cut on diesel is not a direct subsidy, but a reduction of the hydrocarbons tax. Under the royal decree, it is triggered automatically when fuel prices rise more than 15% year-on-year. Right now, the cut is 10 cents, not 20, and its effect on the final price is limited. In fact, diesel prices have returned to pre-measure levels, suggesting that oil companies are absorbing part of the discount.

VAT on the tax: double taxation or legality?

One of the most controversial points is the VAT applied on top of the hydrocarbons tax. Petrol 95 carries 0.47269 euros per litre in tax, and VAT of 21% is applied on that figure, adding almost ten extra cents. Some argue this is illegal double taxation, but Article 78 of the VAT Law expressly allows it. However, recent history offers a precedent: the céntimo sanitario (a regional fuel tax), levied between 2002 and 2011, raised 13 billion euros (1.25% of GDP) and was struck down by the EU Court of Justice in 2014 for failing to comply with the excise duties directive. Legality is not always synonymous with legitimacy.

The hidden cost of the electric car

Meanwhile, electric car drivers receive purchase subsidies, but arguments also exist about their hidden costs. Battery production requires lithium, whose extraction and recycling are complex and polluting. Moreover, the electricity that powers these vehicles is also subsidised at the generation stage. So the question of who subsidises whom has no clear answer.

Are we witnessing a subsidy war between technologies, or simply two forms of public intervention that feed off each other? The fact is clear: the consumer always pays, whether at the pump or on the electricity bill. The question is whether anyone will ever do the full maths.