From September 1, 2026, the Spanish government will raise its diesel subsidy to 20 cents per litre after diesel prices jumped 15.7% year on year in July. Confirmed by Real Decreto-ley 18/2026, the increase is intended to cushion inflation’s impact on households and businesses that rely on diesel vehicles.
Data from the Instituto Nacional de Estadística (INE) show diesel prices rose more sharply in July than gasoline prices compared with the previous year. The increase automatically activated a government clause allowing a higher subsidy when inflation crosses the 15% threshold. In August, diesel and gasoline both received a 10-cent discount per litre, but only diesel support will double in September. Gasoline aid, by contrast, will fall to 5 cents per litre, reflecting a more moderate 7.3% annual price increase for petrol.
The government uses a sliding scale of support, with subsidy reductions planned unless inflation spikes. The current discounts are set to expire on September 30, and no extension has been announced for October. Without new measures, Spanish motorists could face the full force of global fuel price volatility as autumn begins.
The ongoing conflict in the Strait of Hormuz is a major driver of the diesel price surge. The critical maritime route between Iran and Oman carries about 20% of the world’s oil supply. Since hostilities between the United States and Iran erupted in late February, shipping disruptions and market uncertainty have pushed diesel prices to record highs. Prices peaked at an average of €1.942 per litre on March 21, 2026, the International Energy Agency noted.
The government’s intervention offers temporary relief, but the broader outlook for fuel prices remains uncertain amid persistent tensions in global energy markets and no clear timeline for resolving the Hormuz crisis. For Spanish drivers, the coming weeks will determine whether state support continues or they must absorb future price hikes alone.
Spain’s vehicle fleet has also faced regulatory and economic pressures in recent years. A recent analysis found that, although most vehicles passed the 2025 ITV inspection, emissions and lighting failures remained a concern for many owners, an issue tied to rising fuel costs and developing environmental standards. More details are available in the report on Spain’s 2025 ITV inspection outcomes.
