Spain's Inflation Surges to 3.4% as Iran Conflict Drives Record Fuel Price Hikes

Spain's year-on-year inflation climbed to 3.4% in March 2026, its highest level since June 2024, driven by a sharp surge in fuel prices following the start of the conflict in Iran on February 28, according to final data published by the National Statistics Institute. The monthly CPI increase reached 1.2%, the sharpest monthly rise since June 2022, and came in one tenth above the agency's preliminary estimate. The result marked a jump of 1.1 percentage points compared to February's rate. Liquid fuels — a category covering heating oil, fuel oil, and lamp oil — recorded the steepest monthly increase at 30%, the highest since the INE began collecting that data in 2002. Diesel rose 20.1% and gasoline 8.1% in the same period, with the combined vehicle fuel index posting its second-largest monthly gain in the entire INE series, surpassed only by March 2022, one month after Russia's invasion of Ukraine began.

Spain experienced a severe inflationary episode following Russia's invasion of Ukraine in February 2022, when fuel prices similarly acted as the primary transmission mechanism for energy costs into the broader economy. The Spanish government responded to that crisis with a series of anti-crisis packages — ultimately seven in total, according to government sources cited in the articles — including fuel tax cuts and direct subsidies. The current inflationary shock mirrors that pattern, with fossil fuels again serving as the main channel through which the external conflict is feeding into domestic prices. More than 90% of goods in Spain travel by road, making fuel costs a particularly acute pressure point for the wider economy.

Liquid fuels (heating oil): 30, Diesel: 20.1, Vehicle fuels combined: 14.3, Gasoline: 8.1

The Spanish government approved an anti-crisis package on March 20, 2026, endowed with and more than 2,000 million euros in guarantees for companies, for a combined value of over 7,000 million euros. The package included reducing VAT on fuels from 21% to 10%, cuts to the Hydrocarbons Tax to the minimum level permitted by the European Union, and bonuses of 20 cents per liter for farmers and transporters. Because the measures only took effect from March 22, they influenced just the final week of the month. The analysis center Funcas estimated that without those fiscal measures, March inflation would have reached 3.7% rather than 3.4%. INE data on constant-tax CPI confirmed the cushioning effect: without the cuts, diesel's monthly increase would have been 24.9%, gasoline's 14.2%, and heating fuels' 37%. Funcas warned that general inflation could approach 4% in coming months, reaching an annual average of 3.5%, provided the government's measures remain in place until October — and rising to an annual average of 3.8% if they are withdrawn in June as currently scheduled.

Fuel price changes with and without fiscal measures, March 2026: Diesel monthly increase (before: 24.9% (without measures), after: 20.1% (with measures)); Gasoline monthly increase (before: 14.2% (without measures), after: 8.1% (with measures)); Heating fuels monthly increase (before: 37% (without measures), after: 30% (with measures)); General year-on-year inflation (before: 3.7% (without measures), after: 3.4% (with measures))

Unions demand price controls as business groups warn of upward revisions Spain's two largest union confederations, CCOO and UGT, responded to the data by demanding that the government go further than its existing package. CCOO, led by Secretary General Unai Sordo, called for price control mechanisms to prevent cost pass-through to consumers, free public transport, and a cap on rental prices, arguing that the approved fiscal measures remain insufficient to contain a price increase that risks spreading across the entire shopping basket. UGT focused its demands on expanding wage guarantee clauses to protect workers' purchasing power, alongside direct aid for the lowest-income households. The main opposition party's deputy secretary of Economy and Sustainable Development, Alberto Nadal, warned that the measures are insufficient for middle-class households. Government sources told reporters that the analysis of the package's impact is continuous and that the executive has not ruled out adopting further measures if necessary, describing the current package as a first-response instrument. The Spanish Confederation of Business Organizations maintained its average CPI forecast of 2.9% for 2026 but warned it could revise that figure upward if the conflict in Iran is prolonged and energy price increases spread further into the broader consumer basket, predicting transitory rates above 3% if a quick resolution is not reached. The Brent crude oil benchmark exceeded 114 dollars per barrel during the conflict before retreating below 100 dollars, though it remained well above the approximately 72 dollars recorded before hostilities began, according to La Razón.