Mexico's Finance Ministry Cuts Diesel Incentive to 20% After US-Iran Hormuz Deal

The Ministry of Finance and Public Credit published on June 19, 2026, in the Diario Oficial de la Federación (DOF) a reduction of the diesel fiscal incentive from 39% to 20% and of regular gasoline from 15% to 9.8%, effective June 20-26, in response to the preliminary US-Iran ceasefire agreement that guaranteed free passage through the Strait of Hormuz and pushed international crude prices lower.

The adjustment mechanism operates through the Special Tax on Production and Services (Impuesto Especial sobre Producción y Servicios, IEPS) on fuels, a fiscal policy instrument that absorbs or passes on to consumers fluctuations in international oil prices. When crude rises, the incentive grows to cushion the impact at the pump; when it falls, the Finance Ministry reduces it and recovers tax revenue. The agreement formalized on June 19 reopened the Strait of Hormuz, through which roughly 20% of global oil flows, collapsing the geopolitical risk premiums that had pushed Brent and WTI above $100 per barrel. According to Expansión data, the Mexican crude blend had fallen 33.1% from recent highs.

The DOF adjustments for the week of June 20-26 are as follows:

- **Diesel:** incentive reduced from 39.10% to 20.89%; IEPS rate of 5.83 pesos per liter; 1.50 pesos/liter less relief for the end consumer. - **Regular gasoline (Magna):** incentive reduced from 15.22% to 9.89%; IEPS rate of 6.04 pesos per liter; 0.60 pesos/liter less relief. - **Premium gasoline:** no subsidy for the third consecutive week; IEPS rate of 5.66 pesos per liter.

The 19-percentage-point cut in the diesel incentive is the most consequential, given that diesel is a direct input for freight transport, food distribution, and the agricultural sector. Distribution costs do not adjust immediately, as the final pump price also depends on the exchange rate, logistics, and import volumes.

The US-Iran agreement provides for 60 days of continuous negotiations toward a permanent settlement. The next weekly DOF publication, expected on June 26, will determine whether incentive adjustments continue or reverse depending on crude price behavior that week.

This article was written with artificial intelligence assistance based on verified sources and reviewed by a human editor before publication.