The change sounds simple. It is not. Mexico is turning to a familiar tax tool to keep a new oil spike from landing fully on drivers, but the first move is narrower than the headline suggests. President Claudia Sheinbaum says Hacienda will lower IEPS to cushion the impact of higher international prices. Yet the official relief already in force targets diesel first, while regular gasoline is being held down through a separate six-month agreement. The result is a two-track strategy with different effects at the pump.
What Sheinbaum is proposing
President Claudia Sheinbaum said Mexico will use lower IEPS charges to soften the impact of rising fuel costs. Her message was clear. If international prices continue to rise, the federal government will absorb part of the shock through taxes. For now, the measure already in force is narrower than that broader message. The weekly fiscal stimulus published by Hacienda for March 14 to 20 applies only to diesel. Regular gasoline and premium gasoline remain without that weekly tax relief.
For many international readers, IEPS needs a quick translation. It is a federal excise tax built into fuel prices. When oil or refined products are more expensive abroad, Mexico can temporarily lower the tax. That keeps the full increase from reaching consumers at once. It does not erase the increase. It means the government gives up part of its tax revenue to slow price increases at the pump.
Why diesel was first
The government’s first move focused on diesel for a practical reason. Diesel is central to freight transport, distribution, farming, and some public transportation. When diesel prices rise sharply, the impact extends beyond drivers who fill diesel tanks. It can raise the cost of moving food, retail goods, and industrial inputs across the country. That is why a diesel tax cut is often treated as an anti-inflation tool.
For the current week, Hacienda’s notice set the diesel stimulus at 35.21%. In practice, the government is giving up 2.5924 pesos per liter in IEPS revenue on that fuel. The diesel IEPS charge for the period falls to 4.7710 pesos per liter. By contrast, Magna and premium were left without a weekly stimulus. Their IEPS charges stay near 6.70 pesos and 5.66 pesos per liter.
What this means for gasoline prices
That does not mean gasoline was left completely unprotected. Mexico is also using a separate tool. It renewed a voluntary agreement with fuel retailers. The goal is to keep regular gasoline below 24 pesos per liter for six more months. Government and industry figures say the deal covers 96% of service stations in the country. The pact does not cover premium gasoline. It also does not automatically cap diesel.
This distinction matters. A lower IEPS is a tax adjustment. The 24-peso agreement is a commercial commitment by most stations that sell regular gasoline. One tool works through federal tax policy. The other works through retail pricing behavior. Together, they are meant to slow fuel inflation. But they do not work the same way, and they do not apply equally to every fuel.
Why Mexico is still exposed
Mexico produces oil and has expanded its refining capacity, but domestic prices still respond to international conditions. Fuel markets do not operate in isolation. Prices at Mexican stations reflect crude prices, imported fuel costs, logistics, exchange rates, and local competition. That is why a rise in global oil prices can still pressure consumers in Mexico.
The latest national averages help show the gap between fuels. On March 17, market data showed average prices of 23.66 pesos per liter for regular gasoline. It showed 26.48 pesos for premium and 28.18 pesos for diesel. Those are national averages, not fixed prices. What drivers pay still varies by city, highway corridor, supplier, and competition. A tax cut can reduce pressure. It does not guarantee identical prices across stations.
What to watch next
The next important step is the issuance of the next official tax notice. Sheinbaum’s remarks suggest broader relief for gasoline remains on the table if international pressure continues. The key question is whether Hacienda expands the weekly stimulus beyond diesel. It could also deepen the support already in place. Or it could keep relying on diesel relief plus the cap on regular gasoline.
There is also a clear trade-off behind the policy. Every peso not collected through IEPS helps contain fuel prices and inflation. It also reduces federal revenue. Mexico used this mechanism during earlier energy shocks, including the spike in 2022. This time, the government appears to be choosing a more selective response. That may be easier on public finances. It also means the relief will likely be uneven across fuels and regions.
With information from Diario Oficial de la Federación, N+, El Financiero
