Mexico’s auto exports fell 12% in September from a year earlier as U.S. tariffs hit the country’s leading industrial sector. Monthly vehicle output dropped 15%. The United States remains the largest market for Mexican vehicles, so production and export decisions remain exposed to policy set across the border.
Tariffs Set the Terms
The September export decline marked the steepest fall since December 2025 and the biggest slump so far this year, according to data the statistics office INEGI released Wednesday. Domestic sales rose 8%, helping cushion the impact. That uptick offered some relief. It didn’t erase the drop in exports or output.
Mexican cars still face U.S. tariffs of 25. Mexican officials estimate that meeting rules requiring North American-sourced parts can reduce the tariff burden to 10% to 12%. Manufacturers must navigate rules about where components come from as they try to reach their biggest market.
Government officials are reviewing the U.S.-Mexico-Canada free trade pact. But the review hasn’t changed the tariffs Mexican cars face: they remain at 25%, or 10% to 12% for vehicles meeting the parts rules, according to Mexican officials. The pact is under review, while the tariff structure continues to shape the cost of access.
The two economies became closely intertwined over more than three decades of successive free trade agreements. Sudden policy shifts and tariffs under the Trump administration have shaken business owners’ trust in long-established supply chains. Those accumulated links didn’t insulate manufacturers from a change in the rules.
Production Follows Power
“This has generated greater uncertainty for carmakers and it has affected production and export decisions,” said Janneth Quiroz, economic analysis director at Monex. She identified Mexico’s reliance on the U.S. market as the sector’s biggest risk.
General Motors announced last year a $4 billion push to shift some production from Mexico to the United States as it navigates tariff policies. The Chevrolet-maker, Ford and Nissan all reported significant export declines in September. Mercedes-Benz shut a joint plant with Nissan last May and produced and exported no cars last month. It was the first time that had happened since the company began shipping abroad eight years ago.
Tariff policy reaches beyond the border crossing. Companies are changing production plans, and output in Mexico has fallen. Alejandra Vargas, an analyst at Ve Por Mas, or Bx+, said a sustained slowdown could affect automakers’ investment decisions, Mexico’s manufacturing activity and overall economic growth. Her warning describes possible consequences, not an outcome already recorded in the September figures.
A Market Still Dominated by the U.S.
South Korea’s Kia, Germany’s BMW and Japan’s Mazda picked up some of the slack. Mazda more than doubled its monthly exports. Those gains came as the Chevrolet-maker, Ford and Nissan reported significant declines, leaving September exports down 12% from a year earlier.
At a press conference Wednesday, Mexico’s main auto chamber, AMIA, said Mexico remains the top foreign provider of cars in the United States, supplying 16% of light vehicles in a market that has shrunk 2% so far this year. AMIA data also showed exports to the United States fell 5% in the first nine months of 2026, while Canada, Mexico’s next-biggest market, increased its purchases by just over 9%.
“The September data is a warning sign rather than a crisis signal,” Quiroz said. “If this trend continues into 2027, then we could indeed be talking about a more structural problem for Mexican manufacturing.” Vargas said the trade relationship between Mexico and the United States “will continue to be the main factor determining the industry’s course in the coming months.” The industry’s direction remains tied to decisions made through that trade relationship.