Mexico customs overhaul could slow cross-border freight

Mexican President Claudia Sheinbaum is pushing an overhaul of the country's customs rules that could bring significantly more scrutiny to imported goods. The proposed amendments to Mexico's Customs Law, or Ley Aduanera, were submitted to the Chamber of Deputies as part of the government's 2027 economic package.

The legislation targets undervaluation, the practice of declaring imports below actual value to cut duties and taxes. One major change would remove the existing 50% undervaluation threshold tied to precautionary seizures in certain cases. Another would cut the difference-in-value threshold used to presume an infraction from 50% to 20% for goods entered under regimes where duties are calculated but not immediately paid.

The proposal was referred to the Finance and Public Credit Committee, which held a working session with customs officials and industry representatives. A committee vote could come as early as next week, and if approved and enacted, the changes would take effect the day after publication in the Diario Oficial.

Industry groups are warning of fallout. Mexico's automotive association AMIA says eliminating the 50% threshold could disrupt just-in-time manufacturing if components are seized during valuation disputes, while bonded warehouse operators raised concerns about congestion and storage costs.

Why it matters

Cross-border drivers and carriers could face more inspections, longer border waits, and loads held over paperwork disputes. If you run Mexico lanes, make sure customs documentation on declared values is airtight.