Key Takeaways:
The expiration of the USMCA trade pact without an extension threatens to upend a supply chain that moves more than $300 billion in auto parts and vehicles across North America each year.
The USMCA trade agreement between the U.S., Mexico and Canada expired without an extension on July 1, leaving the auto industry — which accounts for roughly 18% of trilateral trade — facing a patchwork of tariff risks and supply chain disruptions that could raise vehicle costs by thousands of dollars.
"The absence of a framework creates immediate uncertainty for every OEM with cross-border production," said Aakash Arora, managing director and North America auto and mobility sector leader at Boston Consulting Group. "Companies cannot make capital allocation decisions without knowing the rules of the road."
The American Automotive Policy Council estimates the auto sector represents about 18% of all trade among the three nations. Mexico has requested a 16-year extension, while the Trump administration has pushed for stricter local-content requirements, including a potential 50% U.S.-content threshold for vehicles assembled in Mexico and Canada. BCG analysis shows many vehicles currently assembled in those countries fall well short of that mark.
If negotiations fail to produce a new framework by 2036, the entire pact dissolves. In the nearer term, automakers face a choice: restructure supply chains to meet tougher content rules — a process that takes years and billions of dollars — or shift production outside North America entirely, a scenario Arora warns is a real possibility.
The 50% Content Gap
BCG's analysis found that a significant portion of vehicles assembled in Mexico and Canada contain less than 50% U.S.-sourced content, making compliance with the proposed threshold difficult without major retooling. The previous USMCA already required 75% regional value content — up from 62.5% under NAFTA — but the new push targets U.S.-specific content rather than North American content. Closing that gap would require automakers to relocate parts sourcing and assembly lines, a multiyear process that could cost individual OEMs hundreds of millions of dollars.
The last major trade escalation in North America — the 2018 Section 232 tariffs on steel and aluminum — pushed input costs up by roughly $350 per vehicle, according to the Center for Automotive Research. A failure to extend USMCA could trigger far larger cost increases if tariffs revert to most-favored-nation rates under the World Trade Organization, which average about 2.5% for passenger vehicles but could rise to 25% for light trucks.
Unintended Consequences of Tougher Rules
Conventional logic holds that stricter content requirements would boost U.S. manufacturing. Arora's research suggests the opposite may occur. Some OEMs could choose to exit North American production entirely rather than bear the cost of compliance, shifting assembly to Asia or Europe where labor and supply chain costs are lower.
"Tougher rules could push production out of North America, not into the United States," Arora said. "That's the paradox policymakers need to consider."
The uncertainty is already weighing on sector sentiment. Automakers with heavy exposure to Mexican production — including General Motors Co., Ford Motor Co. and Stellantis NV — face the most immediate risk. Together, the three Detroit automakers operate more than a dozen assembly and powertrain plants in Mexico, according to company filings.
Negotiations between the U.S. and Mexico are expected to intensify in the coming months, with Canada likely to join later. The previous USMCA review clause, which triggered the current renegotiation, was designed to prevent the pact from lapsing without a replacement. But with no extension secured, the clock is now ticking toward a 2036 expiration — and the auto industry's integrated North American supply chain hangs in the balance.
This article is for informational purposes only and does not constitute investment advice.
