China's Ministry of Commerce (MOFCOM) delivered its most pointed rebuke yet of Mexican trade policy on March 25, capping a six-month investigation by formally designating Mexico's recently enacted import tariffs as barriers to trade and investment. And, most crucially, reserving the right to impose countermeasures. 

The announcement marks a major escalation in a bilateral dispute that has been building since Mexico's Senate approved sweeping tariff increases in December, and it places the Sheinbaum administration in an increasingly exposed position as it simultaneously navigates USMCA renegotiations with Washington.

The MOFCOM determination, released on March 25, found that Mexico's measures — tariffs of between 5% and 50% on roughly 1,463 product classifications from countries with which Mexico has no free trade agreement — have materially impaired the competitiveness of Chinese firms and restricted the flow of Chinese goods, services and investment into the Mexican market. 

According to MOFCOM, the affected Chinese export value exceeds $30bn annually, with the mechanical and electrical sectors alone accounting for an estimated $9.4bn in losses, and the automotive sector a further $9bn. The ministry stopped short of announcing specific retaliatory actions but stated that it is "authorised to apply relevant measures to firmly safeguard the interests of Chinese industries," as per Xinhua.

The stakes are not trivial. China is Mexico's second-largest trading partner, with bilateral commerce estimated at approximately $139.7bn in 2024, of which $129.8bn comprised Mexican imports from China, generating a deficit of close to $120bn in Beijing's favour. That structural asymmetry has historically insulated the relationship from serious rupture: Mexico's manufacturing base, from consumer electronics to automotive supply chains, is deeply integrated with Chinese inputs. Any credible retaliatory action from Beijing targeting Mexican exports — which are concentrated in electronics, minerals and intermediate industrial goods — or restricting Chinese-origin investment in nearshoring projects would carry material economic costs.

Mexico's Economy Secretary, Marcelo Ebrard, appeared unrattled on March 25, defending the tariffs at the annual assembly of Nuevo León's industrial chamber (CAINTRA) as a legitimate corrective to structural unfairness rather than an act of protectionism. His central argument was one of competitive distortion: Chinese steel is arriving in Mexico at $150 per tonne, a price that, he argued, reflects state subsidies and below-market cost structures that Mexican producers cannot replicate. 

He extended the same logic to the automotive sector, contending that Chinese vehicle pricing is, in some cases, below inventory cost, a dynamic he said is capable of forcing any market-rate competitor out of business. "We put tariffs in place so that the playing field, which is very uneven in favour of these companies, begins to level out," Ebrard said. "That is a right Mexico has."

The legal framing matters. Both Mexico and China have invoked the WTO as their reference framework, though to opposite ends. President Claudia Sheinbaum's administration has argued that the new tariff levels fall within Mexico's bound rates under Most Favoured Nation (MFN) commitments, meaning they do not technically breach WTO ceilings. 

China, meanwhile, has denounced the measures as inconsistent with WTO disciplines, with Shi Xiaoli of the China University of Political Science and Law's WTO Law Research Centre telling the Global Times that, should bilateral consultations fail to produce a resolution, Beijing would bring a formal complaint to the WTO and pursue countermeasures in parallel.

What makes this dispute analytically distinct from a standard bilateral trade row is the extent to which it is structured by a third party: the United States. The tariffs did not emerge in a vacuum. Mexico's December legislation — passed 76 to five with 35 abstentions, and substantially revised from the original September presidential proposal — arrived precisely as Mexico and the US entered the run-up to the USMCA joint review, which must be initiated by July 1, 2026. 

Washington has been explicit for years that it regards Mexico as a potential backdoor for Chinese manufacturers seeking tariff-free access to the US market under the trilateral agreement, particularly in electric vehicles and auto components. Mexican tariff increases on Chinese goods are widely read by analysts, including Capital Economics, as a partial concession to those American concerns, designed to mitigate the risk of punitive outcomes during the USMCA review.

Ebrard acknowledged the US dimension on March 25, noting that the first formal round of bilateral trade talks between Mexico and the United States had taken place the previous week, with four working groups examining North American production expansion and reducing dependency on Asian inputs in strategic sectors, particularly pharmaceuticals. 

He argued that Mexico retains a singular negotiating advantage: 85% of its exports to the United States currently enter duty-free, a position he described as the strongest of any US trading partner barring Canada. Whether that advantage survives the USMCA review intact will depend partly on how credibly Mexico can demonstrate supply-chain separation from China, which is precisely what the new tariff regime is intended to signal.

The investigation's findings also documented non-tariff barriers. MOFCOM reported that Chinese companies in the automotive and textile sectors claimed their products were being disproportionately targeted in USMCA rules-of-origin certification reviews, with Mexican customs authorities demanding granular documentation of supply-chain arrangements involving Chinese components. 

Some firms reported goods held at Mexican ports for weeks or months without justification, incurring substantial demurrage costs. Mexico's expanded application of Normas Oficiales Mexicanas (NOM) certification requirements, involving testing cycles of six to ten weeks, was also cited as a source of systemic delay. These complaints suggest that the friction between the two countries extends well beyond the headline tariff numbers.

Mexico has for now given no indication it will modify the tariff regime. Ebrard reiterated that the measures are grounded in rights Mexico is entitled to exercise under international trade rules, and that they carry no animus toward China or any other country. Beijing, for its part, has voiced a preference for dialogue over immediate escalation, with MOFCOM maintaining diplomatic channels with Mexican counterparts. 

A group of 200 Mexican and Asia-Pacific business leaders are scheduled to meet in Mexico City in April under the APEC Business Advisory Council (ABAC) framework. At this venue, the tariff question is expected to feature prominently on the agenda.

The collision course between the two countries, however, reflects a deeper structural tension that bilateral diplomacy alone is unlikely to resolve. Mexico is attempting to satisfy US demands for supply-chain decoupling from China whilst preserving its own manufacturing competitiveness — much of which is currently underwritten by access to competitively priced Chinese inputs. 

Threading that needle, without triggering retaliatory measures from Beijing that would undermine the very industrial base the tariffs are meant to protect, will define one of the more consequential trade policy challenges of Sheinbaum's presidency.