Moving production to Mexico can zero out duties, but only if the goods actually qualify. How USMCA origin rules work, what documentation they demand, and how to model the real savings.
The US-Mexico-Canada Agreement grants duty-free treatment to goods that originate in a member country, and originating is a technical term. For most products, the rule is either a tariff shift, meaning the manufacturing in Mexico transforms the inputs enough to change their classification, or a regional value content threshold, meaning enough of the product's value comes from North America. The specific rule lives in the product-specific annex and varies by heading, so two products from the same factory can have different qualification paths.
The de minimis rule adds flexibility: a small percentage of non-originating materials can be disregarded. But the tolerance is narrow, and it does not apply to every product. Brands that assume their goods qualify because they are made in Mexico, without checking the product-specific rule, are the ones that discover the problem during a customs verification, years after they stopped paying duty.
Regional value content is where nearshoring math gets real. The common methods, transaction value and net cost, compute the North American share of the product's value differently, and the choice of method can decide whether the goods qualify. A product assembled in Mexico from Asian components might fail under one method and pass under the other. The components' origin, the factory's cost structure, and the profit allocation all feed the calculation.
This is why sourcing decisions and origin math have to happen together. Switching a component supplier from Asia to the US can flip a product from non-qualifying to qualifying, which is worth far more than the component price difference when the duty rate is high. The brands that capture the full USMCA benefit treat the bill of materials as an origin document, tracking component origins with the same discipline they track costs.
USMCA eliminated the old NAFTA certificate format in favor of a certification that can take any form, as long as it contains the required data elements: the certifier, the producer, the goods description, the origin criterion, and the blanket period. The flexibility is convenient and dangerous. An informal email with the right data elements can serve as a certification, which means importers sometimes hold something they do not recognize as a legal document.
The importer is responsible for the claim's validity. If customs questions the preference claim, the importer must produce the certification and support the origin analysis. A verification can reach back to the producer in Mexico, and if the producer cannot substantiate the origin criterion, the preference is denied and duties are assessed retroactively with interest. Get the certification before claiming, keep it for the record retention period, and make sure the producer understands what they certified, because their records are your defense.
The headline savings are the eliminated duties, but the honest model includes the offsets. Mexican production costs, logistics reconfiguration, the compliance cost of origin management, and any transitional dual-sourcing all reduce the net benefit. Against those, credit the non-duty wins: shorter lead times, lower freight volatility, easier factory oversight, and tariff-risk diversification away from single-country exposure.
Run the model per product, not per factory. Origin qualification is product-specific, so a factory can produce qualifying and non-qualifying goods side by side. The products with high MFN rates and clean tariff-shift paths are the nearshoring winners; the products with low rates or tangled supply chains may not justify the move on duty savings alone. And revisit the model when sourcing changes: a new component supplier can silently break qualification, turning duty-free goods into dutiable ones without anyone noticing until the verification letter arrives.
No. Transshipment does not confer origin. The goods must undergo sufficient production in Mexico to meet the product-specific rule. Routing Asian goods through a Mexican warehouse changes nothing about their origin.
A certification can cover a blanket period of up to twelve months for recurring shipments of identical goods. Track the blanket period and renew before it lapses; entries after expiration without a new certification lose the preference.
Yes. The certification can be completed by the importer, exporter, or producer. But whoever certifies takes responsibility for the claim's accuracy, so importers who self-certify need the same origin analysis and producer records they would demand from anyone else.