USMCA rules of origin for goods made in Mexico: a buyer’s orientation

There is a costly assumption hiding in many nearshoring decisions: that because a product is manufactured in Mexico, it automatically enters the US duty-free under USMCA. It does not. “Made in Mexico” and “originating under USMCA” are different things, and the gap between them can be a duty bill you did not budget for.

This page is an orientation — not a legal determination — to how a product made in Mexico qualifies for preferential treatment under USMCA, and why IMMEX efficiency does not, by itself, guarantee origin.

Editorial note. This information is general and is not legal, tax, customs or trade-compliance advice. USMCA rules of origin are technical, product-specific and subject to official interpretation. Any origin determination must be based on the official agreement text and qualified advisors. This site is an independent editorial resource operated by Heberey LLC; it does not represent CBP, the SAT, the Secretaría de Economía, or any authority.

Two different questions

A product made in Mexico raises two separate questions:

1. How does it enter Mexico and get produced? That is where IMMEX lives — temporary import, inventory control, customs.
2. Does the finished good qualify for preferential treatment entering the US? That is where USMCA rules of origin live.

A supplier can be excellent at the first and still produce a good that fails the second. The two must both be handled; do not let a strong IMMEX story stand in for an origin analysis.

How a good can “originate”

In general terms, USMCA provides several paths for a good to be considered originating. At an orientational level:

• Wholly obtained in the region (for example, certain raw materials);
• produced entirely from originating materials;
• meets the product-specific rule of origin for its tariff classification.

That third path is where most manufactured goods land, and it usually turns on one or both of the following.

Tariff shift

A tariff classification change requires that non-originating inputs be transformed enough that the finished good is classified under a different tariff heading or subheading than its inputs. In plain terms: the processing in the region must change what the thing is, in tariff terms.

Regional value content (RVC)

Regional value content measures how much of the product’s value comes from the USMCA region. Article 4.5 gives the importer, exporter or producer a choice between two methods:

• Transaction value: RVC = (TV − VNM) / TV × 100, where TV is the transaction value adjusted to exclude international shipment costs.
• Net cost: RVC = (NC − VNM) / NC × 100, where NC is the net cost of the good.

In both, VNM is the value of non-originating materials, including materials of undetermined origin. A component you cannot trace counts against you exactly like a component you know is foreign.

Note what Article 4.5 does not do: it defines the methods, not the threshold. The percentage a given product must reach lives in the product-specific rule for its classification in Annex 4-B. Secondhand summaries often present “60% transaction value / 50% net cost” as a general USMCA rule; those figures are a common pattern in the product-specific rules, not a baseline set by Article 4.5.

Find the rule for your product’s tariff classification in Annex 4-B before you model anything. Treat any percentage you hear secondhand as a prompt to verify, not as your rule.

De minimis

Article 4.12 lets a good still originate when the non-originating materials that fail the applicable tariff change are not more than 10 percent of either the transaction value of the good (adjusted to exclude international shipment costs) or its total cost — provided every other requirement of the chapter is met.

This is the provision most often repeated as “you get 10% foreign content.” Three limits in the same article say otherwise:

• It does not free that value from an RVC test. Article 4.12.2: if the good is also subject to a regional value content requirement, the value of those materials is still included in VNM for the RVC calculation. De minimis forgives the tariff shift, not the arithmetic.
• Textiles and apparel are carved out. Article 4.12.4 sends them to Article 6.1 instead.
• There is an exceptions annex. Article 4.12.1 opens with “except as provided in Annex 4-A.”

Article 4.12.3 runs the other way and is worth knowing: a good otherwise subject to an RVC requirement does not have to meet it if all non-originating materials are not more than 10 percent of transaction value or total cost.

USMCA origin is not the only origin

Qualifying under USMCA answers one question: whether the good receives preferential duty treatment. It does not settle where the good is from for every other purpose. US law runs more than one origin test, and they can reach different answers about the same shipment.

Three matter to a buyer sourcing in Mexico with Chinese inputs:

• Preferential origin — the USMCA rules above. Decides preference.
• Marking origin — decided under the rules in 19 CFR Part 102. Decides what the label must say.
• Origin for trade remedies — including Section 301 duties on goods that are the product of China. Here CBP applies the traditional substantial transformation test: were the inputs transformed into a new and different article of commerce?

A good can pass one and fail another.

A documented case

In HQ H300226 (13 September 2018), CBP reconsidered a ruling on brushed electric motors assembled in Mexico from three Chinese-origin components. The holding is short enough to read in full:

The country of origin of the electric motor for purposes of marking is Mexico. The country of origin of the electric motor for purposes of the application of subheading 9903.88.01, is China.

Subheading 9903.88.01 is the Section 301 line that applies an additional 25 percent ad valorem duty to articles that are the product of China. Same motors, same assembly in Mexico, two different countries of origin — because two different rules were being applied to two different questions.

Note what the ruling does not say. It was decided under the NAFTA Marking Rules in 19 CFR Part 102 — the marking framework carried into the USMCA era — and it addresses marking and Section 301. It is not a ruling on USMCA preferential eligibility. Read it as evidence that processing sufficient under one origin rule can be insufficient under another, not as a statement about what preference the motors received.

What that means in sourcing

If the Mexican operation is largely assembly of Chinese components, the origin conversation has two halves, and clearing the first does not settle the second:

1. Does the finished good meet the USMCA product-specific rule for its classification — tariff shift, RVC, or both?
2. Would CBP consider the Chinese inputs substantially transformed in Mexico for trade-remedy purposes?

The evidence that answers both — bill of materials, classification and origin of each component, and a description of the processing performed — sits with the supplier, not with you. Ask for it during qualification, while you still have leverage, and agree in writing who keeps it and for how long. A supplier who cannot produce a component-level origin breakdown cannot support a certification, whatever the certificate says.

Automotive is its own world

If you source automotive goods, be aware that USMCA imposes a stricter, specialized regime: higher regional value content thresholds, core-parts requirements, a labor value content component, and steel/aluminum purchasing requirements. These rules are detailed and phased. If your product is automotive, treat the general explanation above as background only and go straight to the specific automotive provisions and a specialist.

The certification of origin

USMCA does not prescribe a government form. Instead:

• the importer, exporter or producer may certify origin (Article 5.2);
• the certification must include the nine minimum data elements of Annex 5-A;
• it can appear on an invoice or a separate document.

The nine elements are: the certifier’s role (importer, exporter or producer); certifier; exporter; producer; importer; description and HS tariff classification of the good; origin criteria; blanket period; and authorized signature and date.

Seven of the nine are addresses and identifiers. The one that carries the work is origin criteria — the statement of how the good originates. That is the field a supplier cannot fill honestly without having done the analysis.

Records. Article 5.8 sets both sides of the obligation: the importer keeps the documentation, including the certification the claim rested on, for no less than five years from the date of importation; the exporter or producer who completed a certification keeps the records showing the good is originating for five years after the certification was completed.

If you missed the claim. Article 5.11 lets an importer claim preference and seek a refund of excess duties after the fact, if the good would have qualified at the time of importation — no later than one year after the date of importation, or longer where the importing country’s law allows.

As a buyer, two questions matter: who will provide the certification, and on what basis. A supplier who cannot answer the second clearly may be certifying on hope.

Why this belongs in sourcing, not after

Origin affects the duties you pay, which means it affects landed cost — the number that actually decides a sourcing case. Discovering an origin problem after committing to a supplier is expensive and slow to unwind. That is why origin belongs in qualification and in the RFQ, not in a post-mortem.

A short buyer’s checklist

• Is the product expected to qualify under USMCA, and under which path?
• If Chinese inputs are involved, has anyone asked the substantial transformation question separately from the USMCA one?
• What rule applies to its tariff classification (tariff shift, RVC, both)?
• Who provides the certification of origin, and on what basis?
• Are records kept to support the certification?
• For automotive, are the specialized rules addressed by a specialist?

Recommended official sources

For any origin determination, consult directly:

• the USMCA / T-MEC official text, including the rules of origin and certification provisions;
• US Customs and Border Protection guidance on USMCA;
• SNICE / Secretaría de Economía, for tariff classification;
• and qualified trade-compliance advisors familiar with your product.