NOMs (Normas Oficiales Mexicanas) are Mexico’s mandatory technical regulations: safety, commercial information, labeling, efficiency. On import, certain tariff codes require proof of NOM compliance before the goods can enter the country.
How they work at customs
The obligation is tied to the tariff classification: once your product is classified, you know which NOM applies and how compliance is proven, which can range from commercial information labeling to product certificates issued by accredited bodies. Compliance is verified at clearance, and there are schemes for labeling in authorized warehouses before definitive entry.
Why it matters when importing from China
Consumer products are the classic case: electronics, textiles, toys, appliances. A Chinese factory will not label for the Mexican market unless someone specifies it, and NOM compliance is met either with correct Spanish labels from origin or through an authorized labeling process at destination, with its own cost and time.
The common mistake
Discovering the NOM once the cargo is already in the bonded facility. By then the options are few and expensive. NOM requirements are resolved when the product is classified, before the purchase order: that way labeling leaves the factory correct and clearance never stalls.
In our purchasing consultancy in Asia, Mexican labeling is specified to the supplier with the order. Write to us before you order.
