Mexico’s mandatory product standards — the Normas Oficiales Mexicanas (NOMs) — are the number-one reason cargo gets held at customs for something that has nothing to do with taxes. The importer paid everything correctly… and the freight sits there because the labels don’t comply. The worst part: it’s 100% avoidable if you deal with it before the cargo ships.
The two you’ll run into most
| Standard | What it covers | What it requires (in short) |
|---|---|---|
| NOM-050-SCFI | General consumer products that are not food | Commercial information in Spanish: product name, importer details, country of origin, contents, characteristics |
| NOM-051-SCFI/SSA1 | Prepackaged food and non-alcoholic beverages | Commercial and health information, the nutrition panel and the front-of-pack warning labels (the black seals) |
Both apply equally to domestic and imported product. And both get checked at clearance.
But there are plenty more
Depending on your product, there are NOMs for electrical safety, energy efficiency, telecom equipment, toys, textiles, tires… Which ones apply isn’t a judgment call — it’s decided by your tariff code. Look yours up in the calculator and check the regulatory file: that’s where the NOMs and permits tied to your code show up.
How compliance is proven
- NOM certificate — issued by an accredited certification body. This is what product standards (safety, efficiency) demand.
- Statement of conformity — issued by an accredited verification unit. The usual route for commercial-information and labeling standards.
- Non-applicability letter — for when your product sits in a tariff code subject to a NOM but, by its characteristics, the standard doesn’t apply. You document it; you don’t assume it.
The three ways to label (pick one before production)
- At origin: your supplier prints the packaging with the Mexican label. Cheapest and cleanest — but it takes planning and a supplier willing to cooperate.
- Adhesive sticker before shipping: applied over the original packaging at the factory. A solid middle ground.
- In a bonded warehouse (depósito fiscal) or facility in Mexico: you import, label here, then withdraw the goods. The most expensive and slowest option — but it’s the lifeline when the cargo already arrived mislabeled.
The conversation to have with your supplier: send the Mexican label artwork with the purchase order, not once the container is loaded. A packaging fix at the factory costs days; relabeling in a bonded warehouse costs weeks and thousands of pesos.
Mistakes we see all the time
- Translating the label from English but leaving off the importer’s details (the Mexican tax ID (RFC) and address are mandatory).
- Printing the country of origin in unreadable type, or only on the outer carton.
- Food with a correct nutrition panel but missing the warning seals it’s supposed to carry.
- Assuming “it’s a sample, so none of this applies” — samples have rules too.
- Leaving verification for the day of clearance — verification units book up.
Not sure which NOM your product falls under? Write to us with your tariff code or a description of the item and we’ll tell you what you need — before you ship, which is when knowing it actually helps.