Who holds your NOM certificate, and why it decides everything

The Normas Oficiales Mexicanas are Mexico's mandatory technical regulations, and a large share of imported goods cannot clear customs without evidence of compliance. Search for how to get certified and you will find a dozen competent explanations of the testing process, written by the laboratories and certification bodies that sell it.

What none of them says is who the certificate belongs to. It belongs to a Mexican legal person, and if that person is your distributor, they now hold something you cannot take with you.

Two things a European manufacturer gets wrong

One: that CE marking counts for something. It does not, in itself. Conformity assessment in Mexico is governed by the Ley de Infraestructura de la Calidad, published in the Diario Oficial de la Federacion on 1 July 2020, which replaced the old Ley Federal sobre Metrologia y Normalizacion. Under that framework, certification is issued by accredited Mexican conformity assessment bodies on the basis of testing by laboratories accredited in Mexico, largely through the Entidad Mexicana de Acreditacion. Your existing EU test reports may reduce the work in practice, and sometimes substantially, but they are not a substitute for the Mexican process and they do not create a right to recognition.

Budget for testing time, not just testing cost. This belongs in the go or no-go, not in the shipping plan.

Two: that the certificate follows the product. It follows the holder. The certificate names a Mexican legal person, and in the ordinary European entry that person is your importer of record, which is usually your distributor. See why a European company cannot be its own importer in Mexico, because the two facts have the same root cause.

What that means when the relationship ends

Suppose the distributor is not working out. You have the commercial right to terminate, and Mexico gives them no statutory indemnity, which we cover in ending a distributor agreement in Mexico. So far so straightforward.

Then the practical position asserts itself. Your new distributor cannot import until the products are certified in their name. Depending on the product family and the applicable NOM, that is a testing and certification cycle measured in months, and the cost is per product family rather than per company. During that window you cannot ship. Your old distributor still can, and still holds inventory.

That gap is worth real money to them and it is the reason a distributor who senses a change coming will slow-walk anything that would shorten it.

What you can do about it

Ask, before signing, who will be named on the certificate. If the answer is the distributor, you know your switching cost from day one and you can price it.

Try to hold it yourself. This requires a Mexican legal person of your own, which means an entity. That is the strongest reason we see for a European company to incorporate in Mexico earlier than the revenue alone would justify, and it is discussed in do you need a Mexican company to sell in Mexico.

Write a transfer obligation into the contract. Better than nothing, and weaker than it sounds, because the certification body is not a party to your contract and the process is administrative rather than contractual. A cooperative distributor makes it work. An uncooperative one makes you litigate while your goods sit.

Check which fractions are actually caught. NOM compliance is enforced at import for tariff fractions listed in an acuerdo issued by the Secretaria de Economia. Some products are caught, many are not, and the list is by fraction rather than by product description. Confirm your own fraction before you assume you have a problem, and before you assume you do not.

How long this actually takes

The honest answer is that it depends on the product family and the applicable standard, and that nobody should give you a single number. What is reliably true is the shape of it.

Certification is sequential and each step has a queue. Samples have to reach an accredited laboratory in Mexico. Testing takes as long as the standard requires, which for electrical safety and electromagnetic compatibility is not a same-week exercise. The certification body then reviews and issues. If the testing throws up a non-conformity, you correct and retest, and the queue restarts.

Two consequences for planning. First, start the conversation with a certification body before you appoint a distributor, not after, because the answer changes what you need from the distributor. Second, do not put the certificate on the critical path of a delivery commitment you have already made. The most expensive version of this problem is a signed order with a delivery date and an uncertified product.

If your product line has many variants, ask early how the standard treats families. Certifying a family rather than each SKU individually is sometimes possible and materially cheaper, and the answer is product specific.

Common questions

Is CE marking accepted in Mexico?

No, not as a substitute for NOM certification. Mexican conformity assessment under the Ley de Infraestructura de la Calidad relies on accredited Mexican bodies and laboratories. EU test data can support the process but does not replace it, and there is no automatic recognition of a CE declaration of conformity.

Can a foreign company hold a NOM certificate?

In the normal case, no. The certificate is issued to a Mexican legal person, which is why it usually sits with the importer of record. A European company that wants to hold its own certificates needs a Mexican entity.

Can a NOM certificate be transferred to a new importer?

Not as a simple assignment. Changing the party who imports generally means the products are certified again in the new party's name, which is a fresh certification cycle. Contractual transfer obligations help only where the outgoing distributor cooperates.

Which products need NOM certification to enter Mexico?

Compliance is enforced at the border for tariff fractions listed by the Secretaria de Economia, so the test is your fraction rather than your product category. Electrical goods, many consumer products, and prepackaged food and drink are commonly caught. Check the fraction before quoting.