The short answer
A Mexican customs broker (agente aduanal) is an individual authorized by the Mexican state — through a license called a patente — to file customs clearance for goods on behalf of third parties. They translate your import into the language of customs: they classify the goods, determine what duties are owed, and file the pedimento, Mexico's customs declaration.
They are not your carrier, not your warehouse, and not your supplier. It is a specific legal role, with its own liability before the authority.
What they actually do
On a typical import, the customs broker handles:
- Classifying the goods. Assigning the tariff code that determines the duty owed, which non-tariff regulations apply, and whether the shipment qualifies for preferential treatment under a trade agreement.
- Determining customs value and calculating duties and taxes.
- Checking that documentation reconciles: invoice, packing list, transport document, certificates of origin, permits.
- Filing the pedimento — the document declaring the operation — and accompanying clearance, including physical inspection if the shipment is selected for review.
- Answering for what was declared. That last point is what just changed.
If you want to read what they file, we break it down in how to read a Mexican import pedimento.
What changed on January 1, 2026
The Customs Law reform was published in Mexico's Official Gazette on November 19, 2025 and took effect on January 1, 2026, with some staggered deadlines.
Worth saying up front, because plenty of content presents it as this week's news: this is not a new rule from August 2026. It has been in force since January.
Two changes matter for importers:
1. The broker's license is no longer for life. It used to be granted indefinitely. It now carries a 20-year term, renewable once for an equal period, subject to evaluation by the new Customs Council and to periodic certification.
2. The liability exemption was removed. This is the substantive change. Customs brokers — and customs agencies too — are now jointly liable alongside importers and exporters for the accuracy of declared data, correct tariff classification, and payment of duties. Previously there were scenarios where a broker could disclaim responsibility by pointing to data the importer supplied; those scenarios were narrowed.
(Verified against two independent sources that agree: the reform analyses by EY México and INCOMEX. We are not publishing anything here about changes to clearance without a broker, because the sources consulted do not detail it — ask a specialist directly about that.)
What it means for you in practice
A jointly liable broker will ask you for more and better information, and that is not bureaucracy: they are managing their own exposure.
Expect requests for technical sheets and product composition to support classification, backup for the declared value — the invoice and how that price was reached — and evidence the transaction is real: contracts, transfers, correspondence with the supplier. The materiality of the operation is now on the table.
If your customs broker got more demanding this year, that is why. And if they did not get more demanding, it is worth asking why not.
Where their job ends and ours begins
Worth being explicit here: Ecommex is not a customs broker or a customs agency. We hold no license, we do not classify goods, and we do not file pedimentos. Saying so avoids the wrong phone call.
The boundary is clean:
| The customs broker | The logistics operator |
|---|---|
| Classifies the goods | Receives goods once released |
| Calculates duties | Counts against invoice, flags shortages |
| Files the pedimento | Labels per the applicable standard |
| Attends the inspection | Stores and picks orders |
| Answers to customs | Answers for inventory and outbound |
You need both, and neither substitutes for the other. Their point of contact is the moment goods leave the customs facility: one process ends and the other begins. When that handoff is coordinated, inventory goes sellable the same day; when it is not, goods wait on this side after already waiting on the other.
On the figures people confuse with this — bonded facilities, fiscal deposit, general deposit warehouses — we separate them in recinto fiscal vs. recinto fiscalizado and in general deposit warehouse vs. 3PL.
Frequently asked questions
Do I need to be on the importer registry to hire a customs broker? The registry is a requirement to import, and it is your filing, not the broker's. Requirements are covered in Mexico's importer registry (padrón de importadores).
Are "agente aduanal" and "agencia aduanal" the same thing? No. The agente is the licensed individual; the agencia is the legal entity they may operate through. Under the reform, both are covered by joint liability.
What does a customs broker charge? Typically a fee per pedimento, sometimes a percentage of the transaction value, plus expenses advanced on your behalf. It varies by broker and by commodity; ask for the split between their fee and third-party costs.
Can I switch customs brokers? Yes, it is your decision and requires no one else's permission. What deserves care is the transition: make sure the new broker receives the classification history of your products, so the tariff code does not change criteria mid-year without a reason.
This article is informational and does not constitute customs or tax advice. For your specific case, consult your customs broker or a foreign trade specialist.
When your goods leave the customs facility, somebody has to receive them, count them, label them and make them sellable the same day. That is what we do: here is how our import services in Mexico work.