Imagine the Mexican Tax Administration Service (SAT) asks you to prove, within hours, that an import you made three months ago was completely legal. Could you gather the 25 or 30 documents that support that transaction right now, without having to sift through your email, your customs broker’s system, and half a dozen shared folders?
That’s essentially the reason the electronic file exists: a regulatory requirement that obliges every importer in Mexico to maintain, for each customs declaration, a complete and organized digital package of the documentation that supports the transaction.
To solve precisely this problem, we launched a new product: the digital electronic file, a feature designed so you can view, organize, and download all the documentation for each customs declaration from a single location, without having to reconstruct it from your email, ERP, or your customs broker’s system every time you need it.
In this article, you’ll find out exactly what the electronic file is, what documents it typically includes, why so many companies maintain it in a fragmented way (and the risks that entails), and what best practices help keep it organized. Here’s what’s essential:
Key points
The electronic file groups, by customs declaration, the documents that prove an import.
It can include between 25 and 30 documents depending on the transaction.
Keeping it disorganized increases the risk during a SAT (Mexican Tax Administration Service) audit.
What is the electronic file and what does the regulation require?
The electronic file is, in short, the digital package of documents that supports a foreign trade transaction. Mexican regulations require importers to keep it complete, organized, and available for each customs declaration they process.
It’s not a single document, but a collection: commercial invoice, customs declaration, bill of lading (when applicable), certificates, permits, and several other documents that, together, prove that the merchandise entered the country legally.
How many documents are in a typical file?
A file can include between 25 and 30 documents, depending on the type of transaction, the merchandise, and the applicable regulations. Regulated goods, with sanitary permits or certificates of origin, tend to have more documents than a simple import.
Important: The exact number varies per customs declaration. There is no single list valid for all operations: each file depends on the merchandise, the customs regime, and the non-tariff regulations applicable to that particular shipment.
Why keeping it organized is harder than it seems
In practice, most companies don’t have a single location where this documentation resides. Documents end up scattered across email, the customs broker’s system, shared folders, the ERP, EDI files, supplier portals, and often, someone’s computer on the team. This fragmentation not only slows down daily operations but also greatly complicates an audit. If the Mexican Tax Administration Service (SAT) requests proof of legal possession of merchandise, reconstructing the complete file from half a dozen different systems, under time pressure, is exactly the scenario no company wants to face.
Important: An incomplete or poorly organized file doesn’t necessarily mean the transaction was irregular, but it does make it difficult to prove it in time. And in an audit, time is almost never on your side.
What happens when the file is incomplete?
During an inspection, the authorities may request the complete file for a customs declaration to verify the legal possession, origin, and destination of the goods. If you cannot gather the documents on time, or if key pieces are missing, you risk facing observations, additional requirements, and, in the most serious cases, having the entire transaction questioned.
The risk isn’t just related to documentation. It also affects your ability to respond quickly: the longer it takes to gather the evidence, the longer the process takes and the more complicated your situation becomes with the authorities.
Best practices for keeping your file up to date: Organizing the file by customs declaration, from the beginning, is the foundation of everything. Each transaction should have its own document container, without mixing them with others.
Centralize the documents in one place, instead of leaving them scattered among emails, ERP systems, and folders.
Record the date each document was received or attached, not just its content.
Verify the origin of each document (email, ERP, EDI, portal) so you can trace it later.
Regularly check that no documents are missing before the authorities request them, not after.
Keep a downloadable and organized copy of each file, ready to share in case of an audit.
Tip: It’s a good idea to review your files regularly, not just when an audit is scheduled. Finding a missing document with plenty of time is much easier than finding it under the pressure of an audit.