How to Register Your e.firma for MVE on VUCEM

What is e.firma and why do you need it for MVE?

The e.firma (also known as FIEL — Firma Electrónica Avanzada) is Mexico's official electronic signature issued by the SAT (Tax Administration Service). Once the MVE becomes mandatory for their customs regime — the transition period ends October 31, 2026, and definitive imports follow on January 15, 2027 — every importer filing goods into Mexico must submit a Manifestación de Valor en Aduana (MVE) signed with their own e.firma. Your customs broker cannot sign on your behalf — the importer must sign directly.

Step 1: Obtain your e.firma from SAT

If your company does not yet have a Mexican e.firma, the legal representative must request an appointment at any SAT office in Mexico. Required documents include: official ID of the legal representative, proof of tax domicile, company incorporation documents (translated and apostilled if foreign), and proof of RFC registration. The appointment typically takes 30-60 minutes.

Step 2: Access the VUCEM portal

Navigate to ventanillaunica.gob.mx and select Ingreso con e.firma. Upload your .cer file and .key file, then enter your e.firma password. The portal will authenticate your identity and display your company information. Verify that your RFC, company name, and tax domicile are correct.

Step 3: Navigate to MVE (Manifestación de Valor)

Once logged in, go to Trámites → Comercio Exterior → Manifestación de Valor. If this is your first time, VUCEM may ask you to confirm your importer profile and accept the terms of service. The MVE module will show your filing history (empty if new) and the option to create a new MVE.

Step 4: Verify your permissions

Ensure your e.firma has the correct permissions to sign MVE documents. The VUCEM portal displays your available modules on the left sidebar. If MVE is not visible, your e.firma may need updating — contact SAT support to verify your digital certificate has the 'Comercio Exterior' scope enabled.

1. Keep your .cer and .key files in a secure location — never share them via email.
2. Your e.firma password is case-sensitive and required every time you sign an MVE.
3. The e.firma expires every 4 years — check the expiration date on your certificate.
4. If your legal representative changes, you must obtain a new e.firma with the new representative's biometrics.

Simplify with Camtom

Instead of navigating VUCEM manually, you can use Camtom's MVE module to prepare your MVE with pre-filled data from your import documents. Camtom validates every field before submission, reducing errors by 95%. You still sign with your e.firma, but the process takes minutes instead of an hour.