On September 22, 2026, Mexico published the Second Amendment to its 2026 General Foreign Trade Rules (RGCE) in the Diario Oficial de la Federación. The biggest change for importers: since October 1, 2026, the customs value declaration (Manifestación de Valor) must be filed electronically (MVE) through Mexico’s Digital Window (VUCEM), signed by the importer with their own e.firma. The paper format was allowed only through September 30.
Temporary relief through December 31, 2026
- Transport documents, origin documents and customs guarantee accounts do not need to be attached to the MVE.
- Contract details can be sent using Formato E15.
- Those attachments become mandatory again on January 1, 2027.
Other changes in the same resolution
Lifting an importer-registry suspension caused by an inaccurate NICO declaration is now a formal request (form 20/LA). Annexes 1, 2 and 22 were also amended.
What to do now
- Make sure your e.firma is current and that you can access the Digital Window.
- Agree with your customs broker on who prepares and who signs each MVE.
- Use the transition period to organize contracts and supporting documents before 2027.
On the U.S. side: if you ship copper wire or cable into the U.S., CBP has rejected entries that omit the country of smelt and country of cast since September 14, 2026 (CSMS 69711865).
Source: Diario Oficial de la Federación, September 22, 2026. This alert is for information; we confirm with you what applies to your shipments.
Does this change affect your shipments?
We will review with you how your imports work under the electronic MVE. Call us at +1 (956) 717-4150 or request a review.