October 28, 2025
Mexico’s New Electronic Declaration Rule Could Cause Delays
Mexico will implement a major customs change on December 9, requiring importers to electronically submit a Manifestación de Valor Electrónica (Electronic Declaration of Value) through the Mexico’s Ventanilla Única de Comercio Exterior Mexicano portal before shipments can clear customs.
The new rule shifts documentation from a post-clearance record to a pre-clearance requirement, meaning shipments cannot enter Mexico until all supporting evidence such as invoices, freight charges, supplier contracts, and proof of payment is uploaded and approved.
These changes are due to high-profile fuel import fraud cases and aim to increase transparency and tax compliance. Each filing will require an importer’s secure electronic tax signature (e.firma) and the system changes could slow cross-border trade, increase operational costs, and cause delays at ports and border crossings.
To prepare for the December 9 deadline it is important to train teams and audit documentation to avoid any disruptions once the regulation takes effect.
For additional questions or assistance related to these new customs procedures, please reach out to your Mallory Alexander representative.
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