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On June 2, 2026, Mexico's tax authority (SAT) moved the mandatory start date for the Manifestación de Valor Electrónica (MVE), Mexico's electronic value declaration, for the third time. The obligation that was set to bind every importer of record on June 1 now binds on August 1, 2026, with the transition window running through July 31. The change comes through the Primera Versión Anticipada de la Segunda Resolución de Modificaciones a las RGCE 2026 (Reglas Generales de Comercio Exterior, Mexico's general foreign-trade rules), published on the SAT portal on June 2, 2026, which reforms the Transitorio Décimo Primero.
Read that as a calendar change, not a reprieve. The legal basis never moved. Article 59, fracción III of the Ley Aduanera has always placed the value declaration on the importer. What the 2026 reform did was make that obligation electronic, attributable, and signed with your own e.firma, not your broker's. The prórroga bought 60 more days. It did not soften a single requirement behind the signature.
An operation that reads the extra two months as permission to wait is the operation that will meet August 1 the way the unprepared met every prior deadline: transmission by rejected transmission. Here is what actually changed, what did not, and the sequence to run before the clock runs out.
What the prórroga changed, and what it left untouched
The Segunda Resolución reforms one thing: the date. The Formato E2 (the electronic value declaration form in Anexo 1 of the RGCE), the per-invoice value detail, the e.firma signature, and the supporting expediente are all exactly as they were. The coexistence period that let importers keep filing the old paper "hoja de cálculo" simply runs longer, to July 31. From August 1, the electronic transmission is the only path.
There is a second reason the date matters less than the readiness behind it. The relief from penalties for inexact data that shielded importers during the transition disappears the moment the scheme is fully in force. A careless declaration filed in August is not a learning experience. It is an exposure.
The four obligations that bind on August 1
The substance reduces to four concrete responsibilities, each one a line of accountability on the importer's side.
The Manifestación de Valor is electronic and mandatory. It transmits through the single-window platform using the Formato E2, before contributions are paid. There is no parallel paper option after July 31.
The importer signs, the broker does not. The MVE is transmitted and signed with the importer's e.firma (or a Certificado de Sello Digital enabled for the platform). Under Regla 1.5.1 of the RGCE, the legal authorship of the value declaration is the importer's. The e.firma makes that authorship explicit and traceable to a single responsible party.
Value detail is per-invoice, through COVE, not aggregated totals. The information ties to each commercial invoice via the COVE (Comprobante de Valor Electrónico, the electronic value record). Only one valuation method may be declared per COVE, the one of greatest monetary impact, and the incrementables and decrementables (the additions and deductions to value such as freight, insurance, royalties, and commissions) must be detailed against the applicable INCOTERM.
The file behind the declaration has to survive a value review. The MVE is the visible tip of an electronic expediente. The supporting documentation (invoice, contract, transport document, and the rest specified in Article 81 of the Reglamento de la Ley Aduanera) must back both the declared value and the chosen valuation method, and be kept in digital form for five years under Article 30 of the CFF (Código Fiscal de la Federación, the federal tax code).
Four obligations, one direction: the value declaration stopped being paperwork the broker handles and became a signed obligation the importer owns.
The platform under your MVE also changed
While the MVE deadline moved, the ground it stands on shifted too. The Decreto published in the Diario Oficial de la Federación (DOF, Mexico's federal gazette) on May 4, 2026, in force the following day, enables the Ventanilla Única de Trámites de Comercio Exterior (VUTCE) as the single channel through which Mexico's foreign-trade authorities (Secretaría de Economía, SAT, and ANAM) receive and resolve trade procedures. The VUTCE is administered by the Agencia de Transformación Digital y Telecomunicaciones (ATDT), not the SAT, and it introduces the Expediente Único de Comercio Exterior, a single digital file consultable by all three authorities.
For the operator, the practical reading is straightforward. The VUCEM remains the technical infrastructure during the migration, so transmissions continue to flow, but the institutional model around your value file is now built for interoperability and traceability across three authorities at once. Your MVE no longer lands in a SAT-administered window. It lands in a shared, cross-authority record.
Why this lands on the Trade Director's desk, not the broker's
Here is the part most operations underestimate. The MVE looks like a procedural change. It is an organizational one.
When the signature on the value declaration is the importer's e.firma, the work of getting that declaration right can no longer live entirely with the broker. Someone inside your organization has to own the valuation logic, the per-COVE method selection, the incrementable detail, and the expediente that backs it. That someone is the Trade Director or the Operations Manager, not the customs broker who used to hold the pen.
In our work across more than 190,000 customs operations a year at 39+ ports on both sides of the border, the value declarations that survive a review are almost never the ones assembled at the moment of clearance. They are the ones where the importer's team had already decided how value is built, method, adjustments, and supporting documents, before the cargo moved. The signature only formalizes a discipline that was already in place. Where that discipline does not exist, the e.firma simply attaches a responsible name to a file that will not hold.
If no one in your organization can say today whose e.firma signs your MVE and where the per-COVE value file lives, that is the gap to close before August. A Manifestación de Valor readiness review, run against your last several operations before a value review does it for you, is exactly the kind of check a Joffroy expert can walk through with your team.
The sequence to run before August 1
The first weeks of mandatory transmission are where reprocesos (rejected transmissions and re-filings that stall clearance) accumulate. The 60 days the prórroga just handed you are the window to verify the chain end to end, in order, so that nothing has to be improvised in August.
→ Confirm the signature. Make sure the e.firma (or platform-enabled Certificado de Sello Digital) that will sign your MVE is active, current, and held by someone authorized to declare value. An expired or wrong-holder e.firma stops the transmission before anything else matters.
→ Map your scope. Confirm which operations require an MVE per operation and which fall under a facilidad. OEA-certified companies (Operador Económico Autorizado) and holders of automotive depósito fiscal authorization transmit only on requirement, not on every operation. Knowing your scope tells you where the daily burden actually falls.
→ Build the value file at COVE level. For each commercial invoice, fix the single valuation method of greatest monetary impact and detail the incrementables and decrementables against the INCOTERM. This is the work that used to be improvised at the border. Under the MVE it has to be structured before transmission.
→ Close the loop to the pedimento. The folio generated on transmission must be declared on the pedimento in Registro 507 with the ED identifier, before payment of contributions. A transmitted MVE that never reaches the pedimento is an electronic inconsistency waiting to be flagged.
→ Lock the expediente. Assemble the supporting documents per Article 81 of the Reglamento de la Ley Aduanera and set the five-year digital retention now, not when an audit asks for it.
Each link is small. A broken one is a held shipment.
Where transmission discipline becomes an operational advantage
The MVE rewards operations that treat value as a maintained system rather than a clearance-day scramble. That is a process and technology question as much as a compliance one: a transmission that lands clean every time, a value file built per-COVE before the cargo moves, and an audit trail that can reconstruct any declaration on demand. It is the layer our own platforms, JoffroyOS and TradeShield, are built to enforce, and the layer 122 years at this border have taught us matters most at the moment a declaration is finally tested.
From August 1, the signature on your value declaration is yours, transmitted through a platform that did not exist in its current form eight weeks ago. The prórroga did not give you a pause. It gave you preparation time. The only question that matters is whether you spend it building the file, or spend August learning what was missing from it.
TRADE. UNDER CONTROL.
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