Updated · By Buğra Sözeri
Is an electronic signature legal in Mexico?
Is an e-signature legal in Mexico?
Yes, for most contracts, under the Código de Comercio. Mexico's Código de Comercio states that information cannot be denied legal effect, validity or binding force solely because it is in a data message, and that a signature requirement is met by an electronic signature appropriate for the purpose.
Main exceptions: Acts that must be executed before a notary (fedatario público) under the applicable law; Acts with the federal public administration that require an advanced electronic signature (FEA); Documents where a specific law requires a particular signature form.
Our take: for commercial contracts in Mexico, a simple e-signature is legally workable, and the real question is proof. Article 1298-A tells courts to weigh how reliable your method was, so an audit trail, document hash and a completion certificate matter more than the signature image. For dealings with the SAT or federal agencies you need an e.firma, and notarial acts still need a notary. eSignSimple gives simple electronic signatures only and is not a NOM-151 certified conservation provider, so if your counterparty insists on NOM-151 timestamps, use a certified provider for that.
Which laws govern electronic signatures in Mexico?
Código de Comercio, Title II (electronic commerce, from art. 89)
Applies throughout Mexico in commercial matters and is based on technological neutrality and functional equivalence. Article 89 bis gives data messages legal effect and evidential value, Article 93 covers writing and signature requirements, and Article 97 defines when an electronic signature is advanced or reliable.
Ley de Firma Electrónica Avanzada (DOF 11 January 2012)
Governs the advanced electronic signature (FEA) in acts with the federal public administration. Under Article 7, documents with an FEA have the same effect and evidential value as those with a handwritten signature. Under Article 4 it does not apply to tax, customs and financial matters, and commercial acts follow the Código de Comercio.
How are signatures handled in Mexican commercial transactions?
Article 97 of the Código de Comercio says that where the law requires or the parties agree on a signature for a data message, the requirement is met by an electronic signature appropriate for the purpose for which the message was generated or communicated.
Article 93 adds that where the law requires the parties' signature, that requirement is satisfied for a data message as long as it can be attributed to them.
What is an advanced or reliable e-signature in Mexico?
Under Article 97, a signature is advanced or reliable if the signature creation data belongs exclusively to the signer, was under the signer's exclusive control at signing, and any change to the signature or to the data message after signing is detectable. Anyone can still prove reliability, or unreliability, by other means.
How do Mexican courts weigh electronic evidence?
Article 1205 lists data messages among admissible evidence, and Article 1298-A says that to weigh a data message the court will mainly consider the reliability of the method used to generate, store, communicate or keep it. An audit trail and document hash go directly to that question.
What about notarised acts and government dealings in Mexico?
Where the law requires an act to be executed before a notary (fedatario público), Article 93 lets the parties express the terms via data messages, but the notary's formalities still apply. Dealings with the federal public administration use the advanced electronic signature (FEA) under the Ley de Firma Electrónica Avanzada.
eSignSimple provides simple electronic signatures with an audit trail that records timestamps, IP addresses and a document hash. It does not issue qualified, advanced or certificate-based signatures, so where a law requires one of those you will need a licensed or accredited provider.
This page is general information about how electronic signature law works, not legal advice. For a specific high-value or regulated transaction, check with a qualified lawyer in the relevant jurisdiction.
Which documents need more than a simple e-signature in Mexico?
- Acts that must be executed before a notary (fedatario público) under the applicable law
- Acts with the federal public administration that require an advanced electronic signature (FEA)
- Documents where a specific law requires a particular signature form
Where can I read the official texts?
- Código de Comercio (Cámara de Diputados text, via gob.mx)
- Ley de Firma Electrónica Avanzada (Cámara de Diputados text, via IMPI)
- NOM-151-SCFI-2016 on conservation of data messages (Diario Oficial de la Federación)
This guide is general information, not legal advice. Laws change and details depend on your situation; consult a qualified lawyer in Mexico for specific transactions. eSignSimple provides simple electronic signatures with an audit trail; it does not issue qualified or certificate-based signatures.
Frequently asked questions
Does eSignSimple meet the requirements in Mexico?
For commercial contracts, eSignSimple provides a simple e-signature plus an audit trail and document hash, which goes to the reliability test in Article 1298-A. It is not an e.firma (FEA) and not a NOM-151 certified conservation provider, so do not use it for SAT or federal filings or notarial acts.
Is a simple e-signature valid for commercial contracts in Mexico?
Yes, if it is appropriate for the purpose and can be attributed to the signer (Código de Comercio arts. 93 and 97).
What is the FEA law for?
The Ley de Firma Electrónica Avanzada governs the advanced electronic signature in acts with the federal public administration and gives FEA-signed documents the same effect as handwritten ones in those dealings.
How do Mexican courts weigh electronic documents?
Article 1298-A of the Código de Comercio says the court mainly considers the reliability of the method used to create and keep the data message.
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