eSignature Legality in Mexico

E-Signature Legality Summary

This guide explains the electronic-signature framework in Mexico, including the governing laws, legal effect, accepted signature methods, validity requirements, exclusions and practical business uses.

Applicable Laws

Federal Commerce Code and the Advanced Electronic Signature Law

Legal Status

Electronic records and signatures receive legal recognition in Mexico under Federal Commerce Code and the Advanced Electronic Signature Law. The signing process must also satisfy every document-specific rule on identity, evidence, delivery, retention, witnessing, notarization, registration or filing.

Regulatory Authority

The competent regulators are the Tax Administration Service (SAT), which is responsible for digital certificates, and the Ministry of Economy (Secretaría de Economía).

Legal Recognition (Effect)

Electronic signatures are fully legally recognized and enforceable in Mexico under Articles 89 to 109 of the Commercial Code, which was amended in 2003 to include provisions on electronic commerce.

Mexico's electronic signature legislation is aligned with the UNCITRAL Model Law on Electronic Commerce.

This law aligns with international standards such as the UNCITRAL Model Law on Electronic Commerce, ensuring that eSignatures hold the same legal weight as handwritten signatures when they meet authenticity and integrity requirements.

These laws have been further strengthened in recent years to accommodate the increasing adoption of digital transactions, especially after 2020, when remote work and digital contracts became more common.

Accepted Types of Electronic Signatures

It is a basic form of eSignature that demonstrates consent but lacks strong identity verification. FES is suitable for low-risk agreements where minimal verification is needed.

Examples:

• Typed name in an email

• Scanned handwritten signature

• Clicking “I accept” on a digital contract

• Legal status: Recognized but may require additional evidence in case of disputes.

• Advanced electronic signature (firma electrónica avanzada - FEA)

It is a highly secure digital signature that uses encryption and is uniquely linked to the signer. Advanced electronic signature is governed by the Advanced Electronic Signature Law (LFEA) and the Commercial Code.

FEA is recommended for contracts that require a high level of security, such as financial, tax, or government-related transactions.

Requirements:

• Must be uniquely linked to the signer
• Must allow identity verification
• Must be created using certified digital certificates issued by an accredited authority (e.g., Tax Administration Service (SAT))
• Legal status: Carries the same presumption of authenticity as a handwritten signature and is stronger in court.

Legal Requirements for Electronic Signatures

For eSignatures to be legal in Mexico, they must meet the following requirements:

• Consent of all parties: All parties must agree to use eSignatures for the transaction.

• Attributability: The eSignature must be uniquely linked to the signer and allow their identification.

• Document integrity: The signed document must remain unaltered after signing to ensure authenticity.

• Legal recognition of the signature type: The signature must comply with either simple electronic signature (FES) or advanced electronic signature (FEA) requirements under Mexican law.

• Use of certified digital certificates (for FEA): Advanced electronic signatures must be generated using digital certificates issued by an accredited authority, such as the Tax Administration Service (SAT).

• Compliance with governing laws: The eSignature must meet the requirements set by the Commercial Code (Código de Comercio) and the Advanced Electronic Signature Law (LFEA).

Limitations and Exceptions

In Mexico, eSignatures are not valid for the following documents:

Real estate transactions: Documents related to property transfers, mortgages, and real estate sales often require wet ink signatures and notarization.

Wills and inheritance documents: eSignatures are not valid for wills, as they must be signed in person before a notary or other authorized official.

Marriage documents: Marriage documents require physical signatures and notarization.

Notarized documents: Any contract or legal document that requires a notary public's certification must be signed in person.

Certain government filings: Some official documents, such as those related to civil registries, may require physical signatures or notarization.

Industry Applications and Typical Use Cases

Industry:Banking and financial

Reason for using eSignatures:To speed up customer onboarding and ensure secure transactions

Common use cases

• Loan agreements
• Account opening
• Investment forms

Industry:Real estate

Reason for using eSignatures:To facilitate faster contract processing (excluding property deeds)

Common use cases

• Lease agreements
• Rental contracts
• Service agreements

Industry:Legal services

Reason for using eSignatures:To reduce paperwork and improve efficiency in contract execution

Common use cases

• NDAs
• Employment contracts
• Service agreements

Industry:Healthcare

Reason for using eSignatures:To digitize patient consent and streamline administrative processes

Common use cases

• Patient consent forms
• Insurance claims
• Telemedicine approvals

Industry:Government

Reason for using eSignatures:To enable secure online services and streamline compliance

Common use cases

• Tax filings
• Business registrations
• Procurement contracts

Industry:Human resources

Reason for using eSignatures:To simplify employee onboarding and document management

Common use cases

• Employment contracts
• Payroll authorizations
• Remote work agreements

Industry:eCommerce and retail

Reason for using eSignatures:To ensure quick and seamless online transactions

Common use cases

• Supplier contracts
• Order confirmations
• Refund approvals

Industry:Manufacturing and logistics

Reason for using eSignatures:To optimize supply chain agreements and improve efficiency

Common use cases

• Supplier agreements
• Shipping authorizations
• Purchase orders