Mexico
Regime overview
In Mexico, Article 17 of the Federal Constitution governs class actions, with implementing provisions set forth in the Federal Code of Civil Procedure and the Federal Law on Consumer Protection. Federal judges exercise exclusive jurisdiction over these matters.
The procedural framework imposes exceptionally compressed and peremptory deadlines. Defendants, for example, must file their opposition to certification within five business days of service. Similarly, once the court grants leave to proceed, defendants have fifteen days to answer the complaint—a period the judge may extend for an additional fifteen days upon request. This represents the only extension available under the framework. The truncated timelines demand that defendants must try to prepare their strategies well in advance, as the narrow procedural windows leave little or no room for delay. Companies should adopt this proactive approach, particularly when facing parallel class actions in other jurisdictions based on analogous claims.
There exist three types of actions:
First, “Diffuse Actions” protect the indivisible rights of an undefined collective. These actions aim for general reparation rather than individual monetary compensation. They do not require a common legal connection to the defendant or a minimum number of members. Second, “Strict Sense Actions” safeguard the rights of a group comprising at least 30 identified or identifiable individuals. These actions require a common legal bond and permit compensation for individual damages. Third, “Homogeneous Individual Actions” protect the contractual rights of at least 30 individuals with similar claims. These actions require a "common origin" and aim to secure individual indemnities.
Rules for commonality of claims/class certification
In Mexico, class actions require "common elements of fact and law," meaning the cause of the damages must be uniform across the entire class, with any differences among members being secondary. In product liability cases, proving a "design defect" is generally easier than a "manufacturing defect," as the latter pertains to individual products and complicates the commonality argument. A strict interpretation of this requirement can undermine procedural efficiency and potentially render litigation unfeasible.
After the complaint is filed, the judge orders service of process on the defendant, granting them five days to present arguments opposing class action certification. The judge then evaluates several key requirements, including whether the acts impact consumers or the environment, the presence of commonality, the existence of at least 30 class members (depending on the type of class action), adherence to the statute of limitations, and whether the matter is free from res judicata, among other factors.
Class member participation (opt-in/opt-out)
Mexico has an “opt-in” model, requiring the express consent of collective members to participate. For Strict Sense and Homogeneous Individual actions, at least 30 members must join to initiate the process. This active membership requirement, which obligates plaintiffs to identify and document class members, poses a significant logistical challenge. Unlike the “opt-out” model, which automatically includes all potential claimants, the opt-in approach restricts the size of mass claims and may deter large-scale litigation.
Right to Appeal
A judgment in a class action is appealable, and its enforcement is suspended until the Court of Appeals issues a decision. This can substantially extend the duration of the judicial process. Additionally, aggrieved parties may challenge the appellate judgment by filing a constitutional claim (“amparo”).
Litigation Funding
Third-party litigation funding is gaining traction in Mexico as a means to offset high litigation costs. The absence of specific regulations governing this practice offers significant flexibility.
What's new across Mexico's key sectors
Life Sciences & Health Care
"Life sciences companies should prepare for more unpredictable treatment of clinical trial disputes, consumer protection claims, and access-to-medicine litigation."
Consumer
"Consumer companies should prepare for increased unpredictability in how consumer rights are interpreted and enforced."
Automotive
"Mexico has enacted and implemented a judicial reform, transitioning to a system where judges are elected by popular vote... this could result in a more politicized climate around safety, emissions, and consumer protection issues, as courts may be swayed by public opinion."
Financial Institutions
"Building resilient compliance frameworks and preparing for uneven enforcement will be critical to navigating [the 2026] environment."
Technology
"[Tech] companies should anticipate uneven interpretations of regulatory frameworks and invest in adaptive, cross-border compliance planning."
Connect with us
Luis Enrique Graham
Partner Mexico City
Orlando Cabrera
Senior Associate Mexico City
Juan Aguirre
Associate Mexico City
