Mexico: A Dispute Resolution: Monterrey Overview

Dispute Resolution in Monterrey: Procedural Modernisation Amidst Judicial Uncertainty

Monterrey on the eve of a dual transition

Dispute resolution in Monterrey is approaching two successive transformations. Mexico’s National Code of Civil and Family Procedure (the “National Code”) must enter into force nationwide no later than 1 April 2027, while the federal and local judicial positions not renewed in 2025 are scheduled to be filled by popular vote in 2028.

For companies operating in Nuevo León, these reforms offer the prospect of more uniform procedural rules, but they also create a period of uncertainty. Businesses and litigants will have to adapt to a new procedural framework while the courts responsible for interpreting it prepare for a later change in their composition and governance.

A new national framework for civil and commercial litigation

The National Code was enacted in 2023 to replace the different civil and family procedural codes applied by Mexico’s federal and state courts. It may enter into force gradually through legislative declarations; in their absence, its application will become automatic nationwide on 1 April 2027.

In Nuevo León, the state’s Code of Civil Procedure will cease to govern new civil and family proceedings. Pending cases will continue under the legislation in force when they were initiated, unless all parties jointly agree to adopt the new rules. Local courts will therefore administer two systems for several years. The transitional rules also prevent consolidation of proceedings where one is governed by the National Code and another by an abrogated code.

The reform also extends beyond civil and family litigation. Article 1054 of the Commercial Code provides that the National Code and the local Code of Civil Procedure (in that order) will apply supplementarily when commercial legislation does not regulate a procedural issue. In Nuevo León, this amendment will become operative when the National Code enters into force. In commercial cases, it will replace both the Federal Code of Civil Procedure and the local Code, as the principal supplementary source.

The national framework may reduce regional differences and make litigation strategy more consistent across Mexico. It also strengthens oral proceedings, judicial case management and digital tools. Its success, however, will depend on adequate budgets, trained personnel, compatible technology and predictable interpretations. Early disputes are likely to concern service of process, evidence, interim relief, appeals and enforcement.

Amparo proceeding as an early testing ground

The National Code is already producing judicial interpretation. Since 13 March 2025, Article 2 of the Amparo Law has adopted it as the supplementary procedural legislation for amparo proceedings.

Federal courts differed on whether this reference depended on a formal declaration of entry into force. In 2026, a regional plenary court held that supplementary application in amparo proceedings was immediate and was not conditional on such a declaration. Amparo proceedings have therefore become an early testing ground for questions that civil and commercial courts may encounter in 2027, including conflicts between new supplementary rules, special legislation and completed procedural stages.

Judicial reform: lessons from the 2025 election

The procedural transition is taking place against the backdrop of Mexico’s judicial reform. In 2025, Mexico held its first election for federal judges and magistrates, together with local judicial elections in 19 states. Nuevo León did not elect its local judiciary. Its current judges and magistrates were appointed under the previous system: the state Constitution still provides for magistrates to be designated by Congress from a shortlist and for first-instance judges to be appointed through the Local Judicial Council.

Mexico’s first nationwide judicial election exposed serious weaknesses. The Organization of American States’ (OAS) observation mission reported turnout of approximately 13% and identified limited public knowledge, insufficiently harmonised evaluation methods, compressed periods for reviewing applications, complex ballot papers and allegations that co-ordinated (and illegal) voting guides, known as acordeones, had been distributed to steer voters. These circumstances raised doubts as to whether the results consistently reflected an informed assessment of professional merit.

Those concerns were reinforced by the outcome. The OAS mission observed that the nine Supreme Court candidates who received the highest number of votes had been promoted through physical or virtual acordeones; six were nominated by the Executive Branch’s evaluation committee, while the remaining three were sitting justices originally appointed by former President López Obrador. The mission considered that combination sufficient to raise reasonable doubts about the Court’s autonomy and independence from the Executive. Although these circumstances do not establish bias in any particular case, they raise legitimate concerns about institutional independence and impartiality, which may erode confidence in judicial decisions, reduce predictability for litigants and ultimately impair the administration of justice.

These concerns have direct consequences for commercial disputes. Judicial legitimacy depends not only on the selection method but also on independence, technical competence, experience and consistent application of the law. Replacing experienced judges without rigorous merit-based safeguards may reduce specialisation and increase variability, especially in complex commercial, financial, insurance and cross-border matters. Popular election may also create incentives difficult to reconcile with adjudication insulated from political or public pressure.

The road to the 2028 judicial election

In June 2026, a constitutional amendment postponed until 2028 the election of positions not renewed in 2025. Federal and local judicial elections will now coincide on the first Sunday of June 2028. Nuevo León must therefore harmonise its Constitution and legislation and complete its transition to an elected judiciary.

The amendment addressed several deficiencies. It created a co-ordinating commission for the three federal evaluation committees, required standardised methodologies and knowledge examinations, and directed each committee to identify the four best-evaluated candidates before a public lottery reduces the list to two. Similar principles will apply locally, together with first-year performance evaluation and continuing training.

These are relevant improvements, but they do not eliminate the principal concerns. The reform preserves the participation of the political branches in nominations and the use of lotteries in the final selection of candidates. It does not require a prior judicial career or materially increase the constitutional thresholds for professional experience. Accordingly, the 2028 process may improve candidate screening without fully resolving the risks to judicial independence, specialisation and continuity.

What businesses and litigants should expect

The postponement creates a narrow implementation window. Nuevo León’s existing judiciary should oversee the National Code’s initial application in 2027, but the courts may undergo a substantial personnel and governance transition in 2028. This could preserve institutional knowledge during the Code’s first year, although some experience may subsequently be lost.

Businesses should not wait to adapt. Contracts should be reviewed to confirm whether jurisdiction, arbitration and mediation clauses remain appropriate. Internal protocols should ensure early preservation of contracts, accounting records and electronic communications. Litigation assessments should consider the effects on interim measures, expert evidence, enforcement and recognition of foreign decisions.

Monterrey’s businesses are being asked to trust a new procedural code and, soon after, a reconstituted bench to apply it. Neither element of that equation is fully within their control. What is within their control is preparation: reviewing dispute-resolution clauses now, before 2027 forces the question, rather than after the first contested case exposes a gap that nobody noticed in time.