Reform to the LFPCA: New deadlines, digital justice and strategic changes for tax and administrative litigation

Executive Summary:

• On June 9, 2026, the Decree amending, adding to, and repealing various provisions of the Federal Law of Administrative Litigation Procedure was published in the Official Gazette of the Federation. As a general rule, the reform entered into force on June 10, 2026, although it provides for a phased implementation for the operation of the hybrid case file and for various maximum time limits for proceedings.

• The central changes include the imposition of specific deadlines on the Federal Court of Administrative Justice, the expansion of the summary trial, the modification of the notification system through the Jurisdictional Bulletin, and the possibility for authorities and third parties to promote electronically even when the individual has chosen the traditional route.

• Likewise, the reform modifies strategic aspects of the defense: it eliminates the requirement of difficult repair for suspension, but incorporates new assumptions of impact on the social interest; it allows the authority to reinstate annulled acts even when certain expiration or prescription periods have elapsed; and it expands the admissibility of the tax review appeal in high-value matters.

• In operational terms, companies will need to anticipate the preparation of evidence, strengthen their notification and electronic file controls, and prioritize substantive challenge concepts, particularly in tax, customs and regulated sector litigation.

The Decree published on June 9, 2026, constitutes one of the most extensive modifications to the Federal Law of Administrative Litigation Procedure (“LFPCA”) since the consolidation of the Online Justice System. Its stated objectives are: (i) to expedite the resolution of disputes, (ii) deepen the digitization of the trial and (iii) to strengthen the effectiveness of the judgments of the Federal Court of Administrative Justice (“TFJA”).

However, the reform is not limited to reducing times or updating technological tools. It also (i) redistributes burdens and risks between individuals and authorities, (ii) modifies the strategic value of annulments due to formal defects, (iii) expands certain assumptions of tax review and (iv) It requires that the defense be structured from early stages with a solid evidentiary and digital record.

• STAGGERED ENTRY INTO FORCE

As a general rule, the reform came into effect on June 10, 2026. However, the transitional regime establishes two later dates relevant to the administration of pending cases and new trials.

On December 6, 2026, the second paragraph of Article 19 will enter into force, allowing the defendant authority or a third party to appear and file motions through the Online Justice System, even if the plaintiff has opted to pursue the case through traditional means. In turn, various provisions regarding maximum time limits for actions by the Court and the parties—including the new regime of Article 65 concerning notifications—will be applicable as of February 4, 2027.

Furthermore, tax reviews of certain rulings issued in the complaint proceedings will only be admissible for cases initiated after the general entry into force of the Decree. The temporal application of the reform must therefore be analyzed on a case-by-case basis, taking into account the date the case began, the procedural stage, and the specific provision in question.

• MANDATORY TIME LIMITS AND EXTENSION OF THE SUMMARY PROCEDURE

The reform incorporates explicit deadlines for actions that previously lacked a specific legal timeframe. Among other things, it establishes five days for agreeing to motions when the law does not stipulate a different deadline, as well as for admitting or dismissing claims, amendments, responses, and appearances once the corresponding preliminary requirements have been met. Similarly, deadlines are established for resolving procedural incidents, forwarding case files, and processing matters brought before the Superior Court.

These deadlines strengthen the possibility of demanding prompt administrative justice. However, failure to comply with them does not, in itself, result in a tacit decision or the automatic loss of jurisdiction of the court. Their practical effectiveness will depend on the oversight, accountability, and expedited justice mechanisms provided for in the Law itself.

Regarding the summary procedure, the threshold for admissibility is increased from fifteen to thirty times the Unit of Measurement and Update (UMA) per year. Resolutions issued by federal tax authorities in response to requests for refunds of taxes resulting from overpayments or payments made in error are also expressly included. The final judgment must be issued within a maximum period of six months from the date the claim is admitted, subject to suspensions arising from incidents, appeals, or other proceedings that prevent a resolution.

The expansion of the summary procedure can reduce the duration of minor and medium-value disputes; however, it also reduces the time available to obtain documents, prepare expert opinions, or gather technical information during the proceedings. Therefore, the claim must be filed with a practically complete theory of the case and evidentiary record.

• HYBRID CASE FILE AND NOTIFICATIONS VIA JURISDICTIONAL BULLETIN

The reform maintains the option for individuals to choose between traditional proceedings and online trials, but allows the court and third parties to use electronic means even within traditional trials. In such cases, the Federal Court of Administrative Justice (TFJA) must print and certify electronic filings and documents for inclusion in the physical case file, while service of process may be carried out through the system or digital tool provided by the Court.

When submitting digitized documents, the submitter must declare, under oath, whether they are originals, certified copies, or simple copies. Failure to do so will create a presumption, to the detriment of the submitter, that the document is a simple copy. The administrative file offered by the plaintiff is excluded from this procedure and must be physically presented to the corresponding registry office.

Regarding notifications, publication in the Jurisdictional Bulletin will continue to be the act that perfects notification, regardless of whether the electronic notification is actually received. Once the amendment to Article 65 takes effect, the notification will take effect on the second business day following publication, instead of the third business day stipulated in the previous system. This reduction in the reaction time makes it essential to maintain daily and independent monitoring of the Bulletin, without relying exclusively on email notifications.

• NEW BALANCE ON SUSPENSION

The reform repeals the requirement to prove that the execution of the challenged act could cause irreparable harm or damage. This amendment eliminates one of the traditional burdens for obtaining a stay and, in principle, broadens access to provisional relief.

However, two scenarios are included in which the suspension will be considered to affect the social interest or contravene public order provisions: when it allows activities or services that require a federal permit, authorization or concession to continue without them, or when it allows conduct that constitutes an infraction or crime under applicable law to be carried out or continued.

The effect of these provisions will be especially relevant for companies operating in regulated sectors. In such cases, the request for suspension must precisely define its effects and demonstrate that the measure only preserves the subject matter of the lawsuit, without replacing a non-existent authorization or allowing the continuation of unlawful conduct. It is expected that the application of these categories will generate jurisdictional criteria regarding situations in which the validity, renewal, or scope of the authorization itself is part of the dispute.

• EFFECTS OF NULLITY AND COMPLIANCE WITH JUDGMENTS

One of the most strategically impactful changes concerns the reinstatement of actions annulled due to procedural or formal defects. The authority will have four months to reinstate the procedure and issue a new resolution—or one month in summary proceedings—even if, in tax matters, the time limits established in Articles 46-A, 50, or 67 of the Federal Tax Code have expired. In matters other than tax law, the same rule will apply even if the statute of limitations or prescription periods established in the applicable legislation have expired.

This modification reduces the possibility that a formal annulment could, simply through the passage of time, become a definitively favorable ruling for the individual. Although the authority remains obligated to respect the effects of the judgment and cannot repeat the declared defect, it will be necessary to strengthen the substantive grounds for appeal and expressly request the analysis of those that could yield the greatest benefit.

As a counterbalance, the reform strengthens mechanisms for enforcing court rulings, shortens various procedural deadlines, and allows for fines ranging from three hundred to one thousand times the Unit of Measurement and Update (UMA) to be imposed on authorities responsible for unjustified non-compliance. The new system aims to expedite enforcement, although some decisions issued at the complaint stage may be challenged through a tax review.

• TAX REVIEW AND CUSTOMS LITIGATION APPEAL

The reform significantly modifies the tax review process. The general threshold for amounts in dispute is set at twenty-seven thousand times the Unit of Measurement and Update in effect at the time of the resolution or judgment. This increase may reduce the admissibility of the appeal in lower-value disputes, but it broadens the grounds for challenging the authority in matters of greater economic significance.

Specifically, the review of judgments declaring nullity due to procedural or formal defects is permitted in tax and foreign trade cases as provided by law, provided the corresponding monetary requirement is met. Likewise, certain resolutions issued at the complaint stage are included, and the National Customs Agency of Mexico and its administrative units are expressly recognized as authorities with standing to file appeals in matters within their jurisdiction.

In practice, a favorable ruling based solely on procedural violations may cease to be final in high-value disputes. In the customs arena, the explicit incorporation of the Mexican National Customs Agency reinforces the need to build a technically sound case file from the outset in matters of tariff classification, customs valuation, origin of goods, and non-tariff regulations and restrictions.

• PRACTICAL IMPLICATIONS FOR COMPANIES

Implementing the reform requires reviewing internal litigation and procedural monitoring protocols. In particular, the following measures should be considered:

• Classify matters according to the rules of immediate and deferred validity, and establish coordinated monitoring of the Jurisdictional Bulletin, as well as the physical and electronic files.
• Prepare in advance of the lawsuit the necessary reports, certifications, translations and other evidentiary elements, particularly in summary proceedings.
• Strengthen access controls to the e.signature, preservation of acknowledgments, integrity of files and traceability of promotions and digital attachments.
• Design specific suspension requests and structure from the beginning concepts of substantive challenge, considering the possibility of a tax review in high-value matters or in customs matters.

In summary, the reform represents a turning point for tax and administrative litigation in Mexico. While it expedites processes and deepens digitalization, it redistributes procedural burdens and reduces the value of annulments due to procedural defects. Therefore, its proper implementation will require advance evidentiary preparation, continuous monitoring of electronic notifications, and integrated management of physical and digital case files.