Article 31 of the Code of Civil Procedure conditions the admissibility of any legal action on the demonstration of a legitimate interest in the success or rejection of a claim. Its wording, intentionally broad, leaves the judge with a margin of appreciation that has considerably refined in recent years, particularly in economic and property disputes.
Interest to act and business secrecy: the filter that practitioners underestimate
The control of the interest to act under Article 31 CPC is no longer limited to verifying that a claimant suffers personal harm. In disputes related to business secrecy, courts now articulate the legitimate interest of the claimant with the provisions of Articles L.151-1 and L.153-1 of the Commercial Code.
Specifically, when a party requests a measure of instruction in futuro (Article 145 CPC) to obtain documents covered by secrecy, the judge conducts a double examination. First, he verifies that the claimant justifies an interest to act in accordance with Article 31, and then assesses whether this interest is sufficiently characterized to justify an infringement of secrecy.
This mechanism, which is increasingly observed in commercial disputes, transforms the interest to act into a genuine preliminary filtering tool.
To understand Article 31 of the Code of Civil Procedure, one must therefore go beyond the isolated reading of the text and place it in its interaction with special evidence regimes.
Personal, direct, and current interest: the triptych revisited by jurisprudence
Article 31 CPC does not expressly mention the three classic characteristics of the interest to act. It is the courts that have established the requirement for a personal, direct, and current interest. The wording of the text (“legitimate interest”) allows the judge the latitude to assess each situation.
Enhanced control in partition actions
The litigation of judicial partition illustrates the tightening of control. The judge verifies that the claimant effectively justifies their status as a co-owner and that their interest in obtaining the partition is current, not merely potential. An heir whose rights are contested by a parallel action for the annulment of a will may face a lack of current interest.
We recommend documenting the status of co-owner from the outset, with supporting documents, rather than assuming this condition is met. Jurisprudence now more severely penalizes evidential shortcomings on this point.
Distinction between interest to act and standing to act
Article 31 CPC mixes two notions that practice regularly confuses. The first part of the text establishes the general principle of legitimate interest. The second part introduces a caveat: the law may reserve the right to act to certain qualified persons. This is the standing to act, a condition distinct from interest.
In corporate law, for example, an action for the annulment of a general assembly resolution requires not only an interest (the harm suffered) but also the status of a shareholder or an injured third party, depending on the case. The judge examines these two conditions separately, and inadmissibility can be pronounced on one without the other being discussed.
Article 31 CPC and the burden of proof: who must demonstrate the interest to act
The question of the burden of proof of the interest to act deserves particular attention. The principle is as follows: it is up to the defendant who raises the plea of inadmissibility based on lack of interest to provide proof. The claimant benefits from a presumption of interest as soon as they formulate a claim.
This distribution becomes more complicated in certain special litigations. When the law attributes the right to act to qualified persons (second part of Article 31), the claimant must demonstrate that they fall within the targeted category. The burden of proof then partially shifts.
- In common law, the defendant proves the lack of interest of the claimant to obtain the inadmissibility of the action
- In the case of designated actions (actions reserved by law for certain persons), the claimant must establish their standing to act from the initiation of the proceedings
- The judge may raise the lack of interest to act ex officio when it pertains to public order, which remains debated in doctrine
Plea of inadmissibility and Article 31: the procedural moment of control
The lack of interest to act constitutes a plea of inadmissibility within the meaning of Article 122 CPC. This qualification carries specific procedural consequences that practitioners must master.
The plea of inadmissibility can be raised at any stage of the proceedings, including for the first time on appeal. It does not need to be presented before any defense on the merits, unlike procedural exceptions. The judge can pronounce it without the parties having invoked it, subject to respect for the adversarial principle.
A technical point often overlooked: Article 126 CPC allows for the regularization of the plea of inadmissibility. If the lack of interest or standing disappears during the proceedings (for example, an heir who obtains confirmation of their inheritance rights), the inadmissibility will not be pronounced, provided that the regularization occurs before the judge rules.
- The plea of inadmissibility based on Article 31 can be invoked at any stage of the proceedings
- It differs from the procedural exception, which must be raised before any defense on the merits
- Regularization during the proceedings is possible if the defect has disappeared at the time the judge rules
Article 31 of the Code of Civil Procedure remains a pivotal text whose scope goes beyond mere formal verification. Its concrete application varies according to the type of dispute, the applicable evidential regime, and the procedural moment chosen to invoke the lack of interest. Neglecting these parameters exposes one to inadmissibilities that could have been avoided through rigorous analysis prior to the initiation of proceedings.
