Compulsory Third-Party Liability Insurance and Unjust Enrichment: The Insurer's Right to Reimbursement for Inexcusable Error (Order No. 16213/2025)

The Italian legal landscape is constantly evolving, and rulings by the Court of Cassation play a fundamental role in guiding the interpretation of laws. Order No. 16213 of June 17, 2025, from the Third Civil Section, presided over by Judge D. F. and reported by Judge M. R., offers significant clarification on compulsory third-party liability (RCA) insurance and, in particular, on the insurer's right to recover sums paid in error, even if inexcusable. This decision, which quashed and remanded a previous judgment by the Court of Appeal of Venice dated January 24, 2022, is of great interest to industry professionals and citizens, as it delineates the boundaries of the application of unjust enrichment and legal subrogation.

The Case: A Fatal Accident and an Error in Assessment

The legal proceedings originated from a fatal road accident. Specifically, the carrier's insurer, Company Z., had compensated the family members of a third-party passenger, even though it was not obligated to do so. The vehicle that caused the accident was, in fact, uninsured, a circumstance that should have led to the involvement of the entity designated by the Guarantee Fund for Victims of Road Accidents (in this case, Company G.). Insurer Z.'s error consisted in considering Article 141 of the Private Insurance Code (Legislative Decree 209/2005) applicable to fatal accidents, a full eight years after its entry into force, despite established case law and legal scholarship having already clarified the precise scope of the provision. Faced with this "inexcusable error," the question arose whether the insurer who had paid unduly could seek recovery of the sums.

Unjust Enrichment and Legal Subrogation: The Role of Article 2036 of the Civil Code

In resolving the issue, the Court of Cassation relied on Article 2036, paragraph 3, of the Civil Code, which governs unjust enrichment. This provision states that whoever has paid another's debt, believing themselves to be the debtor due to a excusable error, may recover what they have paid, provided that the creditor has not in good faith divested themselves of the title or guarantees of the debt. The peculiarity of the ruling lies in extending this possibility even to "inexcusable" errors, qualifying the action as a form of legal subrogation. Article 2036 of the Civil Code, in conjunction with Article 1203 of the Civil Code (on legal subrogation), allows whoever pays another's debt to step into the creditor's rights, even if the payment was made due to an error that is not easily justifiable. This principle aims to prevent unjust enrichment, ensuring that the party truly responsible for the damage bears the associated economic burden.

The compulsory third-party liability insurer who, due to an inexcusable error, indemnifies the injured third party, even without being obliged to do so, may demand reimbursement of the amount paid from the insurer of the sole responsible party, pursuant to Article 2036, paragraph 3, of the Civil Code. (In this case, the Supreme Court attributed to an instance of subrogation under Article 2036, paragraph 3, of the Civil Code the claim for reimbursement brought against the entity designated by the Road Victims Fund by the carrier's insurer, which, in relation to a fatal accident caused by the driver of an uninsured vehicle, had compensated the family members of the third-party passenger even though it was not obligated to do so, due to an inexcusable error consisting in considering Article 141 of the Insurance Code applicable to fatal accidents, eight years after its entry into force, despite the accumulation of copious scholarly production to the contrary).

The maxim of the Supreme Court is extremely clear and important. It states that even if an RCA insurer makes a serious error – an "inexcusable error" – in paying compensation that was not due, they still have the right to seek reimbursement from the insurer of the party actually responsible. This means that the error, however evident or easily avoidable, must not result in an unfair benefit for the true debtor. In the specific case, insurer Z. had misinterpreted Article 141 of the Insurance Code, considering it applicable to fatal accidents despite a now-established contrary judicial interpretation. Despite the gravity of this oversight, the Cassation Court recognized its right to recover the sums paid from Company G., designated for the Road Victims Fund, which was the party actually liable for compensation. This reinforces the principle that the economic burden of compensation must fall on the party actually responsible, thereby preventing unjust enrichment and promoting greater fairness in the insurance system.

Implications and Key Points of the Decision

This ruling by the Court of Cassation is fundamental for several reasons:

• **Overcoming the concept of "excusable error":** The Court extends the possibility of recovery even in the face of an inexcusable error, provided that the payment was made for another's debt.
• **Strengthening of legal subrogation:** The function of Article 2036, paragraph 3, of the Civil Code as a mechanism for legal subrogation is reaffirmed, allowing the paying insurer to step into the rights of the injured party against the true responsible party.
• **Protection against unjust enrichment:** The decision aims to prevent a party (the responsible party's insurer or the Road Victims Fund) from benefiting from an undue payment, thereby discharging their own obligation.
• **Relevance for the Road Victims Fund:** The ruling clarifies that even in complex contexts such as those involving the Fund, the principles of recovery of undue payments and subrogation remain valid.

Conclusions

Order No. 16213/2025 of the Court of Cassation represents an important milestone in insurance and civil liability law. It emphasizes how, even in the presence of a significant error by an insurer, the Italian legal system provides mechanisms to rebalance positions and ensure that the economic burden falls on the party actually liable for compensation. This decision not only offers greater certainty to industry operators but also strengthens the principle of substantive justice by preventing undue enrichment and ensuring the correct allocation of responsibilities. For insurers, it serves as a warning to be accurate, but also as a guarantee regarding the possibility of recovery in complex situations. For the injured parties, it reiterates that the correct identification of the responsible party is always fundamental for fair and timely compensation.