When an insured person wrongly receives social security benefits, they must repay them in full, even if the error was made by the fund.
In a decision of 4 September 2025 the French Court of Cassation (Cour de cassation) confirmed that the court cannot reduce the repayment debt on the basis of the ordinary law. A special regime applies, to the detriment of fairness.
A special regime that excludes the ordinary law
In one case, an insured person had received daily sickness benefits twice over. The Judicial Court, while acknowledging that the sums had been unduly paid, had reduced the amount to be repaid, relying on Article 1302-3 of the French Civil Code, which allows the debt to be reduced where the creditor is at fault. On an appeal brought by the fund, the Court of Cassation quashed that decision: only Article L. 133-4-1 of the French Social Security Code applies, and it makes no provision for any adjustment. The ordinary courts therefore have no power to reduce the overpayment, even where the body is manifestly at fault.
A protective regime… for the body, not for the insured person
This decision is not new. It is part of a consistent line of case law confirming the existence of an autonomous legal regime for the repayment of social security overpayments. This regime benefits the social security system, which retains a strict right of recovery. And yet, in this case, the error was attributable to the fund, which had failed to exercise due care. For the insured person, who is often in a precarious situation, it is unrealistic to expect to repay sums that have already been spent. The ordinary law would have allowed the court to take these realities into account, but this lever has been ruled out.
An imbalance that raises questions
The decision reveals an imbalance: the public body has an unconditional right to repayment and is also authorised to impose a penalty in the event of fraud, whereas there is no equivalent the other way round. This asymmetry is all the more striking given that, in other branches of law, the fault of the solvens (the party who made the payment) can neutralise or limit restitution. Here, fairness is sacrificed in the name of financial rigour, even though the body’s fault may cause the insured person harm equivalent to the debt being claimed.
With social debt exceeding €290 billion, securing the payment of benefits is a crucial issue. But should this budgetary logic not be tempered when an insured person acting in good faith, who has not taken advantage of the system, finds themselves in debt through no fault of their own? The question remains open, but the answer of the law as it stands is clear: the ordinary courts can do nothing.