French Formal Payment Demand Letter (Mise en Demeure)

It is not always an absolute legal obligation, but it is strongly recommended and effectively unavoidable in practice. Most French recovery procedures — including the injonction de payer (court-issued payment order) and the simplified commissaire de justice route — require evidence of a prior unfulfilled demand. More importantly, it is the notice itself that starts the clock on late-payment interest under Article 1344-1 of the Code civil. Skipping it weakens your case and forfeits interest.

The letter must contain: full contact details of both creditor and debtor; the date; the invoice reference number and date; the exact outstanding amount; the legal basis (Article 1344 of the Code civil); a payment deadline (typically 8 to 15 days); the explicit phrase 'mise en demeure de payer' (without it, the document is merely a reminder, not a formal demand); and a clear warning that legal proceedings will follow if payment is not made.

French law sets no minimum deadline for an already-overdue debt, but professional practice and case law favour 8 to 15 days. A reasonable deadline strengthens the document's credibility before a judge. The deadline runs from the date the debtor receives the LRAR, which is why the signed delivery confirmation (*accusé de réception*) is so important — it establishes the precise starting point for both the deadline and any late-payment interest.

Yes. Article 1344-1 of the Code civil provides that a formal demand to pay a sum of money triggers statutory late-payment interest (intérêts moratoires au taux légal) from the date of receipt, with no need for the creditor to prove actual loss. In B2B transactions, contractual or statutory penalty clauses also apply, plus a fixed recovery indemnity of €40 (Article L441-10 III of the Code de commerce for the principle; Article D441-5 for the amount set by decree).

LRAR (*lettre recommandée avec accusé de réception*) is not an absolute legal requirement, but it is strongly advisable. It provides a dated, signed proof of receipt that (a) fixes the exact starting point of late-payment interest and the debtor's payment deadline, and (b) constitutes solid evidence in any subsequent court proceedings. Always keep a copy of the letter, the posting receipt, and the signed delivery confirmation.

You can escalate to a formal recovery procedure. For debts below €5,000, the procédure simplifiée de recouvrement (simplified recovery procedure) handled by a commissaire de justice (the French enforcement officer formerly known as a huissier) can produce an enforceable title without a court hearing, under Articles L125-1 to L125-3 of the Code des procédures civiles d'exécution (CPCE). For larger sums or disputed claims, the standard routes are the injonction de payer (payment order application) or a full court summons (*assignation*).