Article L3133-13 of the French Public procurement code
Late payment shall give rise, under the conditions set out in this sub-section, to interest on arrears, a fixed indemnity and, where applicable, additional compensation paid to the creditor by the contracting authority.From the day following the expiry of the payment period or the due date set out in the concession contract, late payment shall give rise, ipso jure and without further formality, to interest on arrears, the rate of…