Germany’s federal states implement EU Directive 2014/55/EU under their own responsibility. The requirements for electronic invoicing that apply to you as a supplier of public authorities and legal entities of the federal states are stipulated by the legal provisions of the federal state(s) in question. Here  you will find information on how e-invoicing is implemented by the various federal states in Germany. Further information can be found in the “federal states summary” (Ländersynopse)  of the Coordination Office for IT Standards (KoSIT). If you are uncertain about the legal situation, we recommend that you contact your customers directly in the relevant federal state administration.