The topic of this paper is the implementation of e-invoices in the educational system. In order for the public sector institution to perform its work more efficiently, and for it to provide a better quality of public services, and to increase global competitiveness, it is important to invest knowledge and skills in the development of innovations. Business process innovation ranges from small attempts at business process improvement to digitalization, to automation and business redesign. The paper emphasizes the importance of electronic business, especially the electronic invoice as the most widespread electronic document, which plays a central role in the development of electronic business. Electronic business is a business which encompasses business transactions and communicative technologies of enterprises, between enterprises and customers, and between enterprises and public administration. It also sets out the basic rules outlined for the electronic invoice, in particular those contained in the Law on Electronic Invoicing in Public Procurement (NN 94/18) and Directives 2006/112/EZ and 2014/55 /EU. An information broker is a legal entity that, in accordance with the European norm, performs the electronic invoice exchange between the issuer and the recipient of the e-invoice. The paper presents the implementation of the e-Invoice system in education in the example of ''Nikola Tesla'' Primary School. The establishment implemented the e-Invoice system through Fina as the information intermediary. But that system is closely linked with the existing accounting system. The e-Archive system has completely taken over the institution's existing accounting information system.