Today's operations in the growing and faster development of the digital economy require continuous monitoring of trends, modern technologies and modes of operation. Since a large number of processes try to digitize and minimize use of paper documents, working with e-invoices is one of the main innovations in the state administration of the Republic of Croatia. For each innovation intended to be introduced into everyday business processes a time of adjustment is taken in consideration and reasons are given for each innovation why it occurred. This paper presents the overall chronology of the introduction of e-invoices in the state administration, as well as the challenges encountered and the proposals of enhancements and improvements to follow. In today's conditions of growing and faster technology development, it is extremely important to use every innovation that increases quality and positively affects the entire system and everyday business processes. E-account is one of the most important innovations for the state administration of the Republic of Croatia. The Central State Office for Reconstruction and housing care of the Republic of Croatia was analyzed to present the example of the work with e-invoices.