Administrative reforms are significant organizational-institutional, cultural and functional innovations that can be traditional, market, minimizing and modernization. Modernization reforms aim to introduce measures to increase flexibility and speed up the entire administrative system. Given that traditional reforms no longer correspond to the needs of modern times, and that minimizing and market reforms bring great and numerous risks, continental European countries are mostly turning towards the modernization of public administration. Public administration is a set of administrative organizations that perform public affairs. Jobs that are performed in the interest of the local, regional or national political community are public jobs and as such are determined by a regulation of a local, regional or national nature. State administration is an integral part of the broader concept of public administration, which includes state administration, local and regional self-government (territorial self-government) and public services whose common goal is to satisfy public needs and general interests. The Tax Administration is a unique and independent administrative organization within the Ministry whose basic task is the application and supervision of changes in the regulations on the collection of contributions and tax regulations. It operates under the name Ministry of Finance, Tax Administration. The modernization of the Tax Administration is essential in order to strengthen the effectiveness, efficiency, transparency and responsibility of the Tax Administration in order to prevent the possibility of tax evasion. Unique portal of the Tax Administration (eTax - JPPU) is the central place where taxpayers can access the electronic services of the Tax Administration according to the One-Step-Shop principle. Services available include submitting forms and requests, receiving documents, managing taxpayer information and many others. The goal of e-Tax is to facilitate, accelerate and simplify the fulfillment of obligations towards the Tax Administration and to ensure that taxpayers are informed about their rights and obligations. Submitting tax returns and forms electronically would replace the obligation to manually fill out paper returns and forms and submit them to the competent offices of the Tax Administration, which will reduce costs for taxpayers, while increasing the efficiency of the work of the Tax Administration. The e-Citizens system was established by the Government of the Republic of Croatia with the aim of modernizing, speeding up and simplifying communication between citizens and the public sector, as well as increasing the transparency of the provision of public services. The e-Citizens system offers numerous services available to all citizens. The number of services is increasing over time, and thus the number of users of services via the Internet is also increasing. The public administration tries to provide users with as many services as possible through the e-Citizens system, because this saves time and money of citizens, as well as the public administration. It is important to note that special attention is paid to data protection and security features in the use of services via the Internet.