Nowadays ICT has a significant role in public administration by creating opportunities to automate a lot of manual operations. ICT plays an important role both in improving customer service in public administrations, as well as internal and inter-institutional co-operation processes in public administrations that promote access to services and service quality, facilitate administrative processes for citizens and businesses and contribute to the accessibility of information. Public authority daily faces a major challenge – on the one hand to reduce labour costs and on the other hand to introduce innovations. In the implementation of both these objectives public administrations deal with a serious problem – to operate in a connected environment by involving stakeholders and at the same time to solve problems by using new working methods, tools and management models. One of the strategic objectives of tax and customs administrations is to increase resource use efficiency and effectiveness, therefore they continuously search solutions how to simplify administrative procedures, how to improve and develop the quality of services provided and the business environment in general, and how to automate internal work processes and significantly reduce manual workload. This study aims to examine the structure affecting the efficiency indicators, to point out the factors which have the biggest impact on increasing the effectiveness of institutions.