My thesis describes the analysis of the Tax Office crisis communication with the users during the COVID-19 pandemic. The main goal is the analysis of the Tax Office communication in the period from the beginning of the corona crisis in March 2020 when the Tax Office started to function under different rules, until March 2021. Since the Tax Office almost entirely transferred its functioning online, the main crisis communication has also been transferred online. The analysis has been carried out through the form „write to us“, which is part of the virtual tax advisor and a tool of receiving requests. In order to perform the best quality communication analysis, we have analysed a number of requests for all Tax Offices with emphasis on 2020, analysis through e-Tax system from March 2020 to March 2021, analysis of eTax within eCitizens system from 2017 until beginning of May 2021 and analysis of the Tax Office website, the Covid crisis announcements. We will implement an inquiry to clarify the reasons for the use of eTax application, to establish whether the corona crisis has been an incentive and which kind of service is preferred by the users. The goal of the empirical research was to establish the communication quality through the electronic system in the Covid crisis and general satisfaction of the users with eTax service. It has also been important to establish whether the Tax Office has been successful in adjusting its services faced with corona crisis and earthquake challenges. The thesis will, besides analysis, try to tackle the issue using the professional references. I will explain the terminology of the communications, crisis, public relations, communication in the times of crisis, main goal, vision and mission, Tax Office communication strategy and eTax application.