Relevance of the research topic. In modern conditions, the system of public finance is an important tool for regulating socio-economic processes, intensification of the economy. Important factors that affect the quality of the public finance system are financial and economic risks due to the trend of economic development. Accordingly, the assessment of financial and economic risks is an important condition for the development of sound financial and budgetary policy, the development of institutional support for the stability of public finances and economic security of the country as a whole. Formulation of the problem. Based on the trends of economic development of both countries with transformational and developed economies, in modern conditions, important tasks are: substantiation of strategic objectives of fiscal policy to increase the level of stability of public finance and its components; mutual coordination of decisions of public administration bodies. At the same time, the development of institutional support for the sustainability of the public finance system should be carried out taking into account globalization processes. Analysis of recent research and publications. The issue of developing institutional support for the sustainability of the public finance system is quite common in research. These are the works of famous domestic and foreign scientists: J. Keynes, P. Samuelson, J. Stiglitz, V. Tanzi, O. Vasylyk, I. Zapatrina, S. Kucherenko, L. Lysyak, L. Levaeva, I. Lukyanenko, M. Pasichny, A. Sokolovska, I. Chugunov and others. Highlighting unexplored parts of a common problem. Selection of unexplored parts of the general problem. The above issues are relevant in connection with the spread of acute respiratory disease COVID-19, which affected the trend of economic development, led to a violation of the budget balance, which requires a number of specific tasks related to the development of institutional sustainability of public finances and its components. Goal setting, research goals. The objectives of the study are: to reveal the role of public finance in the regulation of socio-economic processes; substantiate the features of economic security and its components; to analyze and evaluate the indicators of financial security of Ukraine. The purpose of the study is to reveal the directions of fiscal policy to ensure the sustainability of public finance. Research method or methodology. The article uses a set of research methods: a systematic approach, statistical analysis, structuring, synthesis, etc. Basic material presentation. The role of the public finance system in the regulation of socio-economic processes is revealed. The peculiarities of economic security and its components are substantiated. The analysis and assessment of financial security indicators of Ukraine is carried out. The directions of financial and budgetary policy on ensuring the stability of the public finance system are revealed. Area of application of results. The results of the study can be used in the process of reforming the public finance system. Conclusions according to article. In order to increase the stability of the public finance system, at this stage of socio-economic development of the country, it is advisable to: substantiate sustainability indicators – the basis of a transparent system of continuous monitoring of public finance system development and its components; introduction of effective management financial and budgetary tools – systematic assessment of the state of financial and budgetary security; improving the efficiency of financial and budgetary policy in the field of ensuring the stability of the public finance system and political responsibility for its results.