This article provides a comprehensive analysis of the structure of the budget system and expenditures of the Republic of Kazakhstan (ROK), which are characterized by complexity and multilevel and reflect the amount of financial resources and the size of budget constraints at the levels of the budget system. The main focus is on the republican budget, which generates the country's revenues and finances national expenditures directed to such areas as defense, national security, foreign policy, as well as projects and assistance programs. The functioning of the budget system is regulated by regulatory legal acts (NPAs), including the Constitution of the Republic of Kazakhstan, the Budget Code of the Republic of Kazakhstan and other NPAs, which ensures transparent and effective management of public finances. The Ministry of Finance of the Republic of Kazakhstan plays a key role in the implementation of the state financial policy, coordinating work with other ministries and departments.The article presents the results of the analysis conducted by the author of this article of the execution of republican budgets for the period 2018-2022. It is shown that all three categories of budgets (republican, regional and local) demonstrate steady growth in spending, which can lead to increased public investment and expansion of government programs. Special attention is paid to the increased level of education and health care, which ensures the priority and higher level of efficiency of these sectors in comparison with other sectors of the economy of the Republic of Kazakhstan. Based on the analysis, a SWOT analysis was conducted, which revealed the strengths and weaknesses of the budget system of the Republic of Kazakhstan, as well as identified threats and opportunities to improve its condition.The article concludes with recommendations on ensuring the sustainability of the budget system and improving the efficiency of budget funds, including measures to increase transparency and efficiency of budget processes, optimize budget allocation, improve the effectiveness of social programs, reduce public debt, develop interdepartmental experience and use the state experience achieved in a number of sectors and territories.