The analysis of publishing activity on the formation and implementation of local budgets in terms of ensuring their financial self-sufficiency has shown an increase in recent scientific interest in this issue, which indicates its relevance. This interest is especially important in the context of decentralization budget reforms in recent years. Thus, the purpose of this study is to analyze the self-sufficiency of local budgets in terms of decentralization reforms of the budget system and new conditions for the formation of the revenue side of local budgets. In the process of performing the tasks of the work the methods of economic, system and comparative analysis and synthesis were used. The analysis of statistical data on the indicators of the revenue side of local budgets was carried out using calculation-analytical, graphical methods. The paper analyzes the main definitions of the concept of financial self-sufficiency, and determines that most of them are based on the resource approach and assume the availability of sufficient financial resources to meet the economic and social needs of the region. Amendments to the Budget Code provide for the redistribution of tax revenues in favor of local budgets in terms of personal income tax, excise tax, income tax and other taxes. The analysis of the structure of the consolidated budget of Sumy region showed that the key source of formation of its revenue part is the receipt of funds from the personal income tax and local taxes. At the same time, revenues from these sources have increased significantly in recent years, primarily due to the growth of the minimum wage, as well as the intensification of entrepreneurial activity. The analysis of the volumes of local taxes and fees by cities of oblast subordination showed that the largest volumes of revenues are brought by the single tax and payment for land. As an indicator of the level of financial self-sufficiency of local budgets, it is proposed to use the share of own revenues in the total amount of budget revenues. According to which indicator a comparative analysis of the consolidated budgets of Sumy, Kharkiv and Poltava regions was conducted and it was determined that Kharkiv region has the highest level of financial self-sufficiency.