Analyzing the extrapolation of national interests into financial-legal mechanisms, the article identifies two groups of legal dilemmas: general system-related and sectoral, in particular, financial-legal. Among the general legal issues, there are problems of genesis, predetermination, formalization and species differentiation, as well as the prioritization and hierarchy of national interests, the lack of systematization of sources of their legal regulation, and the definition of their place and role in the legal system and the mechanism of legal regulation. Among the problems of using the concept of national interests in financial and legal regulation and law enforcement activities, the article examines the relationship between formalized and informalized national interests, the determination of the priority of certain national interests enshrined in strategic planning acts for the purpose of their material support, the dynamics, transformation and determination of the duration of the life cycle of national interests, the relationship between public and private financing for their support and implementation and the determination of legal forms of financing using positive obligations in financial-legal regulation, while respecting the principle of budget efficiency and limiting the discretionary powers of government bodies