The article analyzes the social request as a factor in the dynamic development of financial and legal regulation. The author addresses the category of “interest” considered in legal science as the initial driver of legal dynamics. Based on a theoretical and legal analysis, the derivation of the social request from social interest is substantiated, with the former interpreted as a conscious and externally expressed form of the latter. The socio-interactive nature of legal interests is examined, as well as various approaches to defining the public request. Using the examples of experimental legal regulation, participatory budgeting, and discussion of draft laws with the involvement of civil society institutions, three mechanisms of the social request’s influence on the dynamic development of public finances are identified. The author concludes that introducing the concept of “social request” into scientific circulation makes it possible to systematize disparate phenomena of feedback between society and the state, thereby expanding the existing doctrinal understanding of the factors influencing the transformation of financial and legal regulation.