Introduction: the article presents the results of a critical analysis of the current state of theory and legislation on the legal regimes of banking. Objectives: to build a competitive legal framework for the operation of Russian credit institutions in ordinary and extraordinary legal regimes; to increase the availability of banking services in the Republic of Crimea and the federal city of Sevastopol; to develop the theory of legal regimes of entrepreneurial activities and banking. Methods: the methodological framework of this study is a set of scientific methods where the main ones are the methods of analysis, synthesis, generalization, induction and deduction, classification, interpretation, historical, comparative, statistical methods, logical methods of determining the scope and content of concepts; interpretation of law. Results: the author offers ideas contributing to the emerging doctrine of legal regimes of entrepreneurial activities in general and banking in particular: the paper provides arguments in favor of abandoning the category ‘general legal regime of entrepreneurial activities’; it substantiates the differentiation of legal regimes based on their legal properties into ordinary and extraordinary, with their further differentiation by business areas (or business entities), objectives and the initiator of introducing, regime quality completeness, voluntary or compulsory involvement of business entities, the impact on the business legal capacity, the territory of the legal regime and its validity. There are made numerous proposals aiming to improve the regulatory windows of the basic legal regime of banking and superstructural legal regimes – experimental, sanction and high-alert regimes. Conclusions: the theory of banking legal regimes has not yet been developed, which prevents creating an appropriate, efficient legislative system; active theoretical conceptualization and legislative improvement of all banking legal regimes are required.