In the context of the digital economy small Russian companies with several settlement accounts, minimal currency risks, and the absence of the need to control credit resources and investments, practically do not create an autonomous treasury department. Treasury functions are performed by an accountant and are controlled and managed by a chief financial officer. With the expansion of the company’s activities, in order to create a unified strategy for the policy in the field of cash flow control and the development of financial risk management procedures, a centralized treasury is formed. According to research by the largest international audit companies, due to the strengthening of strategic emphasis in cash management, the role, degree of centralization, and importance of corporate treasury in Russian financial management have been growing significantly over the past 10 years. The study examines the development of the corporate treasury in leasing companies in Russia; the authors propose several ways of managing corporate treasury operations in leasing companies, in particular, development and application of a cash flow management system, and outline a methodology of separate accounting of the results of corporate treasury activities. It is concluded that the use of information support, based on big data analysis and machine learning, contributing to the consolidation of all the company’s cash flows in a single database, is required. In this regard, the results obtained can be useful to organizations that use corporate treasury in their activities.