In modern conditions, economic security is one of the main elements of enterprise management, and to ensure it, it is very important to have reliable information about the activities of an economic entity. Moreover, accounting and information systems (accounting, tax accounting, management accounting) are the basis for planning, analysis and control of the company's activities. The importance and usefulness of information lies in the fact that it brings benefits to the entrepreneur and is used in decision-making to obtain effective results. This article discusses the problem of improving the accounting and information system of accounting, tax and management accounting to ensure the economic security of enterprises, which is one of the key in the modern world. The relationship between the three main information systems used in the activities of the entity, presented in the form of the scheme, which also demonstrates the whole process of obtaining information (starting from data collection to synthesis and recognition), they need to make competent management decisions. How complete, reliable and high-quality accounting information will be depends, first of all, on the results of a comprehensive analysis of the company's economic activities, which will serve as the beginning for making certain management decisions. The role of information in business is great and timely detection and elimination of threats to the economic security of the organization depends on it. This article discusses modern types of unfair actions that lead to a violation of economic security of an economic entity, and also identifies methods that affect their elimination. Thus, increasing information content within the framework of observing the economic security of the enterprise will contribute to the development of the enterprise as a whole. Based on the theoretical part and in the course of reasoning, the main aspects of this problem were identified, and measures aimed at eliminating it in the organization were determined