Abstract. The paper studies the issues of compiling accounting forms for groups of economic entities (commercial organizations of the real sector, non-profit organizations of the real and public sector, organizations of the public sector), taking into account the peculiarities of disclosing information about the sources of financing of their activities for the purpose of external and internal control of the reliability of information. An assessment is made of the content of the current state of the regulatory framework for the preparation of financial statements by various groups of economic entities in terms of reflecting sources of financing in it, in order to control the reliability of information. The methodological basis of the work was the general scientific principles and methods of research: analysis and synthesis, logical linking, systematization. The author’s systematization of regulatory regulation in relation to the requirements for information on sources of financing disclosed in the balance sheet is presented, taking into account the characteristics of subjects of the commercial, public and public sectors of the economy, and a classification of their reporting forms is carried out. The shortcomings of the normative regulation of reporting were identified and proposals were developed for their elimination. The grouping of forms of financial statements depending on the groups of economic entities that have essentially different sources of financing activities is given. A critical assessment of the procedure for compiling the balance sheet and reflecting in it information about the sources of financing for the activities of non-profit organizations and public sector organizations is given. It is necessary to change the conceptual approaches to the disclosure of information about the source of funding for the activities of public sector organizations in order to strengthen external financial control. The proposed author’s approach to identifying sources of financing for the activities of various groups of economic entities, and reflecting information about this object in their balance sheet, can be implemented both in the process of improving legal regulation and in the process of reporting by economic entities, especially for public sector organizations. The main results obtained by the authors allow a professional accountant to adequately implement the requirements of federal standards regarding the reflection of information about sources of financing in the reports of economic entities of various groups and control the reliability of this information.