The agro-industrial complex of Russia has a complex structure of forms of management. The implemented principle of its multiplicity until recently included personal subsidiary farms, peasant (farmer) farms, sole proprietors and agricultural organizations as part of the forms of management of the agricultural sector of the economy. The situation has changed significantly since 2020. The backbone organizations of the agro-industrial complex were identified, including not only large agricultural organizations, but also the corresponding agricultural holdings. Since 2021, state support for private households has been provided. This required the allocation of a segment of institutionalized agricultural producers as self-employed from a variety of personal subsidiary farms. The discussion also continues about the need to divide personal subsidiary farms into commodity and non-commodity ones. All the above problems, institutional changes, as well as modern complex foreign economic conditions of the functioning of the economic entities of the domestic agro-industrial complex have determined the need to improve the methodology for modeling the effectiveness of business forms. The article discusses the legislative and regulatory norms that establish the criteria for classifying business entities in the agrarian sector to a certain category. These criteria did not form a unified system that allows evaluating various forms of management in a single methodological field. To solve this problem, the authors propose a system of criteria and their normative values (upper limit) for modeling and evaluating the effectiveness of business forms in the agro-industrial complex, with the calculation of the efficiency index based on them, which is a mathematical model of the effectiveness of the business form.