Organizational changes for the purpose of enterprise development, as a topic of scientific research, are especially relevant for Ukraine now, when organizations need systematic and continuous development, which in most cases depends on how the process of transforming the structural configuration will take place in the process of implementing the enterprise's strategy, if it is the transformation of the configuration necessary due to a change in the level of influence of the main characteristics of the external environment. In turn, the fact of achieving the goal of transformation cannot be considered without determining the effect of this process.
 The need for theoretical substantiation of the transformation’s effect of the organization as an economic category arose long before the appearance of most modern methods of building organizational structures and methods of mathematical statistics. At the current level of understanding the transformation process, new models of organizational construction are important. Therefore, this article considers the application of mathematical statistics methods in the context of determining the effect of enterprise transformation in case of organizational changes.
 The work proposes to consider the possibility of determining the effect of the transformation process by mathematical modelling for enterprises occupying a monopoly position on the market of goods and services in the case of fixing the sale price of products by state regulators and for organizations belonging to the market structures of imperfect and perfect competition, unregulated monopoly and oligopolies.
 It is proved that the expansion of the break-even zone of the enterprise after the transformation of the organizational form configuration, which is determined by the ratio of the functional dependencies of the cost and income parts over time, can be considered as an indicator of the effect on the transformation process of the enterprise.
 It is the indicator of the transformation process effect, which is characterized by a change towards the expansion of the break-even zone, that should be used in various cases of transformational changes, in particular, in case of existing restrictions on the total volume of sales of the company's products while optimizing the growth of production costs.