The article discusses the main elements of creating an ideal mathematical model of the operating procedure of the budget department for IT enterprises. The main technical problems arising in the context of deteriorating business conditions and economic instability are analyzed from the point of view of strategy. The introduction of information technology and the creation of specialized programs and modules are the primary methods for resolving the issues associated with the automation of business processes. By using such systems in various functional divisions, it is possible to reduce the amount of human factor and unneeded paperwork while also making the information gathered at the organization clear, accessible, and organized. Business process management modeling, which is a numerical optimization synthesis of the structure, components, and parameters of a business process, is incredibly important yet is still in its infancy. The cost of an IT project is the primary concern of the developed principles of mathematical modeling of business process management. The baseline data for the generated model, as well as its structure and the findings obtained, can alter dramatically throughout the simulation depending on the nature and peculiarities of each specific project. The research under discussion is aimed at increasing competitiveness in the market and maximizing the overall strategy of the organization. When constructing a mathematical model, the author pays special attention to the methods of mathematical modeling of a business process based on the principles of queuing theory. The created model will allow budget departments of IT companies to evaluate and improve their activities.