This paper covers the problems of Optimization and Software System Engineering for Insurance Group’s Acquisition Cost Allocation. This problem includes the research, development, and solution of several interrelated problems. It involves the formulation and investigation of the optimization model that describes the allocation of acquisition costs between different directions of insurance activity. The results of digital computer calculations for two types of insurance activity are also here presented. A parameter evaluation method with a tariff rate calculation technique is also presented in additional section. This section considers a more sophisticated model, the parameters of which are based on social statistics data for insurance usiness lines. Software Engineering for Insurance Group’s Acquisition Cost Allocation is also discussed in this paper.