The article analyzes the theoretical and methodological foundations of overhead cost allocation. The stages of primary and secondary allocation and their significance in determining product cost and substantiating managerial decisions are examined. Based on the principles of cause-and-effect, fairness, consistency, and efficiency, the criteria for optimal cost allocation are identified. Furthermore, the necessity of implementing multi-criteria and adaptive allocation models in modern production conditions is emphasized. The research findings enhance the accuracy of product costing, improve the assessment of resource utilization efficiency, and expand the opportunities for substantiating managerial decisions.