This paper explores the application of the Activity-Based Costing (ABC) model for NIB, a leading Australian health insurer. The ABC model helps identify and allocate costs to specific activities, providing a more accurate understanding of cost drivers and enabling NIB to optimize its operations and enhance profitability. The paper analyzes NIB's mission, vision, and business strategy, highlighting how the ABC model can align with these objectives. It also discusses the benefits of implementing the ABC model, including improved cost visibility, enhanced decision-making, and increased efficiency. The paper concludes with recommendations for NIB to effectively implement the ABC model and leverage its potential for cost reduction and profit maximization.