Introduction
Activity-Based Costing (ABC) is a refined costing approach that allocates overheads and indirect costs to products, services, or processes based on the activities they consume. In decision-making, ABC gives managers clear insights into true cost drivers, enabling better pricing, product mix selection, and strategic decisions.
How ABC Works
ABC assigns costs through:
• Identifying key activities in the organization.
• Tracing overhead and indirect costs to these activities (e.g., machine setups, material handling).
• Allocating activity costs to products/services in proportion to their usage of these activities.
This method surpasses traditional costing by avoiding broad, arbitrary allocations and revealing actual profitability.
ABC in Managerial Decision Making
1. Product Profitability Analysis – ABC identifies high-cost and low-cost activities tied to products, helping managers focus on profitable lines. For example, a furniture maker may find custom tables consume more costly activities than standard chairs.
2. Improved Pricing Strategies – Detailed cost knowledge enables setting prices that reflect true resource consumption, improving competitiveness.
3. Cost Control and Reduction – ABC reveals high-cost processes, allowing targeted process improvements or outsourcing.
4. Make-or-Buy and Outsourcing Decisions – By clarifying the true internal cost structure, ABC helps compare in-house vs. outsourced production.
5. Customer & Segment Profitability – ABC shows which customers or segments drive costs and profits, guiding marketing and service levels.
Real-World Example
NewSerum Cosmetics used ABC to reassess the costing of lip serum and mascara. By splitting activities into purchasing and assembling, and using cost drivers like purchase orders and assembly hours, the company calculated more accurate product costs. This led to competitive pricing and better resource allocation.
In healthcare, hospitals use ABC to fairly allocate overheads such as electricity and equipment usage across procedures, leading to rational pricing and improved budgeting.
Steps to Implement ABC for Decision Making
1. Identify Activities – List all major production or service activities.
2. Assign Costs – Link direct and overhead costs to each activity.
3. Determine Cost Drivers – Select measurable factors representing resource consumption.
4. Allocate Costs – Use cost drivers to distribute activity costs to products/services.
5. Analyze Results – Interpret findings to guide strategic and operational decisions.
Relevant vs. Irrelevant Costs in ABC Decisions
Relevant Costs: Future costs that change depending on the decision. In ABC, these include variable costs tied to activities that vary with product or service levels.
Irrelevant Costs: Costs that do not change with the decision, such as sunk costs or fixed overheads that remain regardless of output.
Example: If outsourcing assembly, relevant costs might include assembly labor and materials, while the cost of already purchased machinery is irrelevant.
Benefits of ABC in Decision Making
• More accurate and actionable cost data.
• Clear insight into product, customer, and segment profitability.
• Stronger decision-making for pricing, product mix, outsourcing, and process improvements.
• Supports strategic planning with credible, detailed financial data.
Conclusion
Activity-Based Costing empowers managers to make smarter, evidence-based decisions by uncovering hidden cost drivers. When applied with a focus on relevant costs, ABC supports improved pricing, efficient cost control, optimized offerings, and strategic resource allocation.
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