Glossary term
Activity-Based Costing
Activity-based costing assigns indirect costs to products, services, or customers based on the activities that consume resources.
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What Is Activity-Based Costing?
Activity-based costing, or ABC, is a managerial accounting method that assigns indirect costs to products, services, customers, or channels based on the activities that consume resources. It is designed to show what things actually cost when overhead is driven by complexity, not just volume.
Traditional costing might spread overhead using one broad measure, such as labor hours. ABC breaks overhead into activities such as setups, inspections, purchase orders, engineering changes, customer support, or deliveries, then assigns those costs using activity drivers.
Key Takeaways
- Activity-based costing traces overhead through activities and cost drivers.
- It can reveal that low-volume or complex products cost more than traditional costing suggests.
- ABC is mainly a management tool, not a required external reporting format.
- The quality of the result depends on choosing meaningful cost pools and drivers.
- The method is most useful when overhead is large and product or customer complexity varies.
How ABC Works
A basic ABC model follows a chain: resources support activities, activities consume cost, and cost objects use activities. The company identifies activity cost pools, selects drivers for those pools, calculates driver rates, and assigns costs to products or services based on actual or expected driver usage.
For example, two products may use the same direct materials but require very different setup time. A traditional system may treat them similarly. ABC can show that the product requiring more setups, inspections, or engineering support is more expensive to serve.
Simple Formula
Activity Driver Rate=Activity Cost PoolTotal Driver Units
If the annual setup cost pool is $300,000 and the company expects 1,000 setups, the setup driver rate is $300 per setup. A product requiring 40 setups would receive $12,000 of setup-related overhead.
What ABC Helps Managers See
ABC can improve pricing, product-line decisions, outsourcing analysis, process improvement, and customer profitability work. It often shows that the most visible cost is not always the most important cost. A customer with high revenue but frequent custom requests may be less profitable than a smaller customer with standard orders.
Limits
ABC can become expensive to maintain if the model has too many activities or if activity data are hard to collect. It also depends on judgment. The driver should have a real cause-and-effect relationship with the cost pool, not merely be easy to measure.
The Bottom Line
Activity-based costing helps managers understand the real cost of complexity. It is strongest when overhead matters, operations vary, and better cost visibility can change pricing, process, or product decisions.