Activity Based Costing — common mistakes

In an exam question, you will often be given a table of activities and potential cost drivers. Your first task is to logically link each activity to its most appropriate cost driver. For example, 'Production scheduling' costs are driven by the 'number of production runs', not the 'number of units produced'.

When asked to 'advise' or 'recommend' whether a business should adopt ABC, you must provide a balanced argument. Discuss both the potential benefits (like more accurate pricing for their specific situation) and the significant costs and complexity of implementation. Conclude with a justified recommendation.

Generally, yes, because it uses multiple factors to allocate overheads that are more closely linked to what causes those costs. However, its accuracy depends on correctly identifying activities and their cost drivers. If these are chosen poorly, the results can still be misleading. For very simple businesses with low overheads, traditional costing might be 'accurate enough' and more cost-effective.

A business is most likely to benefit from ABC when it has high levels of overhead costs, produces a diverse range of products (some high-volume, some low-volume), and has complex production processes. In these situations, traditional costing is likely to distort product costs significantly, and the more accurate information from ABC can lead to much better strategic decisions.

Absolutely. Service industries also have overheads and activities. For example, a bank can use ABC to determine the cost of different services like processing a loan application, opening an account, or providing financial advice. The activities might be 'customer interviews' or 'credit checks', and the cost drivers could be 'number of applications' or 'hours of advice given'.