Costing Models: Advantages of Using Time-driven ABC Method over The Traditional ABC Method

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Time-Driven Activity Based Costing

Activity-based costing (ABC) is a costing method that is usually used as a supplement to a company’s usual costing system, and is therefore used for internal decision-making. It is designed to inform managers of costing information for decisions (strategic and others) that potentially affect capacity and consequently “fixed” as well as variable costs. In addition, ABC can also be used to pinpoint activities that would benefit from process improvements.

Traditional ABC problems

The traditional Activity-Based Costing is implemented using the following steps [1]:

Define activities, activity cost pools, and activity measures.

Assign overhead costs to activity cost pools.

Calculate activity rates.

Assign overhead costs to cost objects using the activity rates and activity measures.

Prepare management reports.

Implementing a traditional ABC system is a substantial project requiring a lot of resources. It works well in a smaller setting such as a single department, plant or location; however, it becomes quite cumbersome on a large scale for use on an ongoing basis. Once implemented, ABC is costly to maintain and update since it consists of data concerning many activity measures that are periodically collected, checked and entered into the system.

As a result, systems that are put in place for ABC are updated infrequently and the model’s estimates of process, product and customer costs soon become inaccurate. In addition, the complexity of actual operations tends to get overlooked by traditional ABC models.

Furthermore, estimated cost-driver rates in traditional ABC models are usually overstated, since cost driver rates are often calculated assuming that resources are ...

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... and cheaper to implement, but also much more accurate. The time-driven ABC approach therefore better allocate the costs to a given activity, customer, location or product. In addition, time-driven ABC allows for unused capacity to be identified, therefore enabling operational improvements, and detection of non-value added activities.

References:

[1] Noreen, Eric W., Brewer Peter C., et al., Managerial Accounting for Managers, Second Edition, McGraw-Hill/Irwin, New York, NY, 2011.

[2] Stout, David E., Propri, Joseph M., Implementing Time-Driven Activity-Based Costing at a Medium-Sized Electronics Company, Management Accounting Quarterly, Vol. 12, No. 3, Spring 2011.

[3] Robert S. Kaplan and Steven R. Anderson, Time-Driven Activity-Based Costing: A Simpler and More Powerful Path to Higher Profits, Harvard Business Publishing, Boston, Mass., 2007.

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