Activity-Based Costing

Related Terms: Overhead Costs; Product Costing

Activity-based costing (ABC) is an accounting method that allows businesses to gather data about their operating costs. Costs are assigned to specific activities—planning, engineering, or manufacturing—and then the activities are associated with different products or services. In this way, the ABC method enables a business to decide which products, services, and resources are increasing their profitability, and which are contributing to losses. Managers are then able to generate data to create a better budget and gain a greater overall understanding of the expenses that are required to keep the company running smoothly. Generally, activity-based costing is most effective when used over a long period of time.

Activity-based costing emerged in the 1980s as a way to more accurately measure all of a business's costs and associate them to the goods and services produced. Traditional cost accounting methods were designed for the companies operating in the early days of the 20th Century, a time when direct labor and materials were the two largest costs associated with producing goods and services. There was little automation at the time and overhead costs were very small as a percentage of total costs. Furthermore, most companies offered a narrow range of products and/or services. All this was changing by the middle of the century. Automation was being incorporated into all businesses and overhead costs rose as the support services needed to design and manage this automation were removed from the production floor. Yet traditional cost accounting methods stayed in place. Owners continued to measure primarily the costs of direct labor and materials; they allocated overhead costs somewhat arbitrarily. As overhead costs grew as a share of total costs, the distortions that this method introduced also grew.

Harvard Business School Professor Robert S. Kaplan was among the first to articulate a need for a more sophisticated system with which to more accurately allocate costs directly to the goods and services produced by that business. ABC is based on the principle that the majority of business activities support the production and delivery of goods and services. Therefore, in order to get a true picture of the cost of producing a good or service, one must allocate the costs of all business activity to specific products and services. The ABC method does this by assigning factory and corporate overhead, as well as other indirect resource costs, to activity categories. Then, an assessment is made as to how much overhead each product, product line, or service consumes. In this way, according to Professor Kaplan, in an article he wrote for The CPA Journal in 1990, "ABC offers management accurate information by delineating support costs and tracing them to individual products and product lines."

HOW ACTIVITY-BASED COSTING PROGRAMS WORK

Implementing an activity-based costing program requires planning by and a commitment from upper management. If possible, it is best to do a trial study or test run on a department whose profit-making performance is not up to snuff. These types of situations have a greater chance of succeeding and demonstrating that an ABC program is worth the effort. If the pilot study yields no savings in cost, the activity-based costing system has either been improperly implemented or, it may not be right for the company.

The first thing a business must do when using ABC is set up a team charged with determining which activities are necessary for the product or service in question. This team needs to include experts from different areas of the company (including finance, technology, and human resources); an outside consultant may also be helpful.

After the team has assembled data on such topics as utilities and materials, it is time to determine the elements of each activity that cost money. Attention to detail is very important: many of these costs may be hidden and not entirely obvious. As Joyce Chutchian-Ferranti wrote in an article for Computerworld: "The key is to determine what makes up fixed costs, such as the cost of a telephone, and variable costs, such as the cost of each phone call." Chutchian-Ferranti goes on to note that even though in many instances technology has replaced human labor costs (such as in voice-mail systems), a business manager must still examine the hidden costs associated with maintaining the service. Nonactivity costs like direct materials and services provided from outside the company usually do not have to be factored in because this has previously been done.

Once all of these costs are determined and noted, the information must be input into a computer application. Chutchian-Ferranti explains that the software can be a simple database, off-the-shelf ABC software, or a customized software program written for the specific job. Over time, this accumulation of data will eventually give the company a detailed picture of exactly where in the process they are spending most and in which areas they are most efficient.

After a business has had enough time to analyze the data obtained through activity-based costing and to determine which activities are cost effective, it can decide what steps can be taken to increase profits. Activities deemed cost prohibitive can then be outsourced, cut back, or eliminated altogether. The implementation of these changes is known as activity-based management (ABM).

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