I. Definition
Activity based costing (ABC) is an accounting method that identifies the activities a firm performs creating the real cause of the overhead, and then assigns the indirect costs of those activity only to the products that are actually demanding the activities. An activity based costing (ABC) system recognizes the relationship between costs, activities and products, and through this relationship assigns indirect costs to products less arbitrarily than traditional methods.
Some costs are difficult to assign through this method of cost accounting. Indirect costs, such as management and office staff salaries are sometimes difficult to assign to a particular product produced. For this reason, this method has found its niche in the manufacturing sector.
Traditional costing and ABC
Traditionally cost accountants had arbitrarily added a broad percentage of analysis into the indirect cost. In addition, activities include actions that are performed both by people and machine. However, as the percentages of indirect cost rose (i.e. automation), this technique became increasingly inaccurate, because indirect costs were not caused equally by all products. For example, one product might take more time in one expensive machine than another product—but since the amount of direct labor and materials might be the same, additional cost for use of the machine is not being recognized when the same broad 'on-cost' percentage is added to all products. Consequently, when multiple products share common costs, there is a danger of one product subsidizing another.
ABC as an approach to solve the problems of traditional cost management systems. These traditional costing systems are often unable to determine accurately the actual costs of production and of the costs of related services. Consequently managers were making decisions based on inaccurate data especially where there are multiple products.
Instead of using broad arbitrary percentages