Indirect materials are materials used in the production process, but which cannot be linked to a specific product or job. Alternatively, they may be used in such insubstantial quantities on a per-product basis that it is not worthwhile to track them as direct materials (which involves including them in the bill of materials). Thus, they are consumed as part of the production process, but are not integrated in substantial amounts into a product or job. Examples of indirect materials are:
Disposable safety equipment
Fittings and fasteners
Indirect materials can be accounted for in one of two ways:
They are charged to expense as incurred.
Of the two accounting methods, inclusion in manufacturing overhead is considered more theoretically accurate, but if the amount of indirect materials is small, it is quite acceptable to instead charge them to expense as incurred.
Indirect materials are not usually tracked through a formal inventory record keeping system. Instead, an informal system is used to determine when to order additional indirect materials.