The cost of inventory includes all the costs necessary to bring the goods to their present location and condition ready for sale. The costs have three main components.
- Costs of purchase
- Costs of conversion
- Other costs
The cost of purchase is the cost of buying products and services for use in production, the cost of conversion is the cost of converting those purchases into a finished product, and other costs are all additional costs of bringing the inventory to its present location and condition ready for sale.
Cost of Purchase
The costs of purchase are the costs directly related to the acquisition of finished goods, materials and services, they include
- Product purchase price
- Direct materials
- Import duties
- Non recoverable taxes
- Handling costs
- Other acquisition costs
- less: Trade discounts
- less: Purchase discounts
- less: Rebates
Cost of Conversion
The costs of conversion are costs directly related to the conversion of the purchased materials (costs of purchase) into a finished product. Costs of conversion include direct labor and allocated variable and fixed overheads.
- Direct labor
- Normal spoilage
- Indirect materials
- indirect labor
Variable overhead is allocated to units of production based on usage.
Fixed overheads relating to production facilities
- Management labor costs
- Administration labor costs
Fixed overhead is allocated to units of production based on normal production capacity.
Other costs include any cost which is incurred in bringing the inventory to its present location and condition.
Costs Excluded from Cost of Inventory
The followings costs are excluded from the cost of inventory.
- Selling costs
- Warehousing and storage costs, unless the storage is needed as part of the production process.
- Administrative overheads that are not a cost of bringing the inventory to its present location and condition.
- Interest and finance costs
- Abnormal costs for items such as of from freight-in, spoilage, and handling costs.
Having determined which costs are included in the cost of inventory, the next step is to decide the cost flow assumption (FIFO, LIFO, average etc) to be used to allocate the costs between inventory and cost of goods sold at the end of an accounting period.