Cost Classification and Cost Behavior Concepts

Cost Classification

Definition of Cost

  • Cost is the sacrifice made, usually measured by the resources given up to achieve a specific purpose.

Types of Costs

  • Direct Costs
    • Costs that can be easily and accurately traced to a cost object (e.g., specific products).
    • Example: The cost of flour used to produce bread can be directly traced to the bread.
  • Indirect Costs
    • Costs that cannot be easily or accurately traced to a cost object.
    • Example: Factory rent, utilities, and managerial salaries.

Allocation of Indirect Costs

  • Indirect costs are assigned to a cost object through allocation, which is based on convenience or assumed causal linkage due to the lack of a clearly observable relationship.
  • Indirect costs in service businesses may also be referred to as overhead costs or support costs.

Cost Objects

  • Types of Output:
    • Products and Services.
    • Products: Goods produced, e.g., televisions, hamburgers, computers.

Product Costs

  • Definition: The total cost of producing a product in a manufacturing firm or acquiring a product for sale in a merchandising firm.
  • Components of Product Costs:
    • Direct Materials: Raw materials that can be directly traced to products, e.g., flour for bread, wood for furniture.
    • Direct Labor: Labor costs related directly to manufacturing the product, e.g., wages of bakers.
    • Manufacturing Overhead: All other costs associated with production except direct materials and direct labor, e.g., depreciation and janitorial services.

Inventory of Product Costs

  • Product costs are initially recorded as inventory and moved to Cost of Goods Sold (COGS) upon sale.
  • Classification of product costs:
    • Direct materials
    • Direct labor
    • Manufacturing overhead

Cost Calculations

  • Total Product Cost: extTotalProductCost=extDirectMaterialsCost+extDirectLaborCost+extDirectExpenses+extManufacturingOverheadext{Total Product Cost} = ext{Direct Materials Cost} + ext{Direct Labor Cost} + ext{Direct Expenses} + ext{Manufacturing Overhead}
  • Unit Product Cost: ext{Unit Product Cost} = rac{ ext{Total Product Cost}}{ ext{Number of Units Produced}}

Prime Cost and Conversion Cost

  • Prime Cost:
    • extPrimeCost=extDirectMaterialsCost+extDirectLaborCost+extDirectExpensesext{Prime Cost} = ext{Direct Materials Cost} + ext{Direct Labor Cost} + ext{Direct Expenses}
  • Conversion Cost:
    • extConversionCost=extDirectLaborCost+extManufacturingOverheadext{Conversion Cost} = ext{Direct Labor Cost} + ext{Manufacturing Overhead}

Cost of Goods Manufactured

  • Definition: The total product cost of goods completed during a period and transferred to finished goods.
  • Formula for direct materials used in production:
    • extDirectMaterialsUsed=extBeginningInventory+extPurchases−extEndingInventoryext{Direct Materials Used} = ext{Beginning Inventory} + ext{Purchases} - ext{Ending Inventory}

Period Costs

  • Definition: Costs not considered product costs, incurred in other areas of the value chain (e.g., research, marketing).
  • Example: R&D, office supplies, CEO salary, advertising.
  • Period costs should be accounted for separately from product costs as they are recorded as expenses in the income statement.

Cost of Goods Sold

  • Calculation includes:
    • Cost of Goods Sold: extCostofGoodsSold=extBeginningFinishedGoodsInventory+extCostofGoodsManufactured−extEndingFinishedGoodsInventoryext{Cost of Goods Sold} = ext{Beginning Finished Goods Inventory} + ext{Cost of Goods Manufactured} - ext{Ending Finished Goods Inventory}

Cost Behavior

  • Variable Costs: Costs that vary with production levels, e.g., direct materials.
  • Fixed Costs: Costs that remain constant regardless of production volume, e.g., salaries of permanent staff.
  • Mixed Costs: Costs that contain both fixed and variable components.

Methods for Estimating Costs

  • High-Low Method:
    • Used to separate mixed costs into fixed and variable components.
    • Requires identifying the highest and lowest level of activity and their corresponding costs.
    • Formula for variable cost per unit:
    • ext{Variable Cost per Unit} = rac{ ext{Difference in Total Cost}}{ ext{Difference in Production Volume}}