Variable and Absorption Costing: Videos & Practice Problems
Variable and Absorption Costing compares two ways to assign manufacturing costs to products. Under absorption costing, all manufacturing costs are included in product cost, including direct materials, direct labor, variable manufacturing overhead, and fixed factory overhead. This method is required for external financial statements under GAAP. Under variable costing, only production-related variable costs are assigned to goods, while fixed manufacturing costs are treated differently.
The central difference is how fixed factory overhead is handled. In absorption costing, fixed overhead is a product cost; in variable costing, it is a period cost. Both methods include direct materials and direct labor, but variable costing excludes fixed manufacturing overhead from unit product cost. Because of this, variable costing is often used for internal decision making, while absorption costing is used for external reporting. Understanding this distinction helps explain why the two methods can produce different cost information and support different managerial purposes.
Absorption and Variable Costing
Absorption and Variable Costing
What costs are included in product costs under absorption costing?
Direct materials and direct labor
Direct materials, direct labor, and variable manufacturing overhead
Direct materials, direct labor, variable manufacturing overhead, and fixed manufacturing overhead
Direct materials, direct labor, variable manufacturing overhead, fixed manufacturing overhead, and external costs
Here's what students ask on this topic:
The main difference between absorption costing and variable costing lies in how fixed manufacturing overhead costs are treated. In absorption costing, both variable and fixed manufacturing costs are included in the product cost, meaning fixed overhead is allocated to each unit produced. This method is required for external financial reporting under GAAP. In contrast, variable costing assigns only variable production costs—such as direct materials, direct labor, and variable overhead—to products. Fixed manufacturing overhead is treated as a period cost and expensed in the period incurred, not assigned to inventory. This distinction makes variable costing useful for internal decision-making because it separates costs that vary with production from those that remain constant regardless of output.
Absorption costing is required for external financial reporting under GAAP because it complies with the matching principle, which states that all manufacturing costs, including fixed overhead, should be matched with the revenues generated by the products. By including both fixed and variable manufacturing costs in product costs, absorption costing ensures that inventory values on the balance sheet reflect the full cost of production. This method provides a more comprehensive view of product costs and profitability for external users such as investors and regulators. Variable costing, while useful internally, does not meet GAAP requirements because it treats fixed overhead as a period expense rather than a product cost.
Variable costing helps managers make better business decisions by clearly separating variable costs from fixed costs. Since only variable production costs are assigned to products, managers can see how costs change with production volume. Fixed costs, which do not vary with output, are treated as period expenses and excluded from product costs. This distinction allows managers to analyze contribution margin, which is sales revenue minus variable costs, to understand the impact of production changes on profitability. It also aids in decisions like pricing, product mix, and cost control by focusing on costs that can be influenced in the short term, making variable costing a valuable internal management tool.
Under variable costing, product cost includes only the variable production costs. These are direct materials, direct labor, and variable manufacturing overhead. Fixed manufacturing overhead costs, such as rent or janitorial expenses related to the factory, are not included in product costs but are treated as period expenses and charged in full during the period incurred. This means that the cost assigned to each unit produced reflects only the costs that vary directly with production volume, providing a clearer picture of the incremental cost of making each product.
Under absorption costing, fixed manufacturing overhead costs are included in the cost of inventory. This means that a portion of fixed overhead is allocated to each unit produced and included in the inventory value on the balance sheet. As a result, when inventory levels increase, some fixed overhead costs are deferred in inventory rather than expensed immediately, which can increase reported profits. Conversely, when inventory decreases, previously deferred fixed overhead costs are released to the income statement, affecting net income. This treatment aligns with GAAP but can sometimes obscure the true fixed cost behavior in profitability analysis.
