Variable costing (also called direct costing or marginal costing) treats only those costs of production that vary with output as product costs. This approach dovetails with the contribution approach income statement and supports CVP analysis because of its emphasis on separating variable and fixed costs. The cost of a unit of product consists of direct materials, direct labor, and variable overhead. Fixed manufacturing overhead, and both variable and fixed selling and administrative expenses are treated as period costs and deducted from revenue as incurred.

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