When variable costing is used,fixed production costs are included as part of inventory cost.

Variable Costing

An accounting method that only includes variable costs in product costs and treats fixed costs as period expenses.

Fixed Production Costs

Expenses that do not change with the level of production, such as rent for factory premises, salaries of permanent staff, and depreciation of machinery.

Inventory Cost

The total cost associated with acquiring, storing, and managing inventory, including purchase prices, storage costs, and shrinkage.