What are the features and limitation of variable costing?

Variable costing, also known as direct costing or marginal costing, is a valuation method where only variable manufacturing costs are assigned to the product. Fixed manufacturing overheads are treated as period costs and are charged against the revenue of the period in which they are incurred.

Features of Variable Costing

1. Cost Classification: Costs are strictly segregated into fixed and variable components. Semi-variable costs are decomposed into these two categories for analysis.
2. Product Costing: Only variable manufacturing costs—Direct Material, Direct Labor, and Variable Factory Overheads—are included in the cost of the product.
3. Treatment of Fixed Overheads: Fixed manufacturing overheads are treated as "period costs." They are written off in full against the contribution margin of the period and are not carried forward in inventory.
4. Inventory Valuation: Finished goods and work-in-progress (WIP) inventories are valued only at variable production costs. Consequently, inventory values are lower compared to absorption costing.
5. Contribution Focus: The primary focus is on the "Contribution Margin" (Sales minus Variable Costs), which helps management understand the relationship between volume, cost, and profit.

Limitations of Variable Costing

1. Difficulty in Segregation: In practical business operations, it is often difficult and arbitrary to accurately separate costs into purely fixed and variable elements, especially semi-variable expenses.
2. Non-compliance with Accounting Standards: Variable costing is not recognized by Generally Accepted Accounting Principles (GAAP), International Financial Reporting Standards (IFRS), or Nepal Accounting Standards (NAS) for external financial reporting and tax purposes.
3. Understatement of Inventory: By excluding fixed manufacturing overheads, the value of closing stock is understated on the balance sheet, which may result in a misleading representation of the firm's current assets.
4. Long-term Pricing Issues: While useful for short-term decision-making, variable costing can be dangerous for long-term pricing. In the long run, a business must recover all costs (both fixed and variable) to remain sustainable.
5. Irrelevance in Highly Automated Industries: In modern capital-intensive industries (like large-scale hotel chains), fixed costs (depreciation, insurance, etc.) form a massive portion of total costs. Ignoring these in product costing can lead to distorted profit analysis.