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Variable Cost

A variable cost is an expense that changes in direct proportion to changes in business activity or output volume. Examples include raw materials, direct labour paid per unit, sales commissions, and shipping costs. Variable costs increase as production or sales volume rises and decrease as volume falls. Understanding variable cost behaviour is essential for contribution margin analysis, break-even calculation, pricing decisions, and cost-volume-profit modelling.

Why This Matters

Variable costs determine how a company’s cost base responds to changes in volume. For mid-market businesses experiencing growth or cyclical demand, knowing which costs scale with volume — and by how much — is essential for financial planning and margin protection. Misclassifying variable costs as fixed (or vice versa) distorts break-even analysis, contribution margins, and forecasts. Getting this right is the foundation for understanding how profit behaves when the business grows, shrinks, or shifts its product mix.

Where This Fits

This term sits within the Performance & Profitability area of Performance & Control.

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