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Budgeting & Forecasting › Flexible Budgets

What is the difference between fixed, variable, and semi-variable costs in flexible budgeting?

Intermediate

Answer

Fixed costs stay constant regardless of activity within a range (rent). Variable costs change proportionally with activity (materials). Semi-variable (mixed) costs have both a fixed and a variable element (e.g., a phone bill with a standing charge plus usage). Flexible budgeting requires splitting mixed costs so only the variable part is flexed.
Real-world example A utility with a fixed standing charge plus usage is split so only the usage element flexes with volume.

Common follow-ups: What is a semi-variable cost? | Why must mixed costs be split?