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Budgeting & Forecasting › Flexible Budgets

What are the limitations of flexible budgeting?

Intermediate

Answer

Limitations include the difficulty of accurately splitting mixed costs, the assumption that variable costs are strictly linear within the relevant range, ignoring step changes and economies of scale, and reliance on a single or few activity drivers. Outside the relevant range or with complex cost behavior, flexed figures can mislead.
Real-world example Assuming linear variable cost breaks down when a bulk-buying discount kicks in at higher volumes.

Common follow-ups: Why can linearity assumptions fail? | What happens outside the relevant range?