Budgeting & Forecasting › Flexible Budgets
What is the relevant range and why does it matter for flexible budgets?
BeginnerAnswer
The relevant range is the band of activity over which cost behavior assumptions hold—fixed costs stay fixed and variable cost per unit stays constant. Flexing a budget is only valid within this range; outside it, fixed costs may step up (more supervisors, extra premises) and unit variable costs may change, so the assumptions break down.
Real-world example Doubling output beyond the relevant range forces a new factory lease, so 'fixed' costs step up.