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10: Flexible budgeting ⏐ Part C Financial planning and control
1 Flexible budgets
1.1 Fixed budgets versus flexible budgets
• A fixed budget is a budget which is set for a single activity level.
• A flexible budget is a budget which recognises different cost behaviour patterns and is designed to change as
volume of activity changes.
Master budgets are based on planned volumes of production and sales but do not include any provision for the event
that actual volumes may differ from the budget. In this sense they may be described as fixed budgets.
A fixed budget is a 'budget set prior to the control period and not subsequently changed in response to changes in
activity, costs or revenue. It may serve as a benchmark in performance evaluation.' CIMA Official Terminology
Make sure you are clear on the difference between fixed and flexible budgets.
1.2 Advantages of flexible budgets
A flexible budget has two advantages.
(a) At the planning stage, it may be helpful to know what the effects would be if the actual outcome differs
from the prediction. For example, a company may budget to sell 10,000 units of its product, but may
prepare flexible budgets based on sales of, say, 8,000 and 12,000 units. This would enable contingency
plans to be drawn up if necessary.
(b) At the end of each month or year, actual results may be compared with the relevant activity level in the
flexible budget as a control procedure.
1.3 Preparation of flexible budgets
Step 1
The first step in the preparation of a flexible budget is the determination of cost behaviour patterns,
which means deciding whether costs are fixed, variable or semi-variable.
• Fixed costs are easy to spot. They remain constant as activity levels change.
• For non-fixed costs, divide each cost figure by the related activity level. If the cost is a variable cost,
the cost per unit will remain constant. If the cost is a semi-variable cost, the unit rate will reduce as
activity levels increase.
Step 2
The second step in the preparation of a flexible budget is to calculate the budget cost allowance for each
cost item.
Budget cost allowance = budgeted fixed cost* + (number of units × variable cost per unit)**
* nil for variable cost
** nil for fixed cost
Semi-variable costs therefore need splitting into their fixed and variable components so that the budget
cost allowance can be calculated.
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