Plain definition
A static budget is prepared for one planned level of activity and stays at that level for reporting comparisons, even if actual sales or production differ. It is useful for setting an original plan, but it does not by itself separate a volume change from a cost-control problem.
Illustrative example
Monetary examples use Saudi riyals (SAR). The same principles apply in other currencies.
A factory prepares a monthly static budget for 10,000 units. It budgets materials at per unit, or , and fixed factory costs of . Actual output is 14,000 units and actual materials cost is .
Compared with the static materials budget, actual spending is higher. But of that increase comes from making 4,000 more units at the budgeted rate. The remaining is the meaningful materials overspend against a budget adjusted to actual output. The static comparison is still useful for showing that activity exceeded plan; it is weak evidence of purchasing performance on its own.
| Actual materials cost | |
|---|---|
| Flexible materials budget | |
| Materials overspend |
A static budget does not become wrong because volume changed. It answers the question, ‘How did actual results compare with the original plan?’ A flexible budget answers a different question: ‘How did costs compare at the actual activity level?’
Why it matters
Calling the full an efficiency failure could lead management to pressure purchasing or production when the main cause was higher demand. The converse error is also possible: higher volume can conceal a poor unit cost if no adjusted comparison is made.
Practical consequence
Keep the approved static budget as the record of the original plan and identify its activity base. When actual volume differs materially, report volume and spending effects separately. Confirm whether each cost is fixed, variable, or mixed before using it in a flexible comparison; rent is not normally adjusted just because units increased. The analysis depends on a sensible activity driver, so it is less reliable where output is not the main cause of the cost.