What it means
When a company sets its budget, it plans to use a certain amount of capacity, such as 10,000 machine hours. It also budgets its fixed overhead, such as rent and depreciation, which does not change with output.
Dividing the fixed overhead by the planned hours gives a standard rate per hour. If actual hours used turn out lower than the plan, the company absorbs less overhead into products than it spent.
The shortfall is an unfavourable variance. If actual hours exceed the plan, more overhead is absorbed and the variance is favourable.
The variance is therefore a signal about demand or efficiency. A negative figure may mean orders fell, machines broke down or scheduling was poor.
A positive figure may mean strong demand, though it can also mean the plant is being pushed hard. In some systems, this result is called the volume variance or the capacity usage variance, and it may be split from an efficiency variance.
The names differ, but the logic is the same: it compares actual use of capacity with what was planned, valued at the standard fixed overhead rate. The measure should be read with care.
Fixed costs do not truly vary with output in the short term, so the variance does not mean cash was saved or lost. It tells managers about the use of resources and the pricing impact, since product costs were set assuming a certain volume.
Production managers are often judged on this variance, but they may not control demand. Sales and operations should review it together, and the explanation should say whether the cause was demand, machine downtime or planning.
In practice
Real-world examples.
Example
A furniture maker budgets 5,000 machine hours but uses only 4,500 because of a slow sales month. At a standard fixed overhead rate of $16 per hour, the variance is (4,500 - 5,000) x 16 = -$8,000. The report shows it as unfavourable and links it to weak orders. The sales director is asked to explain the dip in demand.
Example
A packaging plant receives a large rush order and runs 6,200 hours against a budget of 5,500. At a rate of $12 per hour, the variance is 700 x 12 = $8,400 favourable. The operations manager notes that overtime also raised labour cost. The favourable variance therefore overstates the true gain from the rush order.
Example
A chemical producer shuts down for repairs for two weeks. Hours fall well below budget, and the variance report shows a large unfavourable figure. Finance separates the repair-related shortfall from the demand-related shortfall.
Formula
Calculation
Capacity utilisation variance = (Actual capacity used - Budgeted capacity used) x Standard fixed overhead rate per unit of capacity
Suppose a plant budgets fixed overhead of $200,000 and 10,000 machine hours, out of a maximum of 12,500 hours. The standard rate is 200,000 / 10,000 = $20 per hour.
Actual hours used are 9,000, so the utilisation is 9,000 / 12,500 = 72% compared with a budget of 10,000 / 12,500 = 80%.
Variance = (9,000 - 10,000) x 20 = -1,000 x 20 = -$20,000, which is unfavourable.Case study
Seen in the real world.
Stonebridge Components is a fictional manufacturer of metal fittings. Its budget assumed 20,000 machine hours a quarter at a standard fixed overhead rate of $25 per hour. In one quarter the plant used only 17,000 hours.
The variance report showed an unfavourable figure of 3,000 x 25 = $75,000. The production manager blamed low orders, while the sales director said that late deliveries had cost the company some contracts, so the two functions disagreed.
The finance team traced the lost hours to a three-day machine failure and a drop in orders from one customer. In the illustrative review they split the variance into the two causes, which allowed management to fix maintenance planning and to pursue replacement orders. The company now reports the variance each month with a short note on the cause, and it has agreed that sales and production leaders will review the figures together before the results are circulated.
Watch out
Common mistakes.
- Reading the variance as a cash loss. Fixed costs are paid regardless, so the variance shows under-absorbed overhead, not extra spending.
- Blaming production for every adverse result. Demand and sales planning often drive the shortfall.
- Mixing up definitions. Some firms call it a volume variance or capacity usage variance, so confirm the formula in use.
Questions
People also ask.
Is a favourable variance always good?
Not always, because it may come from pushing machines hard or building stock that does not sell. Extra output only helps if customers buy it.
How is it different from the capacity utilisation rate?
The rate is a percentage of capacity used, while the variance values the difference from budget in dollars.
Who should act on it?
Operations, sales and finance together, since the cause could be demand, downtime or planning. A joint review prevents each team from blaming the others.
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