ACT503 Chap.9 Flexible Budgets and Variance Analysis
Flexible Budgets and Variance Analysis
Three columns, and the middle one is the whole apparatus
A static budget is built for one planned level of output, so comparing it directly with an actual result at a different level mixes a change in volume with a change in how well resources were managed. The flexible budget separates them by asking what the budget would have said if it had known the output that actually occurred.
Actual result against flexible budget gives the flexible budget variance, which is about management; flexible budget against static budget gives the sales volume variance, which is about volume. A variance is favourable when it increases operating income relative to the budget and unfavourable when it reduces it, so for a cost actual below standard is favourable.
Those labels are arithmetic rather than evaluative, and a favourable materials price variance earned by buying inferior material is favourable and bad.
Two variances per input, differing in what is held constant
Each direct cost input splits into a price variance, which holds quantity at the actual level and varies the rate, and an efficiency variance, which holds the rate at standard and varies the quantity.
The convention is fixed so that the two add without double counting the overlap. The phrase that does the work is allowed for the actual output: the standard quantity is never the one in the static budget but is recomputed at the output actually achieved, which is exactly what makes the budget flexible.
A standard is itself two budgeted numbers, a quantity per unit and a price, so a persistent unfavourable efficiency variance across every department is more likely to mean the standard was set too tight than that everyone is performing badly.
Overhead splits four ways, and one of the four is different
Variable overhead behaves like a direct cost and splits into spending and efficiency variances; because it is applied on an allocation base, its efficiency variance uses exactly the same quantity difference as the labour efficiency variance and can never be managed independently of it.
Fixed overhead cannot flex with output, so its two variances answer different questions. The spending variance asks whether more was spent than budgeted. The production volume variance asks whether the capacity the fixed cost bought was used at the rate assumed when the absorption rate was set, and it can be unfavourable even if every invoice arrived exactly at budget.
Describing it as overspending is the standard error; it is under utilised capacity and an artefact of absorption costing.
What this chapter covers
- 01
Static budget, flexible budget and actual result
- 02
The flexible budget variance and the sales volume variance
- 03
The favourable and unfavourable convention, and why it is not praise
- 04
Price and efficiency for each direct cost input
- 05
The standard quantity allowed for the actual output
- 06
Materials price measured at purchase or at use
- 07
Variable overhead spending and efficiency
- 08
Fixed overhead spending and production volume
- 09
Management by exception and the three filters
Four direct cost variances, and the story they tell together
- 4Materials price and materials efficiency, with the standard quantity recomputed.
- 4Labour rate and labour efficiency.
- 2One sentence reading the four as a single decision.
Key terms
- Flexible Budget
- A budget recomputed at the output level that actually occurred. It separates the effect of selling a different volume from the effect of managing resources differently, and every price and efficiency variance is measured against it.
- Sales Volume Variance
- The difference between the flexible budget and the static budget, which arises entirely because output differed from plan. It is the variance that answers whether the firm sold what it intended to sell.
- Efficiency Variance
- The standard rate multiplied by the difference between the actual quantity used and the standard quantity allowed for the actual output. It holds the rate constant so that it does not double count the overlap with the price variance.
- Production Volume Variance
- Budgeted fixed overhead less the fixed overhead absorbed by the actual output. It measures capacity used against the denominator volume assumed when the absorption rate was set, and it is not a spending variance.
- Management By Exception
- The practice of directing management attention only to results that will repay investigation, filtered by size relative to the base, persistence across periods and controllability by an identified manager.
Flexible Budgets and Variance Analysis FAQ
What does favourable actually mean?
That the outcome increased operating income relative to the budget, which for a cost means actual below standard and for a revenue means the opposite. The label is arithmetic rather than evaluative. A favourable materials price variance earned by buying cheaper material that then wastes in production is favourable and bad, and computing the variances together is what makes that pairing visible.
Which quantity is the standard one in an efficiency variance?
The quantity allowed for the output actually achieved, recomputed rather than taken from the static budget. That recomputation is what makes the budget flexible and it is where most errors in this area start, because the static budget quantity is the figure printed in front of you and the allowed quantity is not printed anywhere.
Why is the production volume variance not about spending?
Because it arises purely from absorbing fixed overhead into units at a rate computed on a denominator volume. Produce fewer units than that denominator and less fixed overhead is absorbed than was budgeted, which shows as unfavourable even if every invoice came in exactly at budget. Call it under utilised capacity and note that it is an artefact of absorption costing rather than a fact about cash.
Can the variable overhead efficiency variance be managed on its own?
No. It is computed on the same quantity difference as the labour efficiency variance and differs only in the rate applied, so it always points the same way and moves only when the base moves. A manager told to fix it has been handed a labour problem in disguise, and saying so is worth marks in an interpretation requirement.
What should a variance commentary contain?
Four clauses: the variance named, its size stated relative to the cost it sits in rather than in isolation, the manager who could have influenced it, and one action that would change it. A commentary that restates each figure in words has described the table beside it and earns nothing from the application half of the published rubric.
Exam move
Compute a full set of eight variances once, then deliberately reverse one direction word and follow what it does to your written conclusion. Seeing a correct set of numbers produce the opposite recommendation is the fastest way to build the habit of re-deriving every direction word from its own comparison before handing in.
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