CB2101 Chap.8 Flexible Budgets and Variance Analysis
Flexible Budgets and Variance Analysis
Compare performance at actual activity
A flexible budget recalculates expected revenue and variable cost for actual activity, separating volume effects from execution. Standard-cost variances then isolate price or rate differences from quantity or efficiency differences.
Related variances should be interpreted together because one operational choice can improve one measure and worsen another.
Build three comparison columns
The planning budget uses planned activity, the flexible budget uses actual activity with budgeted rates, and the actual column uses realised quantities and prices. Planning against flexible isolates activity.
Flexible against actual isolates revenue or spending at actual activity. This structure prevents higher output from being labelled overspending merely because variable cost exceeds the static plan.
Anchor standards to actual output
Standard quantity or hours allowed must follow the output actually achieved. Planned output belongs to the planning budget, not the efficiency benchmark.
Calculate the allowed input before either price or quantity variance. Label its unit and operating standard so a reviewer can see whether the production relationship was applied to the correct output.
Change one factor at a time
A price variance uses actual quantity exposed to the difference between actual and standard price.
A quantity variance values the difference between actual quantity and allowed quantity at the standard price. Labour follows the same structure with wage rate and hours. Signed amounts should reconcile to actual input cost minus standard cost allowed.
Interpret linked signals together
Cheaper material may create extra waste, and higher-paid labour may reduce time.
One variance can therefore be favourable while the connected variance is unfavourable. State an operational hypothesis and identify evidence such as supplier grade, scrap by batch, employee mix or downtime. The pair suggests a cause but does not prove responsibility.
Use materiality and controllability
A small percentage on a large pool can matter more than a dramatic percentage on a minor item.
Managers also influence different parts of the chain, yet departmental actions interact. Investigate magnitude, recurrence and causal evidence before assigning blame. Variance analysis is a prompt for inquiry, not an automatic performance verdict.
What this chapter covers
- 01
Planning and flexible budgets
- 02
Activity variance
- 03
Revenue and spending variance
- 04
Standard quantity allowed
- 05
Price and rate variance
- 06
Quantity and efficiency variance
Worked example · free
Separate material price and quantity effects
- 2Find standard quantity allowed.
- 2Calculate price variance.
- 2Calculate quantity variance and reconcile.
Key terms
- Flexible Budget
- Expected revenue and cost recalculated for the level of activity actually achieved.
- Standard Quantity
- The input quantity allowed for actual output under the operating standard.
- Efficiency Variance
- The standard-rate value of actual input time differing from time allowed for output.
Flexible Budgets and Variance Analysis FAQ
Why is the planning budget an unfair actual-cost benchmark?
It is based on planned activity. If actual output differs, part of the cost difference is expected volume effect rather than spending performance. The flexible budget holds actual activity constant for comparison.
Why does the price variance use actual quantity?
Actual quantity is the amount exposed to the actual-versus-standard price difference. Using standard quantity would omit the price effect on excess or saved input and prevent the variance components from reconciling.
Does favourable always mean good performance?
No. Cheaper material can increase waste, and higher-paid skilled labour can reduce time. Variances are signals that require linked operational evidence, not automatic praise or blame for one department.
How should I investigate a pair of opposing variances?
Propose a mechanism that could connect them, then name evidence that would distinguish it from alternatives. A favourable price and unfavourable quantity variance might reflect lower-grade material, but production conditions could also raise waste. Check supplier grade, scrap by batch and process records. Interpret magnitude and recurrence before assigning responsibility to purchasing or production.
Exam move
Lay out planning, flexible and actual columns before calculating, then explain which comparison isolates activity and which isolates execution. For standard costs, label actual price, standard price, actual quantity and standard quantity allowed with units. Derive allowed input from actual output before touching a variance formula.
Use signed arithmetic during the work and convert to favourable or unfavourable only after reconciliation to actual minus flexible-standard cost. Pair price with quantity and rate with efficiency, proposing one operational cause that could connect the results. Name a record that would test the hypothesis, such as supplier grade, scrap, employee mix or downtime.
End by ranking findings by materiality and recurrence rather than treating every favourable label as good performance.
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