How does variance analysis compare actual results with the budget, and what do favourable and unfavourable variances tell management?
Calculate budget variances for revenue and expenses, classify them as favourable or unfavourable, and explain how variance analysis supports control and decision-making
WACE Year 12 Accounting and Finance Unit 4 on variance analysis: comparing actual results with the budget, calculating revenue and expense variances, classifying them as favourable or unfavourable, and using them for control and management decision-making.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this dot point is asking
SCSA wants you to calculate variances, label them favourable or unfavourable using the effect on profit, and explain how they drive corrective action.
What a variance is
Favourable versus unfavourable
The label depends on the effect on profit, not on whether the number went up or down.
Investigating variances
Not every variance matters. Managers apply the principle of management by exception, investigating only variances large enough to be material. A variance prompts questions about its cause: was the budget unrealistic, did input prices change, was efficiency better or worse than expected? The answer guides corrective action, such as renegotiating supply prices or revising the next budget.
Why variances arise
A variance can stem from any of several causes, and identifying the cause is what makes the analysis useful. The budget itself may have been unrealistic, set too optimistically or too cautiously, in which case the fix is a better plan rather than action on operations. Input prices may have changed, so a materials cost overrun could reflect a supplier price rise rather than wasteful use. Efficiency may differ from plan, with more or fewer units produced per hour or per dollar of input. Volume may differ, since selling more or fewer units than budgeted moves both revenue and variable costs. A strong answer does not just label a variance; it suggests a plausible cause and the corrective action it points to, such as renegotiating supply contracts, retraining staff, or revising the next budget. This is the feedback loop at the heart of management accounting.
A variance is not automatically a sign of poor management. A favourable variance can be just as worth investigating as an unfavourable one, because it may reveal that the budget was set too cautiously, or that quality was cut to save cost. Variances should also be read together rather than in isolation, since a favourable expense variance achieved by underspending on maintenance may cause larger unfavourable variances in later periods. Used well, variance analysis closes the loop between planning and control: the budget sets the target, the variance measures the gap, and the response feeds back into the next budget so that future plans become more realistic.
Exam-style practice questions
Practice questions written in the style of SCSA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
WACE 20227 marksSelby Ltd budgeted sales of 380 000. Actual sales were 400 000. Calculate the sales variance, the expense variance and the profit variance, classify each as favourable or unfavourable, and show how they reconcile.Show worked answer →
A 7 mark response needs all three variances, correct labels, and the reconciliation.
Sales variance. Actual 500,000 above budget. Higher revenue raises profit, so this is $20,000 favourable.
Expense variance. Actual 380,000 above budget. Spending more reduces profit, so this is $20,000 unfavourable.
Profit variance. Budgeted profit . Actual profit . Profit variance is nil.
Reconciliation. The 20,000 unfavourable expense variance, netting to zero, which is why actual profit equals budgeted profit despite both lines differing. Markers reward correct labels (favourable for higher sales, unfavourable for higher expenses) and the netting reconciliation.
WACE 20235 marksExplain the principle of management by exception in variance analysis, and explain why a favourable variance may still be worth investigating.Show worked answer →
A 5 mark response needs the principle and the favourable-variance point.
Management by exception. Managers do not investigate every variance, only those large enough to be material. Small, expected fluctuations are ignored so attention and resources focus on the significant departures from plan that are most likely to need corrective action.
Favourable variances. A favourable variance is not automatically good news. It may reveal that the budget was set too cautiously and needs revising, or that a cost was cut in a way that harms the business, for example underspending on maintenance now causing larger unfavourable variances later, or cutting quality to save cost. Investigating favourable variances can therefore protect future performance. Markers reward the materiality-based exception principle and a valid reason a favourable variance deserves scrutiny.