Skip to content

Management Accounting · Flexible budgets

Flexed Budget Variance Analysis and Performance Reporting

Updated 11 October 2026 · Fact-checked

Flexed budget variance analysis compares actual results with a budget restated to the actual activity level. You flex the budget first: keep fixed costs, scale variable costs and sales. Then subtract to find each variance and label it favourable or adverse. This judges managers on efficiency, not volume differences.

Understand Budget Variance and Performance Reporting

A fixed budget is set for one planned level of activity. If actual activity is different, comparing actual costs with that budget is unfair. Higher output will nearly always cost more, and lower output will nearly always cost less. The difference tells you about volume, not about control.

A flexed budget fixes this. You restate the budget to the actual activity level. Variable costs and sales revenue change in proportion to activity. Fixed costs stay the same within the relevant range. Now budget and actual cover the same level of activity, so the comparison is like for like.

A variance is the difference between the flexed budget and the actual result. It is favourable (F) if it increases profit compared with the flexed budget. It is adverse (A) if it reduces profit. For costs, actual below flexed is favourable. For revenue, actual above flexed is favourable.

The difference between the original fixed budget and the flexed budget is the volume variance. It is caused only by activity being different from plan. The difference between flexed budget and actual is the expenditure, or spending, variance. It is the part managers can usually be held to account for.

A variance is a signal, not a verdict. A cost may be over flexed budget because of a supplier price rise outside the manager's control. Good reporting separates controllable from uncontrollable items and investigates the large ones.

Key formulas to remember

Flexed budget for a variable cost
Flexed cost = budgeted cost per unit × actual activity
Or budgeted cost ÷ budgeted activity × actual activity.
Flexed budget for a fixed cost
Flexed fixed cost = original budgeted fixed cost
Do not flex fixed costs unless the question says they step up.
Cost variance
Cost variance = Flexed budget cost − Actual cost
Positive = favourable. Negative = adverse.
Revenue or profit variance
Variance = Actual − Flexed budget
Positive = favourable. Negative = adverse.
Volume variance (fixed to flexed)
Flexed budget profit − Original budget profit
Shows the effect of activity level only.
Semi-variable cost
Flexed cost = fixed element + (variable rate × actual activity)
Split the cost first if only totals are given.

How to solve Budget Variance and Performance Reporting questions

Use this method for any question that asks for variances against a flexed budget.

  1. 1Identify the budgeted activity level and the actual activity level.
  2. 2Classify each budget line as variable, fixed or semi-variable.
  3. 3Calculate the budget cost per unit (or per hour) for each variable item.
  4. 4Build the flexed budget: variable items × actual activity, fixed items unchanged, sales at budget price × actual units.
  5. 5Compare each flexed figure with the actual figure. Revenue: actual − flexed. Costs: flexed − actual.
  6. 6Label every variance F or A, using the effect on profit.
  7. 7Total the variances and check they reconcile to the flexed budget profit less actual profit.
  8. 8Comment where asked: separate controllable from uncontrollable causes and suggest what to investigate.

Quickest way: Flex, subtract, label

When to use it: Use it for number entry or multiple choice questions where you need one variance quickly.

  1. Find only the line the question asks about. Do not build the whole budget.
  2. Work out the flexed figure: unit rate × actual units, or the fixed amount.
  3. Subtract in the direction that gives profit effect: costs flexed − actual, revenue actual − flexed.
  4. Read the sign: positive is F, negative is A.
  5. Sense-check: if actual cost is higher than flexed cost, your answer must be adverse.

Common mistakes in Budget Variance and Performance Reporting

  • Comparing actual results with the original fixed budget and calling the gap a variance.

    It is the simplest subtraction, and the activity levels differ without you noticing.

    Fix: Always check whether actual and budget activity match. If not, flex first.

  • Flexing fixed costs along with variable costs.

    Students scale the whole budget by the activity ratio.

    Fix: Scale only variable and the variable part of semi-variable costs. Keep fixed costs as budgeted.

  • Getting the favourable or adverse label wrong.

    Students memorise 'actual minus budget' for everything.

    Fix: Ask whether profit is higher or lower than the flexed budget. Higher costs are adverse; higher revenue is favourable.

  • Flexing to budgeted units instead of actual units.

    The budget figures are the ones on the page, so they get used.

    Fix: The flexed budget always uses the actual activity level.

  • Blaming managers for every variance.

    The numbers look like a measure of personal performance.

    Fix: Check controllability. Price changes by external suppliers or sudden events may be outside the manager's control.

  • Ignoring the semi-variable split.

    The cost is treated as wholly fixed or wholly variable.

    Fix: Separate the fixed and variable elements, then flex only the variable part.

Worked examples

Example 1

A department budgeted to make 2,000 units. Budget: sales $40,000; materials $12,000; labour $8,000; fixed overheads $6,000. Actual output and sales were 2,400 units: sales $45,600; materials $14,900; labour $9,100; fixed overheads $6,300. Calculate the flexed budget profit, actual profit and the variance for each line.

Show the solution
  1. Per unit budget: price $40,000 ÷ 2,000 = $20; materials $12,000 ÷ 2,000 = $6; labour $8,000 ÷ 2,000 = $4.
  2. Flex to 2,400 units: sales $48,000; materials $14,400; labour $9,600; fixed overheads stay $6,000.
  3. Flexed profit = 48,000 − 14,400 − 9,600 − 6,000 = $18,000.
  4. Actual profit = 45,600 − 14,900 − 9,100 − 6,300 = $15,300.
  5. Sales: 45,600 − 48,000 = $2,400 A.
  6. Materials: 14,400 − 14,900 = $500 A.
  7. Labour: 9,600 − 9,100 = $500 F.
  8. Fixed overheads: 6,000 − 6,300 = $300 A.
  9. Total variance = 2,400 A + 500 A + 500 F + 300 A = $2,700 A, which equals 18,000 − 15,300.

Answer: Flexed profit $18,000; actual profit $15,300; total variance $2,700 adverse (sales $2,400 A, materials $500 A, labour $500 F, fixed overheads $300 A).

Example 2

The original budget for 5,000 machine hours shows power costs of $15,000, of which $5,000 is fixed. Actual machine hours were 6,000 and actual power cost was $17,500. Calculate the power cost variance against the flexed budget and say whether it is favourable or adverse. Also state the volume effect on the power budget.

Show the solution
  1. Variable element in the budget = 15,000 − 5,000 = $10,000.
  2. Variable rate = 10,000 ÷ 5,000 = $2 per machine hour.
  3. Flexed budget at 6,000 hours = 5,000 + (2 × 6,000) = $17,000.
  4. Variance = flexed − actual = 17,000 − 17,500 = $500.
  5. Actual cost is higher than flexed cost, so it is adverse.
  6. Volume effect on the budget: flexed $17,000 − original $15,000 = $2,000 extra cost allowed because of higher activity.

Answer: Power cost variance is $500 adverse. Comparing with the original budget would wrongly show $2,500 adverse, of which $2,000 is only due to higher activity.

Exam tips

  • Read the activity level in the question twice. Most errors start with flexing to the wrong number of units.
  • In multiple response questions on interpretation, check which statements are about controllability rather than the arithmetic.
  • For number entry, enter the figure without the F or A unless the question asks for it, and watch the sign instruction.
  • Spot semi-variable costs: if the question gives costs at two activity levels, find the variable rate by dividing the cost change by the activity change.
  • Section B questions often ask for comment. Give one cause, say whether it is controllable and name who should investigate.

Practice questions from Flexible budgets

Budget Variance and Performance Reporting in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Budget Variance and Performance Reporting: frequently asked questions

What is the difference between a fixed budget variance and a flexible budget variance?

A fixed budget variance compares actual results with the original budget at planned activity. A flexible budget variance compares actual results with a budget restated to actual activity. The flexible version removes the effect of volume, so it is a fairer measure of control.

How do I calculate the variance between the flexed budget and actual?

Build the flexed budget at actual activity, with variable costs scaled and fixed costs unchanged. For costs, subtract actual from flexed. For revenue, subtract flexed from actual. A positive answer is favourable and a negative one is adverse.

Do fixed costs change in a flexed budget?

Normally no. Fixed costs stay at the budgeted amount within the relevant range of activity. The exception is a stepped cost, where the question tells you the cost rises at a certain activity level.

Does an adverse variance always mean the manager performed badly?

No. The cause may be outside the manager's control, such as a supplier price rise. You should investigate the cause before judging performance.