Flexible budget explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
A fixed budget is made for one level of activity. If the factory then makes fewer or more units than planned, comparing actual cost with that budget mixes two things: the effect of volume and the effect of efficiency. A flexible budget fixes this by restating the budget at the activity actually reached, so the comparison is fair.
A flexible budget sets the cost allowed at each level of activity: variable cost moves with output, fixed cost stays put, and semi-variable cost has a fixed part and a variable part. Compare actual with the budget at actual output, not with the original budget. Zero-based budgeting rebuilds each activity's budget from nil and ranks the requests. Three ratios measure use of capacity, level of activity and efficiency. Use flexible budgets to judge managers on what they controlled.
Fixed against flexible budgets
A fixed (static) budget is not changed after approval. A flexible budget is a family of budgets at different activity levels, or a formula (fixed amount + rate per unit) that can be applied to any level. To prepare one, classify each cost: variable (material, direct labour, variable overhead), fixed (rent, supervisors) and semi-variable (maintenance, power with a minimum charge), which is split into a fixed part and a variable rate. The classification is the same as in break-even analysis. A budgeting and forecasting engagement can build this model for your own plant.
Worked example: a unit budgeting at three capacity levels
Full capacity is 10,000 units a month. Assumed unit data: selling price ₹130; direct material ₹40; direct labour ₹25; variable overhead ₹15; maintenance ₹20,000 fixed plus ₹2 a unit; other fixed costs ₹150,000.
| ₹ | 6,000 units (60 per cent) | 8,000 units (80 per cent) | 10,000 units (full capacity) |
|---|---|---|---|
| Sales | 780,000 | 1,040,000 | 1,300,000 |
| Direct material | 240,000 | 320,000 | 400,000 |
| Direct labour | 150,000 | 200,000 | 250,000 |
| Variable overhead | 90,000 | 120,000 | 150,000 |
| Maintenance (20,000 + 2 a unit) | 32,000 | 36,000 | 40,000 |
| Fixed costs | 150,000 | 150,000 | 150,000 |
| Total cost | 662,000 | 826,000 | 990,000 |
| Profit | 118,000 | 214,000 | 310,000 |
Checks: at 6,000: 240,000 + 150,000 + 90,000 + 32,000 + 150,000 = 662,000; 780,000 − 662,000 = 118,000. At 8,000: 320,000 + 200,000 + 120,000 + 36,000 + 150,000 = 826,000; profit 214,000. At full capacity: 400,000 + 250,000 + 150,000 + 40,000 + 150,000 = 990,000; profit 310,000.
The fixed budget is set at 80 per cent: profit ₹214,000.
Actual month. The unit makes and sells 7,000 units (70 per cent) at an average price of ₹128.
Budget restated at 7,000 units
- Sales 7,000 × 130 = 910,000; material 280,000; labour 175,000; variable overhead 105,000; maintenance 20,000 + 14,000 = 34,000; fixed 150,000.
- Total cost = 280,000 + 175,000 + 105,000 + 34,000 + 150,000 = 744,000. Profit = 910,000 − 744,000 = 166,000.
Comparison
| ₹ | Actual | Flexible budget at 7,000 | Variance | Fixed budget at 8,000 |
|---|---|---|---|---|
| Sales | 896,000 | 910,000 | 14,000 A | 1,040,000 |
| Direct material | 292,000 | 280,000 | 12,000 A | 320,000 |
| Direct labour | 176,000 | 175,000 | 1,000 A | 200,000 |
| Variable overhead | 108,000 | 105,000 | 3,000 A | 120,000 |
| Maintenance | 35,000 | 34,000 | 1,000 A | 36,000 |
| Fixed costs | 152,000 | 150,000 | 2,000 A | 150,000 |
| Total cost | 763,000 | 744,000 | 19,000 A | 826,000 |
| Profit | 133,000 | 166,000 | 33,000 A | 214,000 |
Checks: actual sales 7,000 × 128 = 896,000. Actual costs 292,000 + 176,000 + 108,000 + 35,000 + 152,000 = 763,000; profit 896,000 − 763,000 = 133,000. Profit variance = 133,000 − 166,000 = −33,000 (A) = −14,000 (price) − 19,000 (cost).
Against the fixed budget, profit is ₹81,000 short (214,000 − 133,000). The flexible comparison splits this: ₹48,000 (214,000 − 166,000) is the effect of selling 1,000 fewer units, and ₹33,000 is price and cost performance at the level actually reached. 48,000 + 33,000 = 81,000.
What the owner decides. The sales shortfall of 1,000 units is a marketing matter (₹48,000). The managers of production answer for the ₹19,000 of cost overruns, mostly ₹12,000 of material at the actual volume; the ₹14,000 on sales came from a price ₹2 lower than budget on 7,000 units. A fixed-budget review would have blamed production for ₹81,000 and missed that more than half was volume.
Zero-based budgeting
Incremental budgeting adds a percentage to last year's figures, which keeps old waste. Zero-based budgeting (ZBB) asks each activity to justify its cost from zero. The stages: define decision units (departments or activities); prepare a decision package for each, stating purpose, alternatives, cost and benefit and the result of not doing it, including levels (minimum, current, enhanced); rank the packages by benefit; allocate funds down the list until the budget is used. It suits discretionary costs such as training, marketing and administration, not direct production costs that follow volume. For the board-level process view, see the guide on zero-based budget process under board review. Performance budgeting ties budget lines to measurable outputs, for example cost per inspection or per training day, in place of line items alone.
Budget ratios
Suppose the standard time is 2 hours a unit. Budgeted hours for 8,000 units = 16,000. Actual output 7,000 units means standard hours for actual output = 14,000. Actual hours worked, 14,700 (assumed).
| Ratio | Formula in words | Calculation | Result |
|---|---|---|---|
| Capacity usage | Actual hours ÷ budgeted hours | 14,700 ÷ 16,000 | 91.9 per cent |
| Activity | Standard hours for actual output ÷ budgeted hours | 14,000 ÷ 16,000 | 87.5 per cent |
| Efficiency | Standard hours for actual output ÷ actual hours | 14,000 ÷ 14,700 | 95.2 per cent |
Activity = capacity × efficiency: 0.919 × 0.952 = 0.875 (rounded). The unit used 92 per cent of planned hours but produced only 87.5 per cent of planned output, because workers took more hours than standard. For the cost effect of the same gap see overhead variances.
Common mistakes
- Comparing actual with the original budget when volume has changed.
- Treating semi-variable costs as fully fixed or fully variable.
- Forgetting that step costs rise in jumps at certain volumes.
- Using zero-based budgeting for costs that follow production.
- Setting a flexible budget that managers cannot follow.
Need help with flexible budgets?
If monthly reviews turn into arguments about volume, we can help build a flexible budget and a ZBB review for overheads through budgeting and forecasting support.
Key takeaways
- A flexible budget restates cost allowances at the actual level of activity.
- Classify every cost as fixed, variable or semi-variable first.
- Compare actual with the budget at actual output; separate volume from performance.
- Zero-based budgeting rebuilds discretionary budgets from nil and ranks packages.
- Capacity, activity and efficiency ratios link hours to output.
Read next
- Functional budgets and the master budget
- Overhead variances: expenditure, volume and efficiency
- Break-even point, contribution and margin of safety
Disclaimer: The methods described are standard cost accounting and financial management techniques. The worked example uses an invented business and invented figures, including any tax, interest or exchange rate, which are assumptions for illustration and not current rates. Where the article refers to a legal requirement, the linked guide and the official text should be checked. This article is general information, not legal advice; check the official text before acting.