Costing And Budgeting Manufacturing Business

Introduction

Management accounting supplies the internal figures that the owners and managers of a small business rely on to price their products, plan for the months ahead and judge whether operations have performed as expected. Unlike financial accounting, which is governed by external reporting standards, management accounting is shaped entirely by what decision-makers need to know (Drury, 2021). This model assignment demonstrates how an undergraduate might approach a typical costing and budgeting brief for a small manufacturer. It is written as reference material only, to illustrate the structure, workings and commentary that a well-organised answer contains, and it is not intended to be submitted as a student’s own work.

Using a single illustrative company and a consistent set of invented figures, the assignment works through three linked tasks. The first prepares profit statements under absorption and marginal costing and reconciles the two results. The second builds a flexed budget and calculates the resulting variances. The third interprets what those workings mean for the people running the business. Throughout, the emphasis falls as much on presenting the numbers clearly and explaining the reasoning as on the arithmetic itself, because a figure that is not understood cannot support a decision.

Scenario: Pennine Planters Ltd

Pennine Planters Ltd is a small manufacturer based in West Yorkshire that produces a single product, a powder-coated steel garden planter, which it sells to independent garden centres for £45 each. The company absorbs its fixed production overhead on a per-unit basis using a normal activity level of 5,000 planters per quarter. Budgeted fixed production overhead is £40,000 per quarter, and fixed selling and administration costs are budgeted at £15,000. The standard cost card below summarises the resources each planter is expected to consume. Every figure in this assignment is illustrative and has been created purely to demonstrate the techniques.

Table 1: Standard unit cost card

Part 1: Absorption and Marginal Costing

The two costing methods differ only in how they treat fixed production overhead. Marginal costing treats fixed overhead as a period cost and writes it off in full against the period in which it is incurred; only variable costs are carried in inventory. Absorption costing, by contrast, treats a share of fixed production overhead as a product cost, so that unsold units carry some fixed overhead forward into the next period as part of their inventory value (Atrill and McLaney, 2019). The distinction has no effect on cash flow, but it does change reported profit whenever the quantity produced differs from the quantity sold.

During the quarter under review, Pennine Planters produced 5,000 units in line with its normal activity level but sold only 4,500, leaving 500 planters in closing inventory. A variable selling cost of £2.00 is incurred for each unit sold. Because production equals the normal activity level, fixed overhead is neither over- nor under-absorbed, which keeps the absorption statement straightforward. The two profit statements are presented below.

Table 2: Profit statement under marginal costing (£)

Table 3: Profit statement under absorption costing (£)

Reconciling the Two Profit Figures

The absorption statement reports a profit £4,000 higher than the marginal statement. The difference arises entirely from the 500 units carried in closing inventory. Under absorption costing, each of those units carries £8.00 of fixed production overhead forward to the next period, so £4,000 of fixed cost (500 × £8) is held in the balance sheet rather than charged against this quarter’s profit. Under marginal costing the whole £40,000 of fixed overhead is expensed immediately, which is why its profit is lower. When inventory rises, absorption costing reports the higher profit; when inventory falls, the relationship reverses; and when production equals sales the two methods agree (Weetman, 2019).

Table 4: Reconciliation of profit (£)

For internal decision-making, many writers prefer marginal costing because contribution, the difference between sales and variable cost, responds directly to changes in volume and is not distorted by inventory movements (Seal et al., 2018). Absorption costing, however, remains necessary for external financial statements, since accounting standards require inventory to be valued at full production cost. A small manufacturer therefore benefits from understanding both.

Part 2: The Flexed Budget and Variance Analysis

Having established the costing framework, the second task compares budgeted performance with actual results. The original budget was built around the normal activity level of 5,000 planters. In the event, the company produced and sold only 4,800. Comparing actual costs against a budget set for 5,000 units would be misleading, because lower output should naturally incur lower variable costs. The solution is to flex the budget, restating it for the volume actually achieved so that like is compared with like (Atrill and McLaney, 2019). Fixed costs are not flexed, since by definition they do not change with activity across the relevant range.

Flexing rests on an important assumption: that each cost behaves in a predictable way, variable costs rising in direct proportion to output and fixed costs holding steady. In reality this linearity only holds within a relevant range of activity. A large increase in volume might, for example, require a second supervisor or additional factory space, converting what looked like a fixed cost into a stepped one. For a swing of 200 units around a 5,000-unit plan the assumption is reasonable, but a student should always state it rather than leave it implicit, because the credibility of every variance that follows depends upon it (Proctor, 2012).

From Fixed Budget to Flexed Budget

Each planter was budgeted to earn a contribution of £21, being the £45 selling price less £24 of variable cost (£12 materials, £7 labour, £3 variable production overhead and £2 variable selling overhead). The flexed budget simply multiplies the per-unit figures by 4,800, while fixed costs of £55,000 remain unchanged. The actual results are shown alongside for comparison.

Table 5: Fixed budget, flexed budget and actual results (£)

The comparison reveals a two-stage story. First, selling 200 fewer units than planned reduced expected profit from £50,000 to £45,800. This £4,200 shortfall is the sales volume variance, calculated as 200 units lost multiplied by the standard contribution of £21 per unit. It is shown by moving from the original budget to the flexed budget. Second, the flexed budget profit of £45,800 was further eroded to an actual profit of £36,490 by a series of price and efficiency differences. These operating variances are isolated below.

Calculating the Cost and Revenue Variances

Each variance measures the gap between what the actual activity of 4,800 units should have cost or earned and what it actually did. A favourable (F) variance improves profit; an adverse (A) variance reduces it. The workings are as follows.

• Sales price variance: (£44.00 actual price − £45.00 standard) × 4,800 units = £4,800 A. The company accepted an average price £1 below plan.
• Material price variance: (£3.00 − £3.10) × 19,700 kg used = £1,970 A. Steel was bought at £3.10 per kg rather than the standard £3.00.
• Material usage variance: (19,200 kg standard for 4,800 units − 19,700 kg actual) × £3.00 = £1,500 A. The factory used 500 kg more steel than the standard allowed.
• Labour rate variance: (£14.00 − £14.40) × 2,350 hours = £940 A. The actual wage rate exceeded standard.
• Labour efficiency variance: (2,400 hours standard − 2,350 hours actual) × £14.00 = £700 F. The workforce completed the output in fewer hours than expected.
• Variable overhead expenditure variance: (2,350 hours × £6.00) − £14,250 actual = £150 A.
• Variable overhead efficiency variance: (2,400 − 2,350 hours) × £6.00 = £300 F, mirroring the labour efficiency gain.
• Variable selling overhead variance: £9,600 standard − £9,850 actual = £250 A.
• Fixed production overhead expenditure variance: £40,000 budget − £41,200 actual = £1,200 A.
• Fixed selling and administration variance: £15,000 budget − £14,500 actual = £500 F.

Table 6: Operating statement reconciling flexed budget to actual profit (£)

The operating statement ties the analysis together. Starting from the flexed budget profit of £45,800, a net adverse variance of £9,310 explains the fall to the actual profit of £36,490. Because the statement reconciles exactly, it provides a reliable audit trail from plan to outcome, which is the central purpose of a standard costing system (Drury, 2021).

Part 3: Interpreting the Workings for Management

Numbers only become useful when they prompt questions. The largest single item is the sales price variance of £4,800 adverse, suggesting that the company discounted its planters, perhaps to defend market share against competitors. Yet volume still fell 200 units short of budget, so the discount did not protect sales. Management should ask whether the price reduction was a deliberate strategy or an unplanned response to pressure, and whether a modest price cut was ever likely to stimulate demand for a product bought largely on seasonal need. Taken with the adverse sales volume variance, the revenue side of the business clearly underperformed, and this is where the greatest value lies.

On the cost side, the material variances deserve attention. The adverse price variance of £1,970 indicates that steel cost more than the standard assumed, which may reflect a genuine market price rise rather than poor buying; if so, the standard itself should be updated so that future comparisons remain meaningful (Horngren, Datar and Rajan, 2015). The adverse usage variance of £1,500 is more concerning, because it points to 500 kg of avoidable waste. This could stem from lower-grade steel, a machine setting problem or operator error, and it is worth noting that cheaper or inferior material often causes exactly this kind of wastage, linking the two variances together. Investigating the cause is more productive than treating each variance in isolation.

The labour position is mixed but, on balance, encouraging. Although the rate variance was £940 adverse, perhaps because overtime or higher-grade staff were used, the workforce was more efficient than standard, saving 50 hours and generating a favourable efficiency variance of £700, with a matching £300 saving on variable overhead that is absorbed on labour hours. A plausible interpretation is that paying slightly more for experienced operators produced faster, and possibly higher-quality, work. Finally, the £1,200 overspend on fixed production overhead should be examined against the specific cost that rose, while the £500 saving on administration is a minor favourable item. Managers are generally advised to apply the principle of management by exception, concentrating scarce investigation time on the largest and most controllable variances rather than on every small deviation (Collis, Holt and Hussey, 2017).

Variance analysis has limits that a good answer should acknowledge. A variance identifies a symptom, not a cause; it signals where to look rather than what to do, and acting on the figures without investigation can be misleading. Standards may also become outdated as prices and methods change, so an adverse result can reflect a stale benchmark rather than poor performance. There is a behavioural dimension too, because an excessive focus on favourable cost variances can tempt managers to buy cheaper materials or rush work in ways that damage quality and morale (Bhimani et al., 2019). The figures are therefore a starting point for enquiry, not a substitute for managerial judgement.

The costing analysis in Part 1 complements this interpretation. Because marginal costing isolates contribution, it is the more suitable basis for the short-term decisions a small manufacturer faces, such as whether to accept a one-off order at a reduced price or how many units must be sold to break even. With a contribution of £21 per planter and fixed costs of £55,000, Pennine Planters must sell roughly 2,620 units simply to cover its fixed costs, a figure that frames how much risk any further price discounting carries (Dyson and Franklin, 2020). Absorption costing remains essential for valuing inventory in the statutory accounts, but it would be an unreliable guide to the pricing and volume decisions highlighted by the variances.

Conclusion

This assignment has shown how a small manufacturer can move from raw cost data to informed management decisions. Part 1 demonstrated that absorption and marginal costing differ only in the treatment of fixed overhead, that the difference in reported profit is fully explained by the fixed cost held in inventory, and that each method suits a different purpose. Part 2 built a flexed budget so that actual performance could be compared fairly with expectation, then decomposed the shortfall into a sales volume variance and a set of operating variances that reconciled precisely to the actual result. Part 3 interpreted those figures, arguing that the revenue variances and the material usage variance warrant the closest attention, and that the standard itself may need revising where prices have moved. The overarching lesson is that management accounting delivers value only when clear workings are paired with thoughtful commentary, so that the owners of a business such as Pennine Planters understand not merely what happened, but why, and what to do next.

References

Atrill, P. and McLaney, E. (2019) Management Accounting for Decision Makers. 9th edn. Harlow: Pearson.

Bhimani, A., Horngren, C.T., Datar, S.M. and Rajan, M.V. (2019) Management and Cost Accounting. 7th edn. Harlow: Pearson.

CIMA (2005) CIMA Official Terminology. Oxford: Elsevier.

Collis, J., Holt, A. and Hussey, R. (2017) Business Accounting. 3rd edn. London: Palgrave.

Drury, C. (2021) Management and Cost Accounting. 11th edn. Andover: Cengage Learning.

Dyson, J.R. and Franklin, E. (2020) Accounting for Non-Accounting Students. 10th edn. Harlow: Pearson.

Horngren, C.T., Datar, S.M. and Rajan, M.V. (2015) Cost Accounting: A Managerial Emphasis. 15th edn. Harlow: Pearson.

Proctor, R. (2012) Managerial Accounting: Decision Making and Performance Improvement. 4th edn. Harlow: Pearson.

Seal, W., Rohde, C., Garrison, R.H. and Noreen, E.W. (2018) Management Accounting. 6th edn. London: McGraw-Hill Education.

Upchurch, A. (2002) Cost Accounting: Principles and Practice. Harlow: Financial Times Prentice Hall.

Weetman, P. (2019) Management Accounting. 3rd edn. Harlow: Pearson.