Should a product's cost include a share of fixed overhead, and how does that choice change reported profit and decisions?
Distinguish marginal and absorption costing, calculate profit under each method and reconcile the difference, and apply cost-volume-profit analysis - contribution, break-even point, margin of safety and target profit.
A focused answer to the SQA Advanced Higher Accounting requirement on marginal and absorption costing, covering the difference between the two methods, why reported profit differs and how to reconcile it, and cost-volume-profit analysis including contribution, break-even, margin of safety and target profit.
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
The SQA wants you to understand the two ways a business can treat fixed overhead when costing a product, calculate profit under each, reconcile the difference, and use the marginal-costing idea of contribution for cost-volume-profit (CVP) analysis. This topic underpins decision making and is examined both numerically and in written justification.
The two methods
The whole topic turns on one question: does a product's cost include fixed overhead?
Marginal costing is favoured for decision making because it isolates the costs that actually change with output. Absorption costing is required for external reporting under IAS 2, because inventory must include a share of production overhead. Knowing which method a question or context calls for is itself examinable.
Why profit differs and how to reconcile it
The profit difference comes entirely from how fixed overhead in inventory is treated.
The intuition is that absorption costing parks fixed overhead in the closing inventory on the statement of financial position, deferring it to a later period, whereas marginal costing expenses it all now. The reconciliation is a frequent exam requirement and a quick win once the rule is automatic.
Cost-volume-profit analysis
CVP analysis uses contribution to answer planning questions about output, cost and profit.
Contribution is the engine: each unit sold above break-even contributes its full contribution to profit, because fixed costs are already covered. The margin of safety measures risk - how far sales can fall before the firm makes a loss - and a break-even chart plots total cost and total revenue to show the break-even point and the profit or loss at any output.
Why this matters later
Contribution from marginal costing is the key input to the decision-making topic, where limiting factors, special orders and make-or-buy choices all rest on contribution rather than absorbed cost. Absorption costing connects back to the financial accounting area, because IAS 2 requires inventory to carry production overhead. Knowing when each method applies, and being able to reconcile them, is the bridge between costing and decisions.
Try this
Q1. Selling price is GBP 30, variable cost is GBP 18 and fixed costs are GBP 72,000. Find the break-even point in units. [3 marks]
- Cue. Contribution ; break-even units.
Q2. Production is 5,000 units, sales are 5,500 units and fixed overhead is absorbed at GBP 6 per unit. State which method gives the higher profit and the difference. [3 marks]
- Cue. Inventory falls by 500, so marginal profit is higher by .
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AH style: break-even6 marksA product sells for GBP 40, has variable costs of GBP 24 per unit, and the firm has fixed costs of GBP 96,000. Calculate the break-even point in units, and the margin of safety if budgeted sales are 8,000 units.Show worked answer →
Contribution per unit is (1 mark). Break-even in units is fixed costs divided by contribution per unit: units (3 marks).
Margin of safety is budgeted sales less break-even sales: units, or as a percentage (2 marks). Markers reward the contribution per unit, the break-even formula, and the margin of safety expressed in units or as a percentage.
AH style: profit reconciliation6 marksFixed overhead is absorbed at GBP 5 per unit. Production was 10,000 units and sales were 9,000 units, so closing inventory rose by 1,000 units. State which method reports the higher profit and by how much, and explain why.Show worked answer →
When production exceeds sales, inventory rises, and absorption costing carries fixed overhead into the closing inventory rather than charging it all to the period (2 marks).
The difference is the change in inventory multiplied by the fixed overhead per unit: (2 marks). Absorption costing therefore reports the higher profit, by GBP 5,000, because GBP 5,000 of fixed overhead is held in inventory instead of expensed (2 marks). Markers reward identifying absorption as higher, the GBP 5,000 difference, and the inventory explanation.
Related dot points
- Apply relevant costing to short-term decisions - special order pricing, make-or-buy, the use of a limiting factor, and discontinuing a product - identifying relevant and irrelevant costs and ranking options by contribution.
A focused answer to the SQA Advanced Higher Accounting decision-making content, covering relevant and irrelevant costs, special order pricing, make-or-buy decisions, allocating a limiting factor by contribution per unit of the scarce resource, and the decision to discontinue a product.
- Calculate the cost of output using job costing for one-off or batch work and process costing for continuous production, including the treatment of equivalent units, normal loss, abnormal loss and abnormal gain.
A focused answer to the SQA Advanced Higher Accounting costing methods, covering job and batch costing for one-off work, process costing for continuous production, equivalent units for closing work in progress, and the treatment of normal loss, abnormal loss and abnormal gain.
- Calculate and interpret cost variances - direct material price and usage, direct labour rate and efficiency, variable and fixed overhead variances, and sales variances - and reconcile budgeted profit or cost to actual through a statement of variances.
A focused answer to the SQA Advanced Higher Accounting standard costing and variance analysis, covering the material price and usage variances, labour rate and efficiency variances, variable and fixed overhead variances, sales variances, and how variances reconcile budget to actual and are interpreted for control.
- Prepare a cash budget and supporting functional budgets, explain the purpose and benefits of budgeting and budgetary control, and use a flexible budget to compare actual results with a budget adjusted to the activity level achieved.
A focused answer to the SQA Advanced Higher Accounting budgeting content, covering the preparation of a cash budget and functional budgets, the purpose and benefits of budgetary control, and the use of flexible budgets to compare actual performance against a budget flexed to the actual activity level.
- Appraise a capital investment using the payback period, the accounting rate of return, net present value and the internal rate of return, recognising the role of the time value of money and the strengths and limitations of each method.
A focused answer to the SQA Advanced Higher Accounting investment appraisal content, covering the payback period, the accounting rate of return, net present value and the internal rate of return, the time value of money behind discounting, and the strengths and limitations of each technique.
Sources & how we know this
- SQA Advanced Higher Accounting Course Specification — SQA (2025)