Accounting Paper 1 Topic 23: Marginal & Absorption Statements of Profit or Loss

The difference in reported profit arises solely from the treatment of fixed production overheads. Marginal costing treats fixed overheads as period costs written off immediately in the profit or loss statement. Absorption costing treats fixed overheads as product costs, absorbing them into unit costs and carrying a portion forward in closing inventory to future periods.

Absorption costing profit is higher than marginal costing profit whenever production exceeds sales during an accounting period. In this scenario, closing inventory is greater than opening inventory, meaning a portion of fixed production overheads is deferred within closing inventory on the balance sheet rather than expensed in the current income statement.

Marginal costing profit is higher when sales exceed production during an accounting period. Here, closing inventory is lower than opening inventory, meaning opening inventory containing previously deferred fixed overheads from earlier periods is released and expensed against current revenue under absorption costing, reducing absorption profit below marginal profit.

The reconciliation formula is: Profit Difference = (Closing Inventory Units - Opening Inventory Units) x Fixed Overhead Absorption Rate per Unit. Adding this difference to marginal costing profit gives absorption costing profit (Absorption Profit = Marginal Profit + Change in Inventory x OAR).

When production volume equals sales volume during a period, opening inventory equals closing inventory. In this situation, the amount of fixed production overhead charged against revenue is identical under both methods, resulting in exactly equal reported profits for marginal costing and absorption costing.

Under marginal costing, inventory is valued strictly at variable manufacturing cost (direct materials + direct labour + variable production overheads). Under absorption costing, inventory is valued at full manufacturing cost, including both variable production costs and an absorbed share of fixed production overheads based on the predetermined absorption rate.

Marginal costing avoids arbitrary overhead apportionments and prevents profit distortion caused by fluctuating production volumes and inventory build-up. Contribution analysis highlights the exact incremental revenue generated by each unit sold, making it clearer for management to evaluate pricing, special orders, and product line viability.

Common student mistakes include confusing which method reports higher profit when inventory rises or falls, applying the total overhead rate instead of only the fixed overhead absorption rate when reconciling profits, forgetting that selling and administrative overheads are always treated as period costs under both methods, and miscalculating inventory changes.

Typically, 1 to 2 multiple-choice questions appear on marginal versus absorption costing and profit reconciliations in Cambridge Paper 1. Because these questions follow predictable formulaic steps, mastering the inventory reconciliation equation provides reliable marks under exam conditions.

Yes. This topical past paper compiles authentic Cambridge International A Level Accounting Paper 1 MCQs on Marginal & Absorption Statements of Profit or Loss from 1999 to 2024. It is completely free to preview and download in PDF format with complete answer keys for independent revision.