What happens to unabsorbed fixed overheads when actual output is below normal capacity?

- Variable overheads: Allocated to each unit based on actual use. When output is low, each unit absorbs less; when output is high, each unit absorbs more. The rate moves with volume. - Fixed overheads: Allocated at a predetermined rate based on normal capacity. The per-unit charge stays consistent regardless of whether the factory runs at 60% or 95%. - Unallocated fixed overheads: When actual production is abnormally low, the overhead rate based on normal capacity will leave a portion of fixed costs unabsorbed. That unallocated portion is recognised as an expense in the period, not carried forward in inventory. This treatment is reinforced by IAS 2.38, which confirms that unallocated production overheads are expensed in the period in which they are incurred — they do not migrate into the balance sheet. Practical example: A factory has normal capacity of 10,000 units per month and fixed overheads of $100,000. The fixed overhead absorption rate is $10/unit. In a month where only 7,000 units are produced, $70,000 is absorbed into inventory. The remaining $30,000 is expensed immediately — it cannot be deferred by arguing that output will recover next month.

How is normal capacity defined and estimated under IAS 2?

The broader cost framework starts with IAS 2.6, which requires inventory cost to comprise all costs of purchase, costs of conversion, and other costs incurred in bringing inventories to their present location and condition. Overhead absorption sits within the conversion cost component. - Using actual capacity instead of normal capacity — allocating fixed overheads on actual output inflates unit cost in low-production periods and understates it when production is high. IAS 2 explicitly rejects this approach for fixed overheads. - Treating all unabsorbed overheads as an inventory adjustment — period-end reconciliations that push unabsorbed variances back into closing inventory are inconsistent with the standard. - Capitalising abnormal costs — IAS 2.16 is clear that abnormal amounts of wasted materials, labour, or other production costs are excluded from inventory cost and expensed immediately. - Forgetting non-production overheads — IAS 2.15 permits inclusion of non-production overheads in inventory cost only where they are genuinely incurred in bringing inventory to its present location and condition (for example, costs of designing products for specific customers). General administrative overheads do not qualify. - Inconsistent normal capacity estimates — switching the normal capacity base between periods without justification undermines comparability and may signal earnings management. - IAS 2.6 — Establishes the three-component cost model: costs of purchase, costs of conversion, and other costs. - IAS 2.12 — Core rule for conversion costs; requires systematic allocation of fixed overheads at normal capacity and variable overheads at actual use. - IAS 2.15 — Permits certain non-production overheads in inventory cost where directly linked to bringing goods to their present condition. - IAS 2.16 — Lists costs excluded from inventory, including abnormal production costs, storage costs (in most cases), and administrative overheads unrelated to production. - IAS 2.38 — Confirms that unallocated production overheads are recognised as a period expense, not deferred in inventory.

IAS 2 Overhead Absorption and Normal Capacity

IAS 2 Overhead Absorption and Normal Capacity — Core Rule

Production overheads must be allocated to inventory cost using a normal capacity base — not actual output. Fixed production overheads are allocated based on the normal capacity of production facilities, so that abnormal idle capacity costs never inflate the carrying amount of inventory. This is one of the most frequently misapplied requirements in manufacturing accounting.

Under IAS 2.12, costs of conversion include a systematic allocation of both fixed and variable production overheads incurred in converting materials into finished goods. Fixed overheads — indirect costs that remain relatively constant regardless of volume — must be allocated based on normal capacity. Variable overheads are allocated based on actual use of production facilities.

How IAS 2 Overhead Absorption and Normal Capacity Works

Normal capacity is the production level expected to be achieved on average over a number of periods under normal circumstances, accounting for planned maintenance downtime. It is not a theoretical maximum.

The allocation mechanism works as follows:

Variable overheads: Allocated to each unit based on actual use. When output is low, each unit absorbs less; when output is high, each unit absorbs more. The rate moves with volume.
Fixed overheads: Allocated at a predetermined rate based on normal capacity. The per-unit charge stays consistent regardless of whether the factory runs at 60% or 95%.
Unallocated fixed overheads: When actual production is abnormally low, the overhead rate based on normal capacity will leave a portion of fixed costs unabsorbed. That unallocated portion is recognised as an expense in the period, not carried forward in inventory.

This treatment is reinforced by IAS 2.38, which confirms that unallocated production overheads are expensed in the period in which they are incurred — they do not migrate into the balance sheet.

Practical example: A factory has normal capacity of 10,000 units per month and fixed overheads of $100,000. The fixed overhead absorption rate is $10/unit. In a month where only 7,000 units are produced, $70,000 is absorbed into inventory. The remaining $30,000 is expensed immediately — it cannot be deferred by arguing that output will recover next month.

The broader cost framework starts with IAS 2.6, which requires inventory cost to comprise all costs of purchase, costs of conversion, and other costs incurred in bringing inventories to their present location and condition. Overhead absorption sits within the conversion cost component.

IAS 2 Overhead Absorption and Normal Capacity — Common Pitfalls

Using actual capacity instead of normal capacity — allocating fixed overheads on actual output inflates unit cost in low-production periods and understates it when production is high. IAS 2 explicitly rejects this approach for fixed overheads.

Treating all unabsorbed overheads as an inventory adjustment — period-end reconciliations that push unabsorbed variances back into closing inventory are inconsistent with the standard.
Capitalising abnormal costs — IAS 2.16 is clear that abnormal amounts of wasted materials, labour, or other production costs are excluded from inventory cost and expensed immediately.
Forgetting non-production overheads — IAS 2.15 permits inclusion of non-production overheads in inventory cost only where they are genuinely incurred in bringing inventory to its present location and condition (for example, costs of designing products for specific customers). General administrative overheads do not qualify.
Inconsistent normal capacity estimates — switching the normal capacity base between periods without justification undermines comparability and may signal earnings management.

IAS 2 Overhead Absorption and Normal Capacity — Key Paragraphs

IAS 2.6 — Establishes the three-component cost model: costs of purchase, costs of conversion, and other costs.
IAS 2.12 — Core rule for conversion costs; requires systematic allocation of fixed overheads at normal capacity and variable overheads at actual use.
IAS 2.15 — Permits certain non-production overheads in inventory cost where directly linked to bringing goods to their present condition.
IAS 2.16 — Lists costs excluded from inventory, including abnormal production costs, storage costs (in most cases), and administrative overheads unrelated to production.
IAS 2.38 — Confirms that unallocated production overheads are recognised as a period expense, not deferred in inventory.

IAS 2 Overhead Absorption and Normal Capacity

How are production overheads allocated to inventory cost under IAS 2?

IAS 2 Overhead Absorption and Normal Capacity — Core Rule

How IAS 2 Overhead Absorption and Normal Capacity Works

IAS 2 Overhead Absorption and Normal Capacity — Common Pitfalls

IAS 2 Overhead Absorption and Normal Capacity — Key Paragraphs