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Product Costing Methods Comparison Reference

Choosing a costing method changes reported profit, inventory value and the prices you quote. This table compares the main manufacturing methods on what they include, whether they can be used externally and where each one misleads.

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Method	Costs in product	External reporting	Best for	Main weakness
Absorption (full) costing	Direct material, direct labor, variable and fixed manufacturing overhead	Required under US GAAP and IFRS (IAS 2)	Financial statements and tax	Profit moves with production volume as fixed overhead shifts into inventory
Variable (direct) costing	Direct material, direct labor, variable overhead only	Not acceptable for external statements	Internal contribution analysis and short-term decisions	Understates inventory and hides full cost in pricing
Throughput (supercosting)	Direct material only; labor and overhead are period costs	Not acceptable for external statements	Theory of Constraints bottleneck decisions	Ignores real conversion cost over longer horizons
Activity-based costing (ABC)	Overhead assigned through activity cost drivers	Acceptable if it yields full absorption cost	Complex product mixes with diverse overhead use	Costly to maintain and needs reliable driver data
Standard costing	Predetermined standard material, labor and overhead	Acceptable if standards approximate actual cost (IAS 2)	Repetitive production and variance control	Stale standards distort margin and inventory value
Actual costing	Actual material, labor and overhead of the period	Acceptable	Custom, low-volume or cost-plus contract work	Unit cost fluctuates with period volume and timing
Normal costing	Actual material and labor plus overhead applied at a predetermined rate	Acceptable with period-end adjustment	Smoothing overhead across uneven months	Needs under and over absorption clean-up
Job order costing	Costs accumulated per job or work order	Acceptable	Job shops, aerospace parts, custom machinery	Heavy transaction capture and job close discipline
Process costing (weighted average)	Costs accumulated per department, averaged over equivalent units	Acceptable	Continuous, homogeneous output such as chemicals	Beginning WIP costs blend into current period
Process costing (FIFO)	Current period costs separated from beginning WIP	Acceptable	Processes needing period cost control	More complex equivalent unit calculations
Target costing	Allowable cost derived from market price minus required margin	Management tool, not an accounting basis	New product design with fixed price points	Needs strong cross-functional discipline
Lean accounting (value stream costing)	Costs grouped by value stream, often with simplified inventory	Needs reconciliation to GAAP or IFRS	Lean plants with low inventory	Requires adjustments for statutory reporting
Backflush costing	Costs flushed at completion or sale using standard bills of material	Acceptable if WIP is immaterial	Just-in-time, short cycle production	Weak audit trail within the production cycle

Summary guidance only. IAS 2 and ASC 330 both require the cost of inventory to include conversion costs allocated on normal capacity. Confirm treatment with your auditor.

Costing method fit review

Optional: a short review of which costing method fits your product mix and ERP.

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How to use the comparison

Start with the reporting purpose. If you need statutory accounts, use the external column to filter to methods that produce full absorption cost. If you are deciding whether to accept an order, variable and throughput views are useful internally. Most plants run one method for the ledger and a second view for decisions, and the key is to reconcile them each period.

Absorption versus variable

Under absorption costing, fixed overhead is attached to each unit produced, so units left in inventory carry a share of it. Under variable costing, fixed overhead is expensed in the period. When production exceeds sales, absorption profit is higher; when sales exceed production, it is lower. This single difference explains most arguments between operations and finance about a good or bad month.

When ABC and standards earn their cost

Activity-based costing pays off when overhead is large and products consume it unevenly, for example high-mix electronics with varied setups. Standard costing pays off when production is repetitive and variances can be acted on. In both cases the quality of drivers and standards matters more than the method name.

Common mistakes

Using variable costing figures in the statutory accounts, never updating standards, allocating overhead on direct labor hours when automation dominates, and comparing job cost across periods without adjusting for abnormal scrap or idle capacity.

Frequently Asked Questions

Which costing method does IFRS require?

IAS 2 requires inventory cost to include direct costs and a systematic allocation of fixed and variable production overhead, based on normal capacity. That is absorption costing, although standard or retail methods are allowed if they approximate cost.

Why do profits differ between absorption and variable costing?

Fixed overhead is deferred in inventory under absorption costing but expensed immediately under variable costing. Profit differs by the change in inventory units times the fixed overhead per unit.

Is throughput costing allowed for financial statements?

No. Throughput costing treats labor and overhead as period costs, so it understates inventory and does not meet IAS 2 or ASC 330. It is used internally to manage bottlenecks.

What is the difference between normal and standard costing?

Normal costing uses actual material and labor with predetermined overhead rates. Standard costing uses predetermined values for all three and records variances against them.

If your ERP costing set-up does not match the method you think you run, we can help review the configuration.

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