A systematic method for assigning indirect (overhead) costs to specified cost objects (products, departments, projects) by applying an explicit allocation base and rule so that the pooled indirect costs are fully apportioned for managerial measurement or external reporting; direct costs are recorded by direct tracing and are excluded from allocation.

Principle

The chosen allocation rule should reflect a causal, benefit, or usage relationship between the cost pool and the cost objects because allocation changes measured cost and therefore influences pricing, performance measurement and resource decisions.

Demonstration

Illustrative scenario — Situation: Factory overhead pool = $100,000; allocation base = total machine hours (10,000 hours). Recognition: Product A uses 2,000 machine hours. Action: Allocate overhead to Product A = $100,000 × (2,000/10,000) = $20,000. Consequence: Product A’s unit cost includes that $20,000 share, informing price setting and margin analysis.

Misapplication

Selecting an allocation base for convenience (e.g., equal split) rather than any causal link yields distorted product or departmental costs; another error is allocating costs that are in fact directly traceable, which double-counts or misstates true cost behavior.

Consequence

A methodologically consistent allocation produces comparable internal cost measures and supports decisions on pricing, product mix, and investment; incorrect allocation distorts margins, can misdirect investments or incentives, and may produce unreliable external disclosures when used improperly.

Reversal

When costs are directly traceable to a single object they should not be apportioned; statutory or contract rules may mandate specific allocation methods that supersede managerial choices; when decisions require marginal or incremental cost, full-cost allocation can be misleading.

Boundary

Clearly within: apportioning factory overhead to manufactured products using machine hours. Boundary case: allocating corporate HQ costs to divisions — appropriateness depends on whether a measurable benefit or usage relationship exists and on the decision purpose. Clearly outside: market-based pricing set independently of internally allocated overhead.

Semantic Tension

Accuracy (reflecting causal relationships) ↔ Simplicity and administrative cost (feasibility of measuring drivers).

Synthesis

Cost allocation does not assert causal economics but imposes a measurement rule: it distributes pooled indirect costs according to an explicit basis, so the method must be chosen to match the decision or reporting objective because different bases yield different, equally defensible cost numbers.