Attributing Costs to Organisational Requirements
Allocating and apportioning overheads, reapportioning service departments, calculating absorption rates and attributing costs to products or services.
How to study AAT Level 3
Move from verified source data to controlled calculations, reconcile the accounting result, test its business meaning and communicate it with the ethical and technical care expected at Level 3.
Core concepts
Concept 1
Allocation assigns an entire cost to one cost centre, while apportionment shares a common cost using a suitable basis.
Exam cue: Choose an apportionment basis that reflects the way the resource is consumed.
Concept 2
Service-cost-centre overhead may be reapportioned to production cost centres before absorption into cost units.
Exam cue: Complete allocation, primary apportionment and service-centre reapportionment before calculating absorption rates.
Concept 3
An overhead absorption rate applies budgeted overhead through a relevant activity base such as labour hours, machine hours or units.
Exam cue: Compare absorbed overhead with actual overhead to identify under- or over-absorption.
Risk pitfalls and guardrails
Using floor area to apportion every overhead without considering causation.
Guardrail: Do not rely on a familiar formula, rate or policy until you have confirmed the period, source data, calculation basis and current technical scope.
Absorbing a service department's costs directly into products before reapportionment where the method requires it.
Guardrail: Do not rely on a familiar formula, rate or policy until you have confirmed the period, source data, calculation basis and current technical scope.
Calculating an absorption rate from actual output when the task specifies budgeted activity.
Guardrail: Do not rely on a familiar formula, rate or policy until you have confirmed the period, source data, calculation basis and current technical scope.
Memory anchors
Allocation
Allocation assigns a whole overhead item directly to one cost centre.
Apportionment
Apportionment shares a common overhead between cost centres using a suitable basis.
Reapportionment
Reapportionment transfers service-cost-centre overhead to production cost centres.
Absorption Rate
An absorption rate divides budgeted overhead by the relevant budgeted activity base.
Under-absorption
Under-absorption occurs when overhead absorbed is less than actual overhead incurred.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Factory rent relates to two production departments. What is the most suitable apportionment basis?
Canteen cost is to be apportioned among departments. Which basis is most suitable?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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