Why is "Using the full (absorption) cost for a short-term decision" a common mistake in Uses & Limitations of Absorption Costing?

Why it happens: Treating fixed overhead as if it changes with the decision. How to avoid it: For special orders, make-or-buy and drop-a-product, compare on CONTRIBUTION — fixed costs are unchanged. Source: 9706 Examiner Reports

Why is "Listing uses/limitations without applying them" a common mistake in Uses & Limitations of Absorption Costing?

Why it happens: Memorising bullet points. How to avoid it: Apply each point to the scenario and, for discuss questions, give a two-sided answer with a supported conclusion. Source: 9706 Examiner Reports

Why is "Valuing inventory at marginal cost for the accounts" a common mistake in Uses & Limitations of Absorption Costing?

Why it happens: Confusing management and financial accounting. How to avoid it: IAS 2 requires inventory at FULL production cost (absorption), not variable cost — for the published accounts. Source: 9706 Examiner Reports

Why is "Getting the profit difference the wrong way round" a common mistake in Uses & Limitations of Absorption Costing?

Why it happens: Forgetting which method carries fixed cost in inventory. How to avoid it: Inventory RISES → absorption profit HIGHER (fixed cost carried forward); inventory falls → lower. Source: 9706 Examiner Reports

Why is "Presenting ABC as costless and always better" a common mistake in Uses & Limitations of Absorption Costing?

Why it happens: Focusing only on its accuracy. How to avoid it: ABC is more accurate where overhead is complex but is more COSTLY and time-consuming — weigh the trade-off. Source: 9706 Examiner Reports

Why is "Claiming one method is best for everything" a common mistake in Uses & Limitations of Absorption Costing?

Why it happens: Not linking method to purpose. How to avoid it: Match the method to the decision: absorption for accounts/long-run pricing, marginal for short-term decisions, ABC for accuracy. Source: 9706 Examiner Reports

Cambridge International A Levels Accounting (9706)

Uses & Limitations of Absorption Costing

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Detailed Study Notes

Detailed notes on Absorption Costing for Cambridge International A Levels Accounting, covering key concepts, explanations, examples, and exam-focused revision points.

Uses & Limitations of Absorption Costing — Cambridge AS & A Level Accounting 9706 Study Notes (2026-2028)

Evaluating absorption costing. Learn what absorption costing is used for (full cost, pricing, inventory valuation), its drawbacks (arbitrary apportionment, predetermined rates, unsuitability for short-term decisions), and how it compares with marginal costing and activity-based costing.

At a glance

Absorption costing charges all production costs (direct + a share of overhead) to each unit → a full cost.
Uses: pricing on full cost, valuing inventory at full production cost (IAS 2), measuring product profitability.
Required for the financial statements — inventory must include a share of production overhead.
Limitation 1: apportionment of overhead is arbitrary — the chosen basis is a judgement.
Limitation 2: uses predetermined rates → under/over-absorption.
Limitation 3: not ideal for short-term decisions — marginal costing (contribution) is better.
Activity-based costing (ABC) shares overhead by cost drivers for more accurate product costs.

What you’ll learn

Mapped to the Cambridge International A Level 9706 syllabus (2026-2028).

2.2.2 — Understand the uses of absorption costing (full cost, pricing, inventory valuation).
2.2.2 — Understand the limitations of absorption costing.
Compare absorption costing with marginal costing and outline activity-based costing.

What absorption costing does

Charges every unit with its direct costs plus a fair share of overhead — a full cost.

Absorption costing charges all production costs to cost units: the direct costs (materials, labour, expenses) plus a share of production overhead (absorbed via an overhead absorption rate). The result is a full (total) cost per unit.

It is built in the two stages you have studied:

Allocate, apportion and reapportion overheads into the production departments.
Absorb the departmental overhead into cost units using an OAR.

This contrasts with marginal costing, which charges units with only the variable cost and treats fixed overhead as a period cost (written off in full each period rather than carried in inventory).

Absorption costing = direct costs + a share of production overhead.
Gives a full (total) cost per unit.
Built by apportioning then absorbing overhead.
Marginal costing instead charges only variable cost to units.

See the full worked example for uses & limitations of absorption costing →

Uses (advantages)

Full-cost pricing, inventory valuation for the accounts, and product profitability.

Why businesses use absorption costing:

Full-cost pricing. A price set on the full cost ensures all costs (including overheads) are covered in the long run — useful for cost-plus pricing and quoting on jobs/contracts.
Inventory valuation (required). Under IAS 2, inventory must be valued at full production cost (including a share of production overhead). Absorption costing provides this figure, so it is required for the financial statements.
Profitability by product/department. It shows the full cost of each product, helping assess which products or departments are truly profitable once overheads are included.
Recognises overheads matter. It stops managers ignoring overheads — every unit is reminded it must carry its share.

Full-cost pricing ensures all costs are covered long-term.
Required for inventory valuation under IAS 2 (full production cost).
Shows full cost and profitability by product/department.
Forces overheads to be recognised in unit costs.

See the full worked example for uses & limitations of absorption costing →

Limitations

Arbitrary apportionment, predetermined rates, and poor for short-term decisions.

Drawbacks of absorption costing:

Arbitrary apportionment. The basis chosen to share overheads is a judgement; a different basis gives a different unit cost. This makes the full cost subjective and potentially distorted.
Predetermined rates → under/over-absorption. Because rates are set from budgets, the overhead absorbed rarely equals the actual overhead, producing an under- or over-absorption adjustment.
Poor for short-term decisions. Including fixed overhead in unit cost can mislead decisions such as special orders, make-or-buy and discontinuing a product — here marginal costing (contribution) is better, because fixed costs do not change with the decision.
More complex than marginal costing, and can encourage over-production (making more units spreads fixed overhead and flatters reported profit).

Apportionment basis is arbitrary → subjective, possibly distorted, unit cost.
Predetermined rates cause under/over-absorption.
Including fixed overhead misleads short-term decisions (use contribution).
More complex; can encourage over-production to flatter profit.

See the full worked example for uses & limitations of absorption costing →

Comparison with marginal costing and ABC

Marginal costing suits short-term decisions; ABC shares overhead more accurately.

Absorption vs marginal costing:

	Absorption costing	Marginal costing
Unit cost includes	Direct + share of fixed overhead	Variable cost only
Fixed overhead	Carried in inventory, absorbed	Period cost, written off in full
Best for	Inventory valuation, full-cost pricing	Short-term decisions (contribution)
Profit if inventory rises	Higher (fixed cost carried forward)	Lower

Activity-based costing (ABC). ABC shares overhead using cost drivers (the activities that actually cause cost — e.g. number of set-ups, orders, inspections) rather than a single volume-based rate. It gives more accurate product costs where overheads are complex and not volume-driven, but is more costly and time-consuming to operate.

Evaluation. No method is 'best' for everything: absorption costing is needed for the accounts and long-run pricing; marginal costing is better for short-term decisions; ABC improves accuracy when overheads are diverse. A good answer recommends the method that fits the decision.

Marginal costing: variable cost only; best for short-term decisions.
Absorption costing: full cost; needed for accounts and long-run pricing.
Rising inventory → absorption profit higher than marginal profit.
ABC shares overhead by cost drivers — more accurate but more costly.

Quick recap

Absorption costing charges each unit with direct costs + a share of production overhead (full cost).
Uses: full-cost pricing, inventory valuation (IAS 2, required), product profitability.
Limitations: arbitrary apportionment, predetermined rates (under/over-absorption), poor for short-term decisions.
Marginal costing (contribution) is better for short-term decisions.
ABC shares overhead by cost drivers — more accurate but more costly.
Recommend the costing method that fits the decision being made.

Memorise this

Verbatim phrases and definitions Cambridge mark schemes credit.

Absorption costing = full cost (direct + share of overhead); needed for inventory valuation and long-run pricing.
Limitations: arbitrary apportionment; under/over-absorption; misleads SHORT-TERM decisions.
Short-term decisions → use marginal costing (contribution); fixed costs don't change.
Rising inventory → absorption profit > marginal profit (fixed cost carried forward).

How it’s examined

Tested on Paper 4, usually as a discuss/evaluate question: state the uses/limitations of absorption costing or advise which costing method to use for a decision (commonly [4-8] marks, sometimes a longer evaluation). Examiner reports reward two-sided answers with a supported recommendation, and penalise listing without application.

Sources: Cambridge International AS & A Level Accounting 9706 syllabus (2026-2028); 9706 Paper 4 past papers & mark schemes, 2022-2024; 9706 Examiner Reports, 2022-2024. Last reviewed 2026-06-18.

Take this whole topic with you

Step-by-step worked examples — Uses & Limitations of Absorption Costing

Step-by-step solutions to past-paper-style questions on uses & limitations of absorption costing, written exactly the way a tutor would explain them at the board.

Question type:

1What absorption costing is (3 marks)
Getting startedWord problem• 9706 Paper 4 style• absorption costing, AO1
Question
State what is meant by absorption costing and what cost it produces for each unit. (3 marks)
Step-by-step solution
1. Step 1
  Absorption costing charges each unit with its direct costs (materials, labour, expenses).
2. Step 2
  ...plus a share of production overhead, absorbed using an overhead absorption rate.
3. Step 3
  The result is a full (total) cost per unit.
Answer
It charges direct costs + a share of overhead to each unit, giving a full cost per unit.
Examiner tip
Contrast with marginal costing, which charges only the variable cost to units.
2Two uses of absorption costing (4 marks)
Getting startedWord problem• uses, AO1
Question
State two uses of absorption costing and briefly explain each. (4 marks)
Step-by-step solution
1. Step 1
  Pricing: a price set on the full cost ensures all costs (including overheads) are covered in the long run.
2. Step 2
  Inventory valuation: IAS 2 requires inventory at full production cost, which absorption costing provides — so it is needed for the financial statements.
Answer
Full-cost pricing (covers all costs) and inventory valuation at full production cost (IAS 2).
Examiner tip
Other valid uses: measuring product/department profitability; ensuring overheads are recovered.
3Why inventory must include overhead (4 marks)
Building confidenceWord problem• inventory valuation, AO2
Question
Explain why a manufacturer must value its closing inventory using absorption costing rather than marginal costing for its published accounts. (4 marks)
Step-by-step solution
1. Step 1
  IAS 2 requires inventory to be valued at the cost of bringing it to its present condition and location.
2. Step 2
  This includes a share of production overhead, not just the variable cost.
3. Step 3
  Marginal costing would value inventory at variable cost only, understating it.
4. Step 4
  So absorption costing (full production cost) is required for the financial statements.
Answer
IAS 2 requires inventory at full production cost (including overhead), which only absorption costing gives.
Examiner tip
The accounting standard, not management preference, drives the inventory valuation.
4The arbitrary-apportionment limitation (4 marks)
Building confidenceWord problem• limitations, AO3
Question
Explain why the apportionment of overheads is described as a limitation of absorption costing. (4 marks)
Step-by-step solution
1. Step 1
  Overheads are shared between departments using a chosen basis (floor area, machine value, etc.).
2. Step 2
  The choice of basis is a judgement — a different basis gives a different department and unit cost.
3. Step 3
  So the full cost is subjective and can be distorted.
4. Step 4
  A distorted unit cost can lead to mispricing of products.
Answer
Apportionment relies on a subjective choice of basis, so the full cost can be distorted, risking mispricing.
Examiner tip
This subjectivity is a key reason some firms adopt ABC.
5Why not for short-term decisions (5 marks)
StretchWord problem• limitations, decisions, AO3
Question
Explain why absorption costing can give the wrong answer for a short-term decision such as accepting a special order. (5 marks)
Step-by-step solution
1. Step 1
  Absorption costing includes a share of fixed overhead in the unit cost.
2. Step 2
  In the short term, fixed costs do not change with the decision — they are incurred anyway.
3. Step 3
  If the special-order price is judged against the full cost, it may be rejected even though it more than covers the variable cost.
4. Step 4
  The correct test is whether the price exceeds the variable cost, i.e. earns positive contribution.
5. Step 5
  So marginal costing (contribution) should be used for the decision, not the full cost.
Answer
Full cost includes unavoidable fixed overhead; short-term decisions should use contribution (marginal costing).
Examiner tip
Fixed costs are irrelevant to a short-term decision; only the changing (variable) costs matter.
6Full cost vs marginal cost (5 marks)
Building confidenceMulti-step problem• marginal costing, AO2
Question
A unit has direct materials $6, direct labour$ 4, variable overhead $2 and absorbs$ 5 of fixed overhead. State the marginal cost and the absorption (full) cost per unit, and which would be used to value inventory. (5 marks)
Step-by-step solution
1. Step 1
  Marginal cost = variable costs only = 6 + 4 + 2 = $12.
2. Step 2
  Absorption (full) cost = marginal cost + fixed overhead = 12 + 5 = $17.
3. Step 3
  Inventory is valued at the full cost ($17) for the financial statements (IAS 2).
Answer
Marginal cost $12; full cost$ 17; inventory valued at $17.
Examiner tip
Marginal cost excludes fixed overhead; full cost includes it.
7Why the two methods give different profit (5 marks)
StretchWord problem• marginal costing, AO3
Question
Explain why absorption costing and marginal costing can report different profits in a period, and when absorption profit is higher. (5 marks)
Step-by-step solution
1. Step 1
  Under absorption costing, fixed overhead is carried in inventory; under marginal costing it is written off in full each period.
2. Step 2
  If inventory increases, absorption costing carries some fixed overhead forward into closing inventory rather than charging it now.
3. Step 3
  So absorption profit is higher than marginal profit when inventory rises.
4. Step 4
  When inventory falls, the reverse happens and absorption profit is lower.
5. Step 5
  The difference = fixed overhead in the change in inventory.
Answer
Fixed overhead is carried in inventory under absorption; rising inventory → absorption profit higher (by fixed cost in the inventory change).
Examiner tip
Profit difference = fixed OAR × change in inventory units.
8Absorption costing vs ABC (5 marks)
StretchWord problem• ABC, AO3
Question
Explain one advantage and one disadvantage of activity-based costing (ABC) compared with traditional absorption costing. (5 marks)
Step-by-step solution
1. Step 1
  ABC shares overhead using cost drivers — the activities that actually cause cost (set-ups, orders, inspections).
2. Step 2
  Advantage: this gives more accurate product costs where overheads are complex and not driven by volume.
3. Step 3
  Disadvantage: ABC is more costly and time-consuming to set up and operate (identifying drivers, collecting data).
4. Step 4
  So ABC suits firms with diverse products and high, complex overheads; simpler firms may not justify the cost.
Answer
ABC gives more accurate costs (cost drivers) but is more costly/time-consuming than absorption costing.
Examiner tip
ABC improves accuracy where overhead is not volume-driven; weigh accuracy against cost.
9Advise which method to use (6 marks)
StretchWord problem• evaluation, AO3
Question
A manager must (a) value year-end inventory for the accounts and (b) decide whether to accept a one-off order below full cost. Advise which costing method to use for each, with reasons. (6 marks)
Step-by-step solution
1. Step 1
  (a) Inventory valuation: use absorption costing — IAS 2 requires inventory at full production cost including overhead.
2. Step 2
  (b) One-off order: use marginal costing — judge the order on contribution (price vs variable cost), since fixed costs are unchanged.
3. Step 3
  If the order earns positive contribution and there is spare capacity, accept it even below full cost.
4. Step 4
  Conclusion: different decisions need different methods — absorption for the accounts, marginal for the short-term decision.
Answer
(a) Absorption costing (IAS 2 inventory); (b) marginal costing (contribution on the one-off order).
Examiner tip
Match the method to the decision. Note any spare-capacity / non-financial caveats.
10Over-production risk (4 marks)
StretchWord problem• limitations, AO3
Question
Explain how absorption costing could tempt a manager to over-produce, and why this is a problem. (4 marks)
Step-by-step solution
1. Step 1
  Producing more units spreads the fixed overhead over more units and carries some in closing inventory.
2. Step 2
  This lowers the cost charged to this period and so flatters reported profit.
3. Step 3
  A manager rewarded on profit might over-produce to boost it.
4. Step 4
  The problem: it ties up cash in unsold inventory and risks obsolescence — bad for the business.
Answer
Building inventory carries fixed cost forward, flattering profit; it ties up cash and risks obsolescence.
Examiner tip
Marginal costing removes this incentive because fixed overhead is written off regardless of output.

Model Answers — Uses & Limitations of Absorption Costing

High-scoring sample answers for uses & limitations of absorption costing on the Cambridge IGCSE paper, with examiner-style notes mapping each response to the mark scheme and assessment objectives.

Question 1
9706 Paper 4 style3 marks
Q (3 marks). Explain what is meant by absorption costing.
Model answer
Absorption costing charges each unit with its direct costs (materials, labour, expenses) plus a share of production overhead, absorbed using an overhead absorption rate. The result is a full (total) cost per unit.
Why this scores
Marking (point-based, 3). Direct costs (1); plus share of overhead (1); full cost per unit (1).
Question 2
9706 Paper 4 style4 marks
Q (4 marks). State and explain two uses of absorption costing.
Model answer
1. Full-cost pricing — a price set on the full cost ensures all costs (including overheads) are covered in the long run, useful for cost-plus pricing and job quotes. 2. Inventory valuation — IAS 2 requires inventory at full production cost, so absorption costing provides the figure needed for the financial statements.
Why this scores
Marking (point-based, 4). 1 for each use + 1 for each explanation. Accept profitability-by-product / overhead recovery.
Question 3
9706 Paper 4 style4 marks
Q (4 marks). Explain why a manufacturer must use absorption costing, rather than marginal costing, to value the inventory in its published financial statements.
Model answer
IAS 2 requires inventory to be valued at the cost of bringing it to its present condition and location, which includes a share of production overhead. Marginal costing would value inventory at variable cost only, understating it and breaching the standard. Absorption costing provides the full production cost, so it is required for the published accounts.
Why this scores
Marking (point-based, 4). IAS 2 / full production cost (2); marginal understates / breaches standard (2).
Question 4
9706 Paper 4 style4 marks
Q (4 marks). Explain why the use of apportionment is a limitation of absorption costing.
Model answer
Overheads are shared between departments on a chosen basis (e.g. floor area, machinery value). The choice of basis is a judgement — a different basis gives a different department and unit cost — so the full cost is subjective and can be distorted. A distorted full cost can lead to mispricing of products, weakening the usefulness of the figures.
Why this scores
Marking (point-based, 4). Basis is a judgement (1); different basis → different cost (1); subjective/distorted (1); mispricing (1).
Question 5
9706 Paper 4 style5 marks
Q (5 marks). Explain why absorption costing is not suitable for deciding whether to accept a one-off special order.
Model answer
Absorption costing includes a share of fixed overhead in the unit cost. In the short term, fixed costs do not change with the decision — they are incurred whether or not the order is accepted. If the order price is judged against the full cost, it may be rejected even though it exceeds the variable cost and so earns positive contribution. The correct test is whether the price covers the variable cost (marginal costing); provided there is spare capacity, an order earning positive contribution should be accepted because it adds to profit.
Why this scores
Marking (point-based, 5). Full cost includes fixed overhead (1); fixed costs unchanged short-term (1); risk of wrongly rejecting (1); contribution test (1); spare-capacity caveat (1).
Question 6
9706 Paper 4 style5 marks
Q (5 marks). A unit has direct materials $8, direct labour$ 5, variable overhead $2 and absorbs fixed overhead of$ 4. Calculate the marginal cost and the full cost per unit, and state which is used to value inventory in the financial statements and why.
Model answer
Marginal cost = 8 + 5 + 2 = $15. Full cost = 15 + 4 = $19. Inventory is valued at the full cost, $19, because IAS 2 requires inventory at full production cost (including a share of production overhead), not variable cost only.
Why this scores
Marking (point-based, 5). Marginal $15 (1.5); full$ 19 (1.5); inventory at $19 / IAS 2 (2).
Question 7
9706 Paper 4 style6 marks
Q (6 marks). Explain why absorption costing and marginal costing can report different profits for the same period, and state the circumstances in which absorption costing reports the higher profit.
Model answer
Under absorption costing, fixed production overhead is included in the cost of units and therefore carried in inventory; under marginal costing, fixed overhead is a period cost written off in full each period.

When inventory increases during a period, absorption costing carries part of the fixed overhead forward in closing inventory instead of charging it now, so it charges less fixed overhead to the income statement — giving a higher profit than marginal costing.

When inventory falls, the reverse applies and absorption profit is lower. When inventory is unchanged, the two profits are the same.

The difference equals the fixed overhead contained in the change in inventory (fixed OAR × change in units).
Why this scores
Marking (point-based, ~6). Fixed overhead in inventory vs period cost (~2); inventory rises → absorption higher (~2); falls → lower / equal if unchanged + size of difference (~2).
Question 8
9706 Paper 4 style6 marks
Q (6 marks). Discuss whether a business with a wide range of products and high, complex overheads should replace traditional absorption costing with activity-based costing (ABC).
Model answer
For ABC: it shares overhead using cost drivers (set-ups, orders, inspections) — the activities that actually cause cost. With diverse products and complex overheads not driven by volume, this gives more accurate product costs, better pricing and a clearer view of which products are truly profitable. Traditional absorption costing, using a single volume-based rate, may over-cost simple high-volume products and under-cost complex low-volume ones.

Against ABC: it is costly and time-consuming to set up and run — identifying drivers, collecting activity data and maintaining the system — and may not be justified for a small business.

Conclusion: for this business — wide product range, high complex overheads — ABC's greater accuracy is likely to outweigh the extra cost, so a move to ABC is justified; a simpler business should weigh the cost more carefully.
Why this scores
Marking (point-based with judgement, 6). For (cost drivers/accuracy/cross-subsidy) (~3); against (cost/complexity) (~2); supported conclusion fitting the scenario (~1).
Question 9
9706 Paper 4 style6 marks
Q (6 marks). The directors must (a) value closing inventory for the year-end accounts and (b) decide whether to accept a contract priced below full cost but above variable cost, using spare capacity. Advise which costing method to use for each decision, with reasons.
Model answer
(a) Inventory valuation → absorption costing. IAS 2 requires inventory at full production cost, including a share of production overhead, so absorption costing must be used for the published accounts.

(b) The contract → marginal costing. The decision should be based on contribution (price − variable cost), because the fixed overhead is unavoidable and unchanged whether or not the contract is taken. As the price is above variable cost, it earns positive contribution; with spare capacity and no better alternative, accepting the contract increases total profit, even though the price is below full cost.

Conclusion: use absorption costing for the accounts and marginal costing for the short-term contract decision — the right method depends on the purpose.
Why this scores
Marking (point-based, 6). (a) absorption / IAS 2 (~2); (b) contribution / fixed cost unavoidable / spare capacity → accept (~3); conclusion matching method to purpose (~1).
Question 10
9706 Paper 4 style3 marks
Q (3 marks). State three limitations of absorption costing.
Model answer
The apportionment of overhead is arbitrary — the chosen basis is a judgement, so the full cost is subjective.

It uses predetermined rates, causing under- or over-absorption of overhead.

It is not suitable for short-term decisions (special orders, make-or-buy), where contribution should be used.
Why this scores
Marking (point-based, 3). 1 mark each. Accept: more complex than marginal costing; can encourage over-production.

Key Definitions and Keywords — Uses & Limitations of Absorption Costing

Definitions to memorise and the exact keywords mark schemes credit for uses & limitations of absorption costing answers — sharpened from recent examiner reports for the 2026 Cambridge IGCSE sitting.

Absorption costing
Examiner keyword
A costing method that charges each unit with its direct costs plus a share of production overhead — giving a full cost per unit.
Full (total) cost
Examiner keyword
Prime cost + a share of production overhead absorbed into the unit.
Marginal costing
Examiner keyword
A costing method that charges units with variable cost only and treats fixed overhead as a period cost.
Contribution
Examiner keyword
Selling price − variable cost; what each unit contributes towards fixed costs and profit (the basis of short-term decisions).
IAS 2 (inventory valuation)
Examiner keyword
The standard requiring inventory to be valued at the lower of full production cost and net realisable value.
Arbitrary apportionment
Examiner keyword
Sharing overhead on a chosen basis that is a judgement, making the full cost subjective.
Activity-based costing (ABC)
Examiner keyword
Sharing overhead using cost drivers (the activities that cause cost), giving more accurate product costs.
Cost driver
The activity that causes an overhead cost (e.g. number of set-ups, orders, inspections) used to share it in ABC.
Period cost
A cost written off in full in the period (e.g. fixed overhead under marginal costing), not carried in inventory.

Common Mistakes and Misconceptions — Uses & Limitations of Absorption Costing

The traps other students keep falling into on uses & limitations of absorption costing questions — taken from recent Cambridge IGCSE examiner reports and mark schemes — and how to avoid them.

✕Using the full (absorption) cost for a short-term decision
9706 Examiner Reports
Why it happens
Treating fixed overhead as if it changes with the decision.
How to avoid it
For special orders, make-or-buy and drop-a-product, compare on CONTRIBUTION — fixed costs are unchanged.
✕Listing uses/limitations without applying them
9706 Examiner Reports
Why it happens
Memorising bullet points.
How to avoid it
Apply each point to the scenario and, for discuss questions, give a two-sided answer with a supported conclusion.
✕Valuing inventory at marginal cost for the accounts
9706 Examiner Reports
Why it happens
Confusing management and financial accounting.
How to avoid it
IAS 2 requires inventory at FULL production cost (absorption), not variable cost — for the published accounts.
✕Getting the profit difference the wrong way round
9706 Examiner Reports
Why it happens
Forgetting which method carries fixed cost in inventory.
How to avoid it
Inventory RISES → absorption profit HIGHER (fixed cost carried forward); inventory falls → lower.
✕Presenting ABC as costless and always better
9706 Examiner Reports
Why it happens
Focusing only on its accuracy.
How to avoid it
ABC is more accurate where overhead is complex but is more COSTLY and time-consuming — weigh the trade-off.
✕Claiming one method is best for everything
9706 Examiner Reports
Why it happens
Not linking method to purpose.
How to avoid it
Match the method to the decision: absorption for accounts/long-run pricing, marginal for short-term decisions, ABC for accuracy.

Uses & Limitations of Absorption Costing

Detailed Study Notes

At a glance

What you’ll learn

Quick recap

Memorise this

How it’s examined

Take this whole topic with you

1What absorption costing is (3 marks)

2Two uses of absorption costing (4 marks)

3Why inventory must include overhead (4 marks)

4The arbitrary-apportionment limitation (4 marks)

5Why not for short-term decisions (5 marks)

6Full cost vs marginal cost (5 marks)

7Why the two methods give different profit (5 marks)

8Absorption costing vs ABC (5 marks)

9Advise which method to use (6 marks)

10Over-production risk (4 marks)

Absorption costing

Full (total) cost

Marginal costing

Contribution

IAS 2 (inventory valuation)

Arbitrary apportionment

Activity-based costing (ABC)

Cost driver

Period cost

✕Using the full (absorption) cost for a short-term decision

✕Listing uses/limitations without applying them

✕Valuing inventory at marginal cost for the accounts

✕Getting the profit difference the wrong way round

✕Presenting ABC as costless and always better

✕Claiming one method is best for everything