Management Accounting · Absorption and marginal costing

Advantages and Limitations of Each Costing Method

Updated 11 October 2026 · Fact-checked

Absorption costing includes fixed production overheads in unit cost, so it suits inventory valuation under IFRS and full cost pricing. Marginal costing charges only variable costs to units and treats fixed costs as a period cost, so it suits short-term decisions and avoids profit shifts caused by inventory changes.

Understand Advantages and Limitations of Each Costing Method

Both methods answer one question: which costs belong in the cost of a unit? They answer it differently, and that difference drives their strengths and weaknesses.

Absorption costing puts all production costs into the unit: direct materials, direct labour, variable production overhead and a share of fixed production overhead. Fixed overhead is carried in closing inventory until the units are sold. Marginal costing puts only variable costs into the unit. All fixed costs are written off in the period they are incurred.

This creates the key link to profit. If production is higher than sales, inventory rises. Absorption costing defers some fixed overhead into closing inventory, so profit is higher than under marginal costing. If sales are higher than production, inventory falls and absorption profit is lower. If production equals sales, profits are the same.

So each method has a natural home. Marginal costing gives you contribution, which is the figure you need for break-even, make-or-buy and special order decisions. Absorption costing gives a full cost per unit, which is needed for external reporting and for cost-plus pricing.

The exam rarely asks you to calculate here. It asks you to pick the correct statement, so learn the points as pairs: a strength of one method is usually the weakness of the other.

Key formulas to remember

Absorption cost per unit: Direct materials + direct labour + variable production overhead + fixed production overhead absorbed; Non-production costs such as selling and administration are not included in inventory value.
Marginal cost per unit: Direct materials + direct labour + variable production overhead (+ variable direct expenses); Variable selling costs are deducted in arriving at contribution but are not part of inventory value.
Contribution: Sales revenue − variable costs; Fixed costs are then deducted as a period cost to give marginal costing profit.
Profit difference: Absorption profit − marginal profit = change in inventory units × fixed overhead absorbed per unit; Inventory increase: absorption profit is higher. Inventory decrease: absorption profit is lower. This assumes the same absorption rate in both periods.

How to solve Advantages and Limitations of Each Costing Method questions

Use this method for any question asking you to evaluate, compare or choose between the two costing methods.

1Identify the purpose in the question: inventory valuation, external reporting, pricing, or a short-term decision.
2Note whether inventory levels are rising, falling or unchanged, as this decides which method shows the higher profit.
3For valuation or reporting, favour absorption costing because IFRS requires inventory to include production overheads.
4For short-term decisions such as special orders, make-or-buy or break-even, favour marginal costing because contribution is the relevant figure.
5Check for a limitation that matches the wording, such as arbitrary overhead apportionment or fixed costs ignored in pricing.
6Eliminate options that swap the two methods or use words like always or never.
7If a number is asked for, calculate unit costs or profit difference carefully and check the sign.

Quickest way: Purpose and inventory test

When to use it: Use this for multiple choice and multiple response questions where time is short.

Ask: is this about the full cost of a unit or about the extra cost of one more unit?
Full cost, valuation, IFRS, cost-plus pricing: choose absorption.
Extra cost, contribution, short-term decision, break-even, no profit distortion from inventory: choose marginal.
Production above sales: absorption profit is higher. Sales above production: marginal profit is higher.
Reject any option claiming marginal costing is allowed for published accounts inventory valuation.

Common mistakes in Advantages and Limitations of Each Costing Method

Saying marginal costing ignores fixed costs completely.
Students hear that fixed costs are not in unit cost and assume they vanish.
Fix: Fixed costs are still deducted in full as a period cost. They are just not in inventory value.
Choosing marginal costing as the method for published accounts.
Marginal costing is simple and popular for decisions, so it feels like the best method overall.
Fix: IFRS requires inventory to include production overheads, so absorption costing is used for external reporting.
Getting the profit difference the wrong way round.
Students memorise the rule without understanding that fixed overhead is carried forward in inventory.
Fix: If inventory rises, some fixed overhead is held back in inventory, so absorption profit is higher.
Listing arbitrary overhead apportionment as a weakness of marginal costing.
Students mix up which method uses overhead absorption rates.
Fix: Only absorption costing needs fixed overhead to be apportioned and absorbed, and that is where the arbitrary element lies.
Saying marginal costing is good for long-term pricing because it shows contribution.
Contribution is useful, so students overextend it.
Fix: In the long run all costs must be covered. Marginal costing can lead to prices that cover only variable costs, so full cost matters for long-term pricing.

Worked examples

Example 1

A company produced 12,000 units and sold 10,000 units in a period. Fixed production overhead absorbed is $5 per unit. Opening inventory was nil. Marginal costing profit was $60,000. What was the absorption costing profit?

Show the solution

Inventory change = 12,000 − 10,000 = 2,000 units increase.
Fixed overhead carried in inventory = 2,000 × $5 = $10,000.
Inventory rose, so absorption profit is higher than marginal profit.
Absorption profit = $60,000 + $10,000 = $70,000.

Answer: $70,000

Example 2

Which ONE of the following is an advantage of marginal costing over absorption costing? A) It values inventory in line with IFRS. B) It avoids arbitrary apportionment of fixed overheads. C) It ensures all production costs are recovered in the selling price. D) It is the required basis for cost-plus pricing.

Show the solution

Option A is an advantage of absorption costing, because IFRS inventory includes production overheads.
Option C is a feature of absorption costing, since fixed production overhead is included in unit cost.
Option D is also associated with full cost pricing, so it favours absorption costing.
Option B is correct: marginal costing treats fixed costs as a period cost, so no apportionment or absorption rate is needed.

Answer: B

Exam tips

Learn the pairs: valuation and full cost pricing favour absorption; decisions and contribution favour marginal.
Read the inventory movement first. It tells you which profit is higher without calculating.
In multiple response questions, select the exact number asked for and check each statement names the correct method.
Watch for traps such as marginal costing being used for IFRS reporting or absorption costing being better for break-even analysis.
If a number entry is required, show the inventory change × fixed cost per unit and check the sign before entering.

Practice questions from Absorption and marginal costing

Advantages and Limitations of Each Costing Method in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Advantages and Limitations of Each Costing Method: frequently asked questions

What are the main advantages of marginal costing?

It is simple, it shows contribution for decisions such as break-even and special orders, and it avoids arbitrary fixed overhead apportionment. Profit also follows sales rather than being distorted by inventory changes.

What are the main disadvantages of marginal costing?

It does not value inventory in line with IFRS, and it can encourage prices that cover only variable costs. It also needs costs to be split into fixed and variable, which is not always clear.

Why is absorption costing used for financial reporting?

IFRS requires inventory to include production overheads, so fixed production overhead must be included in unit cost. Absorption costing does this.

Which method is better for decision making?

Marginal costing is usually better for short-term decisions because contribution shows the extra benefit of an action. For long-term pricing, full cost information from absorption costing matters too.