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CA Intermediate · Cost and Management Accounting

Overheads - Absorption Costing Method: CA Intermediate Cost and Management Accounting

Overheads are indirect costs that cannot be traced to one cost unit. In absorption costing you collect them, allocate or apportion them to departments, reapportion service costs, then absorb them into products using a rate. Finally you compare absorbed with actual overhead to find under- or over-absorption.

What this chapter covers

This chapter shows how a business turns indirect costs, such as factory rent, supervision, power and depreciation, into a cost per unit. Direct material, labour and expenses can be traced to a product. Overheads cannot. So you follow a fixed chain: classify, collect, allocate, apportion, reapportion, absorb, and then adjust for any difference.

Most questions are numerical and follow that chain in order. A typical problem gives a list of expenses with bases, asks for a primary distribution, then a secondary distribution among service departments, then an absorption rate for each production department. Some questions stop at one step. Others cover the whole chain and end with under- or over-absorption or a note on idle capacity.

The chapter connects to the rest of the paper. The overhead rate feeds directly into the cost sheet, job costing, batch costing, process costing and service costing. It also sets up marginal costing, where fixed overheads are treated differently. If you are weak here, errors will carry into those chapters.

This chapter gives you steady marks because the method is mechanical and the steps are fixed. A full distribution question can be solved correctly by anyone who follows the sequence, and each step carries marks even if a later step goes wrong. It also supports MCQs on classification, bases of apportionment, rate formulas and under-absorption treatment, which need no long working. Time spent here also pays back in job, batch, process and service costing, where you must compute and use an overhead rate. Careful presentation with a clear working table earns step marks in the 70-mark written part.

Overheads - Absorption Costing Method: topics in the order to study them

  1. 1Meaning and Classification of OverheadsYou need the vocabulary first: factory, administration, selling, distribution, fixed, variable and semi-variable overheads.
  2. 2Collection, Codification and Allocation of OverheadsAllocation is the simplest step, where a cost belongs wholly to one department, and it sets up the idea of apportionment.
  3. 3Apportionment and Primary Distribution of OverheadsOnce allocation is clear, you learn to share common costs using suitable bases such as floor area, number of workers or value of assets.
  4. 4Secondary Distribution: Reapportionment of Service CostsThis builds on primary distribution and covers direct, step-ladder and reciprocal methods, the hardest part of the chapter.
  5. 5Overhead Absorption Methods and RatesAfter all costs sit in production departments, you convert them into rates per unit, per labour hour or per machine hour.
  6. 6Under-Absorption and Over-Absorption of OverheadsYou can only compare absorbed and actual overheads once you can compute a predetermined rate.
  7. 7Capacity Levels, Idle Capacity and Special Overhead TreatmentsStudy this last, as it refines the rate and treatment of abnormal items once the core method is secure.

How to prepare Overheads - Absorption Costing Method

Treat this chapter as a process you can rehearse. Learn the sequence, practise the calculations, then work on speed and presentation.

  1. Write the chain on one page: classify, collect, allocate, apportion, reapportion, absorb, adjust. Check every question against it.
  2. Learn the common bases of apportionment and which expense uses which basis, for example rent by floor area and canteen cost by number of workers.
  3. Practise primary distribution tables until you can lay out columns for departments and rows for expenses without hesitation.
  4. Solve secondary distribution with the direct, step-ladder and reciprocal methods. For reciprocal, practise forming simultaneous equations and solving them accurately.
  5. Compute absorption rates using different bases, then decide which base suits a department, such as machine hours for a machine-intensive one.
  6. Solve under- and over-absorption questions and practise the disposal treatment, then attempt capacity and idle time problems.
  7. Finish with full-length questions under time and a set of MCQs. Check that totals before and after distribution match.

Common mistakes in Overheads - Absorption Costing Method

  • Mixing up allocation and apportionment

    Fix: Ask one question: does the cost belong wholly to one department? If yes, allocate. If it is shared, apportion on a logical basis.

  • Using the wrong basis of apportionment

    Fix: Match the cost to its driver, such as area for rent, kilowatt hours for power and number of employees for welfare costs. Use the basis given in the question.

  • Errors in reciprocal service department equations

    Fix: Write each equation fully, solve carefully, then verify that the distributed totals add back to the original service cost.

  • Using actual figures for the absorption rate

    Fix: Use budgeted overhead and budgeted base for the predetermined rate, then multiply by the actual base to get absorbed overhead.

  • Reversing under- and over-absorption

    Fix: Compare absorbed with actual. Absorbed less than actual means under-absorbed. Absorbed more than actual means over-absorbed.

  • Poor layout in long distribution questions

    Fix: Use a clear table with expenses in rows and departments in columns. Show totals and bases, and tick back to the question.

Last-day revision: Overheads - Absorption Costing Method

  • Overheads are indirect costs, split into factory, administration, selling and distribution.
  • Allocation assigns a whole cost item to one cost centre. Apportionment shares it across several.
  • Primary distribution spreads all overheads over production and service departments.
  • Secondary distribution moves service department costs to production departments.
  • Direct method ignores service-to-service transfers. Step-ladder allows one-way transfers. Reciprocal allows two-way transfers.
  • Reciprocal method: set up equations such as S1 = own cost + share of S2, and solve them together.
  • Absorption rate = Budgeted overhead ÷ Budgeted base (units, labour hours or machine hours).
  • Under-absorption = Actual overhead − Absorbed overhead, when actual is higher.
  • Over-absorption = Absorbed overhead − Actual overhead, when absorbed is higher.
  • Idle capacity cost is usually treated as abnormal and not loaded to product cost.
  • Check that total overhead after secondary distribution equals total before it.

Overheads - Absorption Costing Method practice questions

Overheads - Absorption 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.

Overheads - Absorption Costing Method: frequently asked questions

Is the overheads chapter mostly numerical?

Yes, most of it is. Expect distribution tables, absorption rates and under- or over-absorption calculations. Some MCQs and short theory parts test classification, bases and treatment of idle capacity.

Which secondary distribution method is hardest?

The reciprocal method is usually the hardest because it needs simultaneous equations. Practise setting them up and solving them until it feels routine.

How do I choose between machine hour and labour hour rates?

Use the base that best reflects how the department incurs overhead. A machine-intensive department suits a machine hour rate. A labour-intensive one suits a labour hour rate. If the question gives a base, use it.

Does this chapter help with other chapters in the paper?

Yes. The overhead rate is used in the cost sheet, job, batch, process and service costing. It also helps when you study marginal costing and treatment of fixed overheads.