Skip to content

Fundamentals of Financial and Cost Accounting · Classification of Costs (CAS 1)

Classification of Costs by Nature and Element

Updated 10 October 2026 · Fact-checked

Classification of costs by nature groups costs into three elements: material, labour and expenses. Each element is then split into direct (traceable to a cost unit) and indirect (common, needing apportionment). To solve a question, name the element first, then ask whether the cost can be traced to one product or job.

Understand Classification of Costs by Nature and Element

Cost is the amount spent to make a product or give a service. A business spends on thousands of items. To control and price them, we sort them into groups. This sorting is called classification of costs.

The first and most basic sort is by nature or element. There are three elements: material (things consumed, such as cloth in a shirt), labour (human effort, such as a tailor's wages) and expenses (all other costs, such as power, rent and hire of a machine).

The second sort is by traceability. A cost that can be easily and economically traced to one cost unit (one product, job or batch) is a direct cost. A cost that is common to many units and cannot be traced to one is an indirect cost, also called overhead.

Combine the two sorts and you get six boxes: direct material, direct labour, direct expenses, indirect material, indirect labour and indirect expenses. Direct material + direct labour + direct expenses = prime cost. All indirect costs together are overheads.

The same item can be direct in one business and indirect in another. Wood is direct material for a furniture maker, but the nails and glue used in tiny amounts are indirect because tracing them is not worth the effort. Always read what the question says about the product.

Key formulas to remember

Elements of cost
Cost = Material + Labour + Expenses
Every cost falls in one of these three elements.
Direct cost
Direct cost = Direct material + Direct labour + Direct expenses
This total is called prime cost.
Indirect cost
Overheads = Indirect material + Indirect labour + Indirect expenses
Also called overhead. Must be apportioned or absorbed, not traced.
Total cost link
Total cost = Prime cost + Overheads
Overheads here include factory, administration and selling and distribution overheads.

How to solve Classification of Costs by Nature and Element questions

Use this method for any question that asks you to classify a cost or find prime cost and overheads.

  1. 1Read the item and decide its element: is it a material consumed, labour paid, or some other expense?
  2. 2Check the product or job named in the question. Costs are direct or indirect only with respect to a cost unit.
  3. 3Ask: can this cost be traced to one unit easily and economically? If yes, it is direct.
  4. 4If the cost is shared by many units, or tracing it is not worth the effort, mark it indirect.
  5. 5Add all direct items to get prime cost. Add all indirect items to get overheads.
  6. 6Ignore items that are not costs of production, such as interest on loans, income tax, or sale of assets, unless the question asks about them.
  7. 7Match your result with the options and check that only one fits.

Quickest way: Two-question test: element, then traceability

When to use it: Use it for MCQs that ask which item is a direct or indirect cost, or which pair is correctly matched.

  1. Ask 'what is it made of?' to name the element: material, labour or expense.
  2. Ask 'would this cost vanish if I stopped making this one product?' If yes, it is direct.
  3. Typical direct items: raw material, wages of machine operators, royalty on units produced, hire of a machine for one job.
  4. Typical indirect items: factory rent, supervisor salary, lubricants, depreciation of the plant, factory power.
  5. Cross out options that break either test and pick the one left.

Common mistakes in Classification of Costs by Nature and Element

  • Treating all wages as direct labour.

    Students link wages with production in general.

    Fix: Only wages of workers who make the product are direct. Salaries of supervisors, storekeepers and cleaners are indirect labour.

  • Calling every material direct.

    Material sounds like it is always used in the product.

    Fix: Fuel, lubricants, cotton waste and small items like screws are indirect material because they are not traced to a unit.

  • Thinking an item is direct or indirect forever.

    Students memorise lists without the cost unit.

    Fix: Always ask 'direct for which product or job?' A driver's salary is direct for a taxi service but indirect for a factory.

  • Forgetting direct expenses.

    Only material and labour are stressed in class.

    Fix: Remember royalty per unit, hire of special equipment for one job and cost of a special design as direct expenses. They go into prime cost.

  • Including interest, tax or loss on sale of assets in cost.

    These look like expenses.

    Fix: These are financial or appropriation items, not costs of production. Leave them out of prime cost and overheads.

Worked examples

Example 1

A furniture factory in Jaipur makes tables. In a month it spends: wood ₹2,00,000; wages of carpenters making tables ₹80,000; factory supervisor's salary ₹30,000; royalty on a patented design ₹10,000 (paid per table); factory rent ₹40,000; glue and nails ₹5,000. Find the prime cost.

Show the solution
  1. Wood is material traced to tables: direct material ₹2,00,000.
  2. Carpenters' wages are direct labour ₹80,000.
  3. Royalty paid per table is a direct expense ₹10,000.
  4. Supervisor's salary, factory rent and glue and nails are indirect, so they are not in prime cost.
  5. Prime cost = 2,00,000 + 80,000 + 10,000 = ₹2,90,000.

Answer: Prime cost = ₹2,90,000

Example 2

From the same data, find total indirect cost (factory overheads). Options: (a) ₹75,000 (b) ₹85,000 (c) ₹1,15,000 (d) ₹1,25,000

Show the solution
  1. Indirect labour: supervisor's salary ₹30,000.
  2. Indirect expense: factory rent ₹40,000.
  3. Indirect material: glue and nails ₹5,000.
  4. Total = 30,000 + 40,000 + 5,000 = ₹75,000.
  5. Royalty is direct, so it is not added. Option (a) matches.

Answer: (a) ₹75,000

Exam tips

  • Most questions are one-line: 'Which of the following is an indirect cost?' Use the two-question test and finish in under 30 seconds.
  • Watch the product named in the question. The same item can be direct or indirect depending on it.
  • Remember that direct expenses exist. Options that say 'prime cost has only material and labour' are wrong.
  • In sums, first sort items into direct and indirect on rough paper, then add. This avoids missing an item.
  • Skip items such as interest, tax and dividends when summing costs.

Practice questions from Classification of Costs (CAS 1)

Classification of Costs by Nature and Element in other exams

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

Classification of Costs by Nature and Element: frequently asked questions

What is the difference between direct cost and indirect cost?

A direct cost can be traced easily to a single cost unit, like wood in a table. An indirect cost is common to many units, like factory rent, and is shared through apportionment and absorption.

What are the three elements of cost?

The three elements are material, labour and expenses. Each can be direct or indirect, which gives six groups in all.

What is prime cost?

Prime cost is the total of direct material, direct labour and direct expenses. It does not include any overheads.

Is depreciation of a machine a direct or indirect cost?

Usually it is an indirect expense because the machine serves many products. It would be direct only if the machine is used for one job alone and the question treats it so.