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Cost Accounting · Cost Accounting Standards (CAS 1 to CAS 24)

Introduction to Cost Accounting Standards and CASB

Updated 10 October 2026 · Fact-checked

Cost Accounting Standards (CAS) are written rules issued by the Cost Accounting Standards Board of ICMAI that fix how costs are classified, measured, assigned and disclosed. They make cost data uniform and comparable, and cost records and cost audit follow them. To answer questions, state the purpose, link the standard to its subject, and name the benefit.

Understand Introduction to Cost Accounting Standards and CASB

Imagine two factories making the same product. One treats factory rent as a direct cost. The other treats it as an overhead. Their product costs will differ even if their operations are identical. You cannot compare them, and a regulator cannot rely on either figure. Cost Accounting Standards exist to remove this problem.

A Cost Accounting Standard (CAS) is a written statement issued by ICMAI that sets out the principles and methods for classifying, measuring, assigning and presenting one area of cost. Each standard covers one subject, such as material cost, employee cost or overheads. Following the same rules brings uniformity and consistency across firms and across years.

The Cost Accounting Standards Board (CASB) is the body set up by ICMAI to frame these standards. Its role is to study the cost accounting practices in use, identify areas where practices differ, draft standards, take views from industry, government and professionals, and issue the final standard. It also keeps standards under review as business practices change.

The standards matter in law because of the Companies Act, 2013. Section 148 deals with cost records and cost audit. The rules made under it expect cost records to be kept in line with generally accepted cost accounting principles and the standards issued by ICMAI. The cost auditor then reports on the records, including whether the standards have been followed. So the chain is: CASB frames the standard, the company applies it in its cost records, and the cost auditor checks it.

The set CAS 1 to CAS 24 covers subjects such as cost classification, capacity, overheads, captive consumption, transportation, material, employee cost, utilities, packing material, direct expenses, administrative overheads, repairs and maintenance, service cost centres, pollution control, selling and distribution, depreciation, interest, research and development, joint costs, royalty, quality control, manufacturing cost, overburden removal, and grants and subsidies. A standard typically has a similar layout: introduction, objective, scope, definitions, measurement, assignment of costs, presentation, disclosure and effective date. Knowing this layout helps you answer any question about what a standard contains.

Key rules to remember

Purpose in one line
CAS = uniform principles for classification + measurement + assignment + presentation + disclosure of cost
Use this as the opening line of any definition answer.
Chain of authority
ICMAI → CASB → CAS → company cost records → cost audit report
Shows how standards flow into cost records and audit under Section 148 of the Companies Act, 2013.
Typical layout of a CAS
Introduction → Objective → Scope → Definitions → Measurement → Assignment → Presentation → Disclosure → Effective date
Use it to describe the structure of a standard. Exact headings can vary slightly from one standard to another.
CAS 1 to CAS 6
1 Classification of Cost; 2 Capacity Determination; 3 Overheads; 4 Cost of Production for Captive Consumption; 5 Average (Equalized) Cost of Transportation; 6 Material Cost
Learn in numbered order.
CAS 7 to CAS 12
7 Employee Cost; 8 Cost of Utilities; 9 Packing Material Cost; 10 Direct Expenses; 11 Administrative Overheads; 12 Repairs and Maintenance Cost
Mnemonic idea: people, power, packing, direct expenses, admin, repairs.
CAS 13 to CAS 18
13 Cost of Service Cost Centre; 14 Pollution Control Cost; 15 Selling and Distribution Overheads; 16 Depreciation and Amortisation; 17 Interest and Financing Charges; 18 Research and Development Costs
Mostly support and finance-related costs.
CAS 19 to CAS 24
19 Joint Costs; 20 Royalty and Technical Know-how Fee; 21 Quality Control; 22 Manufacturing Cost; 23 Overburden Removal Cost; 24 Treatment of Revenue Grants and Subsidies
Specialised costs. Check the numbering against your ICMAI study material before the exam.

How to solve Introduction to Cost Accounting Standards and CASB questions

Most questions on this topic ask you to define, explain, list or justify. Use one fixed method so you never miss a scoring point.

  1. 1Read the verb. 'Define' needs a one-line meaning. 'Explain' needs reasons. 'List' needs names and numbers. 'Discuss' needs both sides or both benefits and limits.
  2. 2Open with the meaning of a Cost Accounting Standard in one sentence: written principles issued by ICMAI through the CASB for a specific area of cost.
  3. 3Add the role of the CASB in two or three points: studies practices, drafts standards, takes comments, issues and reviews them.
  4. 4Give the need or benefits as separate bullets: uniformity, comparability, reliability of cost data, support for cost audit and regulation, better cost control and pricing decisions.
  5. 5Link to cost records and cost audit: the Companies Act, 2013 (Section 148) and its rules expect records to follow standards, and the cost auditor reports on this.
  6. 6If the question names a cost item, match it to its standard by number and title.
  7. 7Close with one line on the practical result, such as comparable and dependable cost data for management and regulators.

Quickest way: Four-point recall: What, Who, Why, Where

When to use it: Use this for short notes, 4 to 6 mark parts, and when you have little time left.

  1. What: CAS are written principles for classifying, measuring, assigning and disclosing cost.
  2. Who: issued by the CASB, which is set up by ICMAI.
  3. Why: uniformity, comparability, reliability and a base for cost audit.
  4. Where: applied in cost records, cost statements and cost audit reports, with CAS 1 to CAS 24 covering the main cost areas.
  5. For MCQs, match the cost item to the standard title first and ignore the distractor options that describe a different cost.

Common mistakes in Introduction to Cost Accounting Standards and CASB

  • Saying that CASB is a government body or that it is the same as the Accounting Standards Board.

    Both boards issue standards, so students merge them.

    Fix: Remember: the CASB is formed by ICMAI and issues cost accounting standards. Financial accounting standards come from ICAI. Keep the two names apart.

  • Mixing up standard numbers, for example giving CAS 6 for employee cost or CAS 7 for material cost.

    Students try to learn the whole list by rote with no pattern.

    Fix: Learn in blocks of six. CAS 6 is Material Cost and CAS 7 is Employee Cost. Revise the block lists daily for a week.

  • Writing that standards are only for cost auditors.

    The topic is often introduced together with cost audit.

    Fix: Say that standards guide everyone who prepares cost information, including management. The cost auditor then checks compliance.

  • Listing benefits as one vague line like 'it improves costing'.

    Students know the idea but do not break it into points.

    Fix: Write four or five separate points: uniformity, comparability, reliability, support for audit and regulation, better decisions.

  • Treating a standard as a law passed by Parliament.

    The word 'standard' sounds like a statutory rule.

    Fix: The standard is issued by ICMAI. Its force in a company's cost records comes from the Companies Act, 2013 and the rules made under it, which expect compliance.

  • Skipping the structure of a standard in an 'explain the contents' question.

    Students focus only on the purpose.

    Fix: Add the layout: objective, scope, definitions, measurement, assignment, presentation, disclosure and effective date.

Worked examples

Example 1

Explain the need and benefits of Cost Accounting Standards. (Model answer for a written question.)

Show the solution
  1. Start with meaning: Cost Accounting Standards are written principles issued by ICMAI through the CASB to guide how costs are classified, measured, assigned and disclosed.
  2. Need: without standards, firms follow different practices for the same cost, for example different ways of absorbing overheads or valuing material. Cost figures then cannot be compared or trusted.
  3. Benefit 1, uniformity: the same item is treated the same way in every firm.
  4. Benefit 2, comparability: cost data can be compared between firms and across years.
  5. Benefit 3, reliability: clear rules reduce arbitrary judgement and manipulation.
  6. Benefit 4, support for regulation and audit: cost records kept under the standards give the cost auditor a clear base to check.
  7. Benefit 5, better decisions: dependable costs help with pricing, cost control and profitability analysis.

Answer: Cost Accounting Standards give uniform, comparable and reliable cost information. They guide cost records, support cost audit and help management and regulators make better decisions.

Example 2

Match each cost item to the correct standard: (a) Employee cost, (b) Joint costs, (c) Depreciation and amortisation, (d) Overheads. Then state in two lines how the standards relate to cost audit.

Show the solution
  1. Employee cost is CAS 7.
  2. Joint costs is CAS 19.
  3. Depreciation and amortisation is CAS 16.
  4. Overheads is CAS 3.
  5. Relation to cost audit: under Section 148 of the Companies Act, 2013 and its rules, cost records are to follow the cost accounting standards issued by ICMAI.
  6. The cost auditor checks the records and reports on compliance, so the standards act as the yardstick for the audit.

Answer: (a) CAS 7, (b) CAS 19, (c) CAS 16, (d) CAS 3. Standards are the yardstick: the company applies them in cost records and the cost auditor reports on compliance.

Exam tips

  • Learn the CAS 1 to CAS 24 list in four blocks of six. MCQs often ask for the number or title of one standard.
  • For short notes, write the CASB role in three bullets and the benefits in four or five bullets. Separate bullets earn separate marks.
  • Always mention the link with cost records and cost audit under the Companies Act, 2013. It lifts a plain theory answer.
  • In MCQs on a cost item, first identify the item and match it to its standard. Four-option questions usually have one option that sounds right but names a different standard.
  • Do not guess dates or amounts of the board's history. Stick to roles, purposes and the standards list.

Practice questions from Cost Accounting Standards (CAS 1 to CAS 24)

Introduction to Cost Accounting Standards and CASB in other exams

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

Introduction to Cost Accounting Standards and CASB: frequently asked questions

What is CASB and what does it do?

The Cost Accounting Standards Board is the body set up by ICMAI to frame cost accounting standards. It studies existing practices, drafts standards, invites views from stakeholders and issues the final standards. It also reviews them when needed.

How many Cost Accounting Standards are there in CAS 1 to CAS 24?

The range CAS 1 to CAS 24 has twenty-four standards, each on a separate cost area. Examples are CAS 1 Classification of Cost, CAS 6 Material Cost, CAS 7 Employee Cost and CAS 19 Joint Costs. Learn them in blocks of six.

Why are Cost Accounting Standards needed?

They bring uniformity so that the same cost item is treated in the same way everywhere. This makes cost data comparable and reliable. It also gives cost records and cost audit a clear base.

How are cost accounting standards linked to cost audit?

The Companies Act, 2013 (Section 148) and its rules deal with cost records and cost audit, and expect records to follow the standards issued by ICMAI. The cost auditor examines the records and reports on compliance.