CAS-4 Certification: A Complete Guide for Captive Consumption & Transfer Pricing

The CAS-4 Certificate — also known as the Cost of Production Certificate for Captive Consumption — is one of the most frequently requested certificates from a Cost Accountant in India. Whether for GST purposes, income tax transfer pricing, or bank submissions, understanding what CAS-4 covers and how the certificate is prepared is essential for CFOs, plant finance managers, and tax professionals.

What is CAS-4?

Cost Accounting Standard 4 was issued by the Institute of Cost Accountants of India (ICMAI) to prescribe the principles for determining the cost of production of goods that are captively consumed — i.e., goods manufactured and used internally within the same company or transferred to a related entity.

The purpose is to establish a standardised, verifiable method for computing the cost of such internal transfers so that regulatory valuations are accurate and defensible.

When is a CAS-4 Certificate Required?

1. GST on Captive Consumption (Schedule I, CGST Act)

Under the CGST Act, goods transferred between distinct persons (different GSTINs of the same company) or between related parties are treated as a supply even when there is no consideration. GST is levied on the transaction value — which, in the absence of an open market price, defaults to the cost of production as determined under CAS-4.

2. Transfer Pricing (Income Tax)

When goods are transferred between two related companies (e.g., parent to subsidiary, or two subsidiaries of the same group), income tax law requires the price to be at arm's length. When the Cost Plus Method is used as the transfer pricing method, the CAS-4 cost of production is the starting point, and the arm's length price = Cost of Production + Appropriate Markup.

3. Anti-Dumping Investigations

The Directorate General of Trade Remedies (DGTR) requires CAS-4-compliant cost of production data from Indian manufacturers who appear as respondents or domestic industry in anti-dumping proceedings.

4. Bank Finance & NCLT Proceedings

Banks financing WIP or stock require independent cost certification. NCLT/IBBI proceedings for insolvency may require certified cost of production for asset valuation.

What Does CAS-4 Include?

The cost of production under CAS-4 includes the following elements:

Who Can Issue a CAS-4 Certificate?

A CAS-4 Certificate can only be issued by a practising Cost Accountant — a Fellow or Associate Member of ICMAI (Institute of Cost Accountants of India) in practice. Chartered Accountants (ICAI members) cannot issue a CAS-4 certificate.

From June 2021, ICMAI has made it mandatory for all certificates to carry a UDIN (Unique Document Identification Number) — a 18-digit unique number generated on ICMAI's UDIN portal at the time of signing. This UDIN can be verified by any third party to confirm the authenticity of the certificate.

How is the CAS-4 Certificate Prepared?

1. Data Collection: Gather product-specific cost data — material consumption, labour, power & fuel, overhead allocation for the specific product.
2. Verification: Cross-check all data against underlying records (purchase ledgers, wage registers, utility bills, depreciation schedules).
3. Cost Sheet Preparation: Prepare a detailed product-wise cost statement following the CAS-4 format.
4. Review for Compliance: Verify that all included elements conform to CAS-4 and that excluded elements (admin overheads, interest) have been properly removed.
5. Certificate Issuance: The CMA signs and stamps the certificate with UDIN from the ICMAI UDIN portal.

Common Mistakes in CAS-4 Certificates

• Including selling overhead: Distribution costs, commissions, and advertising must be excluded.
• Using wrong period data: CAS-4 should reflect actual cost for the period of captive consumption — not standard or budgeted cost.
• Missing UDIN: Certificates without UDIN may not be accepted by GST authorities or courts.
• Not reconciling with audited accounts: Cost data used in CAS-4 must be reconcilable with the company's audited financial statements.