Composite Supply vs Mixed Supply Under GST: A Practical, Example-Driven Guide

Understanding how a bundled transaction is classified under GST is crucial for determining the correct tax rate and avoiding disputes. In many day‑to‑day business situations, two or more goods or services are supplied together under a single invoice. Depending on their nature, such supplies may be treated either as a Composite Supply or a Mixed Supply under the CGST Act, 2017.

This classification directly affects:

  • The applicable GST rate
  • Valuation and invoicing
  • Exposure to interest, penalties, and future litigation

The core legal framework is contained in:

  • Section 2(30) – Definition of Composite Supply
  • Section 2(74) – Definition of Mixed Supply
  • Section 8 – Tax liability on Composite and Mixed Supplies
  • Section 2(90) – Definition of Principal Supply

This guide explains these concepts in simple language with practical illustrations, while retaining the statutory language and section references.

Definition of Composite Supply – Section 2(30)

Section 2(30) of the CGST Act describes a Composite Supply as a supply comprising two or more taxable supplies of goods or services, or both, which:

  • Are naturally bundled, and
  • Are supplied together in the ordinary course of business, and
  • Have one principal supply among them.

In essence, if a customer usually receives those items together as part of a single transaction and one of them is clearly the main element, it will generally be a Composite Supply.

Tax consequence: In a Composite Supply, the entire transaction is taxed at the GST rate applicable to the Principal Supply.

Definition of Principal Supply – Section 2(90)

Under Section 2(90), Principal Supply means the predominant element of a Composite Supply, to which the other supplies are ancillary.

Put simply, it is the main objective of the customer’s purchase; the other elements are only supportive or incidental.

Illustration of Principal Supply
An assessee buys a refrigerator along with on-site installation and demonstration:

  • Refrigerator – main product
  • Installation and demonstration – supporting services

The assessee’s primary purpose is to obtain the refrigerator. Hence, the refrigerator is the Principal Supply, and installation/demonstration are ancillary.

Composite Supply – Concept, Indicators & Detailed Examples

Essential Characteristics of Composite Supply

A transaction will generally qualify as a Composite Supply when:

  • Two or more taxable supplies are involved
  • These supplies are normally provided together in that line of business
  • They are naturally bundled, not artificially combined to gain a tax advantage
  • There is a Principal Supply that dominates the arrangement
  • The assessee’s intention is to receive the main supply; other elements are incidental

Note: The perception and expectations of a typical customer in that trade become critical in deciding whether supplies are “naturally bundled.”

Practical Example 1 – Air Conditioner with Installation

Scenario
An assessee purchases:

  • Split AC – ₹62,500
  • Installation service – ₹2,500
  • Total invoice value – ₹65,000

The installation service is inherently connected with the sale of the AC.