Complete Overview of GST in India: Understanding Types, Rates, and Filing in Practice

Goods and Services Tax fundamentally reshaped India’s indirect tax regime from 01-07-2017. Multiple overlapping levies—VAT, service tax, central excise, entry tax, octroi and others—were replaced by a unified, destination-based tax applicable to almost all supplies of goods and services.

Even today, many businesses know GST as “one nation, one tax” but remain unclear about how different GST components—CGST, SGST, IGST and UTGST—operate in day‑to‑day transactions and how these link to GST return filing. This guide explains the structure, purpose and mechanics of GST in simple language, with a focus on compliance and practical implementation for businesses of all sizes.

1. Meaning of GST and the Value-Added Concept

Goods and Services Tax is a comprehensive indirect tax on the supply of goods and services across India. GST is levied at each stage of the supply chain, but only on the incremental value added at that stage. This is why it is described as a value-added tax system.

How Value Addition and ITC Work

Consider a straightforward supply chain:

  1. A cotton grower sells raw cotton to a spinning unit for Rs. 1,250.
  2. The spinning unit converts it into yarn and sells to a fabric manufacturer for Rs. 2,400.
  3. The fabric manufacturer sells finished fabric to a garment producer for Rs. 3,750.
  4. The garment producer sells shirts to a retailer for Rs. 5,250.
  5. The retailer sells to the final consumer for Rs. 7,000.

At each stage, GST is charged on the transaction value, but every registered assessee is entitled to Input Tax Credit (ITC) on the GST paid on purchases, subject to law. This ensures:

  • Tax is effectively borne only on the value added at each stage.
  • Cascading (tax on tax) is eliminated.
  • Final consumer bears the ultimate tax burden.

Note: GST is destination-based, meaning revenue accrues to the state where the goods or services are finally consumed, not where they originate. This is a critical departure from the earlier origin-based system.

2. Evolution and Objectives of GST in India

The idea of a national GST was first floated in 2000. After years of consultation between the Centre and states, the 101st Constitutional Amendment paved the way for GST, which was implemented from 01-07-2017.

The GST Council, consisting of the Union Finance Minister and Finance Ministers of states and certain Union Territories, recommends tax rates, exemptions and compliance frameworks.

Key Objectives Behind Introducing GST

  • Remove cascading effect of multiple indirect taxes.
  • Create a unified national market by harmonising tax structure across states and Union Territories.
  • Improve transparency and curb evasion through invoice-level reporting and a digital compliance platform.
  • Simplify compliance via standardised returns and a single GSTIN per state of registration.
  • Lower hidden costs in supply chains, thereby aiding competitiveness and growth.

Before GST, moving goods from one state to another involved multiple state border levies and checks, significantly increasing transaction time and cost. GST has largely rationalised this process.

3. Types of GST in India: The Dual Structure

India follows a dual GST model where both the Central Government and state governments (or certain Union Territories) levy tax concurrently on the same transaction, depending on its nature.

There are four distinct GST components:

  • CGST – Central Goods and Services Tax
  • SGST – State Goods and Services Tax
  • IGST – Integrated Goods and Services Tax
  • UTGST – Union Territory Goods and Services Tax

The applicable component depends primarily on whether the supply is:

  • Within the same state/Union Territory (intra-state/intra-UT), or
  • Between two different states/Union Territories (inter-state), or
  • An import/export transaction.

Understanding this classification is essential for correct invoicing, ITC utilisation and GST return filing.

4. CGST – Central Goods and Services Tax

CGST is the central portion of GST charged on intra-state supplies of goods or services.

Core Features of CGST

  • Governing law: Central Goods and Services Tax Act, 2017.
  • Levy: Charged on supplies where location of supplier and place of supply are in the same state/UT.
  • Authority collecting tax: Central Government.
  • Always accompanied by: SGST or UTGST on intra-state/intra-UT transactions.
  • ITC utilisation: CGST ITC can be used to pay:
    • First: CGST liability
    • Then: IGST liability

Illustration of CGST

A distributor in Jaipur sells machinery worth Rs. 1,20,000 to a dealer also located in Jaipur. GST rate applicable: 18%.

  • CGST @ 9% = Rs. 10,800 (credited to Centre)
  • SGST @ 9% = Rs. 10,800 (credited to Rajasthan)
  • Total invoice value = Rs. 1,41,600

The purchasing dealer can claim ITC of Rs. 10,800 (CGST) and Rs. 10,800 (SGST) subject to eligibility. Both components must be reported distinctly in returns.

Important: For any intra-state supply, total GST rate is split equally between CGST and SGST/UTGST.

5. SGST – State Goods and Services Tax

SGST represents the state share of GST on intra-state supplies.

Key Aspects of SGST

  • Governing law: Respective State SGST Acts (e.g., Maharashtra Goods and Services Tax Act, Karnataka Goods and Services Tax Act).
  • Authority collecting tax: Concerned State Government.
  • Applicable on: Intra-state supply of goods and/or services.
  • ITC utilisation: SGST ITC can be used to discharge:
    • First: SGST liability
    • Then: IGST liability
    • Cannot be used for CGST liability.
  • Revenue destination: State where place of supply lies.

Role of SGST in GST Returns

While filing GSTR‑1 and GSTR‑3B, values of CGST and SGST are shown separately. Accurate classification is vital because cross-utilisation between CGST and SGST is restricted by law.