Goods and Services Tax (GST) is India’s unified indirect tax system that replaced multiple central and state taxes, including excise duty, VAT, service tax, and entry tax. Implemented on July 1, 2017, through the 101st Constitutional Amendment, GST is a comprehensive, multi-stage, destination-based tax levied on every instance of value addition in the supply chain. The system operates through four components: CGST (Central GST), SGST (State GST), IGST (Integrated GST), and UTGST (Union Territory GST).
What Is GST?
GST is an indirect tax levied on the supply of goods and services at each stage of the value chain, from raw material procurement through manufacturing to the final sale to the consumer. The end consumer bears the tax, while businesses at each stage act as collection agents, remitting the tax to the Government after claiming credit for GST paid on their inputs.
The GST framework is governed by the Central Goods and Services Tax Act, 2017 (CGST Act), the respective State Goods and Services Tax Acts (SGST Acts), the Integrated Goods and Services Tax Act, 2017 (IGST Act), and the Union Territory Goods and Services Tax Act, 2017 (UTGST Act).
Key Features of GST
GST is a multi-stage tax, meaning it is collected at each point of sale in the supply chain. It is a destination-based tax, meaning the tax revenue goes to the state where goods or services are consumed, not to the state where they are produced. It eliminates the cascading effect of taxes through the Input Tax Credit mechanism, where tax paid on inputs is offset against tax collected on outputs. It is a comprehensive tax that subsumes central taxes (excise duty, service tax, CVD, SAD, CST) and state taxes (VAT, entry tax, purchase tax, luxury tax, entertainment tax, octroi).
GST Components and Applicability
| Component | Full Form | Applied On | Revenue Goes To |
| CGST | Central Goods and Services Tax | Intra-state supplies | Central Government |
| SGST | State Goods and Services Tax | Intra-state supplies | State Government |
| IGST | Integrated Goods and Services Tax | Inter-state supplies and imports | Central Government (shared with states) |
| UTGST | Union Territory Goods and Services Tax | Supplies within Union Territories without a legislature | Union Territory administration |
| Compensation Cess | GST Compensation Cess | Luxury and demerit goods (pan masala, tobacco, aerated drinks, motor vehicles) | Central Government (for compensating states) |
For intra-state transactions (within the same state), both CGST and SGST are charged at equal rates that together equal the applicable GST rate. For example, a supply attracting 18% GST within Maharashtra will be charged as 9% CGST + 9% SGST. For inter-state transactions (between two states), only IGST is charged at the full rate.
GST Rate Structure
| Rate Slab | Examples of Goods | Examples of Services |
| 0% (Exempt) | Fresh fruits, vegetables, milk, cereals, and educational books | Healthcare, education, public transport |
| 5% | Packaged food items, economy air travel, and transport of goods | Small restaurant services (without ITC), rail travel |
| 12% | Processed food, business class air travel, and clothing above Rs. 1,000 | Construction of affordable housing, work contracts |
| 18% | Industrial machinery, capital goods, electronics, hair oil | IT services, financial services, telecom, restaurant services (with ITC) |
| 28% | Motor vehicles, luxury items, aerated beverages, and tobacco | Five-star hotel accommodation (room tariff above Rs. 7,500) |
| 28% + Cess | Luxury cars, pan masala, cigarettes | Not applicable to services |
The GST Council, comprising the Union Finance Minister and all state finance ministers, is the decision-making body that determines and revises GST rates. Council meetings are held periodically to address rate rationalisation, exemptions, and procedural changes.
GST Registration
GST registration is mandatory for businesses exceeding the prescribed turnover thresholds and for certain categories of businesses regardless of turnover.
| Category | Registration Threshold | Special Notes |
| Goods suppliers (general states) | Rs. 40 lakh aggregate turnover | Reduced to Rs. 20 lakh for special category states |
| Service providers | Rs. 20 lakh aggregate turnover | Rs. 10 lakh for special category states |
| E-commerce operators | Mandatory regardless of turnover | Must register in every state of operation |
| Casual taxable persons | Mandatory regardless of turnover | Temporary registration for the period of business |
| Non-resident taxable persons | Mandatory regardless of turnover | Must register at least 5 days before commencing business |
| Persons making interstate supplies | Mandatory regardless of turnover | Exception for specific handicraft and service suppliers |
| Input Service Distributors | Mandatory regardless of turnover | Separate ISD registration required |
Registration is obtained online through the GST portal at http://www.gst.gov.in. The process typically takes 3 to 7 working days after the application is submitted, along with the required documents, including PAN, Aadhaar, proof of business address, bank account details, and authorised signatory details.
Input Tax Credit Mechanism
The ITC mechanism is the backbone of GST, eliminating the cascading effect of taxes. Businesses claim credit for GST paid on their inputs (purchases) and offset it against the GST collected on their outputs (sales). Only the net difference is paid to the Government.
For ITC to be claimed, the buyer must hold a valid GST registration, possess a valid tax invoice from the supplier, have received the goods or services, the supplier must have filed their GSTR-1 and the credit must reflect in the buyer’s GSTR-2B, the buyer must file GSTR-3B within the prescribed deadline, and payment to the supplier must be made within 180 days.
Certain categories of goods and services are blocked from ITC under Section 17(5) of the CGST Act, including motor vehicles (with exceptions), food and beverages, club memberships, health insurance (unless mandatory), and construction of immovable property.
E-Invoicing and E-Way Bills
E-Invoicing. Electronic invoicing is mandatory for businesses with an aggregate turnover exceeding Rs. 5 crore. Each B2B invoice must be registered on the Invoice Registration Portal (IRP), which assigns a unique Invoice Reference Number (IRN). E-invoice data auto-populates into GSTR-1 and the e-way bill system.
E-Way Bills. An electronic waybill is required for transporting goods valued at more than Rs. 50,000. The bill is generated on the e-way bill portal and is valid for the distance travelled (1 day per 200 km). It must be carried during transit and produced for inspection if requested by tax officers.
GST Returns and Compliance Calendar
| Return | Who Files | Frequency | Due Date |
| GSTR-1 | All regular taxpayers | Monthly/Quarterly | 11th (monthly) or 13th (quarterly) of the following month |
| GSTR-3B | All regular taxpayers | Monthly/Quarterly | 20th (monthly) or 22nd/24th (quarterly) of the following month |
| GSTR-4 | Composition scheme taxpayers | Annual | Apr 30 of the following financial year |
| GSTR-9 | All regular taxpayers | Annual | Dec 31 of the following financial year |
| GSTR-5 | Non-resident taxpayers | Monthly | 13th of the following month |
| GSTR-6 | Input Service Distributors | Monthly | 13th of the following month |
| GSTR-8 | E-commerce operators | Monthly | 10th of the following month |
Key Terms
• GST Council: The constitutional body comprising the Union Finance Minister and state finance ministers that decides GST rates, rules, and procedures for the entire country
• Place of Supply: The location determining whether a transaction is intra-state (CGST + SGST) or inter-state (IGST), governed by specific rules in the IGST Act
• Composition Scheme: A simplified GST compliance option for small businesses with turnover up to Rs. 1.5 crore, allowing them to pay GST at a fixed percentage of turnover
• Reverse Charge Mechanism (RCM): A provision where the liability to pay GST shifts from the supplier to the recipient of goods or services in specified cases
• Electronic Credit Ledger: The online account on the GST portal where ITC is maintained and can be utilised against output tax liability
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| Disclaimer: This article is for informational purposes only and does not constitute legal or tax advice. Consult a qualified tax professional for advice specific to your situation. |
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Frequently Asked Questions
Q1: What taxes did GST replace in India?
GST replaced 17 central and state taxes, including Central Excise Duty, Service Tax, VAT, CST, Entry Tax, Purchase Tax, Luxury Tax, Entertainment Tax, Octroi, and various surcharges and cesses levied by central and state governments.
Q2: What are the GST rate slabs in India?
GST has five rate slabs: 0% (exempt), 5%, 12%, 18%, and 28%. Luxury and demerit goods, such as tobacco, aerated beverages, and luxury cars, attract an additional compensation cess over the 28% base rate.
Q3: When is GST registration mandatory?
Registration is mandatory when aggregate turnover exceeds Rs. 40 lakh for goods suppliers (Rs. 20 lakh in special category states) or Rs. 20 lakh for service providers (Rs. 10 lakh in special category states). E-commerce operators and interstate suppliers must register regardless of turnover.
Q4: What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) are levied together on intra-state transactions, with the revenue shared between the central and state governments. IGST (Integrated GST) is charged on inter-state transactions and imports, collected by the centre and settled with the destination state.
Q5: Can all businesses claim Input Tax Credit under GST?
No. Only GST-registered businesses can claim ITC, and only on eligible purchases used for business purposes. Composition scheme taxpayers cannot claim ITC. Certain categories under Section 17(5) are blocked from ITC regardless of registration status.
