What is GST? A Complete Guide for Indian Businesses in 2026
Table of Contents
In my 15+ years as a GST Practitioner in Karol Bagh, New Delhi, I have helped over 1,500 businesses understand and comply with GST. This guide draws from real experiences with traders in Chandni Chowk, manufacturers in Okhla, and freelancers across Delhi.
What is GST?
Goods and Services Tax (GST) is India's comprehensive indirect tax, launched on 1 July 2017, replacing a complex web of central and state taxes including VAT, service tax, central excise, and octroi. It is a destination-based, multi-stage tax levied on every value addition.
GST is governed by the GST Council (chaired by the Union Finance Minister) and administered jointly by the Central and State Governments. As of 2026, India's GST system has matured significantly with over ₹1.94 lakh crore in monthly collections, making it one of the world's largest tax reforms.
Key Insight: Before GST, a product could be taxed 5+ times across the supply chain. Under GST, there is a single, seamless credit chain that eliminates the cascading effect of taxes.
Types of GST in India
| Type | Full Form | Levied By | When Applicable |
|---|---|---|---|
| CGST | Central GST | Central Government | Intra-state supply |
| SGST | State GST | State Government | Intra-state supply |
| IGST | Integrated GST | Central Government | Inter-state supply & imports |
| UTGST | Union Territory GST | Union Territory | Intra-UT supply |
Example: If a dealer in Delhi sells goods worth ₹10,000 to a buyer in Delhi at 18% GST:
- CGST @ 9% = ₹900
- SGST @ 9% = ₹900
- Total GST = ₹1,800
If the same sale is to a buyer in Mumbai:
- IGST @ 18% = ₹1,800
GST Registration Thresholds
| Category | Threshold (Annual Turnover) |
|---|---|
| Normal category states (goods) | ₹40 lakh |
| Special category states (goods) | ₹20 lakh |
| Service providers | ₹20 lakh (₹10 lakh for special states) |
| E-commerce operators | No threshold — must register |
| Inter-state suppliers | ₹20 lakh |
| Input Service Distributors | Mandatory regardless of turnover |
How GST Works — The Credit Chain
The beauty of GST lies in the Input Tax Credit (ITC) mechanism. Every person in the supply chain can claim credit for the GST paid on their purchases:
- Manufacturer buys raw materials for ₹100 + ₹18 GST. Sells finished goods for ₹200 + ₹36 GST. Pays ₹36 - ₹18 = ₹18 net GST.
- Wholesaler buys for ₹200 + ₹36 GST. Sells for ₹300 + ₹54 GST. Pays ₹54 - ₹36 = ₹18 net GST.
- Retailer buys for ₹300 + ₹54 GST. Sells for ₹400 + ₹72 GST. Pays ₹72 - ₹54 = ₹18 net GST.
Total tax collected: ₹72 on a value addition of ₹400 — exactly 18% of the final price, with no cascading.
Benefits of GST
- One Nation, One Tax: Unified tax structure across India
- Elimination of cascading: ITC ensures tax is only on value addition
- Simplified compliance: Single online portal (gst.gov.in) for everything
- Lower overall tax burden: Most goods are cheaper than pre-GST
- Boost to GDP: Estimated 1-2% GDP increase due to unified market
- Logistics efficiency: No border check-posts, faster movement of goods
Basic GST Compliance Requirements
- GST Registration: Within 30 days of crossing threshold
- GSTR-1: Monthly/quarterly filing of outward supplies
- GSTR-3B: Monthly summary return with tax payment
- E-way Bill: For movement of goods above ₹50,000
- E-invoice: Mandatory for businesses above ₹5 crore turnover
- Annual Return (GSTR-9): Yearly reconciliation