Understanding GST in India: The Complete 2026 Guide
GST replaced 17 taxes in 2017. Here is everything you need to know about how it works, who must register, and how to calculate it.
Goods and Services Tax (GST) has transformed Indian taxation since its launch on 1 July 2017. It replaced a complex web of 17 central and state taxes — VAT, excise duty, service tax, entry tax, and others — with a single unified system. Nine years on, it remains one of the most significant tax reforms in India's history. This guide explains everything you need to understand as a business owner, freelancer, or consumer. Every number in this guide can be reproduced with the GST calculator, GST calculation guide and the inclusive vs exclusive GST — open them alongside as you read.
What is GST?
GST is a multi-stage, destination-based consumption tax levied on the supply of goods and services. "Multi-stage" means it is applied at each stage of the supply chain — from manufacturer to wholesaler to retailer to consumer. "Destination-based" means the tax revenue goes to the state where the goods or services are finally consumed, not where they are produced.
The key innovation that makes GST efficient: Input Tax Credit (ITC). Every business that pays GST on its purchases can claim a credit against the GST it collects on its sales. This means GST is effectively paid only on the value added at each stage — eliminating the cascading "tax on tax" problem that plagued the old regime.
GST rate slabs — what is taxed at what rate?
| Rate | Category | Key Examples |
|---|---|---|
| 0% (Exempt) | Essentials and public services | Fresh fruits and vegetables, milk, curd, eggs, bread, salt, educational services (pre-primary to university), healthcare and hospital services, hotel rooms under ₹1,000/night |
| 5% | Basic necessities and essential goods | Packaged food, frozen vegetables, coal, small restaurants (non-AC), economy air travel, life-saving drugs, agarbatti |
| 12% | Standard goods and intermediate | Smartphones, computers, processed food, business class air travel, hotels ₹1,000–₹7,500/night, construction services |
| 18% | Most services and goods | AC restaurants, hotels above ₹7,500/night, financial services, banking, insurance, telecom, electronics, most manufactured goods, IT services, most professional services |
| 28% | Luxury and sin goods | Luxury cars, SUVs, cigarettes, tobacco, aerated drinks, casinos, online gaming with real money |
Some goods attract both GST and Compensation Cess (additional levy on certain goods to compensate states for GST transition losses). Fuel products (petrol, diesel, ATF) remain outside GST and are taxed under state VAT and central excise.
CGST, SGST, and IGST — what is the difference?
GST is shared between the central and state governments. The way it is split depends on whether the transaction is within one state or across state lines:
Intrastate supply (same state)
When seller and buyer are in the same state, the GST is split equally: half goes to the central government as CGST (Central GST) and half to the state government as SGST (State GST). On an 18% GST transaction, the split is 9% CGST + 9% SGST.
Interstate supply (different states)
When seller and buyer are in different states, the full GST is collected as IGST (Integrated GST) by the central government. The central government then distributes the state's share to the destination state. On the same 18% transaction, the seller charges 18% IGST instead of splitting it.
Why this matters for businesses
ITC credit can be set off across types: IGST credit can offset CGST, SGST, or IGST liability. CGST credit can only offset CGST or IGST. SGST credit can only offset SGST or IGST. Getting this wrong in your GST returns leads to mismatches and notices.
GST registration: who must register?
| Business Type | Threshold |
|---|---|
| Goods supplier (normal states) | Annual turnover > ₹40 lakh |
| Service provider | Annual turnover > ₹20 lakh |
| Special category states (Northeast, hilly states) | Annual turnover > ₹10 lakh |
| E-commerce operators and sellers | Mandatory regardless of turnover |
| Interstate suppliers | Mandatory regardless of turnover |
| Persons liable for reverse charge | Mandatory regardless of turnover |
Voluntary registration is also possible for businesses below the threshold — useful if you want to claim ITC on business purchases or supply to registered businesses who require GST invoices.
How to calculate GST
Adding GST to a base price:
GST Amount = Base Price × (GST Rate ÷ 100)
GST-inclusive price = Base Price + GST Amount
Example: ₹10,000 service at 18% GST: GST = ₹1,800. Invoice total = ₹11,800. CGST = ₹900, SGST = ₹900 (intrastate).
Removing GST from a GST-inclusive price (reverse calculation):
Base Price = GST-inclusive Price × 100 ÷ (100 + GST Rate)
GST Amount = GST-inclusive Price − Base Price
Example: Price tag of ₹11,800 (18% included): Base = ₹11,800 × 100/118 = ₹10,000. GST = ₹1,800.
Input Tax Credit (ITC) — the key to GST efficiency
ITC allows a registered taxpayer to offset the GST paid on purchases against the GST collected on sales. This prevents double taxation and is the mechanism that makes GST more efficient than the old regime.
Example: Manufacturer pays ₹18,000 GST on raw materials. Sells finished goods and collects ₹36,000 GST from customers. Net GST payable to government: ₹36,000 − ₹18,000 = ₹18,000. The ₹18,000 already paid is not lost — it is credited against the liability.
ITC cannot be claimed for: personal consumption, goods/services used for exempt supplies, motor vehicles (with exceptions), and goods/services on which the supplier has not filed GST returns. Matching supplier invoices in GSTR-2B is essential for ITC claims. When you finish here, the guides on what is a good blood pressure and when is mortgage refinancing worth it continue the series.
GST returns: key filing requirements
| Return | Who Files | Frequency | Contents |
|---|---|---|---|
| GSTR-1 | All registered taxpayers (outward supply) | Monthly/Quarterly | Details of all sales invoices |
| GSTR-3B | All registered taxpayers | Monthly | Summary of sales, ITC, and tax payable |
| GSTR-9 | Annual return (if turnover > ₹2 crore) | Annual | Reconciliation of all returns filed |
| GSTR-4 | Composition scheme taxpayers | Annual | Simplified return for small businesses |
Frequently asked questions about GST
What is the GST on freelance services? Freelance services are taxable at 18% GST. If your annual turnover from freelancing exceeds ₹20 lakh (₹10 lakh in special category states), GST registration is mandatory. Below this threshold, registration is optional — you cannot charge GST to clients or claim ITC without being registered.
Is GST applicable on rent? Residential property rented to an individual for personal use is GST-exempt. Commercial property rental attracts 18% GST. From October 2023, residential property rented to a registered business (e.g., company-provided accommodation) also attracts 18% GST under the reverse charge mechanism, payable by the company tenant.
What is the Composition Scheme? The Composition Scheme allows small businesses (turnover up to ₹1.5 crore for goods, ₹50 lakh for services) to pay GST at a flat rate (1–5%) on turnover instead of the regular slab rate, with simplified compliance. The trade-off: they cannot collect GST from customers, cannot claim ITC, and cannot supply interstate. Ideal for small, local businesses with low input costs.
Can I claim GST on business expenses? Yes — on goods and services used for your taxable business activities. Keep all invoices with GST numbers, ensure suppliers are GST-registered, and verify that invoices appear in your GSTR-2B (auto-populated from supplier filings). Missing from GSTR-2B = ITC claim disallowed.
GST rate slabs for common products and services (2026)
| GST Rate | Category | Examples |
|---|---|---|
| 0% (Nil) | Essentials | Fresh vegetables, milk, eggs, cereals, books, newspapers, sanitary napkins |
| 5% | Common goods | Packaged food, tea, coffee, edible oil, footwear under ₹1,000, economy hotels |
| 12% | Standard goods | Processed food, computers, mobile phones (non-smart), agarbatti |
| 18% | Most services and goods | Restaurants, air travel, car services, most electronics, IT services, financial services |
| 28% | Luxury and sin goods | Cars, air conditioners, tobacco, pan masala, high-end hotels |
| 28% + Cess | Demerit goods | Cigarettes (28% + 5–36% cess), SUVs (28% + 22% cess), coal (28% + ₹400/tonne) |
Input Tax Credit (ITC): how businesses recover GST paid
A GST-registered business can claim Input Tax Credit — deducting GST paid on purchases from GST collected on sales. Example: You buy raw material for ₹1,00,000 + 18% GST = ₹1,18,000 paid. You sell finished goods for ₹1,50,000 + 18% GST = ₹27,000 collected. GST payable to government = ₹27,000 − ₹18,000 (ITC) = ₹9,000. Only net GST flows to the government — the tax cascading effect of the pre-GST system is eliminated. To claim ITC: the supplier must have filed their GSTR-1, you must have a valid tax invoice, and the goods/services must be used for business purposes. Use our GST calculator to compute GST on any transaction.
GST filing: GSTR-1, GSTR-3B, and annual return
GST-registered businesses must file multiple returns. Key returns for small businesses and freelancers: GSTR-1 (outward supplies): monthly by 11th (if quarterly, by 13th of quarter-end month). Lists all sales invoices. GSTR-3B (summary return + tax payment): monthly by 20th. Net tax payable (collected minus input credit) must be paid with this return. GSTR-9 (annual return): by December 31st of following year. Reconciles all monthly filings. Late filing penalties: ₹50/day for GSTR-1 (₹25 CGST + ₹25 SGST). ₹50/day for GSTR-3B. Maximum late fee: ₹10,000 per return. Interest on late payment: 18% p.a. on unpaid tax. The simplest compliance tip: set calendar reminders for the 10th (to compile invoices) and 18th (to calculate and pay tax) of every month — giving two days buffer before the actual deadlines. Use our GST calculator for all invoice calculations.
Which goods are completely exempt from GST in India?
Nil-rated goods (0% GST) include: fresh vegetables, fresh fruits, milk, eggs, bread, unbranded atta and rice, educational services, basic health services, and fresh meat and fish. Some services like rental of residential dwellings below ₹20,000/month and public transportation are also exempt. Check the latest CBIC notification for a complete list as exemptions are updated periodically.
What is the GST registration threshold for small businesses?
Businesses must register for GST if annual turnover exceeds ₹40 lakh for goods (₹20 lakh in special category states) or ₹20 lakh for services (₹10 lakh in special category states). The composition scheme is available for businesses up to ₹1.5 crore turnover — they pay a flat 1–5% rate without input tax credit. E-commerce sellers must register regardless of turnover.
Sources & references
Sources: CGST Act 2017; CBIC rate notifications; GST Council press releases; gst.gov.in official portal.
📋 Financial disclaimer: This guide is educational and not investment, tax, or legal advice. Rates, slabs, and returns reflect published FY 2025-26 rules and historical data; outcomes depend on your circumstances. Consult a SEBI-registered advisor or chartered accountant for personal decisions — see methodology.