Goods and Services Tax (GST) in India: What It Is, How It Works & Everything Else You Need to Know
Eight years in, and GST still confuses a lot of people. Whether you're a business owner trying to figure out gst registration, a student studying indirect taxes, or someone who just wants to understand what that tax line on an invoice actually means — this guide covers it all.
GST, or goods and services tax, is an indirect tax levied on the supply of goods and services across India. It replaced a complicated web of taxes — VAT, excise duty, service tax — with one unified system. One nation, one tax. That was the idea, anyway.
Goods and Services Tax (GST) is an indirect tax that replaced most of the earlier indirect taxes in India — excise duty, VAT, service tax, and several others. The Goods and Service Tax Act was passed in Parliament on 29th March 2017 and came into effect on 1st July 2017.
Under the good service tax GST framework, tax is levied on the supply of goods and services at every stage of the value chain. It's a comprehensive, multi-stage, destination-based tax — which sounds complicated, but breaks down quite simply.
For intra-state sales, both Central GST (CGST) and State GST (SGST) are charged. For inter-state sales, Integrated GST (IGST) applies. The gstportal at www.gst.gov.in handles everything from registration to return filing to refunds.
Three concepts define how goods & services tax GST operates. Understanding these makes everything else click.
Multi-Stage Tax
Goods change hands multiple times before reaching the final consumer. A product moves through raw material purchase, manufacturing, warehousing, wholesale, retail, and final sale. GST is levied at each of these stages — which is why it's called a multi-stage tax.
Value Addition at Every Stage
A biscuit manufacturer buys flour, sugar, and other ingredients. When these are mixed and baked into biscuits, value is added. The manufacturer sells to a warehouse agent, who packs them in cartons and labels them — more value added. The retailer then packages them in smaller quantities and invests in marketing — value added again.
GST is charged on the value added at each of these stages, not on the total accumulated cost. That's a key distinction from the old system.
Destination-Based Collection
Under goods and services tax GST, the tax revenue goes to the state where the goods are finally consumed — not where they were manufactured. So if goods are made in Maharashtra but sold to a consumer in Karnataka, Karnataka gets the tax revenue. This was a significant shift from the earlier regime.
The idea of a unified goods of service tax wasn't new. The groundwork started two decades before it actually launched.
Year
Key Milestone
2000
PM Vajpayee set up a committee to draft GST law
2006
Finance Minister proposes GST introduction from April 1, 2010
2008
EC finalises dual GST structure with separate levy and legislation
2014
GST Bill reintroduced in Parliament by Finance Minister
2016
GSTIN goes live
2017
Four supplementary GST bills passed in both houses
1st July 2017
GST officially launched across India
Seventeen years from concept to reality. That's how long it took to get goods and services tax registration off the ground at a national level.
The goals behind goods & service tax registration went beyond just tax simplification.
One Nation, One Tax. Every state now follows the same rate for a particular product or service. No more confusion about which state charges what.
Subsuming multiple indirect taxes. Service tax, VAT, Central Excise, and several others were all pulled under the GST umbrella. The gst login portal became the single point for everything.
Eliminating the cascading effect. Under the old regime, tax was charged on tax. A manufacturer paid excise duty, then VAT was charged on top of that. GST broke that cycle — tax is levied only on net value added at each stage.
Curbing tax evasion. Taxpayers can claim input tax credit only on invoices uploaded by their suppliers. Fake invoice claims became significantly harder. E-invoicing has tightened this further.
Widening the taxpayer base. GST applies to both goods and services, pulling in a much larger section of the economy. Turnover thresholds for gst registration are defined, bringing more businesses into the formal tax net.
Online procedures. Everything — from goods and services tax registration to return filing to refunds to e-way bill generation — is handled through the gstportal. It's contributed meaningfully to ease of doing business in India.
Logistics improvement. GST minimises transportation cycle times, reduces warehouse duplication, and improves supply chain efficiency.
Competitive pricing. The cascading tax effect under the old regime pushed up prices of Indian goods compared to global markets. GST helped correct that.
The removal of the cascading effect alone made a significant difference to the cost of goods. Beyond that:
There are three taxes under the goods and services tax system:
CGST (Central GST): Collected by the Central Government on intra-state sales — for example, a transaction happening entirely within Maharashtra.
SGST/UTGST (State/Union Territory GST): Collected by the state or union territory government on intra-state sales — same Maharashtra example, the state gets its share.
IGST (Integrated GST): Collected by the Central Government on inter-state sales — for example, a sale from Maharashtra to Tamil Nadu.
Transaction
New Regime
Old Regime
Revenue Distribution
Sale within State/UT
CGST + SGST/UTGST
VAT + Central Excise/Service Tax
Shared equally between Centre and State
Sale to another State
IGST
CST + Excise/Service Tax
Centre shares IGST based on destination
Example: A Gujarat dealer sells goods worth ₹50,000 to a Punjab dealer. At 18% IGST, the dealer charges ₹9,000 — this goes to the Central Government.
The same dealer sells goods worth ₹50,000 to a consumer within Gujarat at 12% GST (6% CGST + 6% SGST). The dealer collects ₹6,000 — ₹3,000 goes to the Centre, ₹3,000 to Gujarat.
A business registered under gst must issue invoices with the applicable GST rate charged on the value of supply.
The primary GST slabs for regular taxpayers are:
There are also lesser-used rates of 3% and 0.25% for specific categories. CGST and SGST rates for intra-state transactions are equal — each is half the total GST rate. IGST for inter-state transactions is the combined total.
Before goods and services tax, the indirect tax landscape in India was a patchwork of overlapping levies.
States collected VAT — but every state had different rules and rates. The Centre collected excise duty on manufactured goods and Central Sales Tax on inter-state sales. Entertainment tax, octroi, and local taxes were levied at multiple levels, often by both state and Centre simultaneously.
This created the cascading effect. When goods were manufactured and sold, excise duty was charged. Then VAT was charged on the price that already included excise duty — a tax on top of a tax. Prices ballooned.
Taxes subsumed under GST: Central Excise Duty, Duties of Excise, Additional Duties of Excise, Additional Duties of Customs, Special Additional Duty of Customs, Cess, State VAT, Central Sales Tax, Purchase Tax, Luxury Tax, Entertainment Tax, Entry Tax, Taxes on advertisements, Taxes on lotteries and gambling.
Taxes still outside GST: Basic Customs Duty, taxes on petrol and diesel, tobacco and alcohol, stamp duty on property, electricity duty, vehicle tax, property tax.
Petroleum products — crude oil, high-speed diesel, petrol, natural gas, aviation turbine fuel — and alcoholic liquor remain outside the GST framework. The concessional 2% CST via Form C still applies for specific uses including resale, manufacturing, telecom, mining, and power generation.
Under the old system, tax was charged on the full accumulated cost at each stage. Here's what that looked like for a biscuit manufacturer:
Old regime (10% tax rate):
Stage
Cost (₹)
Tax at 10% (₹)
Invoice Total (₹)
Manufacturer
1,000
100
1,100
Warehouse adds label, repacks (+₹300)
1,400
140
1,540
Retailer advertises (+₹500)
2,040
204
2,244
Total
1,800
444
Under GST (10% rate, input credit claimed):
GST at 10% (₹)
Tax Deposited (₹)
Warehouse (+₹300)
1,300
130
30
1,430
Retailer (+₹500)
180
50
1,980
The final price drops from ₹2,244 to ₹1,980. The tax burden on the end consumer reduces — not because the rate went down, but because input tax credit eliminates the compounding effect. Every time a business claims input credit, the sale price drops. That saving gets passed down the chain.
GST didn't just simplify the old system — it brought in new compliance frameworks too.
Launched on 1st April 2018 for inter-state movement and 15th April 2018 for intra-state movement, e-way bills created a centralised digital tracking system for goods in transit. Manufacturers, traders, and transporters generate e-way bills through the gstportal. It reduced delays at checkposts and significantly tightened tracking of goods movement.
Applicable from 1st October 2020, e-invoicing was introduced in phases. As of 1st August 2023, it applies to all businesses with an annual aggregate turnover exceeding ₹5 crore in any financial year since 2017-18.
These businesses must obtain a unique Invoice Reference Number (IRN) for every B2B invoice by uploading it to the GSTN's Invoice Registration Portal. The portal verifies the invoice, then authorises it with a digital signature and QR code.
E-invoicing allows different systems to read and process invoices uniformly, reduces data entry errors, and directly passes invoice data to the GST portal and e-way bill portal — eliminating manual entry for GSTR-1 filing.
GSTIN — Goods and Services Tax Identification Number — is a 15-digit PAN-based unique identification number assigned to every registered taxpayer under GST. Think of it as a business's identity on the gstgovin platform.
For a gst number search, visit the GST portal at www.gst.gov.in and use the "Search Taxpayer" option. You can also use the legaldev gst search tool to verify any GSTIN quickly.
The GSTIN format: first two digits are the state code, next ten are the PAN, followed by the entity number, a blank, and a check digit.
Q: What does GST mean and what is its full form?
A: GST stands for Goods and Services Tax. It is an indirect tax levied on the supply of goods and services across India. The Goods and Service Tax Act came into effect on 1st July 2017, replacing multiple earlier indirect taxes including VAT, excise duty, and service tax.
Q: How do I do a GST number search online?
A: To do a gst number search, visit the official GST portal at www.gst.gov.in and click on "Search Taxpayer." Enter the GSTIN or the business name to verify registration details. The legaldev gstsearch tool also lets you verify any GSTIN quickly without navigating the full gstgovin portal.
Q: What is the process for GST registration in India?
A: GST registration is done entirely online through the gstportal at www.gst.gov.in. Businesses with turnover above the prescribed threshold must register — ₹40 lakh for goods and ₹20 lakh for services in most states. The application requires PAN, Aadhaar, business address proof, and bank account details. Once approved, a GSTIN is allotted.
Q: What are the current GST rates in India?
A: The primary GST slabs are 0% (nil-rated), 5%, 12%, 18%, and 28%. Essential commodities typically fall in the 0% or 5% bracket, while luxury and demerit goods attract 28%. There are also specific rates of 3% and 0.25% for certain goods. For inter-state transactions, the IGST rate equals the combined CGST and SGST rate applicable.
Q: What is the difference between CGST, SGST, and IGST?
A: CGST and SGST are both charged on intra-state transactions — the Centre and the state each get an equal share. IGST is charged on inter-state transactions and goes entirely to the Centre, which then distributes it based on the destination state. For example, a sale within Gujarat attracts CGST plus SGST, while a sale from Gujarat to Maharashtra attracts only IGST.
Q: How do I log in to the GST portal?
A: GST login is done through the official gstportal at www.gst.gov.in. Click "Login" on the homepage, enter your registered username and password, and complete the CAPTCHA. First-time users need to complete goods and services tax registration before a login credential is created. The portal handles everything — return filing, payment, e-way bills, and more.
Q: What is e-invoicing under GST and who does it apply to?
A: E-invoicing requires eligible businesses to upload every B2B invoice to the GSTN Invoice Registration Portal to get a unique Invoice Reference Number. As of August 2023, it applies to businesses with annual turnover above ₹5 crore. The system reduces errors, enables direct data flow to the GST portal, and eliminates manual GSTR-1 data entry.
Q: Can I check my GST registration status online?
A: Yes. After submitting a goods and services tax registration application on the gstgovin portal, you can track the application status using the ARN (Application Reference Number) provided at submission. Log in to the gstportal, go to "Services," then "Registration," and click "Track Application Status." The status updates in real time.
Q: What happens if I don't register for GST when required?
A: Operating without mandatory gst registration attracts penalties under the GST Act — a penalty of 10% of the tax due subject to a minimum of ₹10,000, or 100% of the tax due in cases of deliberate tax evasion. Businesses may also face interest on outstanding tax dues and restrictions on input tax credit claims.
Q: What is the composition scheme under GST?
A: The composition scheme under goods and services tax is a simplified option for small businesses with annual turnover up to ₹1.5 crore (₹75 lakh for some states). Instead of regular GST rates and monthly filings, eligible businesses pay a flat rate of tax and file returns quarterly. However, they cannot collect GST from customers or claim input tax credit.
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