1. What is GST in Simple Words?
Before GST was implemented in 2017, doing business in India involved paying a tangled web of central and state taxes. A manufacturer had to pay Central Excise Duty, state VAT upon sale, Entry Tax/Octroi at city borders, Luxury Tax, and Service Tax on professional charges.
This older tax system suffered from a major problem known as the cascading effect of taxes (paying "tax on tax"). When state VAT was charged on top of central excise duty, businesses were forced to pay tax on amounts that were already taxes.
GST dismantled this entire fragmented system. As a destination-based consumption tax, GST is levied only at each point of sale where value is added, and the tax revenue goes to the state where the goods or services are actually consumed, rather than where they originated.
2. The 4 Types of GST in India
To balance revenue sharing between the Central Government and State Governments, India adopted a Dual GST Model. Under this structure, taxation depends on whether a sale is intra-state (within the same state) or inter-state (between two different states):
Levied by the Central Government on intra-state supplies of goods and services. Always charged together with SGST at exactly half the total GST rate.
Levied by the state government where the goods or services are consumed in intra-state transactions. Replaced state VAT, entry tax, and entertainment tax.
Levied on all inter-state supplies (seller and buyer in different states) as well as all imports and exports. Collected by the Centre and shared with destination states.
Applied instead of SGST in Union Territories without their own state legislature (such as Chandigarh, Lakshadweep, Daman & Diu, Andaman & Nicobar, and Ladakh).
💡 Practical Example: Intra-State vs Inter-State Tax
Suppose you sell consulting services worth ₹10,000 attracting an 18% GST rate:
SGST (9%) = ₹900
Total Invoice = ₹11,800
(No CGST or SGST applied)
Total Invoice = ₹11,800
3. Current GST Tax Slabs in India (2026)
The GST Council has categorized all goods and services into five primary tax rate tiers, plus a couple of specialized rates for precious commodities:
| GST Slab | Category | Common Goods & Services Included |
|---|---|---|
| 0% Nil Rated |
Essential Commodities | Fresh milk, fresh vegetables, unbranded food grains, flour, salt, jaggery, fresh meat, educational books, newspapers, and handloom khadi. |
| 5% Basic Rate |
Mass Consumption Items | Packaged food items, edible oils, tea, coffee, spices, sugar, life-saving medicines, footwear under ₹1,000, apparel under ₹1,000, and economy air travel. |
| 12% Standard Rate 1 |
Standard Goods & Foods | Processed foods, ghee, butter, fruit juice, mobile phones, umbrellas, business hotel rooms (₹1,000 to ₹7,500), and non-AC restaurants. |
| 18% Standard Rate 2 |
Most Goods & Services | IT services, SaaS software, telecommunications, financial services, hair oil, toothpaste, capital goods, machinery, AC restaurants, and branded garments. |
| 28% Luxury / Sin |
Demerit & Luxury Goods | Automobiles, motorbikes, air conditioners, refrigerators, cement, tobacco, aerated drinks, betting, and 5-star luxury hotels. |
| 3% & 0.25% Special Slabs |
Precious Metals & Stones | Gold, silver, platinum jewellery (3%), and cut & polished diamonds / rough precious stones (0.25%). |
4. How Input Tax Credit (ITC) Works
The core engine of GST is the Input Tax Credit (ITC) mechanism. When you purchase raw materials or services for your business, you pay GST to your supplier. When you sell your finished goods or services, you charge GST to your buyer.
Instead of remitting the entire collected GST to the government, you are permitted to subtract the GST you already paid on your purchases from the GST you collected from customers. You only deposit the net difference:
Net GST Payable = Output GST (on Sales) − Input Tax Credit (on Purchases)
For example, if you collect ₹18,000 GST on your monthly sales and you paid ₹12,000 GST on office rent, software tools, and supplies during the same month, your net tax liability to the government is just ₹6,000 (₹18,000 − ₹12,000).
5. Who Needs to Register for GST in India?
Not every business is required to get a GST registration. The government has established turnover thresholds to safeguard micro-businesses and small local shops from regulatory overhead:
- Suppliers of Goods: Annual aggregate turnover exceeding ₹40 Lakh (or ₹20 Lakh for businesses in Special Category States like Manipur, Mizoram, Nagaland, and Tripura).
- Service Providers: Annual aggregate turnover exceeding ₹20 Lakh (or ₹10 Lakh in Special Category States).
- Mandatory Registration Regardless of Turnover:
- Any person or business making inter-state taxable sales.
- Persons selling goods or services through e-commerce operators (e.g. Amazon, Flipkart, Swiggy).
- Casual taxable persons and non-resident taxable persons.
- Entities liable to pay tax under Reverse Charge Mechanism (RCM).
- Input Service Distributors (ISD).
6. Mandatory Rules for a Valid GST Invoice
Under Section 31 of the CGST Act and Rule 46 of the CGST Rules, a legally valid computer-generated GST invoice must contain all of the following mandatory components:
- Supplier Details: Name, registered business address, and 15-digit GSTIN.
- Invoice Number: A consecutive serial number not exceeding 16 characters, unique for each financial year.
- Invoice Date: Date of issuing the bill.
- Recipient Details: Name, address, and GSTIN (for B2B customers) or delivery address and state name for B2C orders over ₹50,000.
- HSN / SAC Code: 4-digit, 6-digit, or 8-digit classification codes for all goods and services.
- Taxable Value: Value of goods or services after discounts and adjustments.
- Tax Breakdown: Clear, individual line items displaying rate and amount of CGST, SGST, or IGST.
- Place of Supply (POS): The state where the delivery is deemed to occur, along with the state code.
Our Free GST Bill Maker automatically formats every invoice to comply strictly with all of these legal rules, including automated intra-state vs inter-state tax detection, HSN fields, and amount in words.