GST Explained: The One Nation, One Tax System

Since its implementation in 2017, the Goods and Services Tax (GST) has revolutionized India's indirect taxation. Here is a deep dive into how it works.

By Finance EditorUpdated: 2 February 2026

Before July 1, 2017, India had a complex web of indirect taxes—VAT, Excise Duty, Service Tax, Octroi, Luxury Tax, etc. If you manufactured a pen in Maharashtra and sold it in Karnataka, you paid multiple taxes at checkposts. GST (Goods and Services Tax) replaced all of them with a single tax structure.

1. The 3 Types of GST

Many people get confused seeing CGST and SGST on their restaurant bills. Here is the logic:

  • CGST (Central GST): Collected by the Central Government.
  • SGST (State GST): Collected by the State Government.
  • IGST (Integrated GST): Collected by the Centre for inter-state transactions.

Example Scenario

Suppose you are a trader in Mumbai (Maharashtra) selling goods worth ₹10,000. Let's assume the GST rate is 18%.

Scenario A: Selling to a customer in Pune (Maharashtra)

Since buyer and seller are in the same state, tax is split 50-50.

  • CGST (9%): ₹900
  • SGST (9%): ₹900
  • Total Tax: ₹1,800

Scenario B: Selling to a customer in Bangalore (Karnataka)

Since buyer and seller are in different states, IGST applies.

  • IGST (18%): ₹1,800
  • Total Tax: ₹1,800

Note: The Centre collects this IGST and later shares it with the destination state (Karnataka).

2. Input Tax Credit (ITC) - The Heart of GST

The biggest benefit of GST for businesses is ITC. It ensures you pay tax only on the Value Added.

How ITC Works?

  1. Step 1: You buy raw materials for ₹100 and pay ₹18 tax. (Input Tax = ₹18)
  2. Step 2: You make a product and sell it for ₹150 + ₹27 tax. (Output Tax = ₹27)
  3. Step 3: While paying tax to the govt, you subtract Input Tax from Output Tax.
  4. Tax Payable: ₹27 (Output) - ₹18 (Input) = ₹9 only.

Without ITC, tax would legally cascade (tax on tax), increasing inflation.

3. Current GST Slabs in India

SlabItems Included
0%Grains, Milk, Salt, Curd, Unbranded Food (Essentials)
5%Sugar, Spices, Tea, Coffee, Edible Oil, Economy Flights
12%Mobiles, Processed Food, Computers
18%Hair Oil, Toothpaste, Soaps, Restaurants, Electronics (Standard)
28%Cars, ACs, Refrigerators, Cement, Aerated Drinks (Luxury/Sin)

4. Composition Scheme

Small businesses with turnover up to ₹1.5 Crores can opt for the Composition Scheme. They pay a lower, flat rate of tax (1% for traders/manufacturers, 5% for restaurants) and file simpler returns. However, they cannot collect tax from customers and cannot claim ITC.

Conclusion

GST has brought transparency and formalized the Indian economy. While compliance has increased for businesses, the seamless flow of goods across state borders has been a game-changer for logistics and supply chains.

Need to calculate GST for a bill? Try our GST Calculator.

Frequently Asked Questions

Who needs to register for GST?

Any business whose turnover exceeds ₹40 Lakhs (₹20 Lakhs for service providers and special category states) must register for GST.

What is the difference between CGST, SGST, and IGST?

CGST + SGST applies to sales within the same state (Intra-state). IGST applies to sales between two different states (Inter-state).

Are there any items outside GST?

Yes. Alcohol for human consumption and Petroleum products (Petrol, Diesel, ATF) are currently outside the ambit of GST.