Who needs to register for GST?

Businesses with an annual turnover exceeding ₹40 lakhs (₹20 lakhs for services) must register for GST. Some businesses like e-commerce operators, inter-state suppliers, and businesses making taxable supplies regardless of turnover must also register.

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Q: What are the GST slabs in India?

India has five main GST slabs: 0% (essential goods like fresh food, milk), 5% (basic necessities), 12% (processed food, business services), 18% (most goods and services), and 28% (luxury goods, tobacco, vehicles). Most goods and services fall under the 18% slab.

Q: How do I add GST to a price?

To add GST: GST Amount = Original Price × (GST Rate ÷ 100). Final Price = Original Price + GST Amount. For example, adding 18% GST to ₹1000: GST = ₹180, Final Price = ₹1180.

Q: How do I remove GST from a price?

To remove GST from a GST-inclusive price: Original Price = GST-inclusive Price ÷ (1 + GST Rate ÷ 100). For example, removing 18% GST from ₹1180: Original Price = 1180 ÷ 1.18 = ₹1000.

Q: What is the difference between CGST and SGST?

For intra-state transactions (within the same state), GST is split equally between CGST (Central GST) and SGST (State GST). For inter-state transactions (between different states), IGST (Integrated GST) applies, which equals the combined CGST + SGST rate.

What Is GST?

GST (Goods and Services Tax) is a unified indirect tax levied on the supply of goods and services in India. Introduced in 2017, it replaced a complex web of central and state taxes with a single tax structure. GST is a destination-based, multi-stage tax — it is collected at every stage of the supply chain but ultimately paid by the end consumer.

Every business registered under GST collects tax from customers and remits it to the government, while claiming credit for the GST they've already paid on their inputs — this is called the Input Tax Credit (ITC) mechanism.

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GST Rate Slabs in India

Exempt

Fresh vegetables, milk, eggs, salt, bread

Essential

Packaged food, tea, coffee, medicines

12%

Standard

Processed food, business services, computers

18%

Standard+

Most goods & services, hotels, restaurants

28%

Luxury

Luxury cars, tobacco, aerated drinks, casinos

How to Calculate GST — Add & Remove

Adding GST to a price (exclusive to inclusive)

Add GST

GST Amount = Price × (Rate ÷ 100)

Final Price = Price + GST Amount

Example: Adding 18% GST to ₹5,000 → GST = ₹900 → Final Price = ₹5,900

Removing GST from a price (inclusive to exclusive)

Remove GST

Original Price = GST-inclusive Price ÷ (1 + Rate ÷ 100)

GST Amount = GST-inclusive Price − Original Price

Example: Removing 18% GST from ₹5,900 → Original Price = 5900 ÷ 1.18 = ₹5,000 → GST = ₹900

💡 Tip: Use ToolNinja's free GST Calculator to add or remove GST from any price in one click — no maths needed.

CGST, SGST and IGST Explained

GST in India has three components depending on the nature of the transaction:

CGST (Central GST) — Collected by the central government on intra-state transactions. Always equals SGST.
SGST (State GST) — Collected by the state government on intra-state transactions. Always equals CGST.
IGST (Integrated GST) — Collected by the central government on inter-state transactions. Equals CGST + SGST combined.

Example: An 18% GST sale within Maharashtra = 9% CGST + 9% SGST. An 18% GST sale from Maharashtra to Delhi = 18% IGST.

Practical GST Calculation Examples

Invoice for a service at 18% GST

Service fee: ₹20,000
CGST (9%): ₹1,800
SGST (9%): ₹1,800
Total invoice: ₹23,600

Retail purchase at 12% GST

Product MRP (GST-inclusive): ₹1,120
Base price: 1120 ÷ 1.12 = ₹1,000
GST amount: ₹120

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Frequently Asked Questions

India has five main GST slabs: 0% (essential goods), 5% (basic necessities), 12% (processed food, business services), 18% (most goods and services), and 28% (luxury goods, tobacco, vehicles).

GST Amount = Original Price × (GST Rate ÷ 100). Final Price = Original Price + GST Amount. For example, adding 18% GST to ₹1000: GST = ₹180, Final Price = ₹1180.

Original Price = GST-inclusive Price ÷ (1 + GST Rate ÷ 100). For example, removing 18% GST from ₹1180: Original Price = 1180 ÷ 1.18 = ₹1000.

For intra-state transactions, GST is split equally between CGST (Central GST) and SGST (State GST). For inter-state transactions, IGST (Integrated GST) applies, which equals the combined CGST + SGST rate.

Businesses with an annual turnover exceeding ₹40 lakhs (₹20 lakhs for services) must register for GST. E-commerce operators, inter-state suppliers, and some other categories must also register regardless of turnover.