India GST Calculator

Add GST to a base price, or work out the GST already included in a price — with the CGST + SGST or IGST split.

  • Free, updates instantly as you type
  • Current 5%, 18% and 40% slabs, the old 12% and 28% for earlier invoices, or a custom rate
₹0 total (GST included)
Base amount
₹0
CGST
₹0
SGST
₹0

India simplified GST on 22 September 2025: the 12% and 28% slabs were abolished, leaving 5%, 18% and a 40% rate for luxury and sin goods (plus nil-rated items). The old slabs are listed only for invoices dated before that day, because the rate that applies is the one in force on the date of supply. Check the official GST portal for the rate on your specific goods or services before filing or invoicing.

Frequently asked questions

What's the difference between CGST, SGST, and IGST?

For sales within the same state, GST splits evenly into CGST (to the central government) and SGST (to the state government) — each half the total rate. For sales between states, the full amount is charged as IGST instead.

How do I remove GST from a total price?

Switch to "Remove GST" and enter the GST-inclusive total. The calculator divides by (1 + rate/100) to find the base amount, then shows the GST portion separately.

Which GST slab applies to my product?

This calculator doesn't look up rates by product — you choose the rate. Since 22 September 2025, most goods and services fall under 5% or 18%, a narrow set of luxury and sin goods are taxed at 40%, and many essentials are nil-rated. A few items have special rates (for example 3% on gold and 0.25% on rough diamonds, which you can enter as a custom rate). Always confirm the rate for your goods or services on the official GST portal.

What happened to the 12% and 28% GST slabs?

They were abolished by the GST 2.0 reform, effective 22 September 2025. Most items that were at 12% moved to 5%, most at 28% moved to 18%, and luxury and sin goods moved to a new 40% rate. The old slabs remain in the dropdown only so you can work out invoices dated before that change.

Which rate applies if my invoice is from before the change?

The rate in force on the date of supply applies. For a supply made before 22 September 2025, use the old slab from the dropdown; for one made on or after that date, use the current slabs.

How GST is added and removed

GST is charged as a percentage of the price before tax. The calculator works in two directions:

  • Adding GST: GST = base price × rate ÷ 100, and the total is the base price plus GST.
  • Removing GST: base price = total ÷ (1 + rate ÷ 100). Then GST is the total minus the base price. Note that you divide; subtracting the rate from the total gives the wrong answer.

A worked example

A product costs ₹10,000 before tax and is taxed at 18%. GST is ₹1,800 and the total is ₹11,800. If the sale is within one state, that ₹1,800 is shown as CGST ₹900 + SGST ₹900; if it crosses state lines, the full ₹1,800 is IGST.

Working backwards from a GST-inclusive price of ₹11,800 at 18%: ₹11,800 ÷ 1.18 = ₹10,000 before tax, with ₹1,800 of GST. (Taking 18% off ₹11,800 would give ₹9,676, which is wrong.)

At the 5% rate, ₹1,000 becomes ₹1,050; at the 40% rate, ₹10,000 becomes ₹14,000.

Which rate applies?

India simplified GST on 22 September 2025: the 12% and 28% slabs were abolished, leaving 5% and 18% as the main rates, a 40% rate for a narrow set of luxury and sin goods, and nil rates for many essentials. A few items have special rates, such as 3% on gold. The rate that applies is the one in force on the date of supply, which is why the older slabs remain in the calculator for invoices dated before the change. This calculator doesn't look up products: choose the rate that applies to your goods or services, and check the official GST portal or your accountant if you're unsure.

Good to know

  • Businesses registered under GST can usually claim input tax credit on the GST they pay on purchases, so the tax is ultimately borne by the final customer. Ask your accountant how this applies to you.
  • Invoices have their own rules for rounding and for showing the tax split; follow the guidance on the GST portal when invoicing.
  • This calculator is an aid for estimating prices and checking invoices. It is not tax advice.

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