BillmanWhat is GST?
GST (Goods and Services Tax) is India’s tax on the supply of goods and services. It started on 1 July 2017 and replaced VAT, excise, service tax and several other taxes with one tax across the country.
GST is collected at every step from maker to shop to customer. A registered business charges GST on its sales and takes credit for the GST it paid on purchases (input tax credit), so it only pays tax on the value it adds. The customer pays the full GST in the price.
How to use this GST calculator
- Type the amount.
- Pick the GST rate, or type any other rate in the “Other” box.
- Choose whether the amount already includes GST (to remove it) or excludes GST (to add it).
- Choose within state for the CGST + SGST split, or other state for IGST.
- The taxable value, GST and total update as you type. Tap Copy result to paste it anywhere.
GST rates in India
| Rate | Used for |
|---|---|
| 0% | Essentials such as fresh food and some basic items |
| 5% | Many everyday goods |
| 18% | Most goods and services |
| 40% | Luxury and sin goods |
| 3% | Gold, silver and jewellery |
| 0.25% | Rough diamonds |
Main slabs since GST 2.0 (22 September 2025); 12% and 28% remain for a few items. Find your item’s rate by its HSN code on cbic-gst.gov.in.
CGST, SGST and IGST
When the seller and the buyer are in the same state, GST is split into two equal halves: CGST goes to the centre and SGST to the state. At 18%, that is 9% CGST + 9% SGST.
When goods or services go to another state, the full GST is charged as IGST. At 18%, that is 18% IGST. The total tax is the same; only the split changes. In Union Territories without a legislature, UTGST takes the place of SGST.
GST-inclusive and GST-exclusive prices
A GST-exclusive price is before tax: GST is added on top. A GST-inclusive price, such as the MRP on a packet, already has GST inside it. To find the GST inside, divide; don’t subtract.
The most common GST mistake
To take 18% GST out of ₹1,180, do not subtract 18%. ₹1,180 minus 18% is ₹967.60, which is wrong. Divide instead: ₹1,180 ÷ 1.18 = ₹1,000, so the GST is ₹180. This calculator does that for you.