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How to use it
Choose whether to add or remove GST, enter the amount, pick the rate and whether the sale is within your state or to another state.
Questions
How do I calculate GST on an amount?
Multiply the amount before tax by the rate and divide by 100. For ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180.
How do I remove GST from an inclusive price?
Divide by 1 plus the rate. For ₹1,180 including 18% GST, the taxable value is 1,180 ÷ 1.18 = ₹1,000 and the GST is ₹180.
When is it CGST and SGST, and when IGST?
A sale within one state is split equally into CGST and SGST (or UTGST). A sale to another state, or an import, carries IGST at the full rate.
What are the GST rates now?
Since 22 September 2025 the main rates are 5% and 18%, with 40% for a small group of luxury and sin goods, and special rates such as 3% for gold. Check the rate for your product on the CBIC website.