Free tool
Add GST to a price or take it out of one, and see CGST and SGST or IGST at today’s rates, rounded to the paisa once, exactly as BillCountr prints a bill.
Result
GST ₹180. Amount with GST ₹1,180.
Worked to the paisa and rounded once, the same way BillCountr prints a bill.
What you need to know
4 topics
01 · Adding GST
Multiply the price by the rate and divide by a hundred: that is the GST. Add it to the price for the total. ₹1,000 plus 18% GST is ₹1,180: ₹180 of tax, split ₹90 CGST and ₹90 SGST.
02 · Removing GST
Most shop prices already include GST, so the tax has to be taken out, not added. Divide the price by one hundred plus the rate, and multiply by a hundred: that is the taxable value, and the rest is tax. ₹1,180 including 18% GST is ₹1,000 of goods and ₹180 of tax.
03 · The split
A sale to a buyer in your own state carries two taxes of equal size: CGST, which goes to the centre, and SGST, which goes to the state. Each is half the rate. A sale to a buyer in another state carries one tax, IGST, at the full rate. The customer pays the same total either way; only the lines on the bill differ. In a union territory without its own legislature, such as Chandigarh, UTGST takes the place of SGST. When the tax comes to an odd number of paise, the extra paisa goes to SGST, so the two halves always add back to the whole.
04 · Rates
Most goods are taxed at 5% or 18%, some at nil, and a short list of luxury and sin goods at 40%. Gold, silver and jewellery articles have their own rate, and rough diamonds another. The 12% and 28% slabs are gone: most goods moved off them when GST 2.0 took effect on 22 September 2025, and the last ones, tobacco and pan masala, on 1 February 2026. That is why this calculator does not offer them. Which rate applies depends on the exact product, and its HSN code is where to start looking.
Common questions
Multiply the price by the rate and divide by a hundred, then add that to the price. ₹1,000 plus 18% GST is ₹1,180: ₹180 of tax, split ₹90 CGST and ₹90 SGST.
Divide the price by (100 + rate) and multiply by 100 to get the taxable value; the difference is the GST. ₹1,180 including 18% GST is ₹1,000 of goods and ₹180 of tax.
CGST and SGST are charged together on a sale inside one state, each at half the rate; IGST is charged alone, at the full rate, on a sale from one state to another. The total tax is the same.
Because of when rounding happens. This calculator, like BillCountr's bills, works in paise and rounds once, half up, at the end of the calculation. A calculator that rounds each step separately can land a paisa away.
It works out one amount at one rate. A bill with items at different rates is taxed line by line, which is what BillCountr does when you make the bill.
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