A reverse GST calculation starts from the total on a bill and finds the price before tax: divide the inclusive amount by 1 plus the rate. A ₹11,800 invoice at 18% contains ₹1,800 of GST on a ₹10,000 base. The calculator opens in remove-GST mode; pick the rate, enter the inclusive amount and read the base, the tax and the split.
Use it to check supplier invoices, to price a product so the final figure lands on a round number, and to separate the tax when only the gross amount was recorded.
GST Calculator
Goods and Services Tax is charged on top of the base price at 5%, 12%, 18% or 28%, with special rates of 3% and 0.25% for jewellery and diamonds and a list of exempt items at 0%. The GST calculator adds the tax to an exclusive price or strips it out of an inclusive one, which is the everyday problem when an invoice shows only the total. A ₹10,000 service at 18% becomes ₹11,800; a ₹11,800 bill at 18% contains ₹1,800 of tax on a ₹10,000 base.
How the tax is split depends on where buyer and seller are. For a supply within one state the amount is divided equally into CGST (to the centre) and SGST or UTGST (to the state or union territory), so 18% appears as 9% + 9% on the invoice; for a supply between states the whole amount is IGST. The calculator shows the right split for both cases. Use the custom-rate field for compensation cess or any rate not in the list, and check the current schedule for your product on the GST portal before invoicing.
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Frequently Asked Questions
How do I remove GST from a price?
Divide by 1 plus the rate: ₹11,800 ÷ 1.18 = ₹10,000. Do not subtract 18% of the inclusive price; that gives the wrong answer.
Which rate should I use?
The rate on the invoice or the rate for the product's HSN/SAC code. Use the custom field for cess or unusual rates.
Is the split always half CGST and half SGST?
For a supply within one state, yes. For a supply between states the whole tax is IGST.
