Free tool
GST calculator: add or remove GST
Work out CGST and SGST, or IGST, on any amount at the rates in force since 22 September 2025.
The rate a supply attracts comes from its HSN or SAC code — this shows what happens to the rate you pick, not which rate is right for your work.
Adding GST to a price
GST is the taxable value times the rate. At 18% on ₹10,000, that is ₹1,800, and the invoice total is ₹11,800. The taxable value is the price before tax — after any discount shown on the invoice.
Taking GST out of an inclusive price
When a price already includes GST, the value before tax is the price × 100 ÷ (100 + rate), and the GST is what is left. ₹11,800 including 18% GST is ₹10,000 plus ₹1,800 of tax. Taking 18% of ₹11,800 instead would give ₹2,124 — a mistake that overstates the tax.
CGST and SGST, or IGST
A supply inside your own state splits the rate in two: half central tax (CGST), half state tax (SGST) — 9% and 9% for 18%. A supply to another state carries the whole rate as integrated tax (IGST). The total is the same either way; what decides it is the place of supply, not the rate.
The GST rates since 22 September 2025
The GST Council folded the old 12% and 28% slabs into a simpler set, in force from 22 September 2025: 5% for essentials, 18% as the standard rate, and 40% for a short list of luxury and sin goods, besides nil-rated supplies. Special rates continue for a few goods, such as 3% on gold, silver and jewellery and 0.25% on rough precious stones.
Which rate applies to you
That comes from the HSN code of the goods or the SAC code of the service, and the rate notified against it — not from this page. This calculator does the arithmetic for the rate you choose; it is not tax advice.
Common questions
How much is 18% GST on ₹10,000?
₹1,800, so the total is ₹11,800. Within your own state that is CGST ₹900 and SGST ₹900; to another state it is IGST ₹1,800.
How do I remove GST from a price?
Divide the price by (100 + rate) and multiply by 100 to get the value before GST; the rest is the tax. For ₹5,900 including 18%: ₹5,900 × 100 ÷ 118 = ₹5,000, so the GST is ₹900.
Are 12% and 28% GST rates still used?
Not as slabs. From 22 September 2025 they were folded into 5%, 18% and 40%, so most goods and services that were at 12% or 28% now sit in one of those.
Why is CGST + SGST the same as IGST?
Because it is one rate, divided differently. Inside a state, central and state government each take half; across a state line, integrated tax carries the whole and the states settle between themselves.
Invovibe works this out on every invoice you raise, from the place of supply, and carries it into your GSTR-1.
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