How do I remove GST from an inclusive price?

Divide the inclusive amount by (1 + rate/100). For ₹1,180 at 18%: 1180 ÷ 1.18 = ₹1,000 base and ₹180 GST. Pick 'Remove GST' above and the calculator does this for you.

When is it CGST + SGST and when is it IGST?

If the seller and buyer are in the same state, the tax splits equally into CGST and SGST. If they are in different states, the whole amount is charged as IGST. The total tax is the same either way.

What are the GST rates in India?

The main slabs are 0%, 5%, 12%, 18% and 28%. Most services fall under 18%.

GST Calculator — CGST, SGST & IGST online

Amount

₹

Mode

The amount is the base — GST gets added on top.

GST rate

Supply

Total

₹0.00

Base amount: ₹0.00
CGST (9%): ₹0.00
SGST (9%): ₹0.00
IGST (18%): ₹0.00
Total GST: ₹0.00

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How the calculation works

Adding GST to a base price: tax = base × rate ÷ 100. Removing GST from an inclusive price: base = inclusive ÷ (1 + rate ÷ 100) — so ₹1,180 at 18% is ₹1,000 base + ₹180 tax, not ₹1,180 − 18%.

CGST + SGST or IGST?

Same state on both sides → the tax splits equally into CGST and SGST. Different states → the whole amount is IGST. The total is identical either way; only the split on the invoice changes — which is why an invoicing tool should derive it from the two GSTINs, not ask you.