How do I remove 18% GST from a total?

Divide by 1.18. For ₹1,180 the taxable value is ₹1,000 and the GST is ₹180.

When is it IGST instead of CGST and SGST?

When the supplier and the place of supply are in different states. Within the same state it is CGST plus SGST, each half the rate.

Which GST rate applies to my product or service?

It depends on its HSN or SAC code and changes from time to time. Check the current rate notified by the GST Council, or ask your accountant.

GST calculator: add or remove GST, CGST, SGST and IGST

Amount (₹)GST rateCheck the current rate for your HSN or SAC code; rates change.The amount isSupply

Total with GST: ₹11,800.00
Taxable value: ₹10,000.00
GST at 18%: ₹1,800.00
CGST (9%): ₹900.00
SGST (9%): ₹900.00

How it is worked out

Adding GST: tax = amount × rate ÷ 100; total = amount + tax.
Removing GST: taxable value = amount ÷ (1 + rate ÷ 100); tax = amount − taxable value.
Within one state the tax is split equally into CGST and SGST; between states it is all IGST.

Questions

How do I remove 18% GST from a total?: Divide by 1.18. For ₹1,180 the taxable value is ₹1,000 and the GST is ₹180.
When is it IGST instead of CGST and SGST?: When the supplier and the place of supply are in different states. Within the same state it is CGST plus SGST, each half the rate.
Which GST rate applies to my product or service?: It depends on its HSN or SAC code and changes from time to time. Check the current rate notified by the GST Council, or ask your accountant.

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Results use standard formulas and typical values. Use them for estimating and planning; check critical figures against the drawing, the material certificate or the maker's data.