Finance
GST calculator
Calculate Indian Goods and Services Tax (GST), CGST, SGST, IGST, and net/gross invoice values client-side.
GST inclusive vs exclusive (and UK VAT)
Same arithmetic as VAT. India then splits the tax for intra-state invoices.
Updated 2026-09-07.
Two directions
Exclusive: you know the taxable value. Tax = net × rate/100. Gross = net + tax. Inclusive: you know the shelf price. Net = gross / (1 + rate/100). Tax = gross − net.
Indian GST uses this for every slab (0, 5, 12, 18, 28% illustratively). UK VAT uses the same two directions at 20%, 5%, or 0%. The difference is how the tax line is labelled, not the algebra.
| Mode | You type | You get |
|---|---|---|
| GST/VAT exclusive | Net 10,000 at 18% | Tax 1,800; gross 11,800 |
| GST/VAT inclusive | Gross 11,800 at 18% | Net 10,000; tax 1,800 |
| UK VAT exclusive | Net £100 at 20% | VAT £20; gross £120 |
| UK VAT inclusive | Gross £120 at 20% | Net £100; VAT £20 |
CGST, SGST, IGST
Intra-state Indian supplies split GST in half: CGST and SGST (or UTGST). Inter-state is IGST at the full rate. UK VAT does not split that way. Do not put CGST on a UK invoice.
Rounding
This site rounds each money line to two decimals and, for intra-state GST, assigns the leftover paisa so CGST + SGST equals total GST. Your accounting package may round the invoice differently. That is why this is an estimate, not a filed return.
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GST inclusive vs exclusive (and UK VAT) FAQ
- Which calculator should I use?
- Indian GST invoices: GST calculator (jurisdiction + slabs). UK VAT invoices: UK VAT calculator (single rate). Do not mix them.