Question 1

What is a GST calculator?

Accepted Answer

A GST calculator computes the GST component of a transaction, the taxable value, and the final invoice total. It also splits the GST into CGST, SGST, and IGST based on whether the supply is intra-state or inter-state.

Question 2

How do I add GST to an amount?

Accepted Answer

Select Add GST, enter the base amount and the applicable GST rate. GST Amount = Base Amount × Rate / 100, and the invoice total is the base amount plus the GST amount.

Question 3

How do I remove GST from a GST-inclusive amount?

Accepted Answer

Select Remove GST, enter the GST-inclusive amount and the applicable rate. Taxable Value = Inclusive Amount × 100 / (100 + Rate). The GST amount is the difference between the inclusive amount and the taxable value.

Question 4

What is the difference between CGST, SGST and IGST?

Accepted Answer

CGST and SGST are the two halves of GST collected on intra-state supplies — they go to the central and state governments respectively. IGST is the integrated tax collected on inter-state supplies and is later apportioned between the centre and the destination state.

Question 5

When is IGST applicable?

Accepted Answer

IGST applies whenever the supplier and the recipient are in different states (or Union Territories), including imports. If both are in the same state, the supply is intra-state and CGST + SGST are charged instead.

Question 6

Can GST rates change?

Accepted Answer

Yes. GST rates are revised by the GST Council from time to time. This calculator uses supply-date-aware rate validation — if you pick a supply date for which the selected rate was not in force, the calculator warns you.

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