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INDIA TAX TOOL

GST Calculator

Calculate GST-inclusive and GST-exclusive prices, GST amount, CGST, SGST and IGST quickly.

The 40% option is included because it is now available in the IRP tax-rate master.
Enter an amount and GST rate.
GST amount—
CGST + SGST—
Total including GST—
Enter the GST-inclusive amount and rate.
GST included—
CGST + SGST—
Amount before GST—

CGST, SGST and IGST

For an intra-state taxable supply, GST can be represented as CGST + SGST/UTGST. For an inter-state taxable supply, IGST is used. Official e-invoicing validation rules treat CGST and SGST/UTGST as half of the applicable combined rate, while IGST uses the full applicable rate.

GST on exclusive amount = Taxable Amount × GST Rate ÷ 100

GST-inclusive amount = Taxable Amount + GST

Taxable amount from inclusive price = Inclusive Amount ÷ (1 + GST Rate ÷ 100)

Example

If the taxable amount is ₹10,000 and the GST rate is 18%:

GST = ₹10,000 × 18% = ₹1,800

For an intra-state supply, CGST = ₹900 and SGST = ₹900. The total amount including GST is ₹11,800.

GUIDE

How to calculate GST

To add GST to a price, multiply the taxable amount by the GST rate and divide by 100. Add the resulting GST to the taxable amount.

How to calculate GST from an inclusive price

If a displayed price already includes GST, divide the inclusive amount by 1 + GST rate ÷ 100 to find the taxable value. The difference between the inclusive amount and taxable value is the GST component.

CGST and SGST calculation

For an intra-state supply where CGST and SGST/UTGST apply equally, an 18% combined GST rate is split into 9% CGST and 9% SGST/UTGST. Official GST e-invoice documentation describes CGST and SGST/UTGST as the two components when IGST is not reported.

IGST calculation

For an inter-state taxable supply, the applicable GST rate is reported as IGST. For example, at an 18% rate, IGST is 18% of the taxable value. citeturn0search7

Frequently Asked Questions

How do I calculate 18% GST on ₹10,000?

18% of ₹10,000 is ₹1,800. The GST-inclusive amount is ₹11,800.

How do I remove GST from an inclusive price?

Divide the GST-inclusive price by 1 plus the GST rate divided by 100. For example, ₹11,800 at 18% gives a taxable value of ₹10,000.

What is the difference between CGST, SGST and IGST?

CGST and SGST/UTGST are used together for applicable intra-state supplies, while IGST is used for applicable inter-state supplies. The exact tax treatment depends on the nature and place of supply.

Does this calculator replace professional tax advice?

No. It is a calculation tool. GST classification, place of supply, exemptions, cess and other rules can affect the actual tax liability or invoice.