GST
How GST is calculated
To add GST, multiply the base amount by the applicable rate. To remove GST from an inclusive amount, divide by one plus the rate.
Adding GST
For a ₹10,000 base amount at 18%, GST is ₹1,800 and the inclusive total is ₹11,800.
Removing GST
For an inclusive ₹11,800 amount at 18%, the pre-tax value is ₹11,800 ÷ 1.18 = ₹10,000. Subtract that base from the inclusive amount to get GST.
Rate and split
The calculator does not determine classification or rate. For an intra-State supply, GST is commonly split into CGST and SGST; for an inter-State supply, IGST may apply. Verify treatment for the actual transaction.
How to check a GST amount
For an exclusive amount, multiply the base by the selected rate. For an inclusive amount, divide by one plus the rate. At 18%, ₹10,000 becomes ₹11,800; ₹11,800 ÷ 1.18 returns a ₹10,000 base and ₹1,800 GST. This verifies arithmetic only, not the applicable rate or tax treatment.
This guide is for general education. Rules, lender terms, bank terms and individual circumstances can change the result.
Use the relevant calculatorFrequently asked questions
Does the calculator determine the correct GST rate?
No. It only applies the rate selected. Classification and transaction facts determine the applicable treatment.
How do I remove GST from an inclusive price?
Divide the inclusive amount by one plus the rate, then subtract the base amount to find the GST component.