Reverse GST Calculator

Use this when you only know the final amount a customer paid, or the MRP printed on a product, and need the pre-tax value for your books or invoice.

Quick answer

Taxable value = inclusive price ÷ (1 + GST rate/100). GST amount = inclusive price − taxable value. At 18%, a ₹590 bill has a taxable value of ₹500 and GST of ₹90.

How to use the Reverse GST Calculator

Enter the GST-inclusive amount.
Choose the GST rate.
Read the taxable value, GST and CGST/SGST split.

Worked example

A restaurant bill of ₹1,050 at 5%: taxable value = 1,050 ÷ 1.05 = ₹1,000; GST ₹50 (CGST ₹25 + SGST ₹25).

Formula

Taxable value = Inclusive ÷ (1 + Rate ÷ 100)
GST = Inclusive − Taxable value

Frequently asked questions

Why not just subtract 18% from the total?

Because the 18% was charged on the base price, not on the total. Subtracting 18% of ₹1,180 gives ₹967.60, which is wrong; dividing by 1.18 gives the correct ₹1,000.

Is MRP inclusive of GST?

Yes. In India, MRP printed on packaged goods includes all taxes.

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