Can this tool replace professional tax advice?

No. The tool is an educational calculation aid. Users should verify figures, legal classification, rates and due dates with a qualified professional before making decisions.

Does the tool store my calculation?

Standard tool calculations are processed in the browser request and can be shared using the generated URL. Avoid entering confidential case information on public pages.

Reverse GST Calculator | Extract GST from Inclusive Amount

Purpose

The reverse GST calculator extracts taxable value and tax from an amount that already includes GST.

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

Example

If the invoice total is ₹11,800 and the GST rate is 18%, the taxable value is ₹10,000 and GST is ₹1,800.

Limitations

This tool assumes one GST rate. Mixed supplies, discounts, credit notes, cess, rounding and exempt components require detailed invoice review.

Frequently asked questions

Does reverse GST work for multiple tax rates?

No. Split the invoice by rate and calculate separately.

Can it separate CGST and SGST?

After extracting GST, divide equally for intra-state supplies unless law requires a different treatment.