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Reverse GST Calculator

Work backwards from a tax-inclusive price to the taxable value.

Working backwards from a tax-inclusive price
Taxable value (before GST)
GST included
CGST + SGST (if intra-state)
each
Total paid

When do you need reverse GST?

Retail prices in India are usually quoted inclusive of GST. To record the sale correctly you need the taxable value — the amount before tax — because that is what goes in your books and your GSTR-1.

The formula is: taxable value = total ÷ (1 + rate ÷ 100).

BikriBook does this automatically

Start free

Run your business from your phone

Install the BikriBook app on your phone — bill even without internet, send invoices on WhatsApp and get payment reminders. No app store needed.

30-second billing

Save a GST bill before the customer leaves the counter.

Works offline

No signal? Bills queue on the phone and sync later.

Payment reminders

Get notified about overdue bills and send a WhatsApp nudge.