When a price tag shows GST inclusive amount (e.g. ₹1,180), you need to split base value and tax for accounting or margin calculation. A reverse GST calculator does this instantly.
Formula
Base = Inclusive Amount ÷ (1 + GST Rate/100)
Example: ₹1,180 inclusive at 18% → Base = 1180/1.18 = ₹1,000, GST = ₹180.
When you need reverse GST
- Supplier quotes final price including tax
- Reconciling restaurant or retail bills
- Preparing purchase entries in books
Use Master Calc Reverse GST Calculator or GST Calculator in Remove mode. For billing, try Generate Invoice.
Disclaimer: Verify rates for your product category.