↩ Reverse Mode
Reverse GST Calculator Online
Use this free and easy GST calculator online to remove tax from a total amount and find the original pre-tax value. Perfect for reconciling lump-sum payments with our reverse GST calculator.
↩ Reverse GST Mode
Amount (₹)
GST Rate
Transaction Type
Enter an amount above to see the GST breakdown.
Reverse GST Calculator Formula
The mathematical gst calculator formula to work backwards from a GST-inclusive total is:
Taxable Value = Total Amount × 100 ÷ (100 + GST Rate)
GST Amount = Total Amount − Taxable Value
Worked Example — Freelancer Received ₹11,800
A freelancer received ₹11,800 from a client. The payment includes 18% GST. What is the taxable income and how much GST must be remitted?
1
Amount received from client (includes GST) ₹11,800
2
GST rate 18%
3
Taxable Value = 11800 × 100 ÷ (100 + 18) ₹10,000
4
GST Amount = 11800 − 10000 ₹1,800
5
CGST to pay (9%) ₹900
6
SGST to pay (9%) ₹900
Frequently Asked Questions
What is a reverse GST calculation?
A reverse GST calculation means working backwards from a GST-inclusive price to find the original taxable value and the GST component. For example, if you received ₹11,800 from a client inclusive of 18% GST, the reverse calculation tells you the taxable amount is ₹10,000 and the GST is ₹1,800.
What is the formula to remove GST from a price?
Taxable Value = Total Amount × 100 ÷ (100 + GST Rate). GST Amount = Total Amount − Taxable Value.
Why would I need to reverse GST?
Common use cases: (1) You received a lump-sum payment that includes GST and need to report the taxable portion. (2) A vendor quoted a GST-inclusive price and you need the base value for accounting. (3) You want to verify your GST liability from the total collected.
Is reverse GST the same as inclusive GST calculation?
Yes — the math is identical. "Reverse GST" describes the intent (removing GST from a total), while "inclusive GST" describes the price format. Both use the formula: Taxable Value = Amount × 100 ÷ (100 + Rate).
Can I use this to calculate GST on MRP?
Yes. If a product has an MRP that includes GST, enter the MRP and select the applicable GST rate to find the taxable value and GST amount.
Last updated: June 2025