Reverse GST Calculator
Calculate the original price and GST amount from a GST-inclusive price. Fast, free and easy to use.
📊 GST Calculation Results
Results update automatically when you change the inputs.
What Is Reverse GST Calculation?
Reverse GST calculation is used to find the original taxable value and GST amount when the total price already includes GST. It is useful for checking bills, understanding product prices and preparing basic invoice calculations.
Reverse GST Formula
GST Amount = Total Amount − Taxable Value
Example: Price Including 18% GST
Suppose the final price is ₹11,800 and the applicable GST rate is 18%.
- Original taxable value: ₹11,800 × 100 ÷ 118 = ₹10,000
- Total GST: ₹11,800 − ₹10,000 = ₹1,800
- For an eligible intra-state supply: CGST ₹900 + SGST ₹900
- For an inter-state supply: IGST ₹1,800
How to Use This Reverse GST Calculator
- Enter the final amount that already includes GST.
- Select the applicable GST rate.
- Choose the type of supply.
- View the taxable value and GST breakdown instantly.
- Use Copy Results to copy the calculation.
Frequently Asked Questions
1. How do I remove GST from a price?
Divide the GST-inclusive amount by 1 plus the GST rate expressed as a decimal. For example, at 18% GST, divide the amount by 1.18.
2. What is the difference between GST and reverse GST?
In a regular GST calculation, tax is added to the taxable value. In reverse calculation, the tax component is separated from a price that already includes GST.
3. What is the difference between CGST, SGST and IGST?
For a typical taxable intra-state supply, GST is divided between CGST and SGST or UTGST, as applicable. For an inter-state supply, IGST generally applies. The actual treatment depends on the applicable GST rules and transaction.
4. Is this calculator free?
Yes. You can use this calculator without creating an account. Calculations are performed in your browser by this tool.