Reverse GST Calculation Guide
Result
Frequently asked questions
Reverse GST Calculation Guide
What is Reverse GST Calculation?
Reverse GST calculation is the process of finding the original price and GST amount when you only know the total amount (which includes GST). It's called "reverse" because you're working backwards from the final amount.
Universal Reverse GST Formula
Amount without GST = Total Amount ÷ (1 + GST Rate/100)
GST Amount = Total Amount - Amount without GST
Quick Division Factors
5% GST
÷ 1.05
12% GST
÷ 1.12
18% GST
÷ 1.18
28% GST
÷ 1.28
Step-by-Step Reverse Calculation
Example: ₹23,600 total amount with 18% GST
Identify the total amount: ₹23,600
This includes 18% GST
Apply the formula: ₹23,600 ÷ 1.18
1.18 = 1 + (18/100)
Calculate base amount: ₹20,000
This is the price before GST
Find GST amount: ₹23,600 - ₹20,000 = ₹3,600
This is the 18% GST amount
Common Business Scenarios
Invoice Verification
Check if the GST amount on invoices is calculated correctly by working backwards from the total
Price Comparison
Compare actual product/service costs by excluding GST from different suppliers
Expense Tracking
Separate business expenses from tax amounts for accounting and tax filing
Margin Calculation
Calculate profit margins on the actual selling price excluding GST
⚠️ Important Notes
- • Always confirm the GST rate applicable to your item/service
- • Some items may have different GST rates (0%, 5%, 12%, 18%, 28%)
- • Reverse calculation helps in price negotiations and cost analysis
- • Use this method to verify GST calculations on bills and invoices
Other tools
Income Tax Calculator
Calculate your tax liability
Inflation Calculator
Calculate inflation impact
Reverse Inflation Calculator
Calculate past value
SIP Calculator
Plan monthly investments
CAGR Calculator
Calculate growth rate
Lumpsum Calculator
One-time investment returns
EMI Calculator
Calculate loan EMIs
SWP Calculator
Plan systematic withdrawals
Retirement Calculator
Plan your retirement
Disclaimer
I am a Software Professional; not a Chartered Accountant.
This tax calculator has been created with the information available to me. I do not claim this to be 100% accurate.
This tax calculator can be used for tax planning to calculate the approximate tax payable by salaried individuals. This should NOT be used to compute the actual taxes to be paid to the Government. I am not resposible for any inaccuracies in the tax computed by this calculator.
If you find any inaccuracy or error, please let me know at the feedback form and I will try to fix it at the earliest.