Find the original price before GST was added
The total price you paid (including GST)
Example:
If you paid ₹1,180 (including 18% GST), this calculator will show you that the original price was ₹1,000 and the GST amount was ₹180.
How it works
Original Amount = Final Amount × 100 / (100 + GST Rate)
GST Breakdown:
Out of ₹0.00, the original price was ₹0.00 and ₹0.00 (18%) was GST.
When you have the final invoice amount and need to know the base price and GST separately
For bookkeeping when you need to separate the taxable amount from GST
Compare actual product prices when different sellers show prices with GST included
Understanding how much tax you're paying on purchases
Goods and Services Tax (GST) is a crucial part of almost every financial transaction in India. Whether you are purchasing a product, receiving an invoice, managing business accounts, or working as a freelancer, GST is always included in the final amount. However, many times the price you see already includes GST, and you may want to know the actual base price before tax was added.
A Reverse GST Calculator helps you find the original amount before GST was applied. Instead of adding tax, it works backward — separating the GST portion from the total amount. This is especially helpful for invoice analysis, accounting, and understanding the exact tax you are paying.
GST was introduced on 1 July 2017 to replace multiple indirect taxes such as VAT, Service Tax, and Excise Duty. It created a unified taxation system across the country.
Reverse GST calculation means finding the original price when the final amount already includes GST. This helps you understand how much of the total is actual cost and how much is tax.
Base Amount = Total Amount × 100 ÷ (100 + GST Rate)If you paid ₹1,180 including 18% GST, the original price is ₹1,000 and GST is ₹180. This shows how the total amount is split between actual cost and tax.
For intra-state transactions, GST is divided into CGST and SGST equally. For inter-state transactions, GST is charged as IGST.
Reverse charge in GST is a mechanism where the recipient of goods or services pays the tax instead of the supplier.
The reverse charge mechanism requires the recipient to pay GST directly to the government instead of the supplier, applicable for certain goods and services.
To calculate reverse GST, multiply the base amount by the applicable GST rate. The recipient pays this amount directly to the government.
Reverse calculating GST means finding the base amount before GST. Use: Base Amount = Total Amount × 100 ÷ (100 + GST Rate).
To reverse GST, divide the total amount including GST by (1 + GST rate/100) to get the original amount before GST.
Reverse percentage GST is calculated as: GST Amount = Total Amount × GST Rate ÷ (100 + GST Rate).
GST reverse charge is a process where the buyer pays the tax directly instead of the seller, for specific notified goods and services.
The formula to reverse GST is: Base Amount = Total Amount × 100 ÷ (100 + GST Rate), and GST Amount = Total Amount - Base Amount.
Reverse tax amount can be calculated as: GST Amount = Total Amount - (Total Amount × 100 ÷ (100 + GST Rate)).
Reverse charge transactions must be reported under the reverse charge section in GST returns, showing both taxable value and GST paid by recipient.
GST में रिवर्स चार्ज का मतलब है कि टैक्स की जिम्मेदारी विक्रेता के बजाय प्राप्तकर्ता पर होती है।
Disclaimer: GST rates and rules may change. Always verify with official sources or a tax professional.