GST Reverse Calculator

A GST Reverse Calculator helps determine the original price of a product or service when the final amount already includes GST. This calculation warns you how much tax has been charged within the total amount.

Reverse GST calculation is commonly used while verifying bills, analysing expenses, auditing invoices, or understanding the actual cost before tax. It is especially useful when prices are displayed as GST-inclusive.

How Reverse GST Calculation Works

When GST is included in the final price, the GST amount is calculated using the formula: GST = Total Amount × (GST Rate / (100 + GST Rate)).

Once the GST amount is calculated, the original taxable value is obtained by subtracting GST from the total amount.

Example of Reverse GST Calculation

Suppose you paid ₹118 for an item that includes 18% GST. The GST amount inside the price is ₹18, and the original taxable value is ₹100.

Using a reverse GST calculator removes manual calculation errors and provides instant and accurate results.

When Should You Use Reverse GST?

Reverse GST calculation is useful when checking invoices, verifying GST charged by sellers, preparing accounts, or understanding tax impact on purchases.

If you need to calculate GST on a base amount instead, use our GST Calculator for direct GST computation.