Why is a reverse GST calculator essential?

A reverse GST calculator is a vital tool when you have the final, GST-inclusive price and need to determine the original cost (the pre-GST price) and the tax amount. This is crucial for accurate accounting and preparing tax-compliant invoices.

How does this calculator help small business owners?

It helps in verifying invoices from suppliers and is indispensable when creating B2B invoices, where showing the base amount and GST separately is mandatory for claiming Input Tax Credit (ITC).

What's the difference between a forward and a reverse GST calculator?

A forward GST calculator adds tax to a base price. A reverse GST calculator does the opposite, taking a final price and extracting the original base price and the tax amount.

Can I use this for any GST rate in India?

Yes. Our reverse GST calculator is pre-configured with all the standard GST slabs in India: 3%, 5%, 12%, 18%, and 28%. Furthermore, we have included a 'Custom' rate option for any special cases.

Reverse GST Calculator

Enter the total amount including GST to find out the original price and the tax amount.

Calculate from Final Price

How Our Reverse GST Calculator Works

1. Enter the Final Price

Start by inputting the total price you paid or see on a bill. This is the gross amount that already includes the GST component. Our reverse GST calculator is designed to handle this perfectly.

2. Select the GST Rate

Choose the correct GST slab (e.g., 5%, 12%, 18%, 28%) that applies to the product or service. The calculator uses this rate to work backwards and find the pre-GST price.

The Formula Explained

Understanding the math behind the reverse GST calculator is simple. It isolates the base value from the total price using a standard formula, which is crucial for anyone needing to calculate the pre-GST price.

Base Amount = Total Amount / (1 + (GST Rate / 100))

This formula is the core of our reverse GST calculator, ensuring accuracy every time.

Practical Scenarios

Example: Electronics Purchase

You bought a smartphone for ₹23,600, which includes 18% GST. Using the reverse GST calculator, you'd find the pre-GST price is ₹20,000 and the GST amount is ₹3,600. This is a common use case for our tool.

Example: Restaurant Bill

Your dinner bill is ₹1,050, inclusive of 5% GST. The reverse GST calculator will show you that the cost of food was ₹1,000 and you paid ₹50 in GST. Essential for expense tracking and understanding the pre-GST price.

Frequently Asked Questions

Explore More Tools

Our suite of tools is designed to simplify every aspect of GST for you. Check out our primary GST calculator for forward calculations.

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