🇮🇳 Free Tool for GST Professionals & Businesses

Reverse GST Calculator

Extract GST Amount & Original Price Instantly

Enter any GST-inclusive total amount and get the original base price, exact GST amount, and CGST/SGST/IGST breakdown — free, instant, no login.

Find original price from GST-inclusive amount
CGST, SGST & IGST breakdown auto-calculated
Intra-state & Inter-state both supported
All GST slabs — 0%, 5%, 12%, 18%, 28%

🔄 Reverse GST Calculator

Extract GST from total price — free & instant

Total Amount Including GST (₹)

₹

GST Rate (%)

Total (incl. GST) —

GST Amount —

Original Price —

Tax Breakdown

What Is It

What is Reverse GST Calculation?

A reverse GST calculation helps you find the original base price and the exact GST amount from a total price that already includes GST. This is also called GST backward calculation or extracting GST from inclusive price.

For example, if a product is priced at ₹11,800 including 18% GST, the reverse GST calculator will tell you that the original price is ₹10,000 and the GST amount is ₹1,800.

This is widely used by business owners, accountants, CAs, and GST practitioners while preparing GST invoices, filing returns, and reconciling purchase records.

📐 Reverse GST Formula

Original Price = Total ÷ (1 + GST Rate / 100)

GST Amount = Total − Original Price

Example: ₹11,800 ÷ (1 + 18/100) = ₹10,000
GST = ₹11,800 − ₹10,000 = ₹1,800

How To Use

How to Use Reverse GST Calculator

Select Transaction Type Choose Intra-State (same state) for CGST+SGST, or Inter-State for IGST. This affects how the tax is split.

Enter Total Amount Type the total price that includes GST. For example, if the bill shows ₹5,900 with 18% GST, enter 5900.

Select GST Rate Choose the applicable GST slab — 0%, 3%, 5%, 12%, 18%, or 28%. Or enter a custom rate.

Get Instant Result See the original base price, GST amount, and complete CGST/SGST/IGST breakdown instantly.

Who Uses It

Who Needs a Reverse GST Calculator?

🧾

Business Owners

Verify GST amounts on vendor invoices, extract base price for accounting entries, and ensure correct ITC claims.

📊

CA & Tax Consultants

Quickly calculate reverse GST during client audits, GST return filing, and purchase reconciliation work.

🛍️

E-Commerce Sellers

Find original product cost from MRP when GST is already included. Essential for Amazon and Flipkart sellers.

🏦

Finance Teams

Extract tax component from inclusive billing for correct expense booking and GST reconciliation in ERP systems.

🚚

Transporters

Calculate GST on freight charges under reverse charge mechanism (RCM) where recipient pays the tax.

🏪

Retailers & Traders

Find the pre-GST price from MRP to calculate profit margins and set competitive pricing strategies.

Quick Reference

Reverse GST Examples Table

Total (Incl. GST)	GST Rate	GST Amount	Original Price	Common Usage
₹1,050	5%	₹50	₹1,000	Medicines, food items
₹11,200	12%	₹1,200	₹10,000	Mobile phones, computers
₹11,800	18%	₹1,800	₹10,000	IT services, restaurants
₹53,100	18%	₹8,100	₹45,000	Laptop purchase
₹1,28,000	28%	₹28,000	₹1,00,000	Luxury items, cars

FAQ

Frequently Asked Questions

Everything you need to know about reverse GST calculation in India.

Reverse GST calculation is the process of extracting the original base price and GST amount from a total price that already includes GST. The formula is: Original Price = Total ÷ (1 + GST Rate/100). For example, ₹11,800 with 18% GST gives an original price of ₹10,000 and GST of ₹1,800.

CGST (Central GST) and SGST (State GST) are applied on intra-state transactions — both are half of the total GST rate. IGST (Integrated GST) is applied on inter-state transactions at the full rate. For example, 18% GST intra-state = 9% CGST + 9% SGST. Inter-state = 18% IGST.

To reverse calculate 18% GST: divide the total inclusive price by 1.18. For example, ₹11,800 ÷ 1.18 = ₹10,000 (original price). The GST amount is ₹11,800 − ₹10,000 = ₹1,800. CGST = ₹900 (9%) and SGST = ₹900 (9%) for intra-state.

Under Reverse Charge Mechanism (RCM), the recipient of goods or services is liable to pay GST instead of the supplier. The calculation method is the same — but the buyer self-assesses and pays. Common examples include GTA (transport) services, legal services from advocates, and import of services.

Yes, completely free. No registration, no login, no hidden charges. You can use this reverse GST calculator unlimited times for all types of transactions — intra-state and inter-state both supported.

GST rates in India 2026: 0% on essential items (fresh vegetables, milk, books), 3% on gold and precious metals, 5% on household necessities (sugar, tea, medicines), 12% on processed foods and computers, 18% on most goods and services (IT, restaurants, AC), 28% on luxury items (cars, tobacco, aerated drinks).

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