📐 Reverse GST Calculator Formula
Base Price = Total Amount / (1 + (GST Rate / 100)) | GST Amount = Total Amount - Base Price
- Total Amount: The final invoice amount including GST
- GST Rate: The applicable tax slab (e.g. 5, 12, 18, 28)
Reverse GST Calculator: Extract Tax from Total Price
A Reverse GST Calculator is essential when you know the final MRP or Bill Amount and need to figure out the original base price of the product before GST was applied. Simply enter the final price and the applicable GST percentage to get the exact breakdown of Base Value, CGST, and SGST.
Input Parameters
₹
%
Results
Base Price (Excl. GST)₹1,000
Total GST Amount₹180
CGST₹90
SGST₹90
Visual Breakdown
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📝 Example
If a laptop is billed at ₹59,000 (inclusive of 18% GST). Base Price = 59,000 / (1 + 0.18) = ₹50,000. Total GST = ₹9,000 (which is split into ₹4,500 CGST and ₹4,500 SGST).
✅ Benefits
- •Instantly find the net value of an item from its MRP.
- •Crucial for businesses filing Input Tax Credit (ITC) returns.
- •Prevents manual calculation errors when reverse-calculating percentages.
❓ Frequently Asked Questions
What is Reverse GST calculation?
Reverse GST calculation is the process of extracting the original base price of a good or service when you only know the final price (which already includes the tax). You cannot simply subtract the tax percentage from the final price because the tax was originally calculated on the base price, not the final price.
How do I split GST into CGST and SGST?
For intra-state transactions (within the same state), the total GST amount is divided equally into two halves: Central GST (CGST) and State GST (SGST). For example, an 18% GST is 9% CGST and 9% SGST.
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