Financial Calculator

Reverse GST Calculator

Quickly reverse-engineer any GST-inclusive price into its original Net Taxable Value, CGST, SGST, and IGST breakdown.

1. Enter Inclusive Details

₹

Calculated Breakdown

Original Taxable Value: ₹ 1,000.00
CGST (9%): ₹ 90.00
SGST (9%): ₹ 90.00
Total GST Extracted: ₹ 180.00
Gross Bill Total: ₹ 1,180.00

The Reverse GST Mathematical Formula

Base Taxable Value = [Total Gross Amount] / (1 + (GST Rate / 100))

Total GST Amount = Total Gross Amount - Base Taxable Value

Example: Extracting GST from ₹1,180 at 18%

If you charged a retail customer ₹1,180 including 18% GST:

  1. Base Price = 1,180 / 1.18 = ₹1,000.00
  2. Total GST = 1,180 - 1,000 = ₹180.00
  3. Intra-state breakdown: CGST (9%) = ₹90.00 and SGST (9%) = ₹90.00