Sales Tax, VAT & GST Calculator
Quickly compute sales tax, value-added tax (VAT), and Goods and Services Tax (GST) for commercial billing, retail invoicing, or reverse MRP tax extraction.
How it works
In Exclusive mode, the calculator adds GST/VAT onto your net price. In Inclusive mode (Reverse GST), it extracts the embedded tax component from an MRP bill to show the merchant's net revenue.
Formula
Exclusive: T = P × (r / 100), Total = P + T , | , Inclusive: P_net = (Gross / 1 + r/100), T = Gross - P_net
Calculates forward sales tax by multiplying base price by tax rate, or extracts embedded GST by dividing gross price by (1 + tax rate / 100).
| Symbol | Variable | Unit | Description |
|---|---|---|---|
| P | Pre-tax net price | ₹ | |
| r | Applicable GST / Tax rate percentage | % | |
| T | Total tax portion | ₹ |
Worked example
₹1,000 product with 18% GST (Tax Exclusive)
- Price:
- ₹1,000
- GST:
- 18%
- Mode:
- Exclusive
Tax Amount = 18% of ₹1,000 = ₹180. Final Invoice Total = ₹1,180 (CGST ₹90 + SGST ₹90).
₹1,180 MRP item with 18% GST (Tax Inclusive Reverse GST)
- Price:
- ₹1,180
- GST:
- 18%
- Mode:
- Inclusive
Net Pre-tax Price = ₹1,180 / 1.18 = ₹1,000. Embedded GST Amount = ₹1,180 - ₹1,000 = ₹180.
Limitations
Does not model special compensation cess (e.g. tobacco or luxury vehicles).
Frequently asked questions
What are the standard GST slabs in India?
India has four primary GST slabs: 5% (essential goods), 12% (processed foods/electronics), 18% (most consumer goods & services), and 28% (automobiles, luxury goods, air conditioners).
How is GST split between CGST and SGST on intrastate sales?
For transactions within the same state, GST is split equally: an 18% GST item has 9% CGST (Central Government) and 9% SGST (State Government). For interstate sales, the full 18% goes to IGST.
How do I extract GST from an inclusive retail price?
Divide the total inclusive price by (1 + GST rate / 100). For example, with an 18% GST rate, divide the total price by 1.18.
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Last reviewed: 2026-08-22.