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Goods & Services Tax Engine

GST Calculator – Calculate Inclusive & Exclusive GST

Quickly calculate exact GST amounts, net base price, gross invoice total, and CGST / SGST / IGST tax splits across all Indian GST rate slabs (5%, 12%, 18%, 28%).

₹0
Total Invoice
Net Base Price
₹10,000
Total GST Tax
₹1,800
Intra-State: CGST (50%) = ₹900 SGST (50%) = ₹900
Inter-State: IGST (100%) ₹1,800
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Understanding Goods and Services Tax (GST) in India

The Goods and Services Tax (GST) is a comprehensive, multi-stage, destination-based indirect tax levied on the supply of goods and services across India. Implemented on July 1, 2017, GST replaced a convoluted web of cascading central and state indirect taxes—including Central Excise Duty, Service Tax, State VAT, Luxury Tax, and Entry Tax—under the constitutional framework of "One Nation, One Tax".

Mathematical Formulas for GST Calculation

1. GST Exclusive Formula (Adding GST to Base Price)
\text{GST Amount} = \frac{\text{Base Price} \times \text{GST Rate \%}}{100}
\text{Total Invoice Amount} = \text{Base Price} + \text{GST Amount}
2. GST Inclusive Formula (Extracting GST from Gross Total)
\text{Net Base Price} = \frac{\text{Gross Total Amount} \times 100}{100 + \text{GST Rate \%}}
\text{GST Amount} = \text{Gross Total Amount} - \text{Net Base Price}

Frequently Asked Questions (FAQs)

What is Input Tax Credit (ITC) in GST?
Input Tax Credit (ITC) allows registered businesses to claim credit for the GST paid on purchases of goods and services used in the course of business, offsetting it against the GST liability payable on outward sales, thereby preventing double taxation.
How is GST applied on stock trading brokerage?
In Indian stock trading, GST is levied at 18% on the sum of Brokerage charges, Exchange Transaction charges, and SEBI regulatory fees. STT and Stamp Duty are exempt from GST.
What is the difference between Nil-Rated, Exempt, and Zero-Rated GST supplies?
  • Nil-Rated: Goods with a 0% GST rate (e.g. fresh milk, unprocessed grains).
  • Exempt: Goods and services specifically exempted by government notification (no ITC available).
  • Zero-Rated: Exports of goods/services and supplies made to Special Economic Zones (SEZs), where full ITC can be refunded.
Who is required to register for GST in India?
Any business whose aggregate annual turnover exceeds ₹40 Lakh for goods (₹20 Lakh for special category states) or ₹20 Lakh for services (₹10 Lakh for special category states) must register for GST. E-commerce sellers and interstate suppliers must register regardless of turnover.
What is Reverse Charge Mechanism (RCM)?
Under the Reverse Charge Mechanism, the liability to pay GST to the government is shifted from the supplier to the recipient of the goods or services (common when purchasing from unregistered suppliers or specific legal/transport services).
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