How Does the GST Calculator Work?
The Goods and Services Tax (GST) is a destination-based comprehensive indirect tax levied on the manufacturing, sale, and consumption of goods and services throughout India. Introduced to eliminate cascading tax liabilities ("tax on tax"), GST consolidates central and state levies into a streamlined framework.
Under the GST regime, tax liability is apportioned according to whether the commercial transaction is intra-state (within the same state) or inter-state (across state borders):
- Intra-State Transactions: Tax is split equally between CGST (Central GST) and SGST (State GST). For instance, an 18% slab translates to 9% CGST and 9% SGST.
- Inter-State Transactions: The entire tax is collected as IGST (Integrated GST) by the Central Government.
Formula & Mathematical Methodology
Our calculator supports both calculating GST inclusive and exclusive prices:
1. Adding GST to Base Price (Exclusive):
GST Amount = (Base Amount × GST %) / 100Total Gross Price = Base Amount + GST Amount
2. Removing GST from Gross Price (Inclusive):
Base Net Price = Gross Amount / (1 + [GST % / 100])GST Amount = Gross Amount - Base Net Price
Step-by-Step Practical Calculation Example
Suppose you are billing a professional software service worth ₹50,000 subject to an 18% GST slab:
- Base Price: ₹50,000
- CGST (9%): ₹4,500
- SGST (9%): ₹4,500
- Total GST Amount: ₹9,000
- Final Invoice Value: ₹59,000
Conversely, if an electronics product is sold with an MRP of ₹23,600 (inclusive of 18% GST):
- Net Base Price: ₹23,600 / 1.18 = ₹20,000
- GST Tax Component: ₹23,600 - ₹20,000 = ₹3,600