How to use the GST calculator
- Choose Add GST if your amount excludes tax (e.g. a quoted price), or Remove GST if it already includes tax (e.g. an MRP or a bill total).
- Enter the amount and pick a GST rate, or type a custom rate.
- Choose whether the supply is within your state (split into CGST and SGST) or inter-state (IGST). The breakdown updates instantly.
GST formulas
Adding GST to a net price
Removing GST from an inclusive price
Worked example
A Pune-based agency bills a Mumbai client ₹50,000 for services at 18% GST. Both are in Maharashtra, so it's an intra-state supply: GST is ₹9,000, split into CGST ₹4,500 and SGST ₹4,500, for an invoice total of ₹59,000. If the client were in Bengaluru, the agency would charge IGST ₹9,000 instead.
Current GST rate structure
| Rate | Typical goods and services |
|---|---|
| 0% | Fresh fruit and vegetables, milk, unbranded cereals, education and healthcare services |
| 0.25% / 3% | Rough diamonds and precious stones / gold, silver and jewellery |
| 5% | Packaged food staples, many daily-use items, restaurant services, economy transport |
| 18% | Most goods and services — IT and professional services, electronics, many manufactured goods |
| 40% | Sin and luxury goods — tobacco products, aerated drinks, large cars |
The 12% and 28% slabs were largely merged into 5% and 18% in the September 2025 rate rationalisation. Rates depend on the exact HSN (goods) or SAC (services) code, so always confirm against the latest CBIC notification before invoicing.
Who needs to register for GST?
Businesses supplying goods with aggregate turnover above ₹40 lakh (₹20 lakh in special category states), and service providers above ₹20 lakh (₹10 lakh in special category states), must register. Inter-state suppliers of goods and e-commerce sellers generally need to register regardless of turnover.
Working out your selling price? Try the profit margin calculator.
Frequently asked questions
How do I calculate GST on an amount?
Multiply the net price by the GST rate. For ₹10,000 at 18%, GST = 10,000 × 18 / 100 = ₹1,800, and the total price is ₹11,800.
How do I remove GST from an inclusive price?
Divide the inclusive price by (1 + rate/100). For ₹11,800 including 18% GST, the base price is 11,800 ÷ 1.18 = ₹10,000, and the GST portion is ₹1,800.
When is CGST + SGST charged instead of IGST?
CGST and SGST (each half the rate) apply to intra-state supplies — when the supplier and the place of supply are in the same state. IGST at the full rate applies to inter-state supplies and imports.
What are the current GST slabs?
After the GST rate rationalisation effective 22 September 2025, the main slabs are 5% and 18%, with 40% for sin and luxury goods, plus special rates of 0%, 0.25% and 3% for specific items. Check the CBIC rate notifications for your product's HSN or SAC code.
Last updated: 22 September 2026Suggest an improvement · Report a problem