GST Calculator India (GST 2.0: 5%, 18% and 40%)
To add GST, multiply the taxable value by the rate: ₹10,000 at 18% is ₹1,800 GST, ₹11,800 in total. Within a state that is 9% CGST plus 9% SGST; between states it is 18% IGST. To remove GST, divide the inclusive price by 1.18. Since 22 September 2025 the main rates are 5%, 18% and 40%.
Choose whether to add GST to a price or take it out of a GST-inclusive one, pick the rate and the type of supply, and get the taxable value, CGST and SGST or IGST, and the total for your tax invoice.
GST formula
GST = taxable value × rate ÷ 100; total = taxable value + GST. Within a state: CGST = SGST = GST ÷ 2. Reverse GST: taxable value = inclusive price ÷ (1 + rate ÷ 100); GST = inclusive price − taxable value.
Worked example
| Case | Amount |
|---|---|
| Taxable value | ₹10,000.00 |
| CGST 9% | ₹900.00 |
| SGST 9% | ₹900.00 |
| Total including GST (18%) | ₹11,800.00 |
| Same sale to another state: IGST 18% | ₹1,800.00 |
| ₹5,250.00 including 5% GST: taxable value + GST | ₹5,000.00 + ₹250.00 |
Frequently asked questions
What are the GST rates in India now?
Since 22 September 2025 (GST 2.0) most goods and services are taxed at 5%, the merit rate, or 18%, the standard rate, with a special 40% rate for luxury and sin goods. The 12% and 28% slabs were removed. Gold, silver and jewellery stay at 3%, and many essentials are nil-rated.
How do I calculate CGST and SGST?
For a sale within one state, split the GST rate in half: 18% GST is 9% CGST for the Centre and 9% SGST for the state (UTGST in a union territory). On a taxable value of ₹10,000 that is ₹900 CGST plus ₹900 SGST.
When is IGST charged instead?
IGST is charged on inter-state supplies, imports and supplies to SEZs: the whole rate goes on the invoice as IGST. Goods worth ₹10,000 sold from Maharashtra to a buyer in Karnataka at 18% carry ₹1,800 IGST.
How do I remove GST from a price (reverse GST)?
Divide the GST-inclusive price by 1 plus the rate: ₹11,800 ÷ 1.18 = ₹10,000 taxable value, so the GST is ₹1,800. At 5%, divide by 1.05: ₹5,250 includes ₹250 GST.
Who has to register for GST?
Most businesses must register once their aggregate turnover crosses ₹40 lakh a year for goods or ₹20 lakh for services; lower limits apply in some north-eastern and hill states. Inter-state suppliers of goods and most e-commerce sellers must register whatever their turnover.
Is the old 12% or 28% rate still used?
Not for most items since 22 September 2025: they moved to 5%, 18% or 40%. If a notification gives a different rate for your HSN or SAC code, choose Custom rate and enter it; the rate notifications are on the CBIC GST portal.
Related tools: GST calculator Australia, profit margin calculator, markup calculator. More on sales and running a sales team on the SalesBond blog and the home page.
Official sources
- Press Information Bureau: recommendations of the 56th GST Council — standard 18%, merit 5% and special 40% rates from 22 September 2025.
- CBIC GST portal — CGST and IGST Acts and rate notifications by HSN/SAC code.
- GST portal (GSTN) — registration and returns.
Updated on Nov 5, 2026. This calculator is for information only and is not tax, legal or payroll advice. Results follow the formulas above; check the rate for your HSN or SAC code in the CBIC notifications or with a GST practitioner.
