GST Calculator
Add or remove GST at the current rates, and split the tax into CGST and SGST or IGST depending on the type of supply.
Researched by Mirza Seraj BaigFacts last checked against official sources on 7 September 2026The invoice value you are working from.
Two main slabs apply since 22 September 2025. The old 12% and 28% rates no longer exist.
Interstate supply attracts IGST; supply within a state splits equally into CGST and SGST.
Total invoice value
₹11,800
≈ 11.80 thousand
- Taxable value
- ₹10,000
- CGST @ 9%
- ₹900
- SGST @ 9%
- ₹900
- Total GST
- ₹1,800
How this is calculated
To add GST: tax = amount × rate, and total = amount + tax. To remove GST from a tax-inclusive amount: taxable value = amount ÷ (1 + rate), and tax = amount − taxable value. For supply within a state the tax splits equally into CGST and SGST; for supply between states the whole amount is IGST.
Frequently asked questions
What are the current GST rates in India?
Following the 56th GST Council meeting, the structure was simplified to two main rates — 5% (merit rate) and 18% (standard rate) — plus a 40% special rate on sin and luxury goods such as pan masala, tobacco, aerated drinks and high-end vehicles. The revised rates took effect on 22 September 2025.
Do the 12% and 28% GST slabs still exist?
No. The 12% and 28% slabs were removed when the two-rate structure came into effect on 22 September 2025. Items previously in those slabs were moved to 5%, 18% or the 40% special rate.
What is the difference between CGST, SGST and IGST?
For a supply within the same state, GST is split equally between Central GST and State GST. For a supply between states, the whole amount is charged as Integrated GST instead. The total tax is the same either way.
How do I remove GST from a total amount?
Divide the total by (1 + rate). For example, at 18% divide by 1.18 to get the taxable value; the difference is the GST. Select the GST-inclusive option in the calculator to do this automatically.