GST Calculator
Add GST to a price or extract it from a GST-inclusive amount, with the CGST/SGST split for intra-state supply or IGST for inter-state supply.
Your numbers
₹ INR- CGST
- ₹900
- SGST / UTGST
- ₹900
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The formula, in plain English
- Exclusive: GST = Amount × Rate; Total = Amount + GST
- Inclusive: Base = Amount ÷ (1 + Rate); GST = Amount − Base
- Intra-state: CGST = SGST = GST ÷ 2 · Inter-state: IGST = GST
Frequently asked questions
What GST rate applies to software and SaaS in India?
Most IT and software services, including SaaS, are taxed at 18% GST. Exports of services can be zero-rated under a Letter of Undertaking.
When do I charge IGST instead of CGST + SGST?
IGST applies to inter-state supplies (seller and buyer's place of supply in different states) and imports. Intra-state supplies split the tax equally into CGST and SGST/UTGST.
When must a startup register for GST?
Service providers must register once aggregate turnover crosses ₹20 lakh (₹10 lakh in special-category states); some cases, such as inter-state supply of goods or e-commerce sellers, require registration regardless.
Results are estimates for planning and education — not financial, legal or tax advice.