GST Tax Calculator
Add or remove GST at 5%, 12%, 18%, or 28% in seconds. Get CGST + SGST split for intra-state supplies or full IGST for inter-state. Perfect for invoices, billing, and MSME accounting.
Calculate GST
What Is GST?
Goods and Services Tax (GST) is India's unified indirect tax that replaced VAT, service tax, excise duty, and a dozen other central and state levies from 1 July 2017. GST is a destination-based, multi-stage tax with seamless input tax credit (ITC) — businesses pay tax only on the value they add.
GST is split into three components depending on the type of supply:
- CGST — Central GST, collected by the Centre on intra-state supplies.
- SGST/UTGST — State/UT GST, collected by the state on intra-state supplies.
- IGST — Integrated GST, collected by the Centre on inter-state supplies and imports.
How Is GST Calculated?
Add GST (base amount given):
- GST Amount = Base × (Rate / 100)
- Total = Base + GST
Remove/Extract GST (inclusive amount given):
- Base = Inclusive Amount / (1 + Rate / 100)
- GST = Inclusive Amount − Base
Example: Adding 18% GST on ₹10,000 base = ₹1,800 GST → ₹11,800 total. For intra-state, CGST is ₹900 and SGST is ₹900. For inter-state, the full ₹1,800 is collected as IGST.
GST Rate Slabs in India (FY 2025-26)
| Rate | Typical Goods & Services |
|---|---|
| 0% | Fresh milk, fruit, vegetables, books, education, healthcare |
| 5% | Packaged food, edible oil, rail tickets, economy air travel, household necessities |
| 12% | Processed food, mobile phones, business class air tickets, butter, ghee |
| 18% | Most services, electronics, restaurants (AC), telecom, IT services |
| 28% | Luxury cars, premium two-wheelers, cement, ACs, refrigerators, tobacco |
| 28% + Cess | Tobacco, pan masala, aerated drinks, sin & luxury goods |
| 3% | Gold, silver, and other precious metals |
| 0.25% | Rough diamonds, precious stones |
GST Tips for Small Businesses
- Register on time — mandatory above ₹40L turnover for goods, ₹20L for services (₹20L / ₹10L for special-category states).
- Use the right invoice format — tax invoice for B2B, bill of supply for exempt items, credit/debit notes for revisions.
- Reconcile GSTR-2B every month — to maximise ITC and avoid notices.
- File GSTR-3B by the 20th — to avoid late fees (₹50/day, ₹20/day for nil returns) and interest.
- Watch the inter-state vs intra-state classification — wrong CGST/SGST/IGST classification triggers reversals and interest.
- Composition scheme — if turnover is below ₹1.5 crore (₹50L for services), opt for composition with a flat 1%-6% rate, but no ITC.