GST Calculator
Calculate GST on any transaction across 5%, 12%, 18%, and 28% slabs — with CGST/SGST split for intra-state and IGST for inter-state.
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How this calculator works
GST (Goods and Services Tax) replaced 17+ indirect taxes in India in 2017. It has 4 main rate slabs. For intra-state transactions, GST is split equally into CGST (Central) and SGST (State). For inter-state transactions, it's a single IGST (Integrated GST). Businesses can claim input tax credit on GST paid on purchases.
GST = Base amount × Rate% | Total = Base + GST | Intra-state: CGST = SGST = GST ÷ 2 | Inter-state: IGST = GST
Last updated: March 2026 · Rates and slabs updated for FY 2025-26
Input tax credit reduces cost
If you're GST-registered, GST you pay on purchases (input) can be offset against GST you collect from customers (output).
Reverse charge applies
For certain services (legal, security, GTA, etc.), the buyer pays GST directly to the government — not the supplier. Know the list.
File GSTR-1 and GSTR-3B monthly
Missing GST filing deadlines attracts 18% interest + ₹50/day late fee. File on time even if there are zero transactions.
Frequently Asked Questions
India has four main GST slabs: 5% (essential goods, food, transport), 12% (processed food, business services), 18% (most services, software, electronics, restaurants), and 28% (luxury goods, automobiles, tobacco). Some items are 0% or exempt.
For intra-state transactions (seller and buyer in same state), GST is split into CGST (Central GST) and SGST (State GST) — each half of the total rate. For inter-state transactions, a single IGST (Integrated GST) at the full rate applies.
To find the base price from a GST-inclusive price: Base price = Inclusive price ÷ (1 + GST rate). Example: ₹1,180 with 18% GST → ₹1,180 ÷ 1.18 = ₹1,000 base price, ₹180 GST.
GST registration is mandatory if your annual turnover exceeds ₹20 lakhs for services (₹10 lakhs in some states) or ₹40 lakhs for goods. E-commerce sellers must register regardless of turnover.