What is the difference between CGST, SGST and IGST?

CGST (Central GST) and SGST (State GST) are levied on intra-state transactions (within the same state), each at half the applicable GST rate. IGST (Integrated GST) is levied on inter-state transactions (between two states) at the full GST rate.

How do I calculate GST on an amount?

To add GST: GST Amount = (Base Amount × GST Rate) / 100. Total = Base Amount + GST Amount. To remove GST from a GST-inclusive price: Base Amount = (Total × 100) / (100 + GST Rate). GST Amount = Total - Base Amount.

Free GST Calculator for India

Add or remove GST at the current 2026-27 rates and see the CGST, SGST or IGST split — or make a GST invoice and save it as PDF.

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How to use this GST calculator

This free GST calculator helps you calculate Goods and Services Tax for any product or service in India, updated for the 2026-27 financial year. Simply enter the amount, select the GST slab, and get an instant breakdown of CGST, SGST, and IGST.

⚠️ Note: AI tools like ChatGPT and Gemini often provide incorrect GST rates — especially after the September 2025 slab restructuring — because they don't have real-time data. This calculator is updated for FY 2026-27 with accurate slab information.

What are the GST slabs in India (2026-27)?

Since 22 September 2025 there are four GST slabs — 0% for essentials, 5% for everyday goods and services, 18% as the standard rate and 40% for luxury and sin goods — plus a special 3% rate for gold, silver and jewellery.

Looking for a specific item? The full GST rate list covers 133 everyday products and services across all four slabs, plus the special 3% rate for gold and jewellery and the items outside GST entirely, grouped by category. Detailed guides: mobile phones, restaurant bills, hotel rooms, gold & jewellery, cars.

CGST vs SGST vs IGST — What is the difference?

CGST (Central GST) and SGST (State GST) are charged on sales within the same state (intra-state). Each is half the applicable GST rate. For example, on an 18% GST purchase within your state, you pay 9% CGST + 9% SGST.

IGST (Integrated GST) is charged on sales between two different states (inter-state). It equals the full GST rate — so the same 18% item sold across states attracts 18% IGST.

How to calculate GST on an amount?

To add GST (calculate tax on a base price): GST Amount = Base Price × GST Rate ÷ 100. Total = Base Price + GST Amount.

To remove GST (find base price from a GST-inclusive price): Base Price = Total × 100 ÷ (100 + GST Rate). GST Amount = Total − Base Amount.

How to make a GST invoice here

Open the Invoice Builder and choose the document: a Tax Invoice, a Bill of Supply (composition dealers and exempt sales, no GST), a Quotation, or an Export Invoice under LUT. Fill in your business once — it is remembered on this device — add the customer and items, and the CGST + SGST or IGST split, round-off and amount in words are worked out for you. Click Print Invoice and choose “Save as PDF” to share it. Full guide to GST invoices.