Free GST Invoice Generator
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What is a GST Invoice?

A GST Invoice is an official document issued by a GST-registered supplier to a buyer for the supply of taxable goods or services. It is a legal requirement under Section 31 of the CGST Act, 2017.

Every registered business in India must issue a GST-compliant invoice that contains specific mandatory fields — including GSTIN, HSN/SAC codes, applicable tax rates (CGST, SGST, or IGST), and the total taxable value.

A valid GST invoice is also required for the buyer to claim Input Tax Credit (ITC) — making accuracy critical.

Mandatory Fields in a GST Invoice

1. Name, address, and GSTIN of the supplier
2. A consecutive serial number (Invoice Number)
3. Date of issue
4. Name, address, and GSTIN of recipient (if registered)
5. Description of goods or services
6. HSN code (for goods) or SAC code (for services)
7. Quantity and unit (for goods)
8. Total taxable value after discount
9. GST rate and tax amount (CGST+SGST or IGST)
10. Place of supply (state name)
11. Signature (digital or physical)

CGST vs SGST vs IGST — What's the Difference?

Our tool automatically splits the GST rate when you choose CGST+SGST (each gets 50% of the total rate), and applies the full rate as IGST for inter-state transactions.

When Do You Need to Issue a GST Invoice?

• When selling taxable goods or services as a registered dealer
• For advance payments received (issue a Receipt Voucher)
• For exports (mark as "Export under LUT" or with IGST)
• For B2B transactions where buyer wants to claim ITC
• Within 30 days of supply of services (for most businesses)
• Within 45 days for banking and insurance companies
• At the time of removal of goods (for supply of goods)