Free GST Invoice Generator Online: Rules, Format & Invoicing Guide for India (2026)

Under Indian GST law, generating a compliant tax invoice is mandatory for registered businesses supplying taxable goods or services. Failing to include required fields like 15-digit GSTINs, sequential invoice numbers, or HSN/SAC codes can delay client payments and forfeit Input Tax Credit (ITC).

Mandatory Fields on a Valid Indian GST Tax Invoice

According to Rule 46 of the CGST Rules, every tax invoice must contain the following specific data points:

• Supplier Details: Legal or trade name, registered business address, and 15-character GSTIN.
• Consecutive Serial Number: A unique numerical, alphabetical, or alphanumeric sequence not exceeding 16 characters for the fiscal year.
• Date of Issue: The calendar date the invoice was raised.
• Recipient Details: Name, address, and GSTIN/UIN (for B2B registered buyers) or delivery address (for B2C unregistered buyers).
• HSN / SAC Code: 4, 6, or 8-digit Harmonized System of Nomenclature or Services Accounting Code.
• Item Description & Quantity: Clear itemization of services or units sold.
• Tax Breakup:
  • Intra-State Transactions (Within Same State): Equal split between CGST (Central GST) and SGST (State GST).
  • Inter-State Transactions (Across States): Unified IGST (Integrated GST).
• Authorized Signature: Physical signature or digital verification by the proprietor or designated partner.

How to Generate a GST Invoice Free in Under 2 Minutes

You do not need expensive monthly accounting software just to create professional billing documents. The JogiTools GST Invoice Generator handles state-based tax logic automatically:

1. Enter your business name, GSTIN, and address.
2. Add client billing info and specify the state of supply.
3. Add line items with rates, quantities, and GST percentages (5%, 12%, 18%, 28%). The generator computes CGST, SGST, or IGST dynamically.
4. Click Download PDF to generate a clean, ready-to-send A4 invoice.