How to Make a GST Invoice for Your Small Business in India (Step-by-Step 2026)

Whether you operate a local retail store, a consulting firm, a manufacturing unit, or a growing startup in India, every commercial sale requires a professional, compliant invoice.

Many business owners believe they need expensive accounting software like Tally Prime, Zoho Books, or Vyapar to create professional invoices. In reality, you can generate compliant, print-ready GST invoices 100% free directly in your web browser.

Here is a step-by-step practical guide to creating professional invoices in India.

⚡ Ready to create your bill right now? Open our Free GST Invoice Maker to create, preview, and download your compliant invoice in under 60 seconds.

Step 1: Identify Your Legal Invoice Type

Before writing your bill, confirm which document format you must issue:

1. Tax Invoice (B2B): Issued if you are GST registered and your buyer wants to claim Input Tax Credit (ITC).
2. Bill of Supply (B2C / Composition): Issued if you are not GST registered, or registered under the Composition Scheme, or selling exempt items.
3. Proforma Invoice: An estimate or quote sent before supplying goods or services to request an advance payment.

Step 2: Set Up Consecutive Invoice Numbering

Under GST law, invoice numbering cannot be random. It must adhere to three specific rules:

• Maximum 16 Characters: Can contain numbers, letters, and special characters (hyphens - and forward slashes /).
• Unique Per Financial Year: For financial year 2026–27, a standard pattern is INV/2026-27/001 or INV-26-001.
• Sequential With No Gaps: Tax authorities look for gaps during audits. Always maintain consecutive numbers.

Step 3: Enter Supplier & Recipient Particulars

Every valid invoice must state:

• Your Business Name & Address: Registered trade name and physical office address.
• Your 15-digit GSTIN: Format: 2-digit State Code + 10-character PAN + 1-digit Entity Number + ‘Z’ + 1 Checksum character.
• Customer / Recipient Details: Buyer’s legal business name, address, and GSTIN (if a registered business).
• Place of Supply: State name and 2-digit code (e.g., Maharashtra (27), Karnataka (29), Delhi (07)).

Step 4: Add Line Items with HSN/SAC Codes & Rates

For every product or service provided, record:

• Clear, specific item description (e.g., “Full-Stack Web Application Development”).
• HSN / SAC Code: 4 to 6 digits based on your annual turnover.
• Quantity & Unit of Measurement (e.g., Pcs, Kgs, Hours).
• Unit Price (excluding tax).
• Any trade discounts applied.
• Applicable GST Slab (0%, 5%, 12%, 18%, or 28%).

Step 5: Calculate Taxes Accurately

The Golden Rule of Indian GST:

• Intra-State Supply (Buyer in the same state): Split the tax evenly into Central GST and State GST. $$\text{CGST} = \text{Taxable Value} \times \frac{\text{Rate}}{2}$$ $$\text{SGST} = \text{Taxable Value} \times \frac{\text{Rate}}{2}$$
• Inter-State Supply (Buyer in a different state): Apply the full rate as Integrated GST. $$\text{IGST} = \text{Taxable Value} \times \text{Rate}$$

Our Free Invoice Generator handles this automatically when you select your supply type.

Step 6: Include Payment Terms & Remittance Details

To ensure prompt payments, always print:

• Due date (e.g., “Net 15 Days” or “Due Upon Receipt”).
• Bank Name, Account Number, IFSC Code, and Branch Name.
• UPI ID / QR code for instant mobile payments.
• Terms & Conditions (e.g., interest rate on delayed payments, return policies).

Summary: Avoid the 4 Most Common Invoicing Mistakes

1. Missing Place of Supply: This prevents the buyer from taking input tax credit across states.
2. Incorrect Tax Rate Slabs: Always verify the correct GST rate for your specific HSN code.
3. Mismatched Invoice Dates: The invoice date must precede or match the date of dispatch of goods or provision of services.
4. Using Generic Word/Excel Templates: Manual spreadsheet math often causes paisa rounding errors that get flagged during GSTR-1 filing.