How to Create GST Bill (Invoice) – Easy Format (2026 Guide)

Creating a proper GST invoice is very important for every business.
If your bill is wrong, you may face penalty or GST notice.

In this guide, we explain how to create a GST bill in a simple way, even for beginners.

What is a GST Invoice?

A GST invoice (bill) is a document issued by a seller to a buyer which contains:

Details of goods/services

Amount charged

GST tax (CGST, SGST or IGST)

👉 It is proof of sale and required for GST return filing.

Types of GST Invoices

1. Tax Invoice

Used when GST is charged to the customer

2. Bill of Supply

Used by composition dealers (no GST charged)

Mandatory Details in GST Invoice

Every GST bill must include these details:

✔ Basic Details

• Business Name
• Address
• GST Number (GSTIN)

✔ Invoice Details

• Invoice Number (unique)
• Invoice Date

✔ Customer Details

• Customer Name
• Address
• GSTIN (if registered)

✔ Product / Service Details

• Description of goods/services
• Quantity
• Rate (price)
• Total amount

✔ Tax Details

• CGST + SGST (for same state)
• IGST (for interstate)

✔ Final Details

• Total Invoice Value
• Signature (optional but recommended)

Easy GST Invoice Format (Example)

How to Calculate GST (Simple)

Within State (Tamil Nadu to Tamil Nadu)

• CGST = 9%
• SGST = 9%

 Interstate (Tamil Nadu to Karnataka)

• IGST = 18%

Common Mistakes to Avoid

• Wrong GST number
• Duplicate invoice number
• Not mentioning tax breakup
• Incorrect calculation
• Missing customer details

Simple Tips

✔ Use numbering like: 001, 002, 003…
✔ Keep separate series for each year
✔ Maintain proper records
✔ Use billing software for accuracy

Conclusion

Creating a GST invoice is simple if you follow the correct format.
Always ensure:
👉 Proper details
👉 Correct GST calculation
👉 Clear invoice format