How to Create a GST Invoice: 8 Easy Steps for Small Businesses

Knowing how to create a GST invoice is a basic skill for every small business owner. A correct invoice helps your customer claim tax credit, keeps your returns clean and protects you in any dispute. A wrong one can cause confusion for months.

In this guide, you will learn how to create a GST invoice in 8 easy steps, how to choose between CGST plus SGST and IGST, and the mistakes to avoid. You do not need costly software to follow these steps.

Table of Contents

• Before You Start: Know Your Registration
• How to Create a GST Invoice: 8 Easy Steps
• CGST, SGST or IGST: Which One to Charge
• Simple GST Invoice Example
• Goods vs Services: HSN and SAC
• When the Buyer Has No GSTIN
• How to Number Your GST Invoices
• How to Create a GST Invoice in Excel
• Common GST Invoice Mistakes
• An Offline Tool to Create a GST Invoice
• Frequently Asked Questions

Before You Start: Know Your Registration

Before you learn how to create a GST invoice, check how you are registered. A regular taxpayer issues a tax invoice for taxable sales. A composition dealer, or a seller of exempt goods, issues a bill of supply instead.

If you are not sure about the difference, read our guide on tax invoice vs bill of supply. You can also see the GST bill format with 12 must-have fields.

How to Create a GST Invoice: 8 Easy Steps

Step 1: Choose the Right Bill

Write “Tax Invoice” at the top for taxable sales. Write “Bill of Supply” if you cannot charge GST.

Step 2: Add Seller and Buyer Details

Add your business name, address and GSTIN. Add the buyer’s name and address, and the buyer’s GSTIN if the buyer is registered.

Step 3: Give a Unique Invoice Number

Use a number that is unique in the financial year and not longer than 16 characters. Letters, numbers, hyphen and slash are allowed.

Step 4: Add Items With HSN or SAC

List each item with a description, the HSN code for goods or the SAC code for services, quantity, unit and rate. Show the discount, if any, as a separate line.

Step 5: Apply the Right GST

Calculate the tax on the taxable value, using the rate that applies to your item. Choose CGST plus SGST or IGST, as explained in the next section.

Step 6: Show the Totals

Show the taxable value, the tax amounts, the round off and the grand total. Add the amount in words, as it avoids mistakes.

Step 7: Add Payment Details and Signature

Add your bank details or UPI ID, and the authorised signature. Add a UPI QR if you want the customer to pay with one scan.

Step 8: Save a Copy

Save the invoice as a PDF and keep a copy in a folder for the month. Share the PDF with the customer. A clean record makes return filing easier.

CGST, SGST or IGST: Which One to Charge

This is where most beginners get stuck while learning how to create a GST invoice. The rule is simple.

• Same state: when your state and the place of supply are the same, charge CGST and SGST in equal parts.
• Different state: when the place of supply is in another state, charge IGST.
• Place of supply: it decides the tax type, so check it for every invoice.

GST rates change from time to time, so always confirm the current rate for your item on the GST portal or with your CA.

Simple GST Invoice Example

This is an illustrative example only. It shows how to create a GST invoice for a sale within the same state.

Item	Qty	Rate	Taxable value	GST rate	CGST	SGST
Office chair	2	₹5,000	₹10,000	18%	₹900	₹900
Total			₹10,000		₹900	₹900

The grand total here is ₹11,800: the taxable value of ₹10,000 plus ₹900 CGST and ₹900 SGST.

How to Number Your GST Invoices

Good numbering is part of knowing how to create a GST invoice properly.

• Use a separate series for each type, for example INV-001 for tax invoices and BOS-001 for bills of supply.
• Never repeat a number in the same financial year.
• Do not delete a wrong invoice. Cancel it and keep a note.
• Keep the numbers in order, so a missing number is easy to spot.

Goods vs Services: HSN and SAC

When you learn how to create a GST invoice, you must know the code that fits your sale. Goods use an HSN code. Services use a SAC code. The number of digits you need can depend on your turnover, so confirm it with your CA or on the GST portal.

• Goods: show the HSN code, the quantity and the unit.
• Services: show the SAC code and a clear description of the service.
• Both together: use a separate line for each, with its own code and rate.

When the Buyer Has No GSTIN

Many small sales are to buyers without a GSTIN, such as ordinary customers. You still create a GST invoice for taxable sales, but the buyer’s GSTIN field stays empty. Write the buyer’s name and address if the rules need it for your sale.

Rules for such invoices, including when the buyer’s details are required, depend on the value and the type of sale. Check the latest rules on the official portal. Whatever the case, keep your numbering and your records in order.

How to Create a GST Invoice in Excel

Excel is a popular choice to create a GST invoice, because it calculates the tax for you. A basic setup needs three parts.

• Item table: description, quantity, rate and taxable value.
• Tax columns: a GST rate column and formulas for CGST, SGST or IGST.
• Totals block: subtotal, tax, round off and the grand total.

The taxable value formula is quantity times rate. The GST amount is the taxable value times the rate divided by 100. For the same-state case, split the GST in two equal halves. Read more about formulas in the Microsoft Excel help centre.

Common GST Invoice Mistakes

• Charging CGST and SGST when IGST is needed, or the reverse.
• Leaving out the HSN or SAC code.
• Repeating or skipping invoice numbers.
• Using a tax invoice when a bill of supply is required.
• Not saving a copy of every invoice.

An Offline Tool to Create a GST Invoice

If you want to create a GST invoice without typing every formula, try the SmartDigito Invoice Maker. It works offline in your browser and has modes for a Tax Invoice and a Bill of Supply. It picks CGST plus SGST or IGST from your state and the place of supply, shows the amount in words, adds a UPI QR and saves invoices in your browser.

If you prefer ready Excel, Word and PDF formats, see the GST Invoice Templates Pack.

Frequently Asked Questions

How do I create a GST invoice for the first time?

Choose the bill type, add party details, give a unique number, list items with HSN or SAC, apply the right GST, show totals and save a copy.

Can I create a GST invoice in Excel?

Yes. Excel can calculate the taxable value, GST and total, and you can save the invoice as a PDF.

What is the invoice number limit?

An invoice number should be unique in the financial year and not more than 16 characters.

When do I charge IGST instead of CGST and SGST?

You charge IGST when the place of supply is in a different state from your state.

Final Thoughts

Once you understand how to create a GST invoice, the process takes only a few minutes. Choose the right bill, number it properly, apply the correct tax, and save a copy every time.

Note: This guide is general information, not tax advice. GST rules change, so confirm details on the official portal or with your CA.