How to Create a GST Invoice: Format, Rules & Free Generator

What a GST Invoice Must Include

For registered businesses, an invoice that follows GST rules isn't optional — it's what lets you (and your buyer) claim input tax credit. Your GST Invoice Generator creates a compliant invoice automatically.

Every GST invoice must show:

Essential field	Example
Supplier name, GSTIN & address	Your registered details
Buyer name, GSTIN & address	Their details (GSTIN if registered)
Invoice number & date	INV-001, date of supply
HSN/SAC code	9987 (service) or goods HSN
GST rate break-up	CGST + SGST (intra-state) or IGST (inter-state)
Taxable value and total	Amount + tax

Step-by-Step: Generate a GST Invoice

Step	What to do
1	Open the GST Invoice Generator
2	Add your business details and GSTIN
3	Add line items with HSN codes
4	Choose the GST rate (it calculates CGST/SGST or IGST for you)
5	Download the invoice as a PDF

GST Rates on the Invoice

The tax split depends on whether the sale is within your state or inter-state:

Situation	Tax columns shown
Within the same state	CGST (2.5/6/9/14) + SGST (2.5/6/9/14)
Different states	IGST (5/12/18/28) — single column

A GST Calculator helps you verify the tax math if you're checking an old invoice or doing a reverse calculation.

Common GST Invoice Mistakes

• Missing HSN code — every line item needs one
• Wrong rate — sold within state but charged IGST
• No invoice number series — must be sequential per financial year
• Round-off errors — round only the final amount, never each line
• Missing buyer GSTIN on business-to-business sales

Skip the Invoice, Use the Other Generators

Not selling yet? You might need these instead:

Document	Tool
Business agreement / quote	Quotation Generator
General invoice (no GST)	Invoice Generator
Check your pricing before you bill	Profit Margin Calculator

FAQ

• Is a GST invoice required for every sale? If you're GST-registered, yes — for taxable supplies. Unregistered sellers follow simpler billing rules.
• What percentage is GST? 0%, 5%, 12%, 18% or 28% depending on the goods/service. The generator applies the HSN-mapped rate.
• Are invoices free to generate? Yes — the generator is free with no signup and no watermark.
• Can I edit an invoice after generating? Download it, and regenerate with the corrected details if something changes.