BillmanWhat is a GST invoice?
A GST tax invoice is the bill a GST-registered business issues when it sells taxable goods or services. It records the sale, the GST charged, and lets a business buyer claim input tax credit on it.
Businesses under the composition scheme, and sellers of only exempt goods, issue a bill of supply instead, which shows no GST.
What a GST invoice must show
- Your name, address and GSTIN.
- A unique invoice number in one continuous series for the financial year, up to 16 characters, and the invoice date.
- The buyer’s name and address, and their GSTIN if they are registered.
- Place of supply (the buyer’s state) for sales to another state.
- For each item: description, HSN or SAC code, quantity, unit, rate and taxable value.
- GST rate and amount, shown as CGST + SGST or as IGST.
- Total value, and whether tax is payable on reverse charge.
- Your signature or digital signature.
HSN code: 4 digits or 6 digits?
| Your annual turnover | HSN on invoices |
|---|---|
| Up to ₹5 crore | 4 digits on B2B invoices |
| Above ₹5 crore | 6 digits on all invoices |
How to use this invoice generator
- Fill in your business details and the buyer’s details.
- Pick same state (CGST + SGST) or other state (IGST).
- Add each item with its HSN code, quantity, rate before GST and GST rate.
- Check the live preview, then download the invoice as a PDF.
How many copies?
For goods, make three copies: the original for the buyer, the duplicate for the transporter, and the triplicate for your records. For services, two copies are enough: the original for the buyer and the duplicate for you.
The most common invoice mistake
Skipping or reusing invoice numbers. Numbers must run in one series without gaps or duplicates for the whole financial year, and restart only from 1 April. Billing software numbers invoices for you, which avoids the problem.