What a proforma invoice is
“Proforma” means “as a matter of form”. A proforma invoice looks like an invoice but is an offer: it lists the goods or services, quantities, prices and the tax the buyer should expect. Neither the CGST Act nor the CGST Rules prescribe it, so it creates no tax liability and gives the buyer no input tax credit. That is exactly why it is useful before a sale: you can send it, revise it and cancel it without touching your GST numbers.
Proforma invoice vs tax invoice
Proforma invoice compared with a tax invoice | Proforma invoice | Tax invoice |
|---|
| Purpose | Offer, quotation, advance request | Records a supply and charges GST |
| Rule | None under GST | Section 31, Rule 46 |
| Number series | Your own quotation series | Consecutive, unique in the FY |
| In GSTR-1 | No | Yes |
| Buyer's credit | No | Yes, once it appears in their 2B |
Advances against a proforma
When a buyer pays an advance against your proforma for services, GST becomes payable on the advance and a receipt voucher is issued (Rule 50). For goods, GST on advances is not payable for most suppliers since Notification 66/2017-CT; tax is charged on the tax invoice at supply. Ask your CA how advances apply to your business.
Tips for a proforma that gets paid
- Write the validity date and what happens to the price after it.
- Use the same descriptions and HSN you will use on the tax invoice, so the buyer's purchase order matches.
- Put your bank details or a UPI QR for the advance, and the delivery period after payment.
Rules as read on 17-10-2026. Check with your CA before relying on them for a filing.