GST · 26 June 2026
Is a Proforma Invoice a Valid Tax Document Under GST?
A proforma invoice is a preliminary quote dressed as an invoice: it tells a buyer what a supply will cost, the items, the likely GST, and the terms, before any sale is committed. GST law does not define or recognise it as a tax document. It creates no GST liability for the seller, lets the buyer claim no input tax credit, and is not one of the documents listed in Section 31 of the CGST Act or Rule 46. Once the goods or service are actually supplied, the seller must issue a real tax invoice (a pakka bill) carrying the GSTIN, a unique invoice number, and the tax split. A proforma is useful for advance approvals, purchase orders, and customs or loan paperwork, but it can never stand in for the tax invoice.
By Mrs. Swapna Patel
Last reviewed
26 June 2026
In this section
Answers
- Is a Proforma Invoice a Valid Tax Document Under GST?
- What Is GSTR-1, the GST Return of Outward Supplies?
- What Is GSTR-3B, the Monthly GST Summary Return?
- What Is the Time of Supply Under GST, and When Does Tax Become Due?
- Advance Receipt Under GST: When Do You Issue a Receipt Voucher?
- Credit Note vs Debit Note Under GST: When Do You Issue Each?
- What Is GSTR-2B, and Why Does It Now Decide Your Input Tax Credit?
- What Is the Value of Supply Under Section 15 of the CGST Act?
- What Are the GST Rate Slabs in India After the GST 2.0 Reform?
- Exempt vs Nil-Rated vs Zero-Rated Supply: What Is the Difference?
A proforma invoice is just the invoice you send first, so it works for GST and for the buyer's tax records.
A proforma invoice is not a tax document under GST: it charges no tax, supports no input tax credit, and must be replaced by a tax invoice under Section 31 of the CGST Act once the supply happens.
What is a proforma invoice under GST?
Short answer
A proforma invoice is a preliminary cost estimate sent before a sale is committed; it previews the items, price, and likely GST, but GST law does not list it as a tax document under Section 31 of the CGST Act.
It looks like an invoice and is often labelled "proforma" so neither side mistakes it for the real thing. It is issued to get a purchase order approved, to support a loan or customs file, or to confirm scope before work starts.
- It is a commitment-stage document: nothing has been supplied yet.
- It can be revised freely, because it does not enter anyone's GST returns.
- It carries no unique tax-invoice number under Rule 46 and creates no statutory record.
Why is a proforma invoice not a tax document?
Short answer
Because no supply has happened: it triggers no GST liability for the seller, and under Section 16 of the CGST Act the buyer cannot claim input tax credit against it, since ITC needs a valid tax invoice.
- No output tax: the seller does not account for any GST on a proforma, because the tax point arises only on the actual supply.
- No input tax credit: the buyer cannot use a proforma to claim ITC; only a Rule 46 tax invoice or a debit note supports a claim.
- No audit standing: a proforma is not the record an officer accepts as proof of a taxable supply.
- Why it matters: relying on a proforma for tax purposes leaves both sides without a defensible document if the supply is questioned.
Proforma invoice vs tax invoice vs quotation: what is the difference?
Short answer
A quotation opens negotiation, a proforma confirms the intended terms and likely tax, and a tax invoice is the only one of the three that carries a GST liability and supports input tax credit.
| Document | When it is issued | GST standing |
|---|---|---|
| Quotation | To propose a price, early in talks | None; purely indicative |
| Proforma invoice | After terms are agreed, before the supply | None; no liability, no ITC |
| Tax invoice (pakka bill) | On or after the actual supply | Carries GST; supports the buyer's ITC under Section 16 |
Only the tax invoice is a GST document under Section 31, CGST Act and Rule 46. For the wider set, see invoice vs receipt vs quotation.
When should you send a proforma invoice?
Short answer
Send a proforma to get an order or budget approved before you supply, then issue the actual tax invoice under Section 31 once the goods or service are delivered.
- Advance approval: when a buyer's finance or procurement team needs a figure to raise a purchase order.
- Cross-border and loan files: when customs, a bank, or a grant body wants an estimate before payment.
- Advances: a proforma can request an advance, but the GST-correct document for money received before supply is a receipt voucher, not the proforma itself.
- The hand-off: the moment the supply happens, the proforma is replaced by a tax invoice carrying the GSTIN, a unique number, and the CGST/SGST or IGST split.
References & related
Primary sources
- Section 31, Central Goods and Services Tax Act 2017 (tax invoice) — India CodeThe obligation to issue a tax invoice on a supply; the proforma is not among the recognised documents.
- Rule 46, Central Goods and Services Tax Rules 2017 (tax invoice contents) — CBICThe mandatory fields of a GST tax invoice, which a proforma does not satisfy.
- Section 16, CGST Act 2017 (input tax credit conditions) — India CodeITC requires a valid tax invoice or debit note; a proforma is neither.
Last reviewed: 26 June 2026