If you have ever ordered goods from a supplier before they were ready to ship, you have likely received a proforma invoice. In India, proforma invoices are widely used in export trade, advance payment requests, and client quotations — yet many business owners confuse them with a regular tax invoice. This guide explains exactly what a proforma invoice is, what it must contain, how it compares to other commercial documents, and when you are legally required to use one.
A proforma invoice is a preliminary document that a seller sends to a buyer before the actual goods are delivered or services are rendered. The Latin word "pro forma" means "as a matter of form" — indicating that this is a document prepared to describe the transaction in advance, not to record a completed sale.
Key characteristics of a proforma invoice:
Proforma invoices serve several practical purposes in the Indian business environment:
In international trade, customs authorities in both India and the destination country require documentation of the goods being shipped before they arrive. Exporters in India submit a proforma invoice to customs as a declaration of the shipment's value, quantity, and description. This is used for customs valuation and to calculate import duties in the destination country.
When a seller requires the buyer to pay in advance (or pay a deposit) before production or shipment begins, a proforma invoice is the standard document used to communicate the amount due. For example, a manufacturer in Rajasthan supplying handloom textiles might send a proforma invoice requesting 50% advance before starting production.
Banks require a proforma invoice when a buyer's bank needs to open a Letter of Credit for international trade. The LC is issued based on the details in the proforma invoice — item description, value, HS code, and shipping terms (Incoterms like FOB or CIF).
Businesses often send proforma invoices to clients as a formal quote. Once the client approves the proforma, the supplier proceeds to supply the goods or services and then issues the final tax invoice. This is especially common in B2B transactions in India where purchase orders need to be raised against a formal document.
Government departments and PSUs in India often ask vendors to submit a proforma invoice before raising an official purchase order. The proforma helps the department allocate budget and seek internal approval for the expenditure.
While there is no specific statutory format prescribed for proforma invoices in India (unlike tax invoices under GST law), the following fields should always be included to make it commercially valid and practically useful:
| Document | Stage | Legal Effect | GST Liability | ITC Claimable? |
|---|---|---|---|---|
| Quotation | Pre-order | Offer, not binding | No | No |
| Proforma Invoice | Pre-shipment / Pre-supply | Declaration / estimate | No | No |
| Purchase Order | Order placement | Binding contract (buyer's acceptance) | No | No |
| Tax Invoice | Post-supply | Demand for payment, GST document | Yes — reported in GSTR-1 | Yes (for buyer) |
| Receipt / Payment Voucher | Post-payment | Acknowledgment of payment received | No (already paid) | No |
In export transactions governed by FEMA (Foreign Exchange Management Act) and Customs Act, the proforma invoice carries more formal weight. The Reserve Bank of India and customs authorities use the proforma invoice for:
For exporters, a well-prepared proforma invoice should also include the HS Code (Harmonised System), country of origin, port of loading and discharge, and whether the supply is under LUT (Letter of Undertaking) for zero-rated GST treatment.
There is no legal mandate on validity, but industry practice in India is 15 to 30 days. After this period, price fluctuations, GST rate changes, or stock availability may make the proforma outdated. It is good practice to clearly state the validity period on the document itself: "This proforma invoice is valid for 30 days from the date of issue."
A typical proforma invoice for an Indian domestic B2B transaction would look like this at the top:
| Field | Example Value |
|---|---|
| Document Type | PROFORMA INVOICE |
| PI Number | PI-2025-0042 |
| Date | 15 March 2025 |
| Valid Until | 14 April 2025 |
| Seller GSTIN | 27AABCS1429B1ZD |
| Item Description | Industrial Pump, Model XP-200, HSN 8413 |
| Qty | 5 Units |
| Unit Price | ₹45,000 |
| IGST @ 18% | ₹40,500 |
| Total Payable | ₹2,65,500 |
| Advance Required | 50% (₹1,32,750) before production |
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Try the Free Tool →No. A proforma invoice is not a legally binding document. It is a statement of intent and estimated cost. The buyer is under no obligation to pay solely on the basis of a proforma invoice. A binding obligation arises only when a purchase order is issued (by the buyer) or a tax invoice is issued (by the seller after supply).
There is no legal requirement to use company letterhead, but it is strongly recommended for credibility. Most Indian businesses issue proforma invoices on their standard invoice template with the company logo, address, and GSTIN, simply changing the heading from "Tax Invoice" to "Proforma Invoice." This avoids confusion and maintains professionalism.
Yes — but it is not a direct conversion. Once the goods are delivered or services are rendered, the seller raises a fresh tax invoice with a new invoice number. The tax invoice may reference the proforma invoice number for tracking purposes, but it is a new document with its own serial number as required under GST rules. The proforma invoice number and the tax invoice number must always be different.
A quotation is an informal price estimate, often sent via email or letter, and may not follow any standard format. A proforma invoice, on the other hand, has the structure and visual format of a real invoice and is used when a more formal document is required — such as for customs, bank LCs, or advance payment processing. In practice, many Indian businesses use the terms interchangeably, but for export and banking purposes, a proforma invoice carries more weight.