What Is a Proforma Invoice? How It Works Under GST in India in 2026
A proforma invoice is sent before the sale happens. It is not a tax invoice, creates no GST liability, and cannot be used for ITC claims. But most Indian businesses confuse the two, and that confusion leads to real compliance problems. Here is what a proforma invoice is and how to use it correctly.
A proforma invoice is a document you send to a buyer before the actual sale happens. It shows what you plan to supply, at what price, and under what terms. It is not a tax invoice. It does not create a GST liability. The buyer cannot use it to claim input tax credit. Think of it as a formal quotation in invoice format, sent before the deal is confirmed.
If you want to create a proforma invoice that automatically converts to a GST tax invoice once the order is confirmed, that part of the process can be handled without manual rework.
What Makes a Proforma Invoice Different from a Tax Invoice?
This is the question most Indian businesses get wrong.
A tax invoice is issued after the supply happens. It creates GST liability. It must follow a strict format under the CGST Act. The buyer claims ITC on it. It gets reported in GSTR-1.
A proforma invoice is issued before the supply happens. It creates no GST liability. It has no prescribed format under GST law. The buyer cannot claim ITC on it. It does not get reported in any GST return.
The GST Act does not even mention the term "proforma invoice." It is a commercial document, not a statutory one.
One mistake that causes real problems: issuing a tax invoice too early, before the supply has happened, just because the buyer asked for a price estimate. That triggers GST liability before the money has come in. Always send a proforma first. Issue the tax invoice after the supply or advance payment, whichever applies.
Muskaan Kapoor
When Do You Use a Proforma Invoice?
- Before confirming an order: The buyer wants to know the price, taxes, and terms before saying yes. A proforma gives them that in writing.
- When asking for advance payment: Many businesses issue a proforma invoice before collecting an advance. The buyer pays against it. The tax invoice is issued after supply.
- For imports and exports: Customs authorities in both countries need a proforma to estimate duties before the shipment moves. The buyer's bank may also need one to open a Letter of Credit.
- For government tenders: Some government bodies require a proforma invoice along with your bid.
- For internal purchase approvals: Large companies need documented price quotes before their finance team releases a purchase order. A proforma serves as that document.
Does a Proforma Invoice Include GST?
The document itself does not create GST liability. But it is good practice to show the estimated GST breakup clearly so the buyer knows the total outgo.
One nuance that most articles miss: if the buyer pays an advance against a proforma invoice, GST treatment depends on what you are supplying.
For goods, GST is generally not payable on advance received. You collect the advance, issue a receipt, and pay GST only when you issue the tax invoice at the time of supply.
For services, GST may become payable when the advance is received. The time of supply for services is the earlier of: the invoice date, the date of completion of service, or the date of receipt of payment. If you receive payment before issuing the invoice, GST becomes due at that point. Issue a receipt voucher for the advance and report it as required.
What Should a Proforma Invoice Contain?
There is no prescribed format under GST law. But a well-made proforma should have:
- The heading "Proforma Invoice" clearly at the top. Not "Invoice." Not "Tax Invoice." If the heading says "Invoice," it may be treated as a tax document by the buyer or auditors.
- Your business name, address, and GSTIN
- The buyer's name, address, and GSTIN (if they are GST registered)
- A proforma invoice number in a separate series from your tax invoices (for example, PI-2026-001, PI-2026-002)
- Date of issue and validity period (typically 15 to 30 days)
- Description of goods or services with HSN or SAC code
- Quantity and rate per unit
- Estimated GST breakup showing CGST, SGST, or IGST separately
- Total estimated value
- Payment terms
- Delivery timeline and shipping terms (for exports, include port of loading)
- Bank details if you are asking for advance payment
Muskaan Kapoor
How to Number a Proforma Invoice
Keep proforma invoice numbers in a separate series from your tax invoices. Many businesses use a prefix like PI, PF, or PRO followed by the year and a running number. PI-2026-001, PI-2026-002, and so on.
Mixing proforma numbers with tax invoice numbers causes problems during GST audits and internal reviews. Auditors look for continuity in tax invoice numbering. A gap caused by a proforma number that got mixed in raises unnecessary questions.
How to Convert a Proforma Invoice to a Tax Invoice
Once the order is confirmed and the supply happens, issue a fresh tax invoice. The tax invoice number must be new. You cannot use the proforma number as the tax invoice number.
You can reference the proforma invoice number in the tax invoice for cross-referencing purposes. Something like: "Against Proforma Invoice PI-2026-001 dated 1 June 2026."
A clear example:
Proforma Invoice PI-2026-001 sent on 1 June 2026. Buyer confirms order on 3 June 2026. Goods dispatched on 5 June 2026. Tax Invoice INV-2026-042 issued on 5 June 2026, referencing PI-2026-001.
The tax invoice carries the actual GST liability. The proforma is now just a reference document.
Common Mistakes to Avoid
- Sending it as an editable Word or Excel file: The buyer can change the amounts before showing it to their bank for a Letter of Credit. Always send it as a locked PDF.
- Using it as a tax invoice: A proforma cannot replace a tax invoice for GST compliance. Once the supply happens, issue a proper tax invoice.
- Mixing it with your tax invoice number series: Keep both series separate.
- Not mentioning bank details on advance payment proformas: If you are asking for advance, your account number and IFSC must be on the document.
- Not mentioning currency for exports: Write the amount in the agreed foreign currency and mention the exchange rate if relevant. An amount in INR on an export proforma creates confusion for customs and the buyer's bank.
- No validity date: A proforma without a validity period stays technically open forever. Put a date. 15 to 30 days is standard.
Can You Cancel a Proforma Invoice?
Yes, at any point before the supply happens. A proforma invoice creates no GST liability, so there is no reversal required. Just mark it as cancelled in your records and note the reason. No return filing is affected.
Proforma Invoice vs Tax Invoice: Side by Side
Muskaan Kapoor
FAQs
What is a proforma invoice in GST?
A proforma invoice is a pre-sale document sent to a buyer before supply happens. It shows estimated price, taxes, and terms. It does not create GST liability, cannot be used for ITC claims, and is not reported in any GST return. The GST Act has no specific rules for it.
Is GST applicable on a proforma invoice?
No, GST is not applicable on a proforma invoice. Issuing a proforma invoice does not create GST liability. GST becomes applicable when the tax invoice is issued or when supply or payment happens, whichever comes first under the time of supply rules.
Can a buyer claim ITC on a proforma invoice?
No, a buyer cannot claim ITC on a proforma invoice. Input tax credit can only be claimed on a valid GST document: a tax invoice, debit note, or bill of entry. A proforma invoice does not qualify.
What is the difference between a proforma invoice and a quotation?
Both are pre-sale documents. A quotation is usually a simple price list. A proforma invoice looks like an invoice: it includes item-level details, GST breakup, payment terms, and delivery terms. It is more formal and is accepted by banks, customs, and government bodies where a quotation is not.
Can you receive advance payment against a proforma invoice?
Yes, you can receive advance payment against a proforma invoice. But once you receive the advance, you must issue a receipt voucher. For services, GST may become due at that point. For goods, GST is generally due at the time of supply, not when the advance is received.
Does a proforma invoice need an IRN or QR code?
No. E-invoicing requirements apply only to tax invoices. A proforma invoice is not a statutory GST document and does not need to be registered on the Invoice Registration Portal.
