A Proforma Invoice is a document the seller prepares and sends to the buyer before goods are shipped, used to confirm in advance the information about the goods, price, and expected transaction terms. It is considered a detailed draft of the commercial invoice, has no payment value, and is not used for official customs declaration.

Many newcomers to import-export often confuse a proforma invoice with the official commercial invoice, and are unclear on when a proforma invoice should be issued or what content it must include. The article below sets out the full concept, role, content, issuance process, and key points to note when using a proforma invoice in import-export.

1. What Is a Proforma Invoice? (Proforma Invoice Meaning)

A Proforma Invoice, abbreviated PI, is a preliminary or courtesy invoice prepared and sent by the seller to the buyer before the goods are shipped, to reconfirm the commitments, terms, and conditions of the transaction the two parties have already agreed on.

In terms of format, a Proforma Invoice looks almost identical to a Commercial Invoice, but it carries no legal value for demanding payment, and is usually stamped or clearly marked “PROFORMA” in the heading to distinguish it from the official invoice.

Proforma Invoice Meaning: Full A-Z Guide

Real-world example: Before signing the official contract, an importer in Germany asks a supplier in Vietnam to send a Proforma Invoice to confirm the quantity, unit price, and delivery terms, which the German company then uses as a basis to apply for an import license and open an L/C before the goods are actually manufactured and shipped.

2. The Role of a Proforma Invoice in Import-Export

A Proforma Invoice helps both parties agree on transaction terms in advance, minimizing errors in quantity, unit price, or payment terms before the official commercial invoice is issued.

  • A basis for negotiation: helps the buyer and seller review and adjust terms before signing the official contract.
  • Supports import license applications: many countries require a Proforma Invoice as the basis for a business to apply for an import license before the goods are shipped.
  • Supports opening a letter of credit (L/C): banks may require a Proforma Invoice as a preliminary basis to open an L/C before the official commercial invoice is available.
  • Reduces the risk of disputes: confirming information in advance helps both parties limit discrepancies and complaints that could arise when the official commercial invoice is prepared.

3. When Should a Proforma Invoice Be Used?

A Proforma Invoice is typically issued before the official contract is signed, or before the goods are packed and shipped, whenever the parties need a detailed basis to agree on transaction terms.

  • When the buyer requests a detailed quotation: before deciding to place an official order.
  • When an import license or specialized paperwork is needed: some regulatory authorities require a Proforma Invoice as the basis for reviewing an application before the goods arrive.
  • When opening an L/C or making a deposit: the bank or buyer needs a preliminary document to confirm the expected transaction value.
  • When the goods or transaction information are not yet ready for a Commercial Invoice: for example, the goods haven’t been loaded into a container yet, or the two parties haven’t finalized the last terms.

4. Content That Should Be Included on a Proforma Invoice

A complete Proforma Invoice should display party information, a description of the goods, unit price, delivery terms, and the expected payment method, similar in structure to a Commercial Invoice but of a preliminary nature.

  • Seller and buyer information: company name, address, contact details.
  • Proforma Invoice number and issue date: for easy reference during negotiation.
  • Description of goods: product name, expected HS Code, quantity, unit price, and expected total value.
  • Delivery terms (Incoterms) and expected payment method.
  • Estimated Shipment Date.
  • A note stating “PROFORMA INVOICE” or “This is not a Commercial Invoice”: clearly indicating this is a preliminary document, not to be used for payment.

5. Distinguishing a Proforma Invoice from a Commercial Invoice

A Proforma Invoice is a preliminary draft that can be adjusted before the final agreement, while a Commercial Invoice is the official invoice, carrying legal value for payment and customs declaration.

CriteriaProforma InvoiceCommercial Invoice
NatureA courtesy invoice, draft/preliminary quotationThe official commercial invoice, with legal value
Time of issuanceBefore the official contract is signed or before shipmentAfter both parties have finalized the sales agreement
Legal valueNo payment value; for reference onlyValid for payment and as a basis for customs declaration
Ability to adjustCan be revised multiple times before both parties sign offCannot be changed after issuance; only a revised/replacement invoice can be issued
Purpose of useQuotation, applying for an import license, opening a preliminary L/CPayment, customs declaration, tax calculation

6. The Process of Issuing a Proforma Invoice

The process of issuing a Proforma Invoice consists of: the buyer requesting a quotation, the seller preparing the Proforma Invoice, both parties reviewing and adjusting it, and the seller issuing the official Commercial Invoice once the goods are ready to ship.

Step 1: The buyer requests a quotation or confirmation of terms

The buyer contacts the seller to request a detailed quotation or confirmation of the expected transaction terms before placing an official order.

Step 2: The seller prepares and sends the Proforma Invoice

The seller drafts a Proforma Invoice showing full details of the goods, unit price, delivery terms, and expected payment method, and sends it to the buyer for review.

Step 3: Both parties review and adjust the content

The buyer checks the information on the Proforma Invoice and may request adjustments to the quantity, unit price, or terms before final agreement.

Step 4: Order confirmation and production/shipment

Once both parties agree on the content of the Proforma Invoice, the buyer confirms the order, and may make a deposit or open an L/C based on this document.

Step 5: Issuing the official Commercial Invoice

Once the goods are packed, ready to ship, or already loaded on the vessel, the seller issues the official Commercial Invoice as the basis for payment and customs declaration.

7. Advantages and Disadvantages of a Proforma Invoice

A Proforma Invoice helps both parties agree on terms before the official agreement, but it carries no legal value for payment or customs declaration.

Advantages:

  • Helps both parties confirm goods information and price in advance, reducing errors when preparing the official commercial invoice.
  • Helps the buyer apply for an import license, open an L/C, or complete preparatory procedures before the goods arrive.
  • Can be revised multiple times, offering flexibility during negotiation.

Disadvantages:

  • No legal value for payment or official customs declaration.
  • Easily confused with a Commercial Invoice if not clearly marked “PROFORMA” on the document.
  • Not accepted by banks or customs authorities as a substitute for the commercial invoice in the official dossier.

8. Common Mistakes When Using a Proforma Invoice

The most common mistake when using a Proforma Invoice is using it for official customs declaration or payment, or failing to update the information when the Commercial Invoice is later issued.

Common MistakeConsequenceHow to Fix It
Using a Proforma Invoice for customs declarationThe customs authority rejects the dossier and requests a Commercial InvoiceOnly use a Proforma Invoice during negotiation/licensing stages; always prepare a Commercial Invoice for declaration
Not clearly marking the document “PROFORMA”Easily mistaken for the official commercial invoice, causing payment disputesAlways mark “PROFORMA INVOICE” clearly in the document heading
Information doesn’t match the later Commercial InvoiceCreates difficulty reconciling records for L/C or import license applicationsUpdate all final information when issuing the official Commercial Invoice
Using a Proforma Invoice to request paymentThe bank or partner refuses payment since the document has no legal valueOnly use the Commercial Invoice as the basis for an official payment request

Real-world example: An importer sent a Proforma Invoice to the bank to open an L/C, but the unit price on the later official Commercial Invoice turned out to differ, causing the bank to request an explanation and delaying the payment process.

9. Legal Regulations Related to the Proforma Invoice

Vietnamese law currently has no separate regulation defining or directly governing the Proforma Invoice, since it is a document rooted in international trade custom rather than a VAT invoice or sales invoice as regulated under Vietnam’s invoice and document laws.

By contrast, the Commercial Invoice is directly linked to the export invoice under Decree 123/2020/ND-CP on invoices and documents, and is a mandatory document in the customs dossier under Customs Law No. 54/2014/QH13 and Circular 38/2015/TT-BTC (as amended by Circular 39/2018/TT-BTC and Circular 121/2025/TT-BTC).

10. Frequently Asked Questions About the Proforma Invoice (FAQ)

Can a Proforma Invoice be used for customs declaration?
No. A Proforma Invoice is only preliminary and has no legal value; the customs dossier must use the official Commercial Invoice.

Does a Proforma Invoice need the buyer’s signature?
Not necessarily. A Proforma Invoice usually only needs the seller’s confirming signature; the buyer expresses agreement by confirming the order or opening an L/C based on this document.

Can a Proforma Invoice be revised after it’s issued?
Yes. A Proforma Invoice can be revised multiple times in terms of quantity, unit price, or terms until both parties agree and the seller issues the official Commercial Invoice.

Is a Proforma Invoice the same as a Quotation?
Not entirely. A Proforma Invoice is more detailed than a regular quotation, has the full format of a commercial invoice, and is commonly used as the basis for an import license application or opening an L/C.

Will a bank accept a Proforma Invoice to open an L/C?
Yes. Many banks accept a Proforma Invoice as a preliminary basis to open a letter of credit (L/C) before the official Commercial Invoice is available.

Is a Proforma Invoice required in every import-export transaction?
No. A Proforma Invoice is only necessary when the parties need to confirm terms in advance, apply for a license, or open an L/C; many simple transactions can skip this step and issue the Commercial Invoice directly.

How long is a Proforma Invoice valid?
There is no fixed validity period set by law; the seller usually sets a validity period on the document itself (e.g. “Valid for 30 days”) to limit how long the quoted price and terms apply.

What should businesses keep in mind when preparing a Proforma Invoice?
Businesses should clearly mark “PROFORMA INVOICE” in the heading, fully display the goods information and expected terms, and ensure the information is consistent with the Commercial Invoice to be issued later.

3W Logistics – Supporting Import-Export Documentation

Preparing an accurate, consistent Proforma Invoice and Commercial Invoice helps businesses negotiate smoothly and clear customs quickly. 3W Logistics works alongside import-export businesses to standardize all international trade documentation.

  • Standard documentation consulting: helps draft a Proforma Invoice and Commercial Invoice that meet international standards, reducing errors during negotiation and customs declaration.
  • Support for L/C and license procedures: advises on using the Proforma Invoice correctly at each stage of the transaction.
  • Ensuring documentation consistency: reviews the information between the Proforma Invoice and Commercial Invoice before official issuance.

Businesses needing consulting on Proforma Invoice and other export-import documents, please contact 3W Logistics directly for support.

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