What is a Proforma Invoice? The Definitive Guide for Small Business & Trade

It looks like an invoice, but it isn't one. Learn exactly when to issue a Proforma Invoice, how it helps with Letters of Credit and Customs, and the mandatory fields required.

Portrait of Laura Mitchell, CPA
Written by CPA Laura Mitchell, CPA
Portrait of Eric McDowell
Technical Review Eric McDowell
Last Updated

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1. What is a Proforma Invoice?

A Proforma Invoice is a preliminary bill of sale sent to a buyer *before* goods are shipped or services are delivered. It outlines the description of items, the price, shipping weight, and transport charges, serving as a commitment from the seller to provide goods at a specified price and date.

The term comes from the Latin meaning "for the sake of form." Unlike a standard invoice, a proforma invoice is not a demand for payment. Instead, it acts as a formal quote or estimate that can be used by the buyer to apply for an import license, open a letter of credit, or arrange financing.

Key Takeaway: A Proforma Invoice has no fiscal value for tax purposes. You do not record it in your accounting books as "Accounts Receivable" until it is converted into a final Commercial Invoice.

2. Proforma vs. Commercial Invoice vs. Quote

Understanding the distinction between these three documents is critical for avoiding accounting errors and customs delays.

Document Type Timing Binding Status Purpose
Quote / Estimate Early Negotiation Non-Binding Rough idea of costs.
Proforma Invoice Before Shipping Good Faith Agreement Finalizing terms, customs declaration, securing deposits.
Commercial Invoice After Shipping Legally Binding Request for payment, tax recording, ownership transfer.

3. When & Why Should You Use a Proforma?

You shouldn't send a proforma for every transaction. However, it is the industry standard in four specific high-stakes scenarios:

A. International Trade & Customs

This is the most common use case. Customs authorities require a document to assess the value of goods *before* they enter the country to calculate duties and taxes. A proforma invoice allows the shipment to clear customs even if the final sale hasn't occurred.

B. Letters of Credit (L/C) for Banks

In international B2B trade, banks often act as intermediaries to guarantee payment via a Letter of Credit. Banks will almost always require a formal Proforma Invoice from the seller to open an L/C for the buyer. The Proforma acts as the proof of the deal's terms.

C. Securing Advance Payments (Deposits)

If you require a 50% deposit to start a project or manufacture goods, you cannot issue a final tax invoice for the full amount yet. A proforma invoice acts as the formal request for this deposit without triggering a tax event for the full value on your books.

D. Internal Approval (Corporate Clients)

Large corporate clients often cannot issue a payment without a Purchase Order (PO). Their Accounts Payable department will use your Proforma Invoice to authorize the budget and generate that internal PO number.

4. Why Excel Templates are Risky for Proformas

Many businesses still use static Word or Excel templates for Proforma Invoices. This creates significant risks, especially regarding validity dates and disclaimers.

Feature Excel / Word Template Our Proforma Generator
Validity Date Often forgotten or static Mandatory Field (Protects your pricing)
Disclaimer Manual copy-paste Auto-Inserted ("Not a VAT Invoice")
Calculations Prone to formula errors 100% Accurate Auto-Calculation
Format Editable (Can be altered) Secure PDF (Professional & Locked)

5. Anatomy: What Must Be Included?

To be valid—especially for customs—a proforma invoice must be precise. Our Proforma Generator includes these fields by default:

Visual Anatomy of a Proforma Invoice template showing mandatory fields
Figure 1: Example of a compliant Proforma Invoice structure created with our tool.
  • Clear Heading: Must be labeled "Proforma Invoice" or "Performa".
  • Validity Date: A "Valid Until" date prevents you from being locked into old prices if costs rise.
  • Party Details: Full names and addresses of Buyer and Seller.
  • Description of Goods: Quantity, unit of measure, weight, and unit price.
  • Shipping Terms: Incoterms (e.g., FOB, CIF) and estimated delivery date.
  • Disclaimer: A statement such as "This is not a VAT invoice."
Document Header
Document Type: PROFORMA INVOICE
Expiration: Valid Until: Dec 31, 2025 ◄ Critical Protection

6. How to Create a Proforma Invoice (Step-by-Step)

Follow this workflow to create a risk-free proforma document that converts to a sale.

1

Start with the Right Template

Don't just rename a standard invoice. Use a specific Proforma template that removes tax demand language and adds validity dates.

2

Set the Validity Date

Prices for raw materials or currency exchange rates fluctuate. Set a validity period (e.g., 30 days) to limit your risk.

3

Itemize & Estimate

List the goods/services as accurately as possible. If costs are estimates, mark them clearly. Include shipping weights for physical goods.

4

Add the "No-Tax" Disclaimer

Ensure the document states: "This is not a tax invoice. A final VAT/GST invoice will be issued upon delivery/payment."

5

Convert to Final Invoice

Once the client accepts or pays the deposit, open your tool and simply change the type from "Proforma" to "Invoice" to finalize the deal.

Is your Proforma approved?

If your client has accepted the quote and you are ready to ship, you need to issue a Commercial Invoice for customs.

7. Frequently Asked Questions

Is a proforma invoice legally binding?
No. A proforma invoice is a preliminary bill of sale or a quote. It is considered a 'good faith' agreement but is not a legally binding demand for payment like a final tax invoice. However, once signed by the buyer, it can serve as a binding contract for the order.
Can I use a proforma invoice for accounting purposes?
No. You should **not** record a proforma invoice in your Accounts Receivable (AR) or Accounts Payable (AP). Since it is not a finalized tax document, it does not impact your VAT/GST returns or income statements until converted into a final invoice.
Can I use a proforma for a Letter of Credit?
Yes. Banks almost always require a Proforma Invoice to open a Letter of Credit (L/C). It provides the bank with the necessary details (price, quantity, shipping terms) to guarantee payment to the seller.

Disclaimer: The information provided in this guide is for educational purposes regarding standard business practices. It does not constitute legal, tax, or customs advice. Regulations regarding proforma invoices vary by country. Always consult a qualified accountant or customs broker for specific transactions.

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