What Is a Proforma Invoice? (And When to Use One)

A proforma invoice looks almost identical to a regular invoice, but it does a very different job. Confuse the two and you can create accounting and tax problems for yourself and your customer. This guide explains what a proforma invoice is, how it differs from a tax invoice, and the situations where sending one is the smart move.

What a proforma invoice actually is

A proforma invoice is a preliminary bill of sale sent before goods or services are delivered. Think of it as a detailed, good-faith estimate dressed in invoice format. It tells the buyer exactly what they will be charged, in what currency, and on what terms, so they can approve the purchase, arrange payment, or open the paperwork they need before the deal is final.

Crucially, a proforma invoice is not a demand for payment and not a tax document. It does not record a sale in your books and it does not trigger a VAT or sales-tax liability.

Proforma invoice vs invoice

The two documents differ in purpose and legal weight:

• Timing. A proforma is issued before the transaction; a tax invoice is issued after goods or services are supplied.
• Accounting. A proforma is not entered as revenue or a receivable. A tax invoice is, and it forms part of your audit trail.
• Tax. A proforma carries estimated tax for the customer’s planning, but it cannot be used to reclaim input VAT. Only a proper tax invoice can.
• Payment. A proforma invites a decision or an advance; the final invoice records the actual amount owed.
• Numbering. Many businesses use a separate “PRO-” series for proformas to keep them out of the official invoice sequence.

In short: a proforma helps both sides agree on the deal, and the tax invoice closes it.

When to use a proforma invoice

Send one whenever the buyer needs a firm figure before you can deliver or before they can pay. Common cases include:

• Advance-payment or deposit requests, where the customer pays first and you supply afterwards.
• International trade, where customs, import permits, or a letter of credit require a document with values before shipment.
• Corporate purchase approval, where a procurement team needs a document to raise a purchase order or release budget.
• Quoting a custom job where the scope is agreed but you want a more formal document than a basic quotation.

If you only need a lighter, sales-stage estimate, a quotation may be enough. If the buyer needs near-invoice detail to commit, the proforma is the better fit.

How to create one

The structure mirrors a normal invoice (your details, the buyer’s details, line items, currency, estimated tax, and totals) with two differences: the document is clearly titled “Proforma Invoice,” and it states that it is not a tax invoice. You can produce a clean one in under a minute with our free proforma invoice generator, in any currency and with any tax rate.

When the customer approves and you deliver, convert it into a real invoice so the sale is properly recorded. With free invoicing software that conversion is a single click, and your books, taxes, and numbering all line up automatically.

Need to send one today? Open the free proforma invoice generator, or explore the full toolkit on our pricing page.