Is a proforma invoice legally binding?

On its own, no — a proforma invoice is a good-faith estimate, not a contract or a demand for payment, and the buyer isn't obliged to pay it. Like a quote, though, a proforma the buyer formally accepts can create a binding agreement in some places. The figures on it can still change before the final invoice — though changing them without warning damages trust.

Can a customer pay against a proforma invoice?

Yes — proformas are commonly used to collect deposits or full prepayment before delivery, especially on goods orders. But payment doesn't turn it into a real invoice: you still need to issue a final invoice with a proper invoice number once the goods or services are delivered.

Can I reclaim VAT from a proforma invoice?

Generally no. In countries with VAT or GST, a proforma is not a valid tax invoice, so it normally can't be used to reclaim input tax. The buyer needs the final tax invoice for that — check the rules where you're registered.

Should a proforma invoice have an invoice number?

It shouldn't take a number from your real invoice sequence, because it isn't a real invoice. Use a separate reference like PF-023 to track it, and assign a proper invoice number only when you issue the final invoice.

Proforma Invoice vs Invoice: What's the Difference?

Jul 31, 2026

A proforma invoice looks exactly like an invoice and behaves nothing like one. It's a preliminary, good-faith document sent before goods ship or work finishes — a detailed statement of what you intend to supply and what it will cost. Nothing is owed when you send it, and nothing enters your books.

This guide covers what a proforma invoice is for, the three situations where one earns its keep, what it can't do — especially around VAT, GST, or sales tax — and how to convert it into a real invoice when the deal goes ahead.

What a proforma invoice is

A proforma invoice is a quote in invoice clothing. It uses the same layout as a real invoice — your details, the buyer's, line items with quantities and prices, an estimated total — but it's issued before delivery, before any obligation to pay exists. In effect it says: if we go ahead, this is what the invoice will look like.

Because nothing has been supplied yet, everything on it is provisional. Prices, quantities, and shipping costs can all change before the final invoice is issued. Label it clearly — the words "Proforma Invoice" should appear prominently, so nobody mistakes it for a demand for payment or, worse, a tax document.

When to send a proforma invoice

International shipping is the classic case. When goods cross a border before a sale is finalized — samples, replacements, goods on consignment — customs authorities in many countries accept a proforma invoice to declare their value. For a confirmed sale the definitive document is usually a commercial invoice, but the proforma often travels first, when final figures don't exist yet.

Prepayment is the second case. If you want a 50% deposit on a $12,000 equipment order before you start building, a proforma gives the buyer exact figures to pay against — a common route for goods orders and international trade, where the goods don't exist yet. Service businesses often issue a numbered deposit invoice instead; either works, as long as any tax due on the prepayment is handled correctly where you're registered.

Internal approval is the third. Many companies can't pay anything without a purchase order, and procurement needs a formal document with exact amounts to raise one. A proforma gives them that — line items, estimated tax, total — so budget sign-off can happen before you commit to the work.

What a proforma invoice is not

It is not a demand for payment. A proforma creates no obligation to pay and no debt you could enforce. If the buyer walks away after receiving one, nothing is owed — which is exactly why it's safe to send before anything is agreed.

It is not a tax invoice. In countries that run VAT or GST systems, a proforma is not a valid tax document: your customer generally can't use it to reclaim input tax, and it doesn't belong on either side's tax return. Any tax shown on it is an estimate, not tax charged — check the rules where you're registered.

And it is not accounts receivable. You don't record a proforma as income or as money owed, and it shouldn't consume a number from your real invoice sequence. Give it its own reference — PF-023, say — so you can track it without polluting your books.

How to convert a proforma into a final invoice

When the deal goes ahead — the buyer pays the deposit, raises a PO, or the goods ship — issue a new document. Don't cross out "proforma" and reuse the old one. The final invoice takes the next number in your real sequence, carries its own issue date, and states what was actually delivered at the prices actually agreed.

Reference the proforma so the paper trail connects: "as per proforma PF-023" in the notes is enough. If figures moved between proforma and delivery — shipping came in higher, a quantity changed — the final invoice shows the real numbers, and it's worth flagging the difference to the buyer before it lands.

Handle prepayments as a deduction, not a mystery: if the client paid $6,000 against a $12,000 proforma, the final invoice shows the full amount, deducts the $6,000 received, and states the balance due. One caveat: in many VAT and GST systems, receiving a prepayment can itself trigger a tax point that requires a tax invoice or receipt at that earlier stage, so check your local rules.

Proforma vs quote vs commercial invoice

A proforma and a quote do the same commercial job: both offer terms, neither demands payment. The difference is formality. A quote can be a two-line email; a proforma mirrors the layout of a final invoice, which is why banks, customs, and procurement departments will often accept one where a casual quote won't do.

A commercial invoice is the customs counterpart. It's the definitive document for an international sale — the paperwork customs works from once the shipment is confirmed, carrying fuller detail than a proforma does. A proforma may precede it during negotiation or accompany goods that aren't yet sold; the commercial invoice follows once the sale is real.

At a glance

Proforma invoice: issued before delivery, estimates what a sale will cost, creates no obligation to pay, sits outside your invoice sequence, and is not valid for tax. Final invoice: issued on delivery or an agreed milestone, demands payment by a due date, carries a unique number from your sequence, records accounts receivable, and serves as the tax document where you're registered.