A proforma invoice looks like an invoice but isn't one. It's a preview: "if we go ahead, this is what the bill will look like." Nobody owes anything when a proforma is issued, it doesn't go into either side's books as a sale, and it creates no payment obligation. The final invoice — the real one — comes later, after the sale is committed or the work is delivered.
What a proforma invoice actually is
Think of a proforma as a quote dressed in an invoice's clothes. It carries the same layout — your details, the client's details, itemized lines, quantities, rates, a total — but its job is different. A quote proposes; an invoice demands payment; a proforma sits in between: it shows the client exactly what the final invoice will say, before anything is owed.
Because nothing is owed yet, a proforma:
- Isn't recorded as a sale in your accounting. It doesn't count as income.
- Isn't a tax document. In VAT and GST systems, a proforma generally can't be used by the buyer to reclaim tax — only the final invoice can.
- Doesn't get a number from your invoice sequence. Give it its own series (more on this below) so your real invoice numbering stays unbroken.
When a client asks for one — the three common reasons
1. Advance payment. Many companies can't pay anything — including a deposit — without a document in their accounts payable system. A proforma gives them something to pay against before the sale is finalized. Once paid, you follow up with the real invoice. (If you're billing a formal deposit as part of a project, a deposit invoice is often the cleaner tool.)
2. Internal approvals. A manager who needs sign-off from finance or procurement often needs a document that shows the exact final cost, formatted like the bill will be. A quote can be too loose; a proforma shows the real numbers, line by line.
3. Customs and international shipments. When goods cross a border before the sale is complete — samples, goods on approval, replacement parts — customs still needs a document declaring what's in the box and what it's worth. A proforma serves that role pre-sale. For completed international sales, the commercial invoice takes over.
How to label it so nobody mistakes it for a bill
The single most important rule: the document must say "PROFORMA INVOICE" prominently — not just "Invoice." If it reads like a bill, a client's bookkeeper may enter it as a payable, pay it, and then be confused when your real invoice arrives. Worse, a tax authority reviewing your records may question why a document that looks like an invoice was never recorded as income.
Practical labeling checklist:
| Element | On a proforma |
|---|---|
| Title | "Proforma Invoice" — never just "Invoice" |
| Number | Separate series, e.g. PRO-2026-014, not your INV- sequence |
| Dates | Issue date plus a validity date ("prices valid until…"), not a due date |
| Notes | State plainly: "This is not a request for payment and not a tax invoice." |
| Totals | Identical math to what the final invoice will show |
Converting a proforma into the final invoice
When the client confirms — approves the purchase, pays the advance, or the goods ship — issue the real invoice:
- Copy the proforma exactly. Same line items, same rates, same totals. Any surprise difference between the proforma the client approved and the invoice they receive invites a payment delay.
- Give it a real invoice number from your normal sequence.
- Reference the proforma in the notes: "Replaces proforma PRO-2026-014."
- Add the due date and payment terms. This is the document that starts the payment clock.
- If an advance was paid against the proforma, show it as a deduction line so the balance due is unambiguous.
Example: proforma invoice for an advance-payment order
A proforma sent so the buyer's finance team can approve and pay a 40% advance. Note the PRO- number, validity window, and the explicit not-a-tax-invoice statement.
Quick decision rule
Ask one question: does the client owe me this money right now? If yes, send an invoice. If no — you're quoting a committed price, enabling an approval or advance, or shipping pre-sale — send a proforma, label it loudly, and keep it out of your invoice number sequence.
When you're ready to issue either document, the free invoice generator lets you set any document number and title text you need, downloads a clean PDF with no signup or watermark, and autosaves your draft in the browser — so converting a proforma into the final invoice is a two-minute edit. If you're still deciding which pre-sale document fits, see Quote vs Estimate vs Invoice.