A proforma invoice looks almost identical to a real invoice: your details, the client's details, line items, and a total. The difference is intent. A real invoice says "this is owed, pay it". A proforma says "here is what it will cost if you confirm". It is a commitment device, not a payment demand.
What it is, precisely
A proforma invoice is a pre-sale document that states the price, scope, and terms of work you propose to deliver. Because it is not a demand for payment, in most countries it does not belong in your legal invoice sequence and usually carries no tax obligation by itself. The word "proforma" on the page is what separates it; without that label, clients and accountants will treat it as a real invoice and confusion follows.
The four situations where it earns its keep
- Custom work before a deposit. The client approves the proforma, pays the deposit against it, and you start. Nobody argues scope later because the document they approved is the scope.
- Export and shipping paperwork. Customs in many countries accepts a proforma for valuation. If you sell across borders, expect freight forwarders to ask for one.
- New clients who need internal approval. Big companies route purchases through a purchase order process. A proforma gives their finance team exactly what they need to issue that PO.
- Holding a price or a slot. Add a validity line ("valid for 30 days") and the proforma quietly protects your quote against material price changes.
What goes on it
Everything a real invoice has, with two exceptions and one addition:
- The label. "Proforma Invoice" as the title, so nobody mistakes it for a payable bill.
- The validity period. How long you will honor the quoted price.
- No tax invoice framing. In most jurisdictions you do not charge or declare VAT on a proforma. This varies by country, so if you are registered for VAT and sell internationally, confirm the local rule.
The cleanest habit: number proformas in their own series (PF-2026-014) so they never touch your legal invoice numbers. See our invoice number guide for why the legal sequence should stay unbroken.
Proforma vs its neighbors
- vs a quote or estimate. Functionally similar, cosmetically stronger. A quote reads like a sales document; a proforma reads like a preview of the invoice, which is exactly what an accounts-payable department wants to see.
- vs a purchase order. The PO is the client's document promising to pay; the proforma is yours describing what they will pay for. International deals often run both, cross-referencing each other.
- vs the real invoice. The real invoice is issued after delivery or at the agreed milestone, enters your sequential numbering, and starts the payment clock. See our comparison of the invoice, receipt, and estimate for where each document sits in the transaction.
How it converts into a real invoice
When the client confirms, issue the real invoice. Copy the line items from the proforma, apply the real invoice number from your legal sequence, and reference the proforma in the notes ("per proforma PF-2026-014"). If they paid a deposit, show it as a line subtracted from the total so the remaining balance is unambiguous. Then send it the right way; our invoice sending guide covers the subject line and timing.
Draft your proforma and the final invoice from the same tool with the free invoice generator.