Proforma invoice vs invoice vs quote: which to send when

The three documents look nearly identical — a header, line items, a total — which is exactly why they get confused. The difference is what each one commits you to, and mixing them up creates real problems: paying tax on money nobody owes yet, or doing work against a document that binds no one.

The quote: an offer

A quote (or estimate) is sent before the work is agreed. It says: this is what I would do, and this is what it would cost, usually with an expiry date. It commits you to a price if the client accepts within the window — and commits the client to nothing at all. A quote has no invoice number, creates no accounting entry, and should visibly not look like a bill: label it "Quote", give it a validity period, and state what would change the price (scope, rush, materials).

The proforma invoice: a preview

A proforma is sent after agreement but before delivery or payment. It looks like the final invoice — same lines, same total — but it is a preview, not a demand: no payment obligation, no tax event, no entry in your books. Its two real jobs are requesting an advance payment (the client's finance team needs a document to pay against) and clearing approval chains or customs paperwork before the real invoice exists. Label it "Proforma Invoice" and number it in its own sequence — PI-001, not your invoice sequence — so it never burns a real number on a deal that might not close.

The invoice: the demand

The invoice is the real thing: a numbered, dated demand for payment that enters your accounts, starts the payment-terms clock, and — if you are tax-registered — is the tax document with everything that implies. It needs a consecutive number from your real sequence (see numbering formats), an explicit due date, and itemized lines a stranger could approve. Once issued, it is never edited — corrections happen by credit note or a replacement invoice, on the record.

The flow in practice

1. Quote → client accepts (in writing, even one line of email).
2. Proforma → only if an advance is due or their process needs paperwork before delivery. Many projects skip this step entirely.
3. Invoice → on delivery or at the agreed milestone, for the amount actually owed, minus any advance already received.

The mistakes that blur them

• Treating a paid proforma as done. Money received against a proforma still needs a real invoice (or receipt) issued for it — the proforma never becomes the tax document.
• Working from a quote nobody accepted. A quote expires; get the acceptance in writing before it becomes your contract by default.
• Sending an invoice as a negotiation. If the price is still moving, it's a quote. Invoices that get haggled down teach clients that all your invoices are opening offers.

Make the real one now

When it's time for the actual invoice, the free invoice generator produces a numbered, itemized PDF in minutes — and the pre-send checklist catches what delays payment.