Invoice vs Quote vs Proforma Invoice: Which One to Send, and When
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Invoice vs quote comes down to timing: a quote proposes a price before the work, a proforma invoice previews the final bill after the client agrees, and an invoice asks for payment once the work is done. They look alike, and clients mix them up, so the label at the top of the document matters as much as the numbers on it.
| Question | Quote | Proforma invoice | Invoice |
|---|---|---|---|
| Purpose | Propose a price so the client can decide | Preview the final bill after agreement | Request payment for work delivered |
| When it is sent | Before any work, while the client is choosing | After the client says yes, before delivery | After delivery or completion |
| Binding | Only once accepted, ideally in writing | No | Yes, as a record of what is owed |
| Triggers payment | No | Sometimes, for a deposit or advance | Yes, by the due date |
| Has an invoice number | No, a quote reference | A reference, not part of the sequence | Yes, unique and sequential |
| Recorded in the books | No | No | Yes, as a receivable and a payable |
| Has an expiry | Yes, a validity date | Usually, a validity date | No, a due date |
Which one do you need right now?
| If you are | Send | |
|---|---|---|
| Telling a prospective client what the job will cost | A quote (or an estimate, if the price may move) | Quote generator |
| Confirming an agreed price so the client can raise a PO or pay a deposit | A proforma invoice | Label the sheet PROFORMA |
| Asking for payment on finished work | An invoice | Invoice builder |
Due date, quickly
Full calculatorWhat a quote is
A quote is a formal price offer sent while the client is still deciding. It lists what you will do and what it costs, and it carries a validity date so an old price cannot be accepted later. It is not a request for payment; the client may accept it, negotiate it, or walk away. SumUp puts the difference plainly: a quote does not assume the client will proceed.
Quote versus estimate
A quote is a fixed price. An estimate is an approximation that can change once the actual hours or materials are known. The two words get used interchangeably, and that is where disputes start, so write "Quote, fixed price" or "Estimate, final amount may vary" on the document itself.
What a proforma invoice is
A proforma invoice is a preliminary bill sent after the client has agreed to go ahead but before the goods ship or the work is done. It looks like an invoice, which is the point: clients use it to raise a purchase order, arrange an advance payment, or clear customs. It is not a demand for payment and is not recorded as a sale, as FreshBooks describes. Label it PROFORMA INVOICE and give it a reference that is not part of your invoice number sequence.
What an invoice is
The request for payment. It carries a unique invoice number, an invoice date, a due date, the itemized lines, the totals, and your payment terms, and it is recorded by both sides. The guide to what is an invoice covers every field, and the payment terms guide covers the due date.
The order they usually come in
- Quote or estimate, while the client decides.
- Proforma invoice, once they say yes, if they need it for a PO, a deposit, or customs. Many small jobs skip this step.
- Invoice, once the work is delivered, with the same line items and a due date.
- Receipt, once it is paid. The invoice vs receipt guide covers that last step.
This comparison was written by Ready Utilities. The distinctions were checked against SumUp and FreshBooks, and the decision table points to the site's own builder. It states nothing about tax treatment in any jurisdiction and is reviewed when those sources update their guidance.
Frequently asked questions
Is a quote legally binding?
Not on its own. A quote becomes part of a binding agreement once the client accepts it, ideally in writing. Until then it is an offer they can accept, reject, or negotiate. Give every quote an expiry date so an old price cannot be accepted months later.
What is the difference between a quote and an estimate?
A quote is a fixed price: if the client accepts, you do the work for that amount. An estimate is an approximation that can change with actual hours or materials. Say which one you are sending, because clients treat them the same unless told otherwise.
Can a quote become an invoice?
Yes. Once the client accepts the quote and the work is done, the same line items become the invoice, with an invoice number, an invoice date, and a due date added. The builder lets you type the lines once and download the PDF.
What is a proforma invoice used for?
It previews the final bill after the client has agreed to proceed but before delivery. Clients use it to raise a purchase order, arrange an advance payment, or clear customs. It is not a demand for payment and is not recorded as a sale.
Does a proforma invoice need an invoice number?
It should carry a reference so it can be matched to the final invoice, but it is not part of your invoice number sequence. Label it clearly as a proforma so nobody records it as a payable.