Invoice vs quote vs receipt
Last updated August 2, 2026.
These three documents get used interchangeably, and the confusion costs money. A quote sent as an invoice looks like you are billing for work you have not done. An invoice sent as a receipt tells your client they have already paid. Both happen weekly.
Here is what each one is for, in the order they appear in a job.
A quote comes first
A quote is an offer. It says: here is what I will do, and here is what it will cost. It is not a request for money and no one owes you anything when they receive it.
The thing that makes a quote useful is an expiry date. Materials change price, your calendar fills, and a quote with no expiry is one a client can accept eleven months later at last year’s rate. “Valid until 30 September 2026” costs one line and saves an argument.
Two words worth knowing apart: an estimate is your best guess and may change; a quote is a fixed price you are committing to. Clients hear them as the same word. Say which one you mean on the document.
An invoice comes after the work
An invoice is a request for payment for something already delivered. It is the only one of the three that creates a debt, and the only one your accountant cares about, because it is the point at which revenue is recorded.
It needs a unique number, a date, a due date, and a description specific enough for someone who was not there to approve it. If you are registered for sales tax, it needs your registration number, or your client cannot reclaim the tax.
An invoice should never be editable after it is sent. If something is wrong, issue a credit note or a corrected invoice with a new number and reference the old one. Quietly amending a sent invoice is the single fastest way to fail an audit.
A receipt comes after the money
A receipt is proof that payment happened. It confirms an amount was received, when, and against which invoice. Your client needs it for their records; you need to have issued it so nobody asks twice.
The field people forget is the invoice number the payment settles. A receipt for $1,200 with no reference is useless to a client paying four invoices that month.
For partial payments, say so explicitly: “$500 received against INV-0042; $700 outstanding.” A receipt that does not say it was partial reads as paid in full.
Side by side
| Question | Quote | Invoice | Receipt |
|---|---|---|---|
| When | Before the work | After the work | After payment |
| Creates a debt? | No | Yes | No — it clears one |
| Needs a unique number? | Useful | Required | Required |
| Key extra field | Expiry date | Due date | Invoice it settles |
What about a purchase order?
A purchase order comes from your client, not from you. It is their internal authorisation to spend, and it usually means the money is already approved — which is why an invoice quoting a PO number tends to get paid faster than one without. If a client gives you one, put it on the invoice.
The practical version
- Quote to win the work. Put an expiry on it.
- Invoice to get paid. Number it, date it, and never edit it after sending.
- Receipt to close it. Say which invoice it settles.
The Bindery invoice generator handles the middle one today, and remembers your business details so the next is faster. Quote and receipt tools are next on the same engine.