Invoice vs Quote vs Receipt vs Credit Note

Three documents. Three distinct purposes. Confusing them is the fastest way to delay your payment, annoy your accountant, and look unprofessional to clients who know the difference.

Last reviewed 17 Sep 2026.

The one-sentence definitions

1Quote

Before the work. A price estimate for a defined scope. Not a demand for payment. Becomes the basis for the invoice if accepted.

2Invoice

After the work (or at agreed milestone). A formal payment instruction. Creates a legal obligation for the client to pay. The document your accounts-payable department processes.

3Receipt

After payment. Proof that money changed hands. Does not create an obligation — it confirms one was settled. Your client needs this for their records.

Side-by-side comparison

Attribute	Quote	Invoice	Receipt
Timing	Before work starts	Work complete / milestone	Payment received
Legal effect	Offer (revocable)	Obligation (enforceable)	Evidence (discharge)
Tax relevance	None (usually)	Tax point / liability	Proof of tax paid
Numbering	Optional, separate series	Mandatory, sequential	Separate series, sequential
Client action	Accept / negotiate	Pay by due date	File for records
Your action if ignored	Follow up / revise	Escalate / charge interest	N/A — already paid

Typical freelance workflow

1
Send a quote. Define scope, price, timeline, and assumptions. Include an expiry date (e.g., Valid for 30 days).
2
Client accepts. Get written confirmation (email reply, signed PDF, project management tool acceptance).
3
Do the work. Track time, expenses, and scope changes. Any change = revised quote or change order.
4
Issue the invoice. Reference the quote number and/or project name. Use the Invoice Generator.
5
Client pays. Match the payment to the invoice number in your records.
6
Send a receipt. Optional but professional. Confirm amount, date, invoice reference, and payment method.

Common mistakes

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Sending a quote when an invoice is due. The client's finance team cannot pay a quote — it has no legal standing as a payment demand.
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Using invoice numbers for receipts. Keep separate sequences. A receipt numbered INV-2026-0042 implies a second invoice exists.
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Omitting the quote reference on the invoice. The link between quote and invoice is what lets the client approve payment without querying you.
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Calling a deposit request an invoice. If it's a deposit, label it Deposit Invoice or Pro-forma Invoice and reference the final invoice number it relates to.
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Not sending a receipt. Your client's bookkeeper needs it. A one-line email Thanks, received £2,400 for INV-2026-0042 is better than nothing.

Pro-forma invoices

A pro-forma invoice looks like an invoice but is issued before the work is done — typically to request a deposit or to let the client arrange payment in advance. It is not a tax invoice and does not create a tax point. Label it clearly: Pro-forma Invoice — Not a Tax Invoice. When the work is complete, issue the real invoice with a new number and reference the pro-forma.

Credit notes

If you need to cancel or reduce an issued invoice, you issue a credit note — not a negative invoice. Credit notes have their own sequential numbering, reference the original invoice, and explain the reason (return, discount agreed after the fact, error). The Invoice Generator does not produce credit notes; use your accounting software or a dedicated template.

This guide explains document types for freelance workflows. It is not legal advice. Contractual and tax obligations vary by jurisdiction.

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