One comes before the work. One comes after. Both need to be professional — but they serve completely different purposes. Here's the exact difference between a quote, estimate, proposal, invoice, and receipt — with examples.
🐕 TL;DR
Quote: before work, estimated price. Invoice: after work, payment demand. An accepted quote creates a price agreement. An invoice creates a legal payment obligation. Never issue an invoice higher than the accepted quote without written client agreement.
A quote (also “quotation”) is a document sent before work starts, stating what the work will cost. Key characteristics:
Example quote scenario:
A web designer sends a quote: “Design and develop a 5-page website — £3,500. Valid for 14 days. 50% deposit due on acceptance.” The client replies “Accepted” — the quote is now binding and the deposit invoice can be issued.
An invoice is a document sent after work is delivered (or on a billing milestone), requesting payment. Key characteristics:
Example invoice scenario:
The website is complete. The designer sends Invoice #001: “Website design and development (ref: Quote #Q-2026-04) — £3,500. Less deposit paid: £1,750. Balance due: £1,750. Payment due: 14 days.”
| Document | Timing | Legally binding? | Payment required? | Use when... |
|---|---|---|---|---|
| Estimate | Before work | ❌ No | ❌ No | Scope is unclear, price may vary |
| Quote | Before work | ⚠️ On acceptance | ❌ No | Scope is clear, fixed price |
| Proposal | Before work | ⚠️ On acceptance | ❌ No | New client, complex project |
| Invoice | After work | ✅ Yes | ✅ Yes (by due date) | Work is delivered, payment due |
| Receipt | After payment | Confirms payment | ❌ Already paid | Confirming payment received |
Converting an accepted quote to an invoice is simple. The amounts and line items stay the same — you just change the document type:
With Chaser's Invoice Builder, you can create a professional invoice with all these fields in under 2 minutes — and Chaser automatically sends payment reminders if it goes overdue.
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A quote comes before the work starts — it's an estimate of what the work will cost. An invoice comes after the work is delivered — it's a legal demand for payment of the agreed amount. A quote creates no payment obligation until accepted. An invoice creates a legal obligation to pay by the due date.
A quote can become legally binding once accepted by the client. A formal accepted quote (especially in writing) can constitute a contract. However, an estimate is generally not binding — it's understood to be approximate. If precision matters, use a formal quote or proposal with explicit acceptance terms.
Only if the scope changed and the client agreed to the additional work in writing. If your invoice matches the accepted quote, no issues. If you invoice more without agreement, the client has grounds to dispute the difference. Always document scope changes with a 'change order' or written email agreement before doing extra work.
A quote is a fixed price commitment: if accepted, that is what you charge. An estimate is approximate: it can change based on actual time or materials. Use a quote when you know the exact cost. Use an estimate for exploratory or variable-scope projects. Clients prefer quotes (certainty); freelancers sometimes prefer estimates (flexibility). A clearly labelled document ('ESTIMATE' vs 'QUOTE') prevents disputes.
Simple process: copy the same line items and amounts from your quote. Change the document header from 'QUOTE' to 'INVOICE'. Add: an invoice number, invoice date, due date (e.g. Net 14 from date), and your payment details. Reference the original quote number for traceability. Chaser's Invoice Builder makes this a one-click operation.