Quote vs Invoice — What's the Difference?
A quote proposes a price before work starts. An invoice requests payment after work is done. Both are essential documents in a professional billing workflow, but they serve different purposes and come at different stages of a client engagement.
| Dimension | Quote | Invoice |
|---|---|---|
| Purpose | Proposes a price before work starts | Requests payment after work is done |
| Timing | Sent before work begins | Sent after work is completed |
| Binding | Fixed price offer, binding if accepted | Record of payment due, may include late fees |
| Detail level | Scope, pricing, terms, validity period | Line items, payment terms, due date |
| Negotiation | Often negotiated before acceptance | Not usually negotiated — payment expected |
| Legal status | Contractual offer | Demand for payment, record of transaction |
| Format | Proposal-style with terms and acceptance | Bill-style with totals and payment instructions |
Quote
A quote is a fixed price proposal sent to a client before work begins. It specifies the scope of work, itemized pricing, payment terms, and how long the offer is valid.
After discussing the project scope with the client, before starting any work.
- • Scope of work
- • Itemized pricing
- • Validity period
- • Payment terms
- • Acceptance signature
Invoice
An invoice is a payment request sent after work is completed. It lists the services provided, the agreed price, and the payment due date.
After completing the work or reaching a billing milestone.
- • Invoice number
- • Line items with rates
- • Subtotal and tax
- • Payment due date
- • Payment instructions
Real-world example
A web designer quotes $3,600 for a website redesign. The client accepts the quote. After the designer completes the work, they send an invoice for $3,600 with Net 30 terms. The quote established the price; the invoice collects payment.
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Frequently asked questions
Should I send a quote or an invoice first?+
Always send a quote first. The quote establishes the agreed price, scope, and terms. After the work is done, you send an invoice referencing the quote number.
Can a quote become an invoice?+
Not directly. After the client accepts the quote and you complete the work, create a new invoice based on the agreed terms. Never send the quote document as an invoice.
Do I need both a quote and an invoice?+
For professional service work, yes. The quote sets expectations. The invoice formalizes payment. Skipping the quote can lead to scope disputes and late payments.
What happens if the final cost differs from the quote?+
If scope changes, issue a change order or revised quote before the work. If the final cost is lower, invoice the actual amount. Never inflate an invoice beyond the quoted price without client approval.
Are quotes and invoices legally required?+
Quotes are not legally required but are best practice for professional services. Invoices are often required for tax and accounting records, especially for registered businesses.