What is the difference between an invoice and a quote?

A quote is sent before work begins and states what you will charge for a job. An invoice is sent after the work is done and requests payment. A quote is not a demand for payment; an invoice is.

Is a quote legally binding?

A quote can become legally binding if the client accepts it in writing. An estimate, by contrast, is typically non-binding. Always clarify whether your quote is fixed or subject to change.

What is the difference between a quote and an estimate?

A quote is a fixed price offer — if the client accepts it, you are bound to honour that price. An estimate is an approximate figure that may change based on actual time or materials used.

Can I convert a quote to an invoice?

Yes. Once the client approves the quote and the work is completed, create an invoice for the same amount. Many businesses keep the quote reference number on the invoice to link the two documents.

Invoice vs Quote: What's the Difference? | Invoice Generator Guide

The Short Answer

A quote comes before the work. It tells the client what you will charge.
An invoice comes after the work. It tells the client what they owe.

What Is a Quote?

A quote (also called an estimate or proposal) is a document you send to a prospective client before work begins. It outlines:

The scope of work
The price you will charge
How long the price is valid
Any conditions or assumptions

A quote is an offer. If the client accepts it, you have an agreement and can proceed with the work.

What Is an Invoice?

An invoice is a payment request you send after delivering goods or completing a service. It documents:

What was delivered
How much is owed
When payment is due
How to pay

An invoice creates a legal obligation for the client to pay. It is also an accounting document — both you and your client will record it in your books.

Key Differences at a Glance

| | Quote | Invoice | |---|---|---| | Sent | Before work begins | After work is complete | | Purpose | Price offer | Payment request | | Legally binding | When accepted | Yes | | Payment demanded | No | Yes | | Expires | Yes (usually 30 days) | No (due date instead) |

When to Send Each Document

Send a quote when:

A client asks how much a job will cost
You are competing for a project
The scope is clear enough to price upfront

Send an invoice when:

The work is complete
You have delivered the goods
A deposit or milestone payment is due

Quote to Invoice: The Typical Flow

Client asks for a price
You send a quote
Client accepts the quote
You complete the work
You send an invoice (referencing the original quote number)
Client pays the invoice

InvoiceDen lets you create both quotes and invoices. Use the same template family for both to maintain a consistent brand identity with your clients.