Invoice vs Quote: What's the Difference?

The core difference

A quote is sent before any work begins. It tells your client what you expect to charge, so they can decide whether to move forward. An invoice is sent after (or during) the work, requesting actual payment for what was delivered.

When to send a quote

Send a quote whenever a client asks “how much will this cost?” before committing. A good quote includes a scope of work, your price (fixed or estimated), and how long the quote is valid — prices can change, and an open-ended quote can come back to bite you months later.

When to send an invoice

Send an invoice once the work is complete, or at agreed milestones for larger projects. Unlike a quote, an invoice is a request for payment now, with a due date attached.

Can a quote become an invoice?

Yes, and it's common practice. Once a client accepts your quote and the work is done, you convert it into an invoice with the same line items, a payment due date, and your payment details added.

What if the price changes after the quote?

If the scope changes mid-project, it's worth sending an updated quote or getting written confirmation before invoicing a different amount. Invoicing significantly more than a client quoted, without warning, is one of the fastest ways to create a payment dispute.

Ready to send one? Create a free quote or create a free invoice.