Quotes, Estimates, and Invoices: What's the Difference?

Differentiating Billing Documents

Using the wrong document can confuse clients and delay projects.

Estimate: A rough, non-binding educated guess of costs. It changes as project scope becomes clearer.
Quote: A fixed, binding offer. If the client accepts, you must deliver at that price regardless of overruns.
Invoice: The final bill sent after work is completed or goods are delivered to collect actual payment.