What’s the difference between an estimate, a quote and an invoice?

Estimate

An estimate communicates an expected price based on the information available at the time. It is useful when quantities, site conditions or other variables may still change. State assumptions and explain how changes will be handled.

Quote

Businesses often use “quote” for a more definite offered price tied to a defined scope and validity period. In everyday business use, people sometimes use “estimate” and “quote” interchangeably, so the document's actual wording matters more than its label.

Proposal

A proposal can go further by explaining scope, options, exclusions, payment schedule and why the recommended solution fits the customer. It can include an estimate or quoted price.

Invoice

An invoice comes into play when payment is due. It should clearly identify what is being billed, the amount, due date, prior payments or deposits when relevant, and remaining balance.

Keep the documents connected

A clean workflow carries the same customer, scope and approved price from proposal to job to invoice. That reduces retyping and makes it easier to catch billing mistakes.