Quote vs estimate vs invoice
Updated · 2 min read
Three documents, three jobs. Mixing them up can mean disputes over price or awkward conversations when the final bill arrives.
The short version
| Document | What it says | When | Binding? |
|---|---|---|---|
| Estimate | “It will probably cost around this.” | Early, before scope is clear | Usually not |
| Quote | “I will do exactly this for this price.” | Once scope is agreed | Often yes, once accepted |
| Invoice | “Here is what you owe. Please pay by this date.” | After work or delivery | Records a debt |
Estimates
An estimate is an educated guess based on what you know so far. Use it when the scope might change, such as a renovation where you cannot see behind the walls. Say clearly that it is an estimate, and give a range if you can.
Quotes
A quote (or quotation) is a fixed-price offer for a defined piece of work. It should list exactly what is included and excluded, the price, and how long the offer is valid. Once the client accepts it, both sides know where they stand.
Invoices
An invoice is sent once the work is done (or at agreed milestones) and asks for payment. It should reference the quote or contract it is based on and list any agreed extras separately.
Moving from quote to invoice
- Send a quote with a clear scope and an expiry date.
- Get written acceptance, even a reply email.
- Log any changes as change orders with prices.
- Invoice using the same line items as the quote, plus approved changes.
When it is time to bill, open the invoice generator and copy the quote’s line items across. Your client will recognise every line, and there will be nothing to question.