Invoice vs receipt vs estimate
Four documents that get used interchangeably, and the one confusion that reliably ends in an argument.
The short version
These four documents appear at different moments in the same job, and each answers a different question.
- An estimate says roughly what the work will cost. It is an informed guess and can change.
- A quote says exactly what the work will cost. Once accepted it is normally binding.
- An invoice requests payment for work already done. It creates the obligation to pay.
- A receipt confirms payment was made. It closes the transaction.
The confusion that causes disputes
Almost every billing argument in the trades traces back to a quote and an estimate being treated as the same thing. The customer heard a number and understood it as fixed; the contractor said a number and meant it as approximate.
The way out is to label the document and say what the label means on the document itself. If it is an estimate, write that the final cost may vary and say what would make it vary — hidden damage, unexpected code requirements, material price changes.
If it is a quote, be equally explicit that it is fixed, and list what is excluded. "Quote valid 30 days. Excludes any repair to concealed pipework found once the wall is opened" prevents a week of unpleasant conversation later.
When to send each one
Send an estimate or quote before you start, and get it accepted in writing — an email reply saying "yes, go ahead" is enough and has saved a great many contractors.
Send the invoice as soon as the work is finished. Delay here costs you more than anything else you can control.
Send a receipt when payment arrives. Many trades skip this, which is a small missed opportunity: a receipt is a friendly, non-salesy touch at a moment when the customer is satisfied, and it is a natural place to mention that you also handle other work.
Keeping them straight in your records
Number invoices sequentially and keep quotes in their own series, so the two can never be mistaken for one another in your books.
When a quote becomes a job, carry its reference onto the invoice. If anyone later asks why the bill looks the way it does, you can answer the question with a document instead of a memory.
Invoicify Pro builds a professional invoice from a photo, a typed description or a spreadsheet — free to start, no credit card.
Create an invoice free