I sent an estimate, the work ran long, and the client treated the number as a promise. Estimate vs quote vs proposal had felt like vocabulary. It was the argument about who pays for the extra week.
The title on the document is not magic. What you committed to is whatever a reasonable client would think you committed to. Say it in the first lines, or they will choose the reading that costs you.
Estimate vs quote vs proposal, in plain words
An estimate
An estimate is the price you expect, based on what you know today. It is allowed to move when the work was uncertain and you said so. It is not a ceiling you can blow through in silence. If you can already see the whole job, you do not need an estimate. You need a quote. Estimates are for fog: a discovery, a repair, a project where the second half depends on what the first half finds.
A quote
A quote is an offer. You will do this described work for this price. If you were slow, or you guessed your hours badly, that is your cost. If they add work, that is not included, but only if the description was specific enough to show the addition. 'Website updates' is not specific. 'These five pages, from the copy they send by Friday' is specific. I would rather quote a smaller clear job than estimate a large vague one and hope.
A proposal
A proposal is the right document when they need the approach, not only the price. What you will do, in what order, what you need from them, how long it takes, and what it costs. It is how you sell a larger job, or a job where they are comparing people. A proposal can end with a quote they can accept in one reply. It should not end with three optional prices and no recommendation. You are the one who knows the work. Pick a shape.
| Document | What it commits you to | Send it when |
|---|---|---|
| Estimate | A current expectation, with room if you said so | The scope is still partly unknown |
| Quote | The described work for that price | The scope is clear enough to stand behind |
| Proposal | The approach, then a price they can accept | They are choosing the plan, not only the fee |
What happens when the work runs over
On an estimate, you stop when you can see you will pass the number. You tell them the new figure and why, and you wait for a yes before you continue. 'I kept going so I would not lose momentum' is how a helpful person eats the extra week. Momentum is not a payment term.
On a quote, you finish the described work at the quoted price. Running over your own hours is not their bill. A change to the work is a variation: a short note, a price, a yes, then you do it. If you do the extra first and price it after, you have donated it. I write the variation in the same thread as the acceptance, not in a new tool they will not open.
Assumptions are what make the overrun fair. 'Assumes copy arrives by Friday. Assumes one round of revisions. Further rounds are quoted separately.' When the copy arrives three weeks late, or the revisions are a redesign, you are not moving the goal. You are reading the line they already had. Put assumptions on the estimate and on the quote. A proposal without them is a story.
Put an expiry date on it
Prices go stale. Your diary fills. A supplier cost moves. A quote with no end date is a number they can accept in March for work you priced in October. Write a date. 'This quote is valid until 18 November 2026. After that I will reconfirm the price before starting.' Two to four weeks is plenty for most freelance jobs. Shorter if you are booking time that other people want.
An estimate needs the same sentence. Otherwise the estimate hardens. They will say you gave them a price. You will say you gave them a sketch. The date is how you stop that conversation. When the date passes, do not quietly honour the old number out of awkwardness. Send a one line update. Same scope, new price, new date. Or same price, new date, if nothing moved. Either way they have a current document.
The price is not the only term that expires. A deposit, a start date, and the payment term belong on the quote before they accept. Payment terms wording you can paste keeps that from being improvised after the yes. The deposit you ask for belongs in the same document. A quote that is silent on when work starts will be read as 'immediately, and we will pay at the end.'
From an accepted estimate to an invoice
Acceptance is a reply that says yes to a specific document. 'Looks good' on the email that attached quote version 3 is enough if version 3 is the one you both mean. A phone call is not enough unless you write it back the same day and they do not correct you. I treat the written yes as the start of the file, and I do not begin on a vague cheer.
Then you do not retype. Copy the accepted lines onto the invoice. Change the title from quote or estimate to invoice. Give it the next invoice number, not the quote's number. Add the due date. If a deposit was already invoiced, show the full fee, the deposit, and the balance. The scope on the invoice should match the scope they accepted. Retyping is how a line gets softer, or how a price gets 'tidied' and then disputed.
The fields on that invoice are the ordinary ones in how to write an invoice. The only new discipline is that the lines are inherited, not rewritten. If the work changed after acceptance, the invoice includes the variation they agreed, as its own line, not blended into the original so nobody can see it. Blended lines are where the memory of the deal goes to die.
If they accepted an estimate rather than a quote, the invoice still follows the confirmed figure, not the first sketch. Confirm in writing when the number settles. Then bill that confirmation. An invoice that is higher than every number they have seen is not a conversion. It is a new argument with a due date on it.
What to do this week
- Open the last price you sent and label it, in the first lines, as an estimate or a quote. If it is neither, decide before you send the next one.
- Add an expiry date and two assumptions, including what happens if they add work.
- When someone accepts, copy those lines onto the invoice. Do not type them again from memory.
The next overrun is already sitting in a document you can fix today. The title is the easy part. The sentence about what the number means is the part that saves the week.
Frequently asked questions
An estimate is your current expectation of the price, and it can move if you said it was an estimate. A quote is an offer to do the described work for that price. If your own time runs over on a quote, you usually wear it. If the client changes the work, both documents need a new number before you continue. The label only helps if the document says which one it is.
Copy the accepted lines onto an invoice. Change the document title, give it the next invoice number, and add the due date. Do not retype the scope from memory. Subtract any deposit you have already billed. The acceptance email is the moment the lines stopped being a guess. The invoice should match those lines.
Put a date on it, often two to four weeks for ordinary freelance work, shorter if your costs move. After that date the price can change and you should say so in the document. An open ended quote is a number they can wave at you in three months. An estimate needs an end date too, or it hardens into a promise you did not mean.
They will try if the estimate looked like a firm price and you never said it could move. A clearly labelled estimate, with the assumptions written down, is much harder to treat as a ceiling. A lump sum with no assumptions will be treated as a quote whatever you called it. Say what would make the number change, before they accept.
Send a quote when the work is clear and they mostly need a price and a date. Send a proposal when they are choosing how the work should be done, or choosing between people, and the price is only one part of the decision. A proposal can contain a quote at the end. A quote does not need ten pages of approach for a job you have both already described.
A quote says what you will do and what it costs, firmly enough to accept. A proposal explains the approach, the steps, and why you are suggesting them, and then it states the price. Use a proposal for a larger or less defined sale. Use a quote when the conversation has already settled the approach and only the offer is missing.
Stop and tell them before you pass the number, with a revised figure and a reason. Do not keep working and surprise them on the invoice. On a quote, you finish at the quoted price unless they changed the work. A change is a new line, accepted in writing, before you do it. Silence while you overrun is how estimates become arguments.
It becomes something you have to stand behind when the client accepts it and you start, especially if you did not say the number could change. Write the acceptance down. If you need room to revise, say that the estimate is not a fixed price and that you will confirm before exceeding it. Once you have confirmed a figure and they have agreed, treat that figure as the quote.
Keep reading
- Use payment terms wording on the quote so the price is not the only promise.
- Decide the freelance deposit percentage before the quote goes out, not after they say yes.
- Read how to write an invoice once the accepted lines are ready to bill.