# Estimate vs invoice: what is the difference? By Roy van Oeteren, founder · Updated October 17, 2026 · 6 min read An estimate is an approximate price for work you have not done yet, and the client owes nothing when they receive it. An invoice is a demand for payment for work that is done, and the client owes the amount on it by the due date. A quote is close to an estimate, but firmer: it is a fixed price you commit to. In everyday US speech people use “quote” and “estimate” loosely, so say which one you mean and whether the price can change. ## Estimate vs quote vs invoice | | Estimate | Quote | Invoice | | --- | --- | --- | --- | | What it is | A best guess of the cost | A fixed price offer | A request for payment | | When | Before the work | Before the work | After the work, or at a milestone | | Can the price change? | Yes, if the scope grows | Usually not | No, it states what is owed | | Is the client committed? | No | Yes, once accepted | Yes, to pay | | Has a due date? | An expiry date at most | An expiry date | A payment due date | ## When to send an estimate Send an estimate when you cannot know the final cost yet: a repair where you do not know what you will find, a project with open questions, or hourly work. A good estimate says what it includes, what it does not, and how much it could change. For example, “$4,000 to $5,000, depending on the final number of pages.” Many states require a written estimate for certain trades, such as auto repair and home improvement, and some limit how far the final bill may go above it. This varies, so check your state's rules for your trade. ## When to send a quote Send a quote when the scope is clear and you can name a fixed price. Put an expiry date on it, such as “valid for 30 days”, so you are not held to old prices. Once the client accepts, the price is agreed. If they change what they want afterwards, write an updated quote. A written quote that the client signs protects both of you. They know what they will pay and you know you will be paid for what was agreed. The [free quote generator](https://jiffy-invoice.com/quote-generator) makes a clean one you can save as a PDF. ## When to send an invoice Send an invoice when you have delivered the work, or at the payment milestone you agreed on. For a large job, that often means a deposit invoice at the start, progress invoices along the way, and a final invoice at the end. The invoice should match the accepted quote. If the total differs, add a note saying why, such as extra work the client asked for. Learn the basics in [how to write an invoice](https://jiffy-invoice.com/guides/how-to-write-an-invoice). ## How one document becomes the next A typical flow for a small project: 1. The client asks for a price. You send an estimate or quote with the scope, the price and an expiry date. 2. The client accepts, ideally by signing. You may ask for a deposit now. 3. You do the work. If the scope changes, you send an updated quote first. 4. You send an invoice that refers to the accepted quote, minus any deposit. 5. The client pays. You mark the invoice paid and, if they ask, send a [receipt](https://jiffy-invoice.com/guides/invoice-vs-receipt). **Estimate to invoice: same job, two documents** > ESTIMATE EST-210 (valid until November 30, 2026) > Kitchen backsplash install, about 30 sq ft > Tile and materials: $620 to $780 > Labor, 2 days: $900 > Estimated total: $1,520 to $1,680 > > INVOICE INV-2057 (refers to EST-210) > Tile and materials (receipts attached): $704.12 > Labor, 2 days: $900.00 > Deposit received: -$500.00 > TOTAL DUE: $1,104.12 ## Doing it in one tool Retyping a quote into an invoice is where mistakes slip in. In Jiffy, quotes can be signed on screen by your client without an account, and an accepted quote can be turned into an invoice instead of being typed in again. Quotes and e-signatures are on the free plan, as are three invoices a month; see the [pricing](https://jiffy-invoice.com#pricing) for the paid plans. You can also read about the [estimate app](https://jiffy-invoice.com/estimate-app). ## Send an estimate your client can say yes to. Make a clean estimate or quote in the free quote generator, then turn it into an invoice when the work is done. [Make a free estimate](https://jiffy-invoice.com/quote-generator) ## Questions people ask ### Is an estimate legally binding? Usually not, but it depends on your state and trade. A signed quote is more likely to be binding. Ask a lawyer if a large amount is at stake. ### Can the final invoice be higher than the estimate? Yes, if the scope grew, but explain why and, ideally, get the client's okay before doing the extra work. Some states cap how far a bill may exceed an estimate for certain trades. ### Do I need to charge for an estimate? Most small businesses give estimates free. For complex work, such as detailed design or engineering, it is normal to charge. ### Is a quote the same as a proposal? Not quite. A proposal explains the approach and why you are the right choice, and includes the price. A quote is mainly the price and scope. ## Related guides - [How to write an invoice, step by step](https://jiffy-invoice.com/guides/how-to-write-an-invoice) - [Invoice vs receipt: what is the difference?](https://jiffy-invoice.com/guides/invoice-vs-receipt) - [What is a proforma invoice?](https://jiffy-invoice.com/guides/proforma-invoice) [Invoicing guides](https://jiffy-invoice.com/guides) Source: https://jiffy-invoice.com/guides/invoice-vs-estimate