Quote vs Estimate vs Invoice: What's the Difference?
If you're running a service business, you've probably used the words quote, estimate, and invoice interchangeably. Most people do. But they mean different things — and using the wrong one at the wrong time can cost you money or land you in a dispute.
What is an estimate?
An estimate is a rough calculation of what a job might cost. It's not binding. You're saying: "Based on what I know right now, I think this will cost around £X."
When to use an estimate:
- You haven't seen the job site yet
- The scope isn't fully defined
- You need to give a ballpark over the phone
Estimates are useful early in a conversation, but they don't close deals. A client can't "accept" an estimate — it's too vague.
What is a quote?
A quote (sometimes called a quotation) is a fixed-price offer for a defined scope of work. When a client accepts a quote, both sides are agreeing to that price.
When to use a quote:
- You know exactly what the job involves
- You want the client to say yes or no
- You're ready to commit to a price
Quotes are legally binding in most jurisdictions once accepted. That's why it's important to be specific about what's included (and what isn't).
What is an invoice?
An invoice is a request for payment after work has been done (or a deposit before it starts). It's not an offer — it's a bill.
When to use an invoice:
- The job is complete
- You need a deposit before starting
- You're billing for a phase of work
Quick comparison
| Estimate | Quote | Invoice | |
|---|---|---|---|
| When | Before the job | Before the job | After the job |
| Binding? | No | Yes (once accepted) | Yes |
| Price | Approximate | Fixed | Final |
| Purpose | Give a ballpark | Win the job | Get paid |
The mistake most people make
Sending an estimate when you should send a quote. Estimates don't close deals — they start conversations. If you've seen the job and know what it involves, send a quote. Be specific, be clear, and be fast.
The professionals who win the most work are the ones who move from "let me get back to you" to "here's your quote" in the shortest time.
How to generate quotes fast
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