Invoice vs Quote - What's the Difference?
A quote comes before the work. An invoice comes after.
Updated March 9, 2026 by invoice.Now.
Quote: A Proposed Price
A quote (also called an estimate or proposal) is a document that outlines the expected cost of a project or service before work begins. It tells the client what you plan to deliver and how much it will cost. The client can accept, negotiate, or decline the quote.
A quote is not a bill. It does not create an obligation to pay. It creates an expectation of price, which may or may not be binding depending on your agreement.
A quote typically includes:
- Your business name and contact details
- Client's name and contact details
- Quote number and date
- Itemized list of proposed services or products
- Estimated total cost
- Validity period (e.g., "This quote is valid for 30 days")
- Terms and conditions
Invoice: A Bill for Completed Work
An invoice is a formal payment request sent after work is completed (or at an agreed milestone). It states what was delivered, the amount claimed, and the deadline for payment. Unlike a quote, an invoice usually reflects work already performed under an underlying agreement.
An invoice typically includes:
- Your business name and contact details
- Client's name and contact details
- Invoice number and date
- Itemized list of delivered services or products
- Total amount due
- Payment terms and due date
- Accepted payment methods
Side-by-Side Comparison
| Quote | Invoice | |
|---|---|---|
| Purpose | Propose a price | Request payment |
| Sent when | Before work starts | After work is done |
| Binding | Depends on the quote terms and acceptance | Depends on the underlying agreement and applicable law |
| Contains due date | No | Yes |
| Contains validity period | Yes | No |
| Client action | Accept or decline | Pay by the due date |
When a Quote Becomes an Invoice
The typical workflow looks like this:
- You send a quote outlining the scope and estimated cost.
- The client reviews and approves the quote.
- You complete the work.
- You send an invoice based on the approved quote.
The invoice amount may differ from the quote if the scope changed during the project. When this happens, note the changes on the invoice and reference the original quote number so the client can compare.
What About Estimates and Proposals?
The terms "quote," "estimate," and "proposal" are often used interchangeably, but there are subtle differences:
- Estimate: A rough approximation of cost. Less formal than a quote. The final price may vary.
- Quote: A more precise price commitment, often valid for a specific time period.
- Proposal: A detailed document that includes scope, timeline, deliverables, and pricing. Common for larger projects.
Regardless of what you call it, the key distinction remains: quotes come before work, invoices come after.
Have more questions? Check the invoicing FAQ. Ready to bill for completed work? Open the invoice editor.
Turn your quote into an invoice