What is the difference between an invoice and a quote?

A quote is usually sent before work begins and explains the proposed scope, price, and terms. An invoice requests payment for work, goods, a deposit, or a completed milestone. A quote asks for approval; an invoice asks for payment.

Is a quote legally binding?

An accepted quote can form part of a binding agreement, depending on its wording and the law where you operate. State whether the price is fixed, how long the quote is valid, and what could change the price. Get local legal advice when the distinction matters.

What is the difference between a quote and an estimate?

A quote normally presents a defined price for a defined scope, while an estimate is an informed approximation that may change. Terminology and legal effect vary by location, so label the document clearly and explain any assumptions.

Can I convert a quote to an invoice?

Yes. After the client approves the quote, use the accepted scope and prices as the starting point for the invoice. Reference the quote number and show any approved changes, deposits, or credits so the final balance is easy to follow.

Should a quote and invoice use the same number?

They should usually have separate document numbers, such as QUO-104 and INV-287, because they are different records. Add the quote number as a reference on the invoice to connect them.

Invoice vs Quote | InvoiceCut

The Short Answer

A quote explains proposed work and pricing, usually before the client approves the job.
An invoice records an amount due and asks the client to pay.

The sequence is often quote, approval, work, invoice, payment. It can also include a deposit invoice before work or progress invoices at agreed milestones.

Quote vs Invoice at a Glance

| | Quote | Invoice | |---|---|---| | Main purpose | Ask the client to approve scope and price | Ask the client to pay an amount due | | Usually sent | Before work begins | After delivery, or when a deposit or milestone is due | | Client action | Accept, reject, or request changes | Pay or raise a billing question | | Key dates | Issue date and validity date | Issue date and payment due date | | Status to track | Draft, sent, accepted, expired, declined | Draft, sent, due, paid, overdue, void | | Accounting role | Pre-sale record | Sales and accounts-receivable record |

What Is a Quote?

A quote is a written offer for a defined job. It should give the client enough detail to decide whether to proceed without guessing what the price covers.

A useful quote normally includes:

your business and client details
a quote number and issue date
a clear scope of work
itemized quantities, rates, and totals
taxes or discounts when relevant
a validity date
assumptions, exclusions, and approval terms
expected deposit or payment schedule

For example, a pest control quote template might separate inspection, treatment, and a follow-up visit. A recruiting quote template might distinguish sourcing, screening, and the placement-fee terms. These details make it easier to discuss scope before either business commits to the work.

Use the quote generator to prepare the document, or read the step-by-step quote guide for a fuller checklist.

What Is an Invoice?

An invoice is a billing document for an amount that is due. It may cover completed work, delivered goods, a deposit, a recurring service period, or an agreed milestone.

A complete invoice normally includes:

your business and client details
a unique invoice number
the issue date and payment due date
specific products or services
quantities, rates, tax, discounts, and the total due
payment instructions
a reference to the accepted quote, contract, or purchase order when available

A personal training invoice template, for example, can show the number of sessions in a package separately from program design. A window cleaning invoice template can separate exterior windows, screens, tracks, and other add-ons.

Open the invoice generator to create one, or review how to write an invoice before sending.

A Practical Quote-to-Invoice Example

Imagine a window cleaner receives a request for a two-story home:

The business inspects the job or confirms the window count.
It sends a quote listing exterior cleaning, screen cleaning, track cleaning, access assumptions, and how long the price is valid.
The client approves the quote in writing.
If required, the business sends a deposit invoice.
The work is completed. Any client-approved extra work is documented.
The final invoice references the quote, repeats the agreed items, shows the deposit as a credit, and states the remaining balance and due date.

The invoice should not quietly replace an approved price with a different one. If scope changes, document the change before billing whenever possible.

Quote, Estimate, Proforma Invoice, or Receipt?

These documents solve different problems:

Estimate: an approximate cost when the final scope or quantity is not yet known.
Quote: a defined offer for a stated scope, price, and validity period.
Proforma invoice: a preliminary document used to communicate expected charges before the final commercial invoice. Read the proforma invoice guide.
Invoice: a request for payment.
Receipt: evidence that payment was received.

Names and legal requirements vary by country and industry. Use a label that matches the document's real purpose, and check local invoicing rules when tax or statutory requirements apply.

When to Use Each Document

Send a quote when:

a client asks what a job will cost
scope and price need approval before scheduling
you need to state assumptions, exclusions, or validity
the job includes optional services the client can choose

Send an invoice when:

a deposit is due under the accepted terms
a project milestone has been reached
goods or services have been delivered
a recurring service period is ready to bill

Before You Send

For a quote, verify the scope, validity date, assumptions, and acceptance process. For an invoice, verify the invoice number, due date, total, payment instructions, and quote or purchase-order reference.

Keep the accepted quote and final invoice together in your records. Matching descriptions and references reduce back-and-forth when the client reviews the bill.