Quote vs invoice: the difference, and the clean workflow

A quote proposes a price before the work; an invoice requests payment after (or as) the work happens. A quote says "here's what it will cost" — the customer hasn't committed, and neither have you. An invoice says "here's what you now owe" — the work is agreed or done, and there's a due date attached. One document opens the deal; the other collects on it.

They often contain nearly identical line items, which is why they get confused — and why the fastest workflow is to write the quote once and convert it into the invoice when the job is approved.

What a quote (or estimate) is for

A quote is your offer: the scope of work, itemized, with prices and a total, valid for a stated period ("valid until Aug 1"). Once the customer accepts it, it becomes the reference point for what you'll charge — which protects both sides when the job grows sideways.

Quote vs estimate, while we're here: in everyday small-business use, a quote reads as a fixed price and an estimate as an informed approximation. For a bathroom regrout you've measured, quote it; for "we'll see when we open the wall," estimate it and say what could change the number. Either way, put it in writing — make a free estimate here, no signup.

A good quote has: your business details, the customer's details, a reference number, the issue date, a validity date (not a due date — nothing is owed yet), itemized scope with prices, tax shown separately, the total, and any assumptions ("price assumes existing wiring is to code").

What an invoice is for

An invoice is the bill. It carries a due date, and it's the document your bookkeeping (and the tax office) treats as the record of income. Send it when the work is done, at agreed milestones, or up front if that's your arrangement.

An invoice has the same bones as the quote — plus the due date, an invoice number in a consistent sequence, and payment instructions. Field-by-field details are in our how to make an invoice guide, or build one directly.

From quote to invoice: the clean workflow

1. Quote the job with itemized scope and a validity date. Get a clear yes — in writing if the number is big.
2. Do the work. If scope changes, update the quote or note the change before doing the extra work; surprise line items are the #1 cause of unpaid invoices.
3. Invoice against the quote — same line items, same prices, plus the due date. If you quoted with our tool, switch the Type from Estimate to Invoice and the document converts in place: same details, new title, due date instead of validity.
4. Get paid, then close the loop with a receipt if the customer wants one — here's when each applies.

Is a quote legally binding?

A quote isn't a contract by itself, but once a customer accepts it and you start the work, it's strong evidence of the agreed price — courts and clients both read it that way. That cuts both ways: don't quote numbers you can't honor, and put your assumptions on the quote itself. If material costs move a lot (common in trades), state how long the price holds — that's exactly what the validity date is for.