Quote vs Estimate vs Invoice vs Receipt: Which Do You Need?

A quote is a fixed price you offer before the work; an estimate is an approximate price that may change; an invoice asks the client to pay for work or goods already agreed or delivered; and a receipt confirms that payment has been received. In a typical sale they come in that order: quote or estimate → (sometimes a proforma invoice) → invoice → receipt. Using the right document at the right step avoids arguments about price and makes bookkeeping straightforward.

The documents at a glance

Whether a quote is legally binding depends on its wording and your local law. The table describes typical business practice, not legal advice.

Estimate

Use an estimate when you cannot know the final cost yet, for example repairs where the problem is not fully visible, or creative work where the client is still deciding the scope.

A good estimate includes:

• a description of the expected work;
• the approximate price, ideally as a range ("£800–£1,100");
• what could change the price ("if additional damage is found");
• how you will handle changes ("we will confirm before exceeding the upper figure").

Quote

Use a quote when the scope is clear and you are willing to commit to a price.

A good quote includes:

• a quote number and date;
• your details and the client's;
• an itemised list of work or goods, with quantities and prices;
• taxes, if you charge them;
• a validity period ("valid for 30 days"), because your costs may change;
• payment terms and any deposit ("50% deposit on acceptance, balance Net 14");
• what is excluded ("does not include printing costs");
• how to accept (a signature, a reply email, a purchase order).

Our guide to invoice payment terms explains phrases like Net 14 and how to choose them.

Proforma invoice

A proforma invoice looks like an invoice but is marked "Proforma". It is used when a client needs a formal document before paying, for example to get internal approval, to arrange a bank transfer in advance, or for customs on international shipments. It is not normally recorded as a sale in your accounts; you issue a real invoice once the sale takes place.

Invoice

An invoice is the formal request for payment. It is the key document for your bookkeeping and, in many countries, for tax.

It should include:

• the word "Invoice" and a unique, sequential invoice number;
• issue date and due date;
• your business name, address and, where required, tax registration number;
• the client's name and address;
• a description of the goods or services, quantities, prices and totals;
• tax amounts, if applicable;
• payment instructions.

See our full checklist of what to include on an invoice. The Invoice Generator has fields for all of these and calculates totals, tax, discount and balance due automatically.

Never change an invoice after sending it. If something was wrong, issue a credit note (which cancels all or part of an invoice) and a new invoice. Rules on this vary by country, so check with an accountant if you are tax registered.

Receipt

A receipt confirms that money has been received. Shops give them at the till; service businesses often send them when a client pays a deposit or pays in cash.

A receipt should include:

• a receipt number and date;
• who paid, and who received the payment;
• the amount and the payment method (cash, card, bank transfer);
• what the payment was for, and the related invoice number if there is one;
• the remaining balance, if any.

The Receipt & Cash Memo Maker creates receipts and cash memos with tax and discount calculations. Our guide on making a receipt or cash memo covers the details.

Paid invoice vs receipt

Many businesses mark an invoice "PAID" and send it back instead of issuing a separate receipt. That is often acceptable for business clients. Separate receipts are more common for cash sales, deposits and customers who need proof for reimbursement or warranty claims.

A worked example

A photographer is booked for a wedding:

1. Quote, valid 30 days: "Full-day coverage, edited gallery of 400 photos: £1,500. 30% deposit to book the date, balance 14 days before the wedding."
2. Invoice 1 (deposit): £450, due on receipt.
3. Receipt for the £450 deposit, noting a balance of £1,050.
4. Invoice 2 (balance): £1,050, due 14 days before the date.
5. Receipt, or invoice 2 marked "Paid".

Each document has its own number, and each refers back to the original quote.

Keeping records tidy

• Use one numbering sequence per document type (Q-0001, INV-0001, R-0001).
• Save every document as a PDF, named consistently: INV-0042_ClientName_2026-11-21.pdf.
• For each job, keep the quote, invoices, receipts and payment confirmations together, merged into one file with Merge PDF if that is helpful.
• If you email invoices containing personal or bank details, consider protecting the PDF with a password.