Invoice vs Quote vs Pro Forma vs Receipt: What Is the Difference?

Several business documents look alike but do different jobs. Using the right one avoids confusion and accounting errors.

By the Invoice Faster team at Digimarket Group SIA · Updated 3 November 2026

Quote or estimate

Sent before work starts. It describes the work and the price you propose. A quote is usually a fixed offer valid for a stated period; an estimate is an approximate figure that may change. Neither asks for payment, and neither is recorded as income.

Pro forma invoice

A preliminary document that looks like an invoice but is clearly labelled “Pro forma”. It is used to request a prepayment, to let the client arrange internal approval, or for customs purposes when goods are shipped. It is generally not a tax invoice and should not use your invoice number sequence. Once the sale actually happens, issue a proper invoice.

Invoice

The formal request for payment after (or at the agreed point of) supply. It carries a unique sequential number, the parties’ details, the items, tax where applicable, the total and payment terms. In many countries the invoice is also the key tax document for both seller and buyer. See what to put on an invoice.

Receipt

Confirms that payment has been received. Shops issue receipts at the till; freelancers sometimes send one when a client pays in cash or asks for proof of payment. A receipt references the invoice it settles and the payment date and method.

Credit note

Reduces or cancels an invoice that has already been issued — for example after a refund, a discount agreed later or an error. It has its own number and refers to the original invoice. See credit notes and corrections.

Side-by-side

Treatment varies by country; confirm with your accountant.

Using Invoice Faster for these documents

Invoice Faster is designed for invoices. If you adapt it for a quote or pro forma, make the document title and notes say so clearly and do not use a number from your invoice sequence.