An invoice and a receipt can contain similar information, but they serve different moments in a transaction. An invoice requests payment or records an amount owed. A receipt acknowledges that payment has been received.
What is an invoice?
An invoice is a billing document. It identifies the seller and customer, describes what was supplied, shows the amount due and usually sets out when and how the customer should pay. It can therefore exist before any money has changed hands.
What is a receipt?
A receipt is evidence that a payment has been made. It usually records the amount paid, date, seller, and sometimes the payment method or items purchased. A receipt is not normally used to ask the customer to pay an outstanding balance.
Simple example
2 August: consultant sends invoice INV-1042 for £600, due 16 August.
10 August: customer pays £600.
10 August: consultant can issue or record a receipt/payment confirmation.
Can a paid invoice act as proof of payment?
A copy of an invoice marked “paid” can be useful evidence in many business workflows, but do not assume it satisfies every formal requirement that might apply to a receipt, VAT record or accounting system. Keep a payment trail that connects the invoice to the actual transaction.
Why the distinction matters
If you send a document labelled “receipt” before the customer has paid, you may create confusion about whether money is still owed. Conversely, if a customer needs evidence that payment was received, resending an unpaid-style invoice may not answer their question.
Use consistent statuses
A simple invoice system can use statuses such as draft, sent, overdue and paid. Once payment arrives, record the payment date and keep the original invoice number so the history remains easy to audit.
GOV.UK notes that an invoice is not the same as a receipt, which is an acknowledgement of payment. Official reference: GOV.UK – invoicing and taking payment.