receipt
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You hand over cash at a shop and the cashier gives you a little slip back. That slip is a receipt — written proof that money was actually paid and received. Where an invoice says 'you owe this', a receipt says 'this has been paid'. They sit on opposite ends of the same transaction: one requests, the other confirms.
A receipt typically shows the date, the amount paid, what it was for, and who received it. For the person who paid, it is evidence the obligation is settled; for the person who received the money, it documents the cash coming in. In bookkeeping a receipt is the source document behind entries that involve actual cash movement — recording cash received reduces a receivable, or recording cash paid reduces a payable.
Receipts matter for trust and for taxes. A business keeps receipts to prove expenses it claims and to reconcile its cash against the bank. A common mix-up is treating 'receipt' and 'invoice' as the same thing because both list amounts; the test is simple — has the money moved yet? If yes, you are looking at a receipt; if it is still owed, it is an invoice.
The client from earlier pays the $2,000 invoice. The studio issues a receipt confirming the payment and records cash up $2,000 and accounts receivable down $2,000 — the invoice requested the money, the receipt confirms it arrived.
A receipt confirms cash that an invoice had only requested.
Receipt and invoice are not interchangeable: an invoice asks for payment, a receipt proves payment was made — the dividing line is whether cash has actually moved.