An invoice is a document used in commerce, particularly in retail. It is made by a person or company who is selling something to a customer (or "buyer"). The invoice is given to the customer as a request for payment. It lists the goods or service provided to the customer, along with the price being charged for each of them.

Once the customer has paid for the goods or services, they may be given a receipt. The receipt is the customer's proof that they have paid for the products. A receipt is not the same thing as an invoice.^[1]

From the seller's point of view, an invoice is called the sales invoice. From the buyer's point of view, an invoice is called the purchase invoice.

Business owners, freelancers, accountants, even seasoned managers mix them up. And honestly, it makes sense. They look similar. They talk about money. They usually show up around the same time. But here’s the thing: the invoice and receipt difference is not just semantic — it’s legal, financial, and sometimes emotional (especially when taxes are involved).^[2]

• The word invoice
• Unique reference number
• Invoice date
• Credit terms
• Tax payments
• Name and contact detail of the seller and buyer
• Tax or company registration details of seller
• Date of transaction
• Purchase order number
• Description of products
• Unit prices of products
• Total amount charged
• Payment terms

• Collective invoice
• Continuation invoice
• Commercial invoice
• Credit memo invoice
• Debit memo invoice
• Electronic invoice
• Evaluated receipt settlement invoice
• Pro forma invoice
• Progress billing invoice
• Self-billing invoice
• Statement invoice
• Timesheet invoice

• EDIFACT
• Open Application Group Integration Specification
• UBL
• ISDOC

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