The purpose of an invoice is to consolidate all of this essential information into a single, summarized document so that customers can easily review the work or goods received and remit payment. Acceptable payment methods (credit card, PayPal, etc.).Terms of payment, including due date and late fees.A subtotal (before sales tax) and a final amount owed by the customer.Line items detailing the goods and services received.Invoice number and account number for easy reference.Issuer’s contact information, including the business name, address.Typically, a simple invoice will include the following: The invoice provides customers with the information necessary to pay the issuer and includes a list of goods and services received from the issuing organization. What is an invoice and what is it used for?Ī business invoice is a request for payment from a business to its customer.