What is the definition of an invoice?
For all businesses, the invoice is the foundation of bookkeeping and in every accounting program, the invoice is the most often created document. An invoice is generated whenever goods or services are purchased or sold. A sales invoice informs your consumers of the amount they owe you and the due date for payment.
Invoicing is the most important document in accounting since it allows businesses to receive payment for their goods and services. Both the buyer and the seller rely on invoices.