An invoice and a bill are documents that convey the same information about the amount owing for the sale of goods or services. Still, a company uses an invoice to collect money from its customers, whereas a customer operates a bill to refer to payments they owe suppliers for their goods or services. Although an invoice and an account are nearly identical, different parties often utilize them in the same commercial transaction. In the corporate world, bills and invoices are frequently interchanged. While they are more or less on the same page, several crucial differences set one apart from the other.