Invoices and Reimbursement

An invoice is the piece of paper people overlook most and get wrong most often. It is at once a legal receipt, the basis of a reimbursement claim, and the starting point of a tax calculation. This chapter begins with what an invoice actually is, works through the differences between the common types, the rules that must be followed when issuing one, how to verify one after it arrives, and what to keep and how to submit it for reimbursement.