A bill of costs is a legal document that lists all the expenses and costs incurred during a legal proceeding. There are different terms that can be used synonymously with bill of costs. These include statement of costs, cost bill, invoice of costs, and statement of expenses. All of these terms refer to the same legal document that outlines the costs associated with a legal case. For example, a cost bill may be used in the UK while a statement of expenses may be used in Canada. Regardless of the terminology used, a bill of costs is an important document that is used to ensure that all expenses associated with a legal case are properly accounted for.