Fixed cost is a term that refers to expenses that do not change with an increase or decrease in the quantity of goods or services produced. There are different synonyms for fixed cost that can be used in business and accounting terminologies. Among the common synonyms are overhead cost or indirect cost, which accounts for the expenses needed to maintain the daily operations of a company such as rent, utilities, salaries, and insurance. Another synonym is sunk cost or historical cost, which refers to expenditures that have already been made and cannot be recovered. Finally, some refer to it as a non-variable cost, signifying its nature of staying the same across different levels of production.