Indirect costs are costs that are not directly accountable to a cost object (such as a particular project, facility, function or product). Like direct costs, indirect costs may be either fixed or variable. Indirect costs include administration, personnel and security costs. These are those costs which are not directly related to production. Some indirect costs may be overhead, but other overhead costs can be directly attributed to a project and are direct costs.
There are two types of indirect costs. One are the fixed indirect costs, which are unchanged for a particular project or company, like transportation of labor to the working site, building temporary roads, etc. The other are recurring indirect costs, which repeat for a particular company, like maintenance of records or the payment of salaries.