Indirect costs are costs that are not directly accountable to a cost object (such as a particular project, facility, function or product). 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 some 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 contains activities or costs that are fixed 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 contains activities that repeat for a particular company like maintenance of records or payment of salaries.
Most cost estimates are broken down into direct costs and indirect costs.
Direct costs are directly attributable to the object. In construction, the costs of materials, labor, equipment, etc., and all directly involved efforts or expenses for the cost object are direct costs. In manufacturing or other non-construction industries the portion of operating costs that is directly assignable to a specific product or process is a direct cost. Direct costs are those for activities or services that benefit specific projects, for example salaries for project staff and materials required for a particular project. Because these activities are easily traced to projects, their costs are usually charged to projects on an item-by-item basis.