Cost management is the process of planning and controlling the budget of a business. Cost management is a form of management accounting that allows a business to predict impending expenditures to help reduce the chance of going over budget.

Many businesses employ cost management plans for specific projects, as well as for the over-all business model. When applying it to a project, expected costs are calculated while the project is still in the planning period and are approved beforehand. During the project, all expenses are recorded and monitored to make sure they stay in line with the cost management plan. After the project is finished, the predicted costs and actual costs can be compared and analyzed, helping future cost management predictions and budgets.