This article was previously published under Q169381
In Microsoft Project, when you enter a new value in the Actual Cost field, this value may be added to the total Cost.
This behavior occurs if the Actual costs are always calculated by Microsoft Project option is not selected. When this option is not selected, actual costs are added to the total cost. Microsoft Project uses the following formula to determine total cost:
Total Cost = (Remaining Work * Resource Costs) + Fixed Cost + Actual Cost
NOTE: To locate this option in Microsoft Project 2013 or 2010, click Options on the File tab, and then click the Schedule tab. To locate this option in Microsoft Project 2007 and earlier versions, click Options on the Tools menu, and then click the Calculation tab.
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