Variance at Completion (VAC) is a key performance indicator in Earned Value Project Management that shows the difference between the Budget at Completion (BAC) and the Estimate at Completion (EAC): VAC = BAC – EAC. A VAC is calculated at any level from the control account up to the total contract that represents the amount of expected overrun (negative VAC) or underrun (positive VAC). During the project execution before the project is completed, the Forecasting Estimate to Completion (ETC) as the Budget at Completion (BAC) can be used for the Variance at Completion (VAC).

Related Definition in the Project: The EVM (Earned Value Management)