Article / Updated 03-26-2016
One of the core calculations used in capital budgeting is net present value (NPV). Net present value is calculated using the following equation, which says that you add up all the present values of all future cash inflows, and then subtract the sum of the present value of all future cash outflows:
In other words, you take the present value of all future cash flows, both positive and negative, and then add and subtract as appropriate.