Decide the discount factor: the percentage that will be deducted from each year’s cash flow. Determining this is central to the whole exercise. A higher discount factor will generate a lower overall valuation. Typically, two things influence the level of the discount factor. The first is the level of business risk. If the risk is high (and the investment is unlikely to meet its projections), the discount factor should also be high. Second, there is often a compromise between the cost of borrowed money (such as 5% interest) and the return expected by the investors (for example, 15%); in this case, the discount factor would be 10%. It may be desirable to select a range of discount factors, providing optimistic, realistic and worst-case scenarios.

Apply the discount factor to the net cash flow for each year of the projection and to the terminal value. The figures resulting from these calculations are the present value contribution of each year’s future cash flow; adding these values provides a total estimate for the value of the investment.