Calculating the Present Value of Riskless Cash Flows by Richard S. Ruback delves into the fundamental valuation question of discounting riskless after-tax cash flows. The book explores the appropriate method for determining the present value of such cash flows emphasizing the after-tax discount rate. It provides formulas for valuing riskless cash flows in different scenarios and discusses the relationship between the after-tax discount rate approach and the adjusted present value approach. The importance of interest tax shields and after-tax interest rates in accurate valuation is highlighted in this insightful guide.