Setting the optimal make-whole call premium

With a make-whole call, the call price is calculated as the maximum of the par value and the present value of the bond's remaining payments discounted at the prevailing risk-free rate plus a pre-specified spread known as the make-whole premium. The commonly accepted thumb rule in the investment banking community is to set the make-whole premium at 15% of the at-issue credit spread. Using a standard structural model, we calculate the optimal …