How would I calculate the cost of issuing new bonds?

To calculate the cost of issuing new bonds, you need to consider several factors: the coupon rate (interest the bond will pay), the bond's face value, and the costs associated with the issuance, such as underwriting fees and legal expenses. The total cost can be expressed as the yield to maturity (YTM) if you account for the bond's selling price compared to its face value. Additionally, you can compute the effective interest rate by dividing the total annual interest payments (coupon payments) by the net proceeds from the bond issuance.