Cost of Debt
Corporate bond rates can be obtained from various sources including CapitalIQ, Bloomberg and other aggregators.
For free and reliable historical and current corporate interest rate data, also consider the St. Louis Fed (“FRED”) website: Corporate Bonds | FRED | St. Louis Fed (stlouisfed.org)
FRED data is for US corporates; however, in most cases the data can reasonably be used as a proxy for CAD corporates.