Corporate Finance Principles
Understanding Capital Structure & Leverage
Key financial principles governing debt financing and solvency risk:
- The Double-Edged Sword of Leverage: Debt amplifies Return on Equity (ROE) in favorable economic conditions, but severely magnifies downside losses when operating earnings decline.
- Interest Tax Shield: Because interest expense is tax-deductible, debt carries a lower cost than equity ($r_d imes (1 - T_c)$), reducing WACC up to the optimal distress boundary.
- Times Interest Earned (TIE) Safety Floor: Rating agencies generally require a minimum 3.0x TIE coverage for investment-grade credit ratings.
- Hamada's Theorem: As financial leverage increases, equity shareholders demand higher returns to compensate for increased bankruptcy probability.
Calculate weighted cost of capital in the WACC Lab.