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2. Debt Financing: If a company uses debt, it pays interest to lenders. These interest
payments are deducted before calculating taxable income. As a result, the company
pays less tax, leaving more money for shareholders.
This tax advantage makes debt financing more attractive. According to MM, the value of a
leveraged firm (a firm that uses debt) is equal to the value of an unleveraged firm (a firm
with no debt) plus the present value of the tax shield.
Mathematically, it can be expressed as:
Where:
•
= Value of a leveraged firm
•
= Value of an unleveraged firm
•
= Corporate tax rate
• = Amount of debt
This equation shows that the more debt a company takes on, the greater the tax shield, and
therefore, the higher the value of the firm.
MM’s Position on Optimal Capital Structure
Now, let’s connect this to the idea of an optimal capital structure.
• In the no-tax world, MM argued that there is no optimal capital structure because
debt and equity financing are irrelevant to firm value.
• In the world with corporate income tax, MM argued that the optimal capital
structure is achieved when the firm is financed entirely by debt. Why? Because debt
maximizes the tax shield, which maximizes firm value.
So, according to MM’s revised theory, the optimal capital structure is 100% debt financing.
Why This Position is Extreme
While MM’s theory is elegant and mathematically sound, it is also extreme. In practice, no
company finances itself entirely with debt. Why? Because there are real-world problems
that MM’s simplified model ignores:
1. Bankruptcy Risk: Too much debt increases the risk of default. If a company cannot
meet its interest obligations, it may go bankrupt. Bankruptcy brings legal costs, loss
of reputation, and disruption of operations.
2. Financial Distress Costs: Even before bankruptcy, companies with high debt may
face difficulties. Suppliers may hesitate to extend credit, employees may feel
insecure, and customers may lose confidence.