## Trade-off Theory

### Concept

The trade-off theory determines an optimal capital structure by balancing the costs and benefits of debt financing.

### Key Elements

Tax benefits of debt: Interest payments are tax-deductible, reducing the overall cost of debt.
Costs of financial distress: Includes
bankruptcy costs, and
non-bankruptcy costs — e.g. employee turnover, strained supplier relations, and conflicts among stakeholders.

### Optimal Capital Structure

Reached when the marginal benefit of debt (mainly tax savings) equals the marginal cost of financial distress and agency costs.
As debt rises, the marginal benefit declines while the marginal cost rises — defining a single optimal debt level.

### Underlying Principle

Modigliani and Miller (1963) introduced the tax benefit of debt; later work extended this into the optimal capital structure described by the trade-off theory.
According to MM, the attractiveness of debt decreases as the personal tax on interest income rises.
A firm faces financial distress when it cannot meet debt-holders' obligations; continued failure to pay can lead to insolvency.

⚠️ Common exam mistakes

Equating the trade-off theory's optimum with maximum debt — the optimum is where marginal benefit equals marginal cost, not where debt is highest.
Listing only bankruptcy costs and ignoring non-bankruptcy distress costs (employee turnover, supplier strain, stakeholder conflict).
Overlooking that personal tax on interest income reduces debt's attractiveness.

Reference:

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