How do corporate issuers decide between debt and equity financing, and what's the trade-off?

Capital structure decisions are central to Corporate Issuers at CFA Level I. Three frameworks help explain how companies choose between debt and equity: **1. Modigliani-Miller (M&M) Propositions** - **Without taxes:** Capital structure is irrelevant — the value of the firm doesn't change whether you finance with 100% equity or 50/50 debt-equity. This is the theoretical baseline. - **With taxes:** Debt becomes advantageous because interest payments are tax-deductible. If Thornton Electronics earns $12 million EBIT and faces a 25% tax rate, issuing $40 million in debt at 6% creates an annual interest tax shield of $40M x 6% x 25% = **$600,000** per year. The PV of that perpetual tax shield adds directly to firm value. **2. Trade-Off Theory** Firms balance the tax benefits of debt against the costs of financial distress. As leverage increases: - **Benefit:** Tax shields grow linearly - **Cost:** Probability of bankruptcy rises exponentially The optimal capital structure is where the marginal tax benefit equals the marginal distress cost. For example, Whitfield Pharma might find that a 35% debt-to-capital ratio maximizes firm value — beyond that, credit rating downgrades and covenant restrictions outweigh the tax savings. **3. Pecking Order Theory** Firms prefer financing sources in this order: 1. Internal funds (retained earnings) — cheapest, no information asymmetry 2. Debt — moderate cost, limited dilution signal 3. Equity — last resort, because issuing equity signals management thinks shares are overvalued This explains why profitable companies like Apex Consumer Brands might carry very little debt — they generate enough internal cash flow and don't need external capital. **Practical Decision Framework:** Consider Kepler Logistics, deciding between a $200 million bond issue at 5.5% and a $200 million equity offering: | Factor | Favors Debt | Favors Equity | |---|---|---| | Tax rate | High (25%+) — bigger tax shield | Low or zero — no tax benefit | | Earnings stability | Stable cash flows can service debt | Volatile earnings risk default | | Existing leverage | Low D/E ratio — room to add | Already highly leveraged | | Growth opportunities | Limited — debt discipline is good | High — equity preserves flexibility | | Market conditions | Low interest rates | High stock valuations | | Asset tangibility | High (can collateralize) | Low (intangible-heavy) | **Key Exam Formulas:** - **WACC** = (E/V) x Re + (D/V) x Rd x (1 - t) - **Interest coverage ratio** = EBIT / Interest Expense - If Kepler has EBIT of $58M and interest expense of $11M, coverage = 5.27x (healthy) **Exam Tip:** When a vignette describes a company with stable cash flows, tangible assets, and a low current D/E ratio, the answer almost always favors increasing debt. Conversely, a high-growth tech firm with volatile earnings should lean toward equity. Practice more capital structure scenarios in our CFA Level I question bank.