Lesson Overview
When a company needs money to invest, it typically has two big choices: borrow it (debt) or raise it from owners (equity). Both options can fund the same project, but they create very different outcomes for risk, control, flexibility, and long-term value.
In this lesson, you will learn what debt and equity really represent, how leverage changes the risk profile of a business, and why capital structure is one of the most important long-term decisions a firm makes.
Learning Objectives
- Explain the difference between debt and equity financing.
- Define leverage and describe how it affects risk and returns.
- Identify the main benefits and costs of using debt.
- Explain dilution, control, and why equity can be expensive.
- Understand financial distress risk and why flexibility has value.
- Describe how capital structure interacts with WACC and firm value.
- Recognize common real-world constraints such as covenants and refinancing risk.
Debt and Equity: Two Different Promises
Debt
Debt is a contractual obligation. The firm borrows money and promises fixed payments (interest and principal) on a schedule. If the firm fails to pay, lenders can enforce remedies such as collateral claims, restructuring, or bankruptcy processes.
- Priority claim over equity
- Typically lower required return than equity
- Creates mandatory cash outflows
Equity
Equity is ownership. Equity investors provide capital in exchange for a share of future profits and control rights (often voting). Equity payments are not required the way debt payments are, but equity holders take the first losses if the business underperforms.
- Residual claim (gets paid after everyone else)
- Typically higher required return
- No mandatory payments, but dilution of ownership
Capital Structure Defined
Capital structure is the mix of debt and equity used to finance the firm. It is often expressed as percentages, such as 30 percent debt and 70 percent equity, or via leverage ratios.
Capital structure matters because it changes:
- Risk to investors and the required return they demand
- Financial flexibility during downturns
- Control and dilution for existing owners
- The likelihood and cost of financial distress
Leverage: The Amplifier
Leverage means using borrowed money. Leverage can amplify outcomes:
- When business is strong, leverage can increase returns to equity holders.
- When business is weak, leverage can magnify losses and increase failure risk.
The reason is simple: debt payments do not adjust downward when cash flows fall. Equity absorbs the volatility.
Why Firms Use Debt
- Lower cost Lenders take less risk than shareholders, so debt is usually cheaper.
- Tax benefits Interest expense may be tax-deductible, reducing the effective cost of debt.
- No dilution Borrowing avoids issuing new shares and giving up ownership.
- Discipline Required payments can encourage efficient operations and reduce waste.
Used responsibly, debt can increase value by reducing the weighted average cost of capital and improving capital efficiency.
The Costs of Debt
Debt is not free. It creates obligations, constraints, and potential failure modes:
- Financial distress risk The chance the firm cannot meet obligations.
- Refinancing risk The risk that debt cannot be rolled over on reasonable terms.
- Covenants Contract rules that restrict behavior to protect lenders.
- Reduced flexibility Less ability to invest during downturns or respond to shocks.
- Agency conflicts Incentives can shift toward risk-taking when equity is under pressure.
A key idea: even if bankruptcy is rare, the risk of distress can change decisions today, leading firms to pass on good projects or cut necessary spending.
Financial Distress vs Bankruptcy
Financial distress begins long before a formal bankruptcy process. Distress can look like:
- Missing targets and burning cash reserves
- Renegotiating terms with lenders
- Raising emergency equity at unfavorable prices
- Cutting marketing, maintenance, or hiring just to survive
Bankruptcy is one possible outcome, but distress costs can destroy value even if bankruptcy never happens.
Why Firms Use Equity
- Flexibility No required payments, reducing default risk.
- Capacity Equity can support growth when debt capacity is limited.
- Risk sharing Equity spreads business risk across investors.
- Stronger balance sheet More equity can improve creditworthiness and borrowing terms.
Equity is especially important when cash flows are uncertain or the business needs room to invest and adapt.
The Costs of Equity
- Dilution Issuing equity reduces the ownership percentage of existing owners.
- Higher required return Equity is riskier, so investors demand more.
- Control issues New shareholders may gain voting rights or influence strategy.
- Market timing risk Issuing equity when prices are low can be very expensive for current owners.
How Capital Structure Can Affect WACC
In Lesson 4.4, you learned that WACC is the blended required return of debt and equity. Debt is usually cheaper, so adding some debt can lower WACC. But beyond a point, leverage increases risk, causing both debt and equity investors to demand higher returns.
The practical takeaway is not that there is one perfect ratio for every firm. The takeaway is that financing choices shift risk and required returns, which changes investment decisions and value.
Common Leverage Ratios and What They Mean
- Debt to equity A rough measure of how much borrowing supports the equity base.
- Debt to assets Share of assets financed by debt.
- Net debt Debt minus cash (a clearer view of leverage after cash reserves).
- Interest coverage Ability to pay interest from operating earnings.
Ratios are not good or bad by themselves. They must be interpreted in context: stability of cash flows, industry norms, and access to capital markets.
Covenants: The Rules that Come with Debt
Debt agreements often include covenants to protect lenders. Examples include:
- Limits on additional borrowing
- Minimum interest coverage or leverage thresholds
- Restrictions on dividends or share repurchases
- Collateral requirements
- Reporting and audit obligations
Covenants reduce lender risk, which can lower the interest rate. But they also reduce managerial flexibility.
Real-World Capital Structure Factors
Firms do not choose debt and equity in a vacuum. Real-world drivers include:
- Business stability Predictable cash flows support more debt.
- Asset type Hard assets can be collateral; intangible-heavy firms often rely more on equity.
- Growth opportunities High-growth firms may avoid debt to keep flexibility.
- Interest rate environment Borrowing becomes more or less attractive as rates change.
- Management and owner preferences Control and dilution concerns matter.
- Regulation and industry norms Some sectors operate within leverage constraints.
Mini Example: Debt vs Equity for the Same Project
Imagine a firm wants to invest $10 million in an expansion.
- If it uses mostly debt, it may keep ownership intact and lower WACC, but it must ensure it can service payments in a downturn.
- If it uses more equity, it reduces default risk and preserves flexibility, but existing owners may be diluted and the cost of capital may be higher.
Corporate finance is about choosing the structure that fits the firm’s risk profile and strategic goals, not simply choosing the cheapest option on paper.
Key Terms
- Debt Borrowed capital with contractual repayment obligations.
- Equity Ownership capital with residual claims on cash flows and value.
- Capital structure The mix of debt and equity financing.
- Leverage Use of debt to finance assets and operations.
- Financial distress Difficulty meeting obligations, often leading to value loss.
- Dilution Reduction in ownership percentage when new equity is issued.
- Covenant A restriction in a debt agreement that limits certain actions.
Practice: Check Your Understanding
- Why is equity typically more expensive than debt?
- What is one benefit and one cost of using debt?
- How does leverage amplify outcomes for equity holders?
- What is financial distress, and why can it destroy value even without bankruptcy?
- Why might a fast-growing company prefer equity over debt?
What’s Next?
In Lesson 4.6: Dividends, Buybacks, and Payout Policy, we’ll explore how firms return cash to investors, why payout choices can signal confidence, and when reinvestment is the better option.