Learn debt-to-equity and interest coverage

Overview

These two ratios reveal how much a company relies on borrowed money and whether it can safely pay the interest on that debt. They're critical for assessing solvency risk: can this company survive a downturn, or will debt obligations crush it?

Why These Ratios Matter

Key Questions They Answer:

1. D/E Ratio: How agressively is the company using debt to grow?
2. Interest Coverage: If revenue drops, how many quarters can it pay interest before defaulting?

Why you care as an investor:

• High leverage amplifies both gains and losses for equity holders
• A company that can't service debt faces bankruptcy → shareholders get wiped out
• Different industries have different "safe" levels (utilities can handle high D/E; tech startups can't)

Debt-to-Equity Ratio (D/E)

Components:

• Total Debt: All interest-bearing obligations (short-term + long-term debt, bonds, loans). Excludes non-interest liabilities like accounts payable.
• Shareholders' Equity: Assets minus liabilities (book value). From the balance sheet: Total Assets - Total Liabilities.

Deriving the Meaning from First Principles

Start with the Balance Sheet Identity: $\text{Assets} = \text{Liabilities} + \text{Equity}$

Rearrange: $\text{Equity} = \text{Assets} - \text{Liabilities}$

Now, split liabilities into debt (interest-bearing) and other liabilities: $\text{Equity} = \text{Assets} - (\text{Debt} + \text{Other Liabilities})$

The D/E ratio compares debt to equity: $\text{D/E} = \frac{\text{Debt}}{\text{Equity}}$

Why this ratio? Equity represents the owners' claim—what's left after all debts. The ratio tells you: for every $1 the owners have put in (or retained), how many dollars are borrowed from lenders?

Interpretation:

• D/E = 0.5: For every $1 of equity,$0.50 is debt → 33% of capital is debt
• D/E = 1.0: Equal debt and equity → 50% debt
• D/E = 2.0: Twice as much debt as equity → 67% debt

Formula for % Debt: $\text{Debt \%} = \frac{\text{D/E}}{1 + \text{D/E}} \times 100$

Calculation: $\text{D/E} = \frac{200{,}000}{800{,}000} = 0.25$

Why this step? We're comparing the borrowed capital to owned capital.

Interpretation: For every $1 of equity, only$0.25 is debt. This is a low-leverage company—owners fund 80% of assets. Safer in downturns, but slower growth (less capital to deploy).

Debt %: $\frac{0.25}{1.25} = 20\%$

Calculation: $\text{D/E} = \frac{600{,}000}{300{,}000} = 2.0$

Why this step? Same ratio, but now debt is double equity.

Interpretation: For every $1 owners have,$2 is borrowed. High leverage—67% debt. If revenue drops, interest obligations could consume profits. Risky, but if sales boom, equity holders gain disproportionately (they control more assets with less money down).

Debt %: $\frac{2.0}{3.0} = 67\%$

Mistake 2: Ignoring industry norms. D/E = 1.5 is dangerous for a software company but normal for a utility.

• Why it feels right: You want a universal "safe" number.
• The fix: Capital-intensive industries (telecom, utilities) have stable cash flows → can handle high debt. Asset-light businesses (tech) can't afford high interest in downturns.

Mistake 3: Using book equity when it's negative (losses piled up).

• The fix: If equity is negative, D/E is meaningless. Look at Debt/EBITDA or Debt/Assets instead.

Interest Coverage Ratio

Components:

• EBIT (Earnings Before Interest and Taxes): Operating profit. From income statement: Revenue - COGS - Operating Expenses.
• Interest Expense: Annual interest payments on debt. Found in the income statement.

What it measures: How many times over can the company pay its interest bill from operating profit?

Deriving from First Principles

Start with the Income Statement Flow: $\text{Revenue} - \text{COGS} - \text{OpEx} = \text{EBIT}$

After paying interest: $\text{EBIT} - \text{Interest} = \text{EBT (Earnings Before Tax)}$

Interest Coverage answers: If operating profit drops, how much cushion exists before we can't pay interest?

$\text{Interest Coverage} = \frac{\text{EBIT}}{\text{Interest Expense}}$

Why EBIT? Because interest is paid before taxes. We want to see if operations alone cover debt service, independent of tax strategy.

Interpretation:

• Coverage = 1.0: EBIT exactly equals interest → zero margin for error
• Coverage = 5.0: EBIT is 5× interest → company could survive an80% profit drop and still pay interest
• Coverage < 1.0: Not earning enough to pay interest → burning cash or refinancing

Rule of Thumb: Coverage ≥ 2.5 is generally safe; < 1.5 is a red flag.

Calculation: $\text{Interest Coverage} = \frac{500{,}000}{100{,}000} = 5.0$

Why this step? We're testing how many multiples of the interest bill are covered by operations.

Interpretation: EBIT is 5× interest. Even if EBIT drops 60%, the company can still pay interest. Low default risk.

Calculation: $\text{Interest Coverage} = \frac{80{,}000}{75{,}000} = 1.07$

Why this step? Coverage barely above 1—danger zone.

Interpretation: Operating profit just covers interest. A 7% EBIT drop → can't pay interest → potential default. High solvency risk. Investors demand higher returns (or flee).

Mistake 2: Ignoring non-cash charges in EBIT (depreciation).

• Why it matters: A company with huge depreciation might have EBIT = $50M but cash flow =$100M. Use EBITDA/Interest for a cash-based view.
• The fix: For capital-heavy businesses, check both EBIT and EBITDA coverage.

Mistake 3: Treating coverage = 3 as "safe" everywhere.

• The fix: Cyclical industries (autos, steel) need higher coverage (≥ 4) because EBIT swings wildly. Stable industries (utilities) can operate safely at 2-3.

Combining D/E and Interest Coverage

Scenario Matrix:

| D/E | Coverage | Interpretation | |------|-----------------------------------------| | Low | High | Conservative & Safe (underlevered?) | | Low | Low | Weak operations (debt isn't the issue) | | High | High | Aggressive but viable (calculated risk) | | High | Low | Distressed (bankruptcy candidate) |

Example: A utility with D/E = 2.5 and coverage = 4 is fine (stable cash). A restaurant with D/E = 2.5 and coverage = 1.2 is in trouble (cyclical revenue).

Interest Coverage: $\frac{300{,}000}{120{,}000} = 2.5$

Analysis:

• D/E = 1.8: 64% debt—high leverage
• Coverage = 2.5: EBIT covers interest 2.5×—acceptable, but not a huge cushion

Verdict: Manageable if EBIT stays stable. Watch for EBIT trends: if dropping, this becomes risky fast. If EBIT grows, leverage pays off for equity holders.

Industry Context

Always compare to peers, not absolute thresholds.

Active Recall Drills

Now, you borrow $30 from your parents to buy a fancy cart. That's "debt." Your **debt-to-equity ratio** is$30 ÷ $20 = 1.5. For every dollar you and your friend own, you borrowed$1.50.

Each week, your parents charge you $3 interest. You make$15 profit before paying them. Your interest coverage is $15 ÷$3 = 5. You earn5× what you owe in interest—plenty of cushion! But if profit drops to $4, coverage becomes 1.3—tight! One bad week and you can't pay them.

Debt-to-equity = how much you borrowed vs. own. Interest coverage = how easily you can pay the borrowing cost.

Visual: Picture a seesaw: Debt on one side, Equity on the other. A balanced seesaw = D/E = 1. Tilted toward Debt = risky. Interest Coverage is the safety net under the seesaw—how far can it tilt before you fall?

Connections

• Liquidity Ratios – D/E is solvency (long-term); current ratio is liquidity (short-term)
• Return on Equity (ROE) – High D/E amplifies ROE (for better or worse)
• EBIT vs EBITDA – Understand which to use for interest coverage
• DuPont Analysis – Leverage is one leg of ROE breakdown
• Credit Ratings – Agencies use these ratios to set bond ratings
• Bankruptcy Prediction – Altman Z-Score incorporates D/E
• Capital Structure – Optimal mix of debt/equity for a company

Summary Checklist

• Can calculate D/E from a balance sheet
• Can interpret D/E industry context (what's normal for this sector?)
• Can calculate Interest Coverage from an income statement
• Understand why EBIT is used (not Net Income)
• Can spot dangerous combinations (high D/E + low coverage)
• Know when to use EBITDA instead of EBIT for coverage

#flashcards/stock-market

What does Debt-to-Equity Ratio measure? :: How much borrowed capital (debt) a company uses relative to owner capital (equity). Formula: Total Debt ÷ Shareholders' Equity.

Concept Map

Hinglish (regional understanding)