Debt-to-Equity Ratio: When It Works, Misleads, or Breaks

Published: April 20, 2026 · Last updated: July 18, 2026

Philip Morris International’s March 2026 balance sheet produces a debt-to-equity result of about negative 5.60 times when interest-bearing debt is divided by PMI stockholders’ equity. The calculation is correct, but the screen invites the wrong conclusion.

PMI still had substantial borrowings. The negative sign came from a negative book-equity denominator. A stock screener can display that number beside a competitor at 2.5 times, yet the comparison is meaningless: the positive figure describes leverage against a usable equity base, while PMI’s negative figure tells you the denominator has failed.

Before deciding that a company’s D/E is high, low, improving, or dangerous, verify two things: what the data provider put in the numerator and whether book equity is still a stable positive denominator. A false comparison can make you reject a profitable, buyback-heavy company or overlook refinancing risk in a genuinely stressed one.

Check What the Numerator Includes

The debt-to-equity ratio looks like one standardized ratio, but providers do not always calculate the numerator the same way. A capital-structure analysis often focuses on interest-bearing borrowings. Other screens use total liabilities, which also include items such as accounts payable, accrued expenses, taxes payable, and lease liabilities.

Two common leverage calculations that should not be mixed in a peer comparison.

Calculation	Formula	Best Use	Main Limitation
Debt-to-equity	Interest-bearing debt ÷ common shareholders’ equity	Capital structure and financing leverage	Definitions of “debt” can still vary
Liabilities-to-equity	Total liabilities ÷ shareholders’ equity	Broad balance-sheet obligations	Mixes financing debt with operating liabilities

Suppose a company has $2 billion of interest-bearing debt, $3 billion of total liabilities, and $1 billion of equity. The first calculation returns 2.0 times. The second returns 3.0 times. Neither calculation is automatically wrong, but comparing one company’s 2.0 with another company’s 3.0 is useless when the numerators differ.

This is also why the balance sheet matters more than the screen. The SEC’s guide to reading a Form 10-K points investors to the audited financial statements and notes, where the debt lines and equity components can be checked directly.

Check Whether Equity Can Carry the Ratio

The denominator creates the more serious failure. Book equity is the residual accounting claim after liabilities are subtracted from assets. It can shrink because of operating losses, write-downs, accumulated other comprehensive losses, dividends, or share repurchases. As that denominator gets smaller, the ratio can surge even when debt barely changes.

How the same $2 billion debt balance changes as book equity approaches and crosses zero.

Debt	Book Equity	Calculated D/E	Interpretation
$2.0 billion	$1.0 billion	2.0×	Comparable when definitions and sector match
$2.0 billion	$50 million	40.0×	Extremely denominator-sensitive
$2.0 billion	$0	Undefined	Division by zero
$2.0 billion	−$50 million	−40.0×	Negative sign comes from the denominator

A negative D/E therefore does not sit below 2.0 times on a risk ladder. The sign comes from negative book equity; the company’s borrowings have not somehow reversed. Peer ranking should stop at that point.

There is no universal positive-equity cutoff that makes every D/E reliable. A company with a small but positive denominator may already have a wildly unstable ratio. The useful distinction is qualitative:

A practical three-lane reading without an invented universal percentage threshold.

Equity Condition	Can You Use D/E?	What Changes
Positive and reasonably stable	Usually, with peer controls	Compare trend, sector, numerator, and reporting date
Positive but thin or falling quickly	Only with caution	Small equity changes can dominate the ratio
Zero or negative	No normal peer comparison	Replace D/E with coverage, cash flow, liquidity, and maturity analysis

When Peer Comparison Is Valid

D/E can still be useful. The ratio works best as a controlled comparison, not as a universal pass-fail score. Before placing two companies side by side, make sure all five conditions below are true:

1. Both companies have positive book equity.
2. The numerator uses the same debt definition.
3. The companies operate in a comparable sector and business model.
4. The figures come from the same reporting period or similarly recent filings.
5. The accounting treatment is comparable across time.

The fifth condition is easy to miss. FASB’s lease standard, Topic 842, requires lessees to recognize lease assets and lease liabilities for leases covered by the standard. That change improved visibility, but it also means a pre-adoption balance sheet and a post-adoption balance sheet can carry different reported liabilities even when the underlying lease economics did not change in the same proportion. FASB describes the recognition requirement here.

For the same reason, a D/E trend should be reconciled with the company’s filings rather than copied from a chart. If the denominator is changing, the companion return-on-equity analysis deserves the same scrutiny because ROE can also become distorted when book equity is unusually small or negative.

What to Use When D/E Breaks

Once equity is near zero or negative, the analytical question changes. You are no longer asking how much debt sits behind each dollar of book equity. You are asking whether the company can service, refinance, and eventually reduce its obligations.

Replacement metrics for companies with thin or negative book equity.

Metric	Question It Answers	Watch-Out
Interest coverage	How many times operating profit covers interest expense	One strong year can hide cyclicality
Net debt / EBITDA	How large net borrowings are relative to operating earnings	Unusable with negative or heavily adjusted EBITDA
Free cash flow / debt	How much debt could be supported or reduced by recurring cash generation	Working-capital swings and capital spending need context
Debt maturity schedule	When refinancing pressure arrives	A manageable total can still have a dangerous near-term wall
Cash and committed liquidity	How much room the company has before external financing is needed	Restricted cash and covenant limits may reduce access

These measures should be read together. High interest coverage does not erase a concentrated maturity wall. Positive free cash flow does not make every acquisition-funded debt load sensible. The point is to replace a broken denominator with measures tied to payment capacity and timing.

Philip Morris International: A Negative D/E Example

PMI’s Form 10-Q for the quarter ended March 31, 2026 gives a clean example of why a negative D/E needs a second step. The filing reported $51.948 billion of interest-bearing borrowings and a $9.279 billion deficit attributable to PMI stockholders. Dividing those figures produces approximately −5.60 times, or −560%.

Philip Morris International balance-sheet lines as of March 31, 2026, in billions of dollars.

SEC Filing Line	Value	Why It Matters
Short-term borrowings	$5.693B	Interest-bearing debt
Current portion of long-term debt	$2.447B	Interest-bearing debt due sooner
Long-term debt	$43.808B	Longer-dated interest-bearing debt
Total interest-bearing debt	$51.948B	Sum of the three borrowing lines
Total liabilities	$76.213B	Broader than financing debt
PMI stockholders’ deficit	−$9.279B	Negative common-equity denominator
Net earnings, Q1 2026	$2.582B	Shows that negative book equity can coexist with current profitability

The same filing shows $35.538 billion of earnings reinvested in the business, $35.462 billion recorded as the cost of repurchased stock, and $11.788 billion of accumulated other comprehensive losses. Those lines help explain how a mature, profitable company can report a stockholders’ deficit. Debt safety remains a separate question, which is exactly why the negative D/E cannot settle it.

Using total liabilities instead of interest-bearing debt would produce approximately −8.21 times. The larger negative number still does not rank PMI as “safer” or “more dangerous” than a positive-equity peer. It confirms that the denominator has crossed below zero.

Primary source: Philip Morris International Form 10-Q, quarter ended March 31, 2026. Balance-sheet values are reported in millions and converted to billions above.

What Default Research Can and Cannot Tell You

The leverage research supports caution, but it cannot be used to convert a default-probability difference into a stockholder’s annual dollar loss.

Cathcart, Dufour, Rossi, and Varotto analyzed roughly six million firm-year observations across six European countries from 2005 through 2015. The difference in default probability between the top and bottom leverage quartiles was 1.24 percentage points for large firms and 2.87 percentage points for small and medium-sized firms. The authors linked the stronger SME effect to heavier short-term debt exposure and refinancing risk. The accepted paper and abstract are available from the University of Reading.

That 2.87-point result compares corporate default probabilities within the study’s sample. The paper did not estimate investor returns or a recurring portfolio drag. Applying the percentage to a $100,000 stock position as a $2,870 annual loss mixes a firm-level probability estimate with an investor-return calculation the authors never performed.

Beaver’s 1966 study is useful for a narrower lesson. It examined multiple financial ratios using statements from the five years before failure. The paper supports reviewing a set of ratios and their history before a failure event, but it does not establish debt-to-equity alone as a universal five-year forecast. See the original Journal of Accounting Research paper.

Readers who want a broader failure framework can continue with how to assess company bankruptcy risk, where liquidity, cash flow, profitability, and leverage are considered together.

A 10-Minute Debt-to-Equity Check

Use this sequence before accepting a debt-to-equity ratio from a screener:

1. Open the latest 10-Q or 10-K. Use the consolidated balance sheet and debt note.
2. Rebuild the numerator. Decide whether you need interest-bearing debt or total liabilities.
3. Inspect common shareholders’ equity. Note whether it is positive, thin, falling quickly, zero, or negative.
4. Compare only inside the valid lane. Match sector, numerator, reporting date, and accounting basis.
5. Switch metrics when the denominator fails. Review coverage, net debt/EBITDA, free cash flow, liquidity, covenants, and maturities.

For a step-by-step filing walkthrough, use the TheFinSense guide to reading a 10-K. The balance sheet gives the ratio, but the notes explain what the number actually contains.

Debt-to-Equity Ratio: Frequently Asked Questions

Bottom Line: Treat D/E as a Conditional Ratio

The debt-to-equity ratio is a useful comparison only after its inputs pass inspection. First match the numerator. Then confirm that book equity is positive enough to function as a denominator. A result near zero equity is unstable; a result at zero is undefined; a result below zero is negative but no longer ranks leverage in the normal way.

Use D/E for controlled peer comparisons with positive equity. When the denominator becomes thin or negative, stop forcing the ratio to answer a question it cannot answer and move to coverage, cash flow, liquidity, and debt maturities.

AI-assisted editing was used to reorganize and proofread this article. Danny Hwang independently checked the cited SEC filing, academic findings, calculations, and final wording. See the editorial policy.

Update history

• v2.0
  2026-07-18
  MAJOR CORRECTION

  Removed an unsupported 30-year portfolio-loss model, an invalid conversion of a default-probability gap into annual investor loss, and an unsourced universal equity/assets threshold. Rebuilt the article around numerator consistency, denominator validity, and a Q1 2026 SEC filing example.

• v1.0
  2026-04-20
  PUBLISH

  Original publication.

Educational quantitative analysis based on published data. Not investment, tax, or legal advice. Consult a licensed professional before acting on any calculation. About TheFinSense.