Of the six criteria Buffett Radar applies to every S&P 500 stock, the debt-to-equity ratio is arguably the most underappreciated. Investors obsess over earnings growth, return on equity, and valuation multiples. Meanwhile, leverage sits quietly on the balance sheet, waiting for the next downturn to reveal which companies were swimming naked all along.
This article explains why debt deserves far more attention than most investors give it, how leverage distorts the metrics you already use to pick stocks, and what practical thresholds separate conservative companies from ticking time bombs.
"I've seen more people fail because of liquor and leverage — leverage being borrowed money. You really don't need leverage in this world much. If you're smart, you're going to make a lot of money without borrowing." — Warren Buffett
That quote captures the essence of Buffett's philosophy on debt. He treats leverage the way a structural engineer treats load-bearing capacity: it is not about what happens under normal conditions, but what happens when conditions become extreme. A building that holds up fine on a calm day but collapses in a storm was never well-built. The same applies to a corporate balance sheet.
Debt amplifies both gains and losses. In an expanding economy, borrowing at 5% and investing at 12% makes management look brilliant. Shareholders see inflated returns. Executives collect bonuses tied to those returns. But the amplification works in both directions. When revenue contracts, interest payments remain fixed. What was a tailwind becomes a headwind, and in severe cases, a force that pushes the company toward insolvency.
Buffett has repeatedly described his preference for companies that generate enough cash internally to fund their own growth. These businesses do not need the capital markets to survive. They are, in his words, "never dependent on the kindness of strangers."
The debt-to-equity ratio is calculated as total liabilities divided by shareholders' equity. It tells you how much of the business is funded by creditors versus how much is funded by the owners themselves.
A D/E ratio of 0.5 means that for every $1 of equity, there is $0.50 of debt. The company's owners hold the majority stake in the capital structure. In contrast, a D/E ratio above 1.0 means the company owes more to creditors than its shareholders have invested. The creditors, in a meaningful sense, own more of the business than the shareholders do.
This distinction matters because equity is patient capital and debt is not. Shareholders cannot demand their money back on a specific date. Bondholders and lenders can. When a company misses a debt payment, it triggers a cascade of consequences — credit downgrades, higher borrowing costs, covenant violations, and in the worst case, bankruptcy proceedings — none of which happen when a company simply reduces its dividend.
Debt does not announce itself in quarterly earnings reports the way a revenue miss or margin compression does. A company can carry excessive leverage for years without any visible consequence, as long as revenues are growing and interest rates are stable. The danger only materialises when one of those conditions changes — and by then, it is often too late for shareholders to react.
Consider two hypothetical companies entering the same recession:
Here is what makes this example insidious: before the recession, Company B looked better on paper. Its ROE was higher. An investor screening only for return on equity would have preferred Company B. The leverage was masking fragility and manufacturing the appearance of superior management.
This is one of the most important concepts in fundamental analysis, and it is widely misunderstood. Return on equity is calculated as net income divided by shareholders' equity. If you reduce the denominator — equity — the ratio mechanically increases, even if the business itself is not generating better results.
A company that aggressively borrows to buy back shares, fund acquisitions, or simply operate is reducing its equity base. The result is an ROE figure that looks impressive but has nothing to do with operational excellence. It is financial engineering, not business quality.
Consider two companies that each earn $100 million in net income:
Company Y's ROE is 2.5 times higher. But Company Y is a leveraged house of cards. If earnings drop by 30%, Company X still earns a respectable 14% ROE. Company Y's interest burden may push it into a loss.
This is precisely why Buffett Radar evaluates both ROE and D/E as separate, independently weighted criteria. A high ROE score only counts if it is achieved with conservative leverage. The system is specifically designed to catch the ROE trap that ensnares investors who look at returns in isolation.
Debt-to-equity norms vary significantly across industries, and any serious analysis must account for this. What constitutes dangerous leverage in one sector is standard practice in another.
Buffett Radar applies a universal scoring threshold but adjusts the weight of the debt criterion relative to the sector context. A utility company is not penalised to the same degree as a software company for the same D/E ratio, because the nature of their capital requirements is fundamentally different.
The regional banking crisis of 2023 provided a real-time demonstration of how leverage turns manageable problems into fatal ones. Silicon Valley Bank, First Republic Bank, and Signature Bank all collapsed within weeks of each other. The common thread was not that they made bad loans or engaged in fraud. The common thread was excessive leverage relative to their deposit base, combined with concentrated interest rate risk.
When depositors lost confidence, the leverage that had amplified returns on the way up accelerated the destruction on the way down. These banks had thin equity cushions. A relatively modest decline in the value of their bond portfolios — driven by rising interest rates — was enough to render them technically insolvent.
Meanwhile, the regional banks that survived the crisis intact were precisely the ones with conservative balance sheets, diversified funding sources, and lower leverage ratios. They were not more clever or more innovative. They were simply less fragile. The crisis did not punish risk-taking — it punished leveraged risk-taking.
Buffett does not merely preach conservative leverage — he practises it at an extraordinary level. Berkshire Hathaway operates with minimal corporate debt and maintains a cash and Treasury bill position exceeding $150 billion. This is not laziness or a failure to find investments. It is a deliberate strategic choice.
Buffett has explicitly stated that he wants Berkshire to be in a position to act when others are forced to sell. During the 2008 financial crisis, while over-leveraged companies were scrambling for survival, Berkshire was deploying capital — investing $5 billion in Goldman Sachs at highly favourable terms that no leveraged competitor could match.
"We never want to count on the kindness of strangers in order to meet tomorrow's obligations. When forced to choose, I will not trade even a night's sleep for the chance of extra profits." — Warren Buffett, 2008 Shareholder Letter
He has passed on countless deals because they would have required leverage to execute. In Buffett's framework, the opportunity cost of saying no to a leveraged deal is always lower than the existential cost of being over-leveraged when the environment turns hostile.
For investors applying this criterion to their own analysis, here are practical thresholds that align with the value investing framework:
Beyond the raw ratio, pay attention to the trend. A company whose D/E has risen from 0.3 to 0.9 over three years is telling you something about management's attitude toward risk. Conversely, a company actively reducing leverage from 1.5 to 0.8 is demonstrating balance sheet discipline that may not yet be reflected in its stock price.
Also check interest coverage — operating income divided by interest expense. A company with a D/E of 1.0 but interest coverage of 10x is in a very different position from one with the same D/E but interest coverage of 3x. The first can comfortably service its debt; the second is one bad quarter away from distress.
