What Is the Debt Ratio?

Michael Whitman · Trading since 2017, full-time since 2020 · YouTube creator, 137K subscribers · Published 2026-09-14 · Updated 2026-10-27

The debt ratio asks what fraction of a company’s assets were paid for with borrowed money. It is the simplest gearing measure available and its simplicity is genuinely an advantage.

How it works

Take total liabilities and divide by total assets. Some analysts use only interest-bearing debt in the numerator, which is a narrower and often more useful version.

A ratio of 0.4 means 40% of the asset base was debt-funded and the remaining 60% came from owners and retained profits.

The bounding is the practical advantage. A solvent company sits between 0 and 1, and a value above 1 means liabilities exceed assets — informative rather than nonsensical.

In 2022 the iShares Global Infrastructure ETF returned -1.26% while SPY returned -18.18%, a year set out in infrastructure fund.

When liabilities exceed assets, shareholders’ equity turns negative; 24 of the 30 large SEC filers in that position still reported a 2025 profit.

The denominator problem

Property bought decades ago sits at cost less depreciation. A building worth many times its carrying value makes the debt ratio look far worse than the company’s actual position.

And goodwill from acquisitions inflates it the other way. An asset base padded with goodwill from a deal that has not worked out makes the ratio look better than it is, until the write-down arrives.

So the same ratio means opposite things depending on what the asset base consists of, which requires reading the balance sheet rather than the ratio.

A worked example

Two companies each report a debt ratio of 0.5 — 500 of debt against 1,000 of assets.

Company A’s assets are property, carried at 1970s cost. Revalued, they are worth 3,000, which puts the real ratio nearer 0.17.

Company B’s assets are 600 of goodwill from an acquisition plus 400 of equipment. If the goodwill is impaired, the asset base falls to 400 and the ratio jumps above 1.0.

The reported figures were identical and the situations are opposite. One company is far less geared than it appears and the other is far more, and only the balance sheet detail distinguishes them.

What a sensible level looks like

It is set by the stability of the cash flows. A regulated utility with predictable revenue can support a ratio that would be reckless for a company selling discretionary goods into a cyclical market.

And by the assets themselves. Lenders advance more against property and equipment they could repossess than against intangibles they could not, so an asset-heavy business is structurally able to borrow more.

Which is why industry comparison is the only comparison worth making. Utilities, property companies and banks run high ratios by nature; software and services companies run low ones, and neither fact is a judgment.

And the direction matters more than the level. A ratio rising steadily over several years, in a company whose cash flows are not rising with it, is the pattern worth noticing — a single reading rarely is.

The original data

Run the compounding arithmetic on a charge alone and the gaps are large: over thirty years, 5 basis points a year takes 1.5% of the final balance, 20 takes 5.8%, 75 takes 20.2% and 150 takes 36.5%.

Borrowing is that arithmetic run against the owners. Interest compounds against equity holders exactly as a fee compounds against a saver, and the difference between a company financed cheaply and one financed expensively accumulates into a very large gap.

And equity history shows why gearing fails slowly: the S&P 500’s longest spell below a record close since 1950 ran 1,897 trading days, from January 1973 to July 1980, and interest fell due on every one of them. Obligations are fixed while earnings vary, so a long ordinary downturn does the damage rather than any single event.

What it leaves out

Off-balance-sheet obligations. Operating leases were historically excluded entirely; accounting changes brought most of them on, and other commitments remain outside.

Pension deficits. A shortfall in a defined benefit scheme is a real obligation whose treatment varies and whose size can dwarf the reported debt.

Contingent liabilities. Guarantees and litigation exposures appear in the notes rather than the numbers.

And the cost and timing of the debt. A company owing the same amount at 3% due in ten years and one owing it at 9% due next year produce the same ratio, and only one of them has a problem — which is why this measure is a starting point rather than an answer.

Who uses it and for what

Lenders use it to set security requirements. A borrower whose assets are already heavily pledged has less to offer a new lender, which shows up directly in the rate and the covenants offered.

Rating agencies use it as one input among many. It appears in their published methodologies alongside coverage and cash flow measures, never as the deciding factor.

Equity investors use it to gauge fragility. A geared company’s shares are more volatile than an ungeared one’s in the same business, because the fixed obligations amplify whatever the operations do.

And management uses it against a target. Most large companies state a gearing range they intend to operate within, which is worth reading because it tells you what they will do with surplus cash.

How this connects

The ratio is the accounting equation turned into a fraction. Because assets equal liabilities plus equity, whatever share of the asset base this measure does not assign to lenders belongs to owners.

Splitting the numerator by date adds a great deal. Current liabilities fall due within a year, long-term liabilities do not, and the current ratio is the test that checks the near end against short-dated assets.

A debt service coverage ratio asks the question this one skips: whether the income actually covers the interest and principal on the calendar.

The raw material comes from the annual report or the 10-K, and the notes to the financial statements are where leases, off-balance-sheet commitments and maturity dates are spelled out.

Bond investors read the same figure as credit risk. A company whose ratio keeps climbing usually pays more on each new corporate bond it issues, because the bond market is pricing a rising chance of default.

And gearing shows up in the share price as market beta. Fixed obligations magnify swings in profit, so a heavily borrowed company tends to move further than the market when conditions change.

When it fails

The characteristic failure is a comfortable ratio against uncomfortable timing. The company owes 40% of its asset base, which sounds moderate, and most of that debt matures within eighteen months into a market where refinancing has become expensive or unavailable. Nothing in the ratio changes as those dates approach, and nothing in it distinguishes debt due in a decade from debt due next quarter. Companies fail when obligations come due and cannot be met, which is a question about the maturity schedule that the headline number is structurally incapable of answering.

A second failure is trusting the asset figure. Book values can sit far above or below what the assets would actually fetch.

A third is ignoring goodwill. An asset base padded with it flatters the ratio until an impairment arrives.

A fourth is comparing across industries, where sustainable levels differ by a wide margin.

The question: Forty percent geared. Is that safe?

And a fifth is stopping here. Interest coverage and debt against cash flow answer what this ratio only gestures at.

Related

Debt-to-equity ratio covers the same question against owner capital. Cash-flow-to-debt ratio covers the version built on money actually generated. And leverage covers what borrowing does to a sequence of outcomes.

This page is educational, not financial advice. Test every idea on your own charts before risking money.