To calculate the long-term debt ratio, divide a company’s long-term debt by its total assets. Both figures come straight from the balance sheet. If long-term debt is $500,000 and total assets are $2,000,000, the ratio is 0.25, meaning 25 percent of the asset base is financed by debt maturing beyond twelve months. The math is easy. The judgment calls sit in what you put in the numerator and how you read the result.
The Formula
Long-Term Debt Ratio = Long-Term Debt ÷ Total Assets
Multiply the result by 100 if you want a percentage. Using the numbers above, $500,000 divided by $2,000,000 equals 0.25, or 25 percent. That is the whole calculation. Everything else is making sure the two inputs are the right ones.
What Counts as Long-Term Debt
Long-term debt is any financial obligation that matures in more than twelve months. The usual line items are bonds payable, long-term bank loans, and mortgages tied to real estate or equipment. All of these sit in the noncurrent liabilities section of the balance sheet.
Lease liabilities are the one place people get tripped up. Under the current lease accounting standard, ASC 842, companies recognize operating leases on the balance sheet as right-of-use assets paired with lease liabilities measured at the present value of future payments. Before that standard took effect, operating leases stayed off the balance sheet entirely. The noncurrent portion of a lease liability now belongs in the long-term debt bucket when you calculate the ratio. If you are comparing a company’s ratio across the transition, or comparing two companies that recognize leases differently, the numbers are not directly comparable without an adjustment.
Leave the following out of the numerator:
- Accounts payable, accrued wages, short-term credit lines, and anything else due within a year. These are current liabilities, not long-term debt.
- Deferred tax liabilities. They are classified as noncurrent on the balance sheet but are not debt in the ordinary sense. They reflect timing differences between tax and financial reporting. Most analysts exclude them, though some credit agencies take a broader view.
Where the Numbers Come From
Both inputs live on the balance sheet, sometimes labeled the statement of financial position. Liabilities are split into current and noncurrent sections, and long-term debt sits in the noncurrent block. Total assets appear at the bottom of the asset section and include cash, inventory, equipment, real estate, patents, and other intangibles. As a check, total assets must equal total liabilities plus shareholders’ equity. If those sides do not balance, the data is wrong.
For public companies, the audited financial statements in the annual 10-K filing with the SEC are the most reliable source. For private companies, work from internally prepared statements. Audited statements are the strongest; reviewed or compiled statements from an accountant are the next best thing; raw bookkeeping reports are the weakest. Whatever you use, use the same type each period so your trend line is measuring the company, not the source.
Reading the Result
A higher ratio means a larger share of the company’s assets are financed by long-term borrowing. That creates fixed obligations. Interest and principal have to be paid regardless of how the business performs, and when revenue drops, those payments do not shrink with it. A lower ratio means the company leans more on equity or retained earnings, which lenders read as a bigger repayment cushion.
No single threshold separates safe from dangerous, but rough guideposts help:
- Below 0.30 is generally conservative. The company has meaningful room to borrow more if it needs to.
- Between 0.30 and 0.50 is moderate leverage, common for established companies with steady cash flows.
- Above 0.50 is high leverage. The business needs consistent revenue to service its debt, and cash flow disruption becomes a serious problem quickly.
These ranges are starting points, not verdicts. A ratio of 0.40 might unsettle a technology investor and look ordinary for a utility. Which is why the next step is comparison.
Industry Benchmarks Change the Reading
Capital-intensive industries carry more debt because they need expensive infrastructure, and lenders will finance tangible assets like power plants and pipelines. Asset-light businesses run leaner because their value sits in intellectual property and people, which banks will not accept as collateral on comparable terms.
As of January 2026, data from NYU Stern’s cross-industry analysis shows the spread clearly in book debt-to-capital ratios:
- Power utilities: roughly 63 percent
- General utilities: roughly 58 percent
- Oil and gas distribution: roughly 63 percent
- Software, systems and applications: roughly 34 percent
- Software, entertainment: roughly 16 percent
A power utility at 60 percent is inside its sector’s norms. A software company at the same level is an outlier carrying far more debt than its peers. The first comparison to make with any calculated ratio is against the sector average, not against an abstract number.
The interest rate environment also shapes how the number should be read. The Congressional Budget Office projects the federal funds rate at around 3.4 percent in the fourth quarter of 2026, with rates on 10-year Treasury notes expected to rise gradually through 2036. Companies that locked in low fixed rates during 2020 and 2021 may look comfortable at today’s ratios, but those facing refinancing in the next few years could see their debt service costs climb. A ratio that is manageable at 4 percent interest becomes much more stressful at 6 percent.
A Related Version: Debt-to-Capitalization
A close cousin of the long-term debt ratio divides long-term debt by total capitalization instead of total assets. Total capitalization is long-term debt plus shareholders’ equity, including preferred equity if the company has any.
Debt-to-Capitalization Ratio = Long-Term Debt ÷ (Long-Term Debt + Shareholders’ Equity)
This version isolates how the company’s permanent capital is split between borrowed money and owner investment. It strips out short-term liabilities and operating items. A company with $500,000 in long-term debt and $1,000,000 in shareholders’ equity has a debt-to-capitalization ratio of 0.33, so a third of its permanent capital comes from lenders.
The debt-to-total-assets version captures a broader picture because total assets reflect every funding source, including short-term liabilities. The capitalization version zeroes in on strategic financing choices. Neither is better in absolute terms. They answer slightly different questions, and analysts often look at both.
What the Ratio Misses
The long-term debt ratio is a snapshot, and snapshots have blind spots.
- It ignores short-term debt entirely. A company can have a low long-term debt ratio and still be under immediate liquidity pressure from short-term credit lines and accounts payable. A total debt-to-assets ratio, with all liabilities in the numerator, catches that.
- Book values may not reflect reality. Total assets on the balance sheet are historical cost minus depreciation, not current market value. A company with aging equipment carried at low book value can look more leveraged than one with recently purchased assets even when the underlying economics are similar.
- It says nothing about cash flow. Two companies with identical long-term debt ratios can have very different abilities to service that debt. Pair the ratio with a debt service coverage ratio or interest coverage ratio for a fuller picture.
- Off-balance-sheet obligations do not show up. Guarantees, purchase commitments, and certain structured finance arrangements can create real exposure that never appears in the liabilities section. The footnotes to the financial statements are the only place to catch these.
A single quarter’s ratio is one data point. Read it against the industry, against the company’s own history over several years, and alongside cash flow metrics, and it starts to answer the questions the calculation alone cannot.