Debt is not a problem until a company cannot pay for it. The interest coverage ratio answers one question quickly: how comfortably does a company's profit cover its interest bill? It is one of the first checks worth running on any stock that carries meaningful debt.
What Is the Interest Coverage Ratio?
Interest coverage compares operating profit with the interest a company owes lenders in the same period. It is also called times interest earned. A higher number means more cushion. A low number means a small drop in profit could leave the company struggling to meet its obligations.
The Formula
Interest coverage ratio = Operating income (EBIT) ÷ Interest expense
Both inputs are on the income statement. Some analysts use EBITDA in the numerator, which gives a higher, more generous figure. See What Is EBITDA for why that choice matters. The examples below use operating income, the stricter version.
Real Companies, Very Different Cushions
Using each company's latest fiscal year income statement:
| Company | Operating income | Interest expense | Coverage |
|---|---|---|---|
| Microsoft (FY2026) | $155.2B | $3.1B | 50.9x |
| Delta Air Lines (2025) | $5.8B | $0.7B | 8.6x |
| Coca-Cola (2025) | $13.8B | $1.7B | 8.3x |
| Verizon (2025) | $29.3B | $6.7B | 4.4x |
| AT&T (2025) | $25.0B | $6.8B | 3.7x |
| Carnival (FY2025) | $4.5B | $1.3B | 3.3x |
Source: company annual income statements via FMP. Ratios are calculated from reported operating income and interest expense.
Two things stand out. Microsoft's profit covers its interest dozens of times over, so debt is barely a factor in its risk. The telecoms and the cruise line sit much closer to the 3x line, so a drop in profit matters more to them.
What Counts as a Good Number?
There is no official threshold, but common rules of thumb are:
- Below 1.0: profit does not cover interest. The company is funding the gap with cash, asset sales, or new debt.
- 1.0 to 1.5: thin. A modest earnings miss could cause trouble.
- 1.5 to 3: acceptable for stable businesses, tight for cyclical ones.
- Above 3: generally comfortable.
Context matters. A utility with predictable revenue can carry a lower ratio than an airline or cruise operator, whose profits swing with fuel prices and demand. Judge the ratio against the industry and against the company's own history.
Limits of the Ratio
- It uses accounting profit, not cash. Pair it with free cash flow to see whether cash actually covers the bill.
- It ignores principal. Interest is only part of what debt costs. A company with large debt maturing soon faces a refinancing question this ratio cannot show. Check the balance sheet and the debt-to-equity ratio.
- It looks backward. Rising rates raise interest expense when debt is refinanced, so the ratio can fall even if operations are steady.
- One year can mislead. Compare several years. A falling trend is a bigger warning than a single low reading.
- Missing interest expense. Some companies report none or net it against interest income, which makes the ratio meaningless. Apple's latest FMP income statement shows zero interest expense, so the ratio is not usable there.
How to Use It When Picking Stocks
- Screen out thin coverage when you want quality, especially in cyclical sectors. It is a common filter for avoiding value traps.
- Watch the trend, not just the level. Coverage that falls for three straight years deserves a closer look.
- Compare within an industry. A 4x telecom and a 4x airline carry different risk.
- Re-check after every earnings report. Operating income changes quarterly, and coverage moves with it.
Setting Alerts Around Debt Risk
Coverage problems usually surface at earnings, when profit and interest expense are both updated.
- Set an earnings date alert so you are not surprised. See Earnings Alerts: Never Miss a Report.
- Add price alerts below your entry or below a key support level on leveraged holdings, so a sharp reaction does not go unnoticed. Steps are in How to Set Stock Price Alerts.
- After each report, recalculate coverage for your highest-debt positions.
The Bottom Line
Interest coverage is a two-line calculation that tells you whether debt is a footnote or a threat. Compute it from the income statement, compare it with peers and with the company's own past, and use alerts to catch the earnings reports that update it.
This article is educational and is not investment advice. Figures come from company filings as reported by FMP and may be restated.
