Interest Coverage Ratio: Definition, Formula and How to Read It

The interest coverage ratio measures how many times a company's operating profit covers the interest it owes on its debt for the same period. It is also called the times interest earned ratio. A ratio of 5 means operating profit was five times the interest bill; a ratio below 1 means operating profit did not cover the interest at all. It says nothing directly about repaying the debt itself, only about carrying it.

Read that way, the ratio is a cushion: a coverage of 5 means operating profit could fall by four fifths before it stopped covering the interest, and a coverage of 2 leaves room for a fall of one half.

How to calculate it

Take both numbers from the income statement, for the same period: operating profit (EBIT, earnings before interest and taxes) and interest expense. Annual figures are usual; four quarters added together work too. Aswath Damodaran, who teaches valuation at NYU Stern, writes it as "Interest Coverage Ratio = EBIT / Interest Expenses" and shows a worked case: for the aircraft maker Embraer, an average EBIT of 462.1 over 2001 to 2003 against 2003 interest expenses of 129.70 gives a ratio of 3.56 (Damodaran, valuation course slides). He averaged three years of EBIT because the aircraft business was badly hit by 9/11 and its aftermath, and Embraer reported significant drops in operating income in 2002 and 2003. On his 2004 table, that coverage gave Embraer a synthetic rating of A− and a default spread of 1.00%.

Example: one company, four scenarios

A hypothetical company has an EBIT of $12 million and pays $2.4 million in interest a year. Here is what happens to its ratio when profit falls or rates rise (computed, not a real company):

The ratio is sensitive from both sides. A 40% drop in profit and a 50% rise in interest are each survivable on their own here; together they cut coverage from 5 to 2. That combination is what a company with floating-rate or maturing debt faces when a slowdown meets higher rates. For how the market reads central bank rate decisions, see dovish and hawkish.

How to interpret it

There is no universal good number: what counts as safe depends on the size of the company, its industry and how stable its profit is. One published reference is the table Damodaran keeps linking coverage to a "synthetic" credit rating, built from rated U.S. companies, with data as of January 2026 (Damodaran, Ratings, Interest Coverage Ratios and Default Spread). For large non-financial firms (selected rows):

The spread does not rise in a straight line. Across the seven rows above, it stays under 1% down to coverage of 3, roughly doubles to 1.84% around 2, and jumps to 5.09% and then 8.85% as coverage falls toward 1: the last turns of coverage cost far more than the first ones.

Read against that table, the hypothetical company slides from an A rating at 5.0 to BB at 2.0, and the spread its lenders would ask rises from 0.78% to 1.84%. The table is one analyst's mapping, not an agency rating: Damodaran uses it to estimate borrowing costs, and he publishes a separate set of thresholds for smaller firms, which need higher coverage for the same rating (Damodaran, Estimating a synthetic rating).

Variants and limits

• EBITDA coverage. A variant uses EBITDA, which adds back depreciation and amortization. It gives a higher number: with $3 million of depreciation, the base-year company covers its interest 6.25 times instead of 5.
• One period is a snapshot. A single year can flatter or punish a company, which is why Damodaran averaged Embraer's EBIT over three years.
• Interest is not the whole debt bill. The ratio ignores principal repayments. A company can cover its interest and still struggle to refinance a large maturity.
• Financial companies. Damodaran publishes a separate table for financial service firms, with much lower cut-offs: a ratio above 3 already maps to AAA there. Do not read a bank's coverage against the industrial table.

Why traders watch it

Coverage is a quick screen for balance-sheet risk. When it falls toward 1, the company depends on lenders to keep going, and the shares carry the risk that a restructuring leaves little for shareholders; see what happens if a stock goes to zero. It is a fundamental ratio, read from filings, not a chart signal, and it moves only when new results come out. More balance-sheet and market terms are in trading concepts.