# Interest Coverage

_Systematic Investing . 2026-07-12 . By Tanmay Kurtkoti. Educational, illustrative, not advice._

A friend told me a company he owns is perfectly safe on its debt. It made a profit last year, he said, so it can clearly pay its loans.

I hear that one a lot. Profit and the ability to actually pay your lender are two different questions, and the gap between them is where a lot of apparently healthy companies come undone.

There is one number that settles it, and it is never on the front page of a results release. Operating profit divided by the interest bill. Times interest earned. How many times over the business earns what it owes the bank.

Take two companies. Same operating profit this year, both firmly in the black. Company A owes 60 of interest on a 300 operating profit, so it covers its interest more than 5 times over. Company B owes 200 on the same 300, covering it just 1.5 times. On the P and L they both look fine.

Now serve up an ordinary bad year and knock 40 percent off operating profit for both. Company A still covers its interest 3 times over. Company B drops to 0.9. Its profit no longer covers the interest at all, and the year flips to a loss. It would take an 80 percent collapse to put A there. B only needed a 33 percent dip.

Same headline profit. One has a cushion. The other has a trapdoor.

Lenders watch this line too. Loan agreements often require coverage to stay above a set level, so a company can breach its covenant before it has missed a single payment.

Read the number under the profit before you trust the profit