Deep Dive: Interest Coverage Ratio Explained — How to Assess a Company's Ability to Service Its Debt
When a company takes on debt, the first question investors should ask isn't whether it can repay the principal — it's whether it can afford the interest payments. The interest coverage ratio (ICR) answers that question directly by measuring how many times over a company's operating earnings can cover its interest expenses. A ratio above 3x generally signals comfort; below 1x means the company can't even make its interest payments from operations. With the 10-year Treasury yield hovering near 4.02% in late February 2026 and the Federal Reserve's benchmark rate at 3.64%, corporate borrowing costs remain elevated compared to the near-zero era. Companies that loaded up on cheap debt during 2020-2021 now face refinancing at significantly higher rates, making the interest coverage ratio more relevant than it has been in over a decade. This guide breaks down how the ICR works, demonstrates it with real data from Microsoft to Boeing, and explains why this ratio belongs in every investor's fundamental analysis toolkit — especially in the current rate environment where debt sustainability separates the survivors from the casualties.