Interest Expense

The cost incurred by an entity for borrowing funds, calculated as the interest rate multiplied by the outstanding principal.

Interest expense is the cost a business incurs to borrow funds. It represents the interest that has accumulated over a specific accounting period on outstanding debt instruments, such as corporate bonds, bank loans, convertible notes, or revolving lines of credit. It is recorded on the income statement, typically below operating income (EBIT), and is subtracted to arrive at pre-tax income. For investors, interest expense is a critical indicator of a company's financial leverage and risk profile. Highly leveraged companies must allocate a significant portion of their operating profits to service their debt. This reduces the net income and cash flow available for reinvestment in the business, research and development, dividend payments, or share buybacks. When evaluating a company, investors often compare interest expense to operating income using metrics like the interest coverage ratio. A rapidly rising interest expense—driven by either taking on more debt or facing higher interest rates on variable-rate debt—can signal financial distress if operating profits are flat or declining. Conversely, a low interest expense relative to earnings suggests a conservative capital structure and greater financial flexibility.

Company A has $100 million in outstanding corporate bonds with an annual interest rate of 5%, and a $50 million bank loan with an annual interest rate of 6%. Its total annual interest expense is calculated as: ($100,000,000 0.05) + ($50,000,000 0.06) = $5,000,000 + $3,000,000 = $8,000,000.