Cost of debt incurred by any individual, company, or entity for borrowed funds. A non-operating expense on the income statement, it represents the amount payable on debts such as bonds, convertible debt, loans, or lines of credit. To get the interest expense, multiply the interest rate by the outstanding principal amount of the debt. In income statement, it is the interest yielded during the specified period. Interest expense is tax-deductible for corporations; but for individuals, it varies from one jurisdiction to another, as well as on the loan’s purpose.