A corporation has no earnings in a particular year. The corporation is obligated to pay the interest on all of the following EXCEPT:

Income or adjustment bonds are distinct in that they do not require the corporation to make fixed interest payments during years when it has no earnings. Instead, the interest on these bonds is contingent upon the company generating sufficient earnings. If the corporation does not have earnings in a given year, it is not obligated to make interest payments on income bonds, aligning with the flexibility intended in their structure.

In contrast, convertible subordinated debentures, collateral trust bonds, and equipment trust certificates impose a contractual requirement on the corporation to pay interest regardless of its earnings situation. These debt instruments typically come with fixed commitments that must be honored to avoid default, thus highlighting the unique nature of income bonds.