An income bond is a debt instrument where the issuer only pays interest when it generates sufficient earnings to cover the payment. If earnings fall short, the interest is waived for that period, and missing it does not trigger a default. Principal repayment at maturity remains mandatory regardless of earnings. Because of the conditional income stream, income bonds carry higher yields than conventional bonds from the same issuer.
Income bonds appear most often during corporate restructurings, bankruptcy reorganizations, and situations where an issuer needs to raise capital without a mandatory fixed cash commitment that could force a default in lean years.
On a standard bond, you receive your coupon on schedule or the issuer is in default. On an income bond, the coupon is contingent. The bond indenture specifies exactly what "sufficient earnings" means, and you need to read that definition carefully before investing. Some indentures define it broadly enough that management has discretion over whether to trigger payment, which creates an additional risk that has nothing to do with actual profitability.
Income bonds split into two structures based on what happens to missed interest payments.
Always confirm which structure you are buying before you invest. Non-cumulative income bonds expose you to total income loss during extended earning shortfalls.
American railroad companies relied on income bonds extensively because their revenues fluctuated wildly with crop seasons, weather, and economic cycles. A conventional bond structure would have triggered repeated defaults. Income bonds let the railroad service capital in good years while legally deferring interest in bad ones without going bankrupt.
That same logic applies today in restructurings. A company emerging from Chapter 11 bankruptcy may issue income bonds to replace older debt while giving itself breathing room until operations stabilize.
In a bankruptcy liquidation, income bonds typically sit below senior secured and senior unsecured creditors in the priority queue. You get paid after the senior lenders but before equity holders. This lower priority, combined with the uncertain income stream, is why income bonds carry higher yields than comparable investment-grade corporate bonds from the same company.
Raymond James notes in its fixed income investor education materials that income bonds differ from standard debt in one important way: skipped interest payments do not trigger the default protections that conventional bondholders receive. You carry more risk with fewer legal remedies.
The most important section of any income bond indenture is the definition of the earnings threshold that triggers interest payment. Some definitions are objective, such as a specific percentage of gross revenue. Others give management significant discretion. Broad management discretion creates the risk that payments will be reduced or eliminated for financial engineering reasons, not genuine earnings shortfalls.