Definition
Income bonds are debt instruments issued by a corporation on which interest payments are made only when the corporation has earned sufficient income to cover them — and, typically, only after interest on prior-ranking obligations (such as senior mortgage bonds) has been satisfied. Unlike conventional bonds, which obligate the issuer to pay interest at fixed intervals regardless of financial condition, income bonds make interest contingent on earnings. Principal repayment remains a fixed obligation at maturity; it is the periodic interest payments that are conditional.
Because interest is not guaranteed, income bonds occupy a hybrid position between ordinary debt and preferred equity. They offer the holder a creditor's position in liquidation while bearing some of the earnings-dependent characteristics of preferred stock.
Common Confusion
Income bonds are sometimes confused with revenue bonds, which are issued by governmental or quasi-governmental entities and repaid from the revenue of a specific project (a toll road, a public utility). The contingency mechanism is superficially similar — payments depend on revenues rather than general taxation — but revenue bonds are instruments of public finance, not corporate debt restructuring. Income bonds also differ from junk bonds or high-yield bonds, which carry unconditional interest obligations but at elevated rates reflecting credit risk. The conditionality in an income bond is structural, not merely a function of issuer creditworthiness.
Recognized Forms
/SUBTYPES
Cumulative income bonds: Unpaid interest accumulates and becomes payable in future years when earnings are sufficient. The obligation is deferred, not extinguished.
Non-cumulative income bonds: Interest not paid in a given period is permanently forgiven. Holders bear full earnings risk for each period independently.
Adjustment bonds: A specific class of income bond issued in the context of corporate reorganization or debt restructuring. The term "adjustment bond" is the more common historical label when income bonds were issued to exchange existing obligations during reorganization proceedings.
Why It Matters in Research
Income bonds appear most frequently in two historical contexts: railroad reorganizations of the late nineteenth and early twentieth centuries, and Depression-era corporate debt restructurings. Researchers working in those periods will encounter "adjustment bonds" and "income bonds" used interchangeably in financial and legal records, as well as in court opinions addressing bondholder priority in reorganization proceedings.
The cumulative versus non-cumulative distinction is legally significant and often contested. Researchers reviewing bond indentures or reorganization plans should not assume conditionality terms are uniform — the specific contract language controls, and courts have divided on how to construe ambiguous indenture provisions regarding accumulated unpaid interest.
Income bonds also arise in tax research. For a period, the IRS treatment of income bond interest (whether deductible as interest or treated as a dividend equivalent) was contested. The structural similarity to preferred stock dividends made income bonds attractive targets for tax-motivated recharacterization arguments. Researchers working on mid-twentieth-century tax law or corporate finance should be alert to this dimension.
In modern practice, income bonds are rare but not obsolete. They occasionally appear in private restructurings, distressed debt transactions, and certain emerging-market sovereign instruments. A researcher encountering the term in a contemporary document should verify whether "income bond" is being used in its technical sense or loosely as a descriptor for any earnings-linked obligation.
Historical Dictionary Support
Bouvier's definition — "Bonds of a corporation the interest of which is payable only when earned and after payment of interest upon prior mortgages" — is accurate but narrow. It captures the core conditionality and the subordination to prior mortgage debt, which was the standard structure in railroad finance. What Bouvier does not address is the cumulative/non-cumulative distinction, the tax treatment controversy, or the reorganization context in which adjustment bonds (a functional synonym) arose. Researchers should treat Bouvier as a starting point that correctly identifies the structural rule but does not resolve the interpretive questions that actually generated litigation.
No divergence between historical sources is presented here — there is only one source — but the Bouvier entry's brevity reflects the term's specialized commercial usage: it was well understood by practitioners in its era without requiring extensive elaboration.
Jurisdictional Note
Income bond obligations are primarily governed by the indenture agreement and applicable state contract law. Federal law becomes relevant in bankruptcy and reorganization contexts (historically under the Bankruptcy Act, now under the Bankruptcy Code) and in SEC disclosure requirements for registered securities. No single state's law controls; the governing law provision of the indenture typically determines which jurisdiction's contract rules apply.