United States v. Kirby Lumber Co., 284 U.S. 1 (1931)
United States v. Kirby Lumber Co.
Does a corporation realize taxable income when it repurchases and retires its own bonds for less than the amount it received upon issuing those bonds?
Yes. When a taxpayer that issued debt for cash later purchases and retires that same debt for less than the amount originally received, the difference is taxable income because the taxpayer's assets are increased (i.e., liabilities are reduced) without any corresponding outlay, constituting a real accession to wealth. This rule applies absent a contrary statutory exclusion or an overall transaction producing a net loss of the sort recognized in Bowers v. Kerbaugh-Empire Co.
The Supreme Court reversed the Court of Claims and held that Kirby Lumber Co. realized taxable income, in the amount of $137,521.30, when it purchased and retired its bonds for less than the amount it had received upon issuance.
Kirby Lumber is the bedrock of the cancellation of indebtedness doctrine in U.S. tax law. It teaches that a reduction in liabilities without a corresponding decrease in assets represents taxable income because it frees assets for the taxpayer's use—a principle later encapsulated in Internal Revenue Code § 61(a)(12). The case also cabins Kerbaugh-Empire and illustrates the primacy of economic substance in measuring income. For law students, Kirby provides a critical conceptual lens for understanding COD income and sets the stage for studying modern statutory exceptions in § 108 (e.g., insolvency, bankruptcy), the timing and measurement of COD, and the link between financial accounting and taxable income.