In the KNETSCH et ux. v. UNITED STATES case of 1960, Karl Knetsch and his wife challenged a decision by the Internal Revenue Service (IRS) that denied them certain tax benefits related to an annuity transaction they had entered into with an insurance company. The Supreme Court ruled in favor of the IRS, stating that there was no genuine indebtedness involved in this transaction because it lacked economic substance beyond creating tax deductions. Therefore, interest paid on such transactions could not be deducted from taxable income under Section 23(b) of the Internal Revenue Code as claimed by Mr. Knetsch. The court held that for a taxpayer to claim interest deductions, there must be both a valid obligation to pay at some future date and also true indebtedness which is determined based on whether or not there's any realistic possibility that borrowed funds will actually be repaid out of anything other than anticipated tax savings. This ruling set precedent for future cases involving similar "tax-avoidance" schemes where taxpayers attempt to create artificial debt solely for obtaining tax benefits without any real economic activity or purpose behind their financial transactions.

In the dissenting opinion for KNETSCH et ux. v. UNITED STATES, Justice Whittaker argued that the majority's decision failed to consider the taxpayer's legitimate expectation of profit from his investment in annuity contracts. He contended that there was a real economic substance and business purpose behind Mr. Knetsch’s transactions beyond merely obtaining tax deductions, as he had an actual chance to make a substantial profit if interest rates rose significantly during any year of his contract term with Sam Houston Life Insurance Co., which would have resulted in him receiving more than what he paid for those contracts plus interest on borrowed funds used to purchase them. Therefore, according to Justice Whittaker, these transactions should not be dismissed as shams or devoid of economic reality simply because they also offered potential tax benefits.