In the case of Helvering, Commissioner of Internal Revenue v. Taylor in 1934, the U.S Supreme Court ruled on a tax dispute involving stock market losses. The respondent, Taylor had claimed deductions for losses incurred from sales of stocks and bonds during 1929 to his family members at prices above their fair market value. The Commissioner disallowed these deductions arguing that they were not bona fide transactions as required by law because they were made between family members and at inflated prices. On appeal, the Board of Tax Appeals sided with Taylor but this decision was reversed by the Circuit Court of Appeals which agreed with the Commissioner's interpretation. The Supreme Court affirmed this judgment stating that there must be an objective standard for determining whether a transaction is genuine or not; it cannot solely depend on subjective intent. It held that when dealing with related parties where conditions are different than those in ordinary commercial transactions, extra scrutiny is needed to determine if it’s truly conducted like any other trade or business transaction would be under similar circumstances.

In the dissenting opinion for Helvering v. Taylor, Justice Stone argued that the majority's decision to uphold a tax deficiency against Mr. Taylor was incorrect because it relied on an overly broad interpretation of "income" under federal law. He contended that this expansive definition could potentially allow any increase in wealth to be taxed as income, even if it did not result from labor or capital investment - which he believed were the only legitimate sources of taxable income according to established legal principles and precedents. Furthermore, Justice Stone criticized the majority's reliance on economic substance over form in determining whether certain transactions constituted taxable events; he felt this approach undermined certainty and predictability in tax law by allowing subjective judgments about economic reality to override clear statutory language and formal legal structures.