The U.S. Supreme Court case Weiss, Collector of Internal Revenue v. Stearn (1923) revolved around the issue of tax law and its application to a trust fund established by a deceased individual for his wife's benefit. The court had to decide whether the income from this trust was taxable under federal law or not. The plaintiff, Weiss, argued that it should be taxed as part of the estate while defendant Stearn contended that it should be considered separate from the estate and therefore not subject to taxation. In their decision, the Supreme Court ruled in favor of Stearn stating that since she did not have complete control over how funds were distributed from her husband’s will but only received an annual allowance set by trustees; hence she could not be held liable for paying taxes on these funds as they were technically still part of her late husband's estate rather than her personal income. This ruling clarified aspects related to taxation laws concerning trusts and estates at that time which further helped refine legal understanding about what constitutes 'income' under federal tax laws.

In the dissenting opinion for Weiss v. Stearn, Justice Holmes argued that the majority's interpretation of tax law was incorrect. He believed that the income in question should not be considered a gift and therefore exempt from taxation, but rather as part of an agreement between two parties which would make it taxable income. According to him, when Mr. Stern transferred his property rights to Mrs. Stern with no expectation of repayment or return benefit, this constituted a business transaction rather than a gift because there was an implied understanding between them regarding their mutual financial interests and responsibilities within their marriage relationship.