The U.S. Supreme Court case Helvering, Commissioner of Internal Revenue v. Bullard, Executor in 1937 revolved around the issue of income tax liability for a trust fund's capital gains. The trustee had discretion to distribute or accumulate the net income and was also authorized to sell any part of the corpus and reinvest proceeds as they saw fit. The question before the court was whether these discretionary powers made potential distributions taxable as income under federal law, even if no actual distribution occurred during that year. In a unanimous decision written by Justice Benjamin Cardozo, it ruled that such undistributed capital gains were not taxable as income until actually distributed or set aside for beneficiaries - regardless of how much power trustees held over them. This ruling clarified an important aspect regarding taxation on trusts: only when funds are distributed do they become subject to taxation.

In the dissenting opinion for Helvering v. Bullard, Justice Stone argued that the majority's interpretation of Section 162 of the Revenue Act was incorrect. He believed that this section should not be interpreted to allow a deduction from gross income for amounts paid as interest on indebtedness incurred or continued to purchase or carry obligations which yield tax-exempt income. Instead, he contended that it only disallows deductions where there is an actual loss resulting from borrowing money to buy such securities and then selling them at a lower price than their cost plus interest charges. According to him, if Congress had intended otherwise, they would have explicitly stated so in clear language within the statute itself rather than leaving it up to judicial interpretation.