In the 1939 case Helvering v. Clifford, the U.S. Supreme Court ruled on a matter of income tax law involving trusts. The respondent, Mr. Clifford, had transferred securities to a trust for his wife and was both trustee and beneficiary during its five-year term; he retained significant control over the assets within it. The Commissioner of Internal Revenue argued that this arrangement allowed him to avoid paying taxes on dividends from those securities by shifting them into lower brackets through distribution among family members in the trust. The court sided with the Commissioner, ruling that since Mr. Clifford maintained substantial control over management and benefits of these funds despite their transfer into a trust, they should be considered part of his gross income for taxation purposes under Section 22(a) of Revenue Act (now known as Internal Revenue Code). This decision established an important precedent regarding how much control one can retain over assets placed in trusts without being subject to additional taxation.

In the dissenting opinion for Helvering v. Clifford, Justice McReynolds disagreed with the majority's ruling that a short-term trust could be taxed as income to the grantor. He argued that this interpretation was inconsistent with established principles of taxation and property law, which clearly distinguished between ownership and control of assets. According to him, once Mr. Clifford transferred his securities into a trust (even one from which he retained certain benefits), they ceased being his personal property and became part of an independent legal entity - the trust itself - whose tax obligations should not be conflated with those of its creator or beneficiaries. Furthermore, he criticized the court's decision for creating uncertainty in tax law by introducing subjective criteria like "dominion" or "control" over assets instead of relying on objective facts such as legal title transfer.