In the 1940 case of Helvering, Commissioner of Internal Revenue v. Campbell, the U.S. Supreme Court ruled on a tax dispute involving dividends from stock shares in a family corporation. The court had to determine whether these dividends were taxable income or gifts and thus exempt from taxation under Section 115(g) of the Revenue Act of 1934. The Campbells argued that their father transferred his shares to them as gifts with no strings attached, while the IRS claimed they were disguised dividend payments subject to taxes. The Supreme Court sided with the IRS, ruling that despite being labeled as "gifts," these transfers functioned like regular corporate distributions and should be taxed accordingly. They based this decision on several factors: (1) Mr.Campbell retained control over his company after transferring his stocks; (2) he continued receiving substantial financial benefits from it; and (3) there was no significant change in economic relationships within the family business following these transactions. This landmark decision established an important precedent for distinguishing between genuine gifts and disguised compensation or profit distribution schemes aimed at avoiding federal income taxes.

In the dissenting opinion for Helvering v. Campbell, Justice McReynolds disagreed with the majority's interpretation of Section 22(a) of the Revenue Act. He argued that this section should not be interpreted to include in gross income any increase in value of property prior to its realization through a sale or other disposition. According to him, unrealized appreciation does not constitute "income" within the meaning of the Sixteenth Amendment and therefore cannot be taxed under federal law. He also contended that taxing such increases would result in inequitable treatment between taxpayers who hold onto their assets and those who sell them since only realized gains can actually provide funds from which tax could be paid without reducing capital.