In the 1945 case of Lusthaus v. Commissioner of Internal Revenue, the United States Supreme Court addressed a dispute over income tax liability. The petitioner, Mr. Lusthaus, had received payments from his former business partner as part of an agreement to dissolve their partnership and divide its assets. However, he did not report these payments as income on his federal tax return. When audited by the IRS, they determined that these funds were taxable income and assessed additional taxes against him accordingly. Mr. Lusthaus challenged this decision in court arguing that these payments represented a division of capital rather than taxable income since it was derived from dissolving their partnership's assets which should be considered non-taxable returns on investment or capital gains instead. The Supreme Court disagreed with Mr.Lusthaus' argument stating that under existing law at the time (the Revenue Act), such distributions are indeed classified as ordinary income subject to taxation regardless if they resulted from dissolution or termination of a business relationship/partnership unless specifically exempted by statute which wasn't applicable here thus affirming lower courts' rulings upholding IRS's assessment.

In the dissenting opinion for Lusthaus v. Commissioner of Internal Revenue, it was argued that the majority's decision to treat a husband and wife as separate taxable entities in this case contradicted previous rulings where spouses were treated as single economic units. The dissenting justices believed that there should be consistency in how marital property is viewed under tax law, regardless of whether it benefits or harms the taxpayer. They also disagreed with the majority's interpretation of "income" under Section 22(a) of the Revenue Act, arguing that income from jointly-owned property should not be divided equally between co-owners unless they contributed equally to its acquisition. In this particular case, since Mr. Lusthaus had provided all funds used to purchase their joint assets while Mrs. Lusthaus made no financial contribution whatsoever; therefore according to them only he should have been taxed on any income derived from these properties.