In the case of McDonald v. Commissioner of Internal Revenue (1944), the U.S Supreme Court ruled in favor of the Commissioner, upholding that a taxpayer could not deduct from his gross income any amount paid as alimony to a former spouse under an agreement made before March 1, 1954. The petitioner, Mr. McDonald had been making such payments and claimed them as deductions on his tax returns which were disallowed by the IRS leading to this litigation. The court held that these payments did not qualify for deduction under Section 22(k) of the Internal Revenue Code because they were not periodic or recurring but rather represented a fixed sum payable irrespective of death or remarriage conditions specified in section 22(k). This decision clarified how alimony payments should be treated for tax purposes when agreements predate specific legislative provisions.

The dissenting opinion in the case of McDonald v. Commissioner of Internal Revenue argued that the majority's decision was incorrect because it failed to consider relevant tax law principles. The dissent pointed out that under existing tax laws, a taxpayer is allowed to deduct losses incurred during a taxable year from gross income for that same year. However, this principle does not apply when the loss is compensated by insurance or other forms of reimbursement. In this case, McDonald had received compensation for his losses through an insurance policy and therefore should not be able to claim these as deductions on his taxes. Furthermore, even if he were allowed to make such claims, they would need to be offset against any gains made during the same period - something which did not occur here due to miscalculations by both parties involved in preparing McDonald's return.