In the United States v. Kansas City Life Insurance Co., 1949, the Supreme Court ruled on a case involving an insurance company's liability for war risk insurance policies issued to World War II servicemen. The U.S government had reinsured these policies with private insurers like Kansas City Life Insurance Company and sought reimbursement for claims paid out to policyholders who died during military service. The main issue was whether the insurer could be held liable if death occurred as a result of war, even though such risks were not explicitly covered in their reinsurance contracts with the government. The court decided in favor of the United States, holding that since Congress intended to provide life insurance benefits without exclusions for deaths resulting from war risks when it enacted legislation authorizing Government reinsurance of commercial life insurance policies issued to servicemen during World War II; therefore, Kansas City Life was liable under its contract reinsuring such a policy despite no explicit provision covering war risks.

In the dissenting opinion for United States v. Kansas City Life Insurance Co., Justice Jackson argued that the majority's decision to uphold a tax on insurance companies' reserves was inconsistent with previous rulings and interpretations of the law. He contended that these reserves, which are required by state law and serve as a safeguard for policyholders, should not be considered taxable income because they do not represent profit or gain for the company. Instead, he viewed them as liabilities since they are obligations owed to policyholders. Furthermore, he criticized the majority's reliance on an analogy between banks and insurance companies in their reasoning, stating that this comparison is flawed due to fundamental differences in how these institutions operate and generate profits.