In Rosenman et al., Executors, v. United States (1944), the U.S. Supreme Court ruled on a tax dispute involving estate taxes paid by executors of an estate who later claimed a refund. The executors had made payments to the Internal Revenue Service (IRS) while they contested their tax liability in court but eventually won their case and sought a refund for overpayment. The IRS argued that interest should be calculated from the date of overpayment, not from when it was formally assessed as due by them after litigation ended. The Supreme Court sided with the executors, ruling that payment begins when money is delivered to extinguish an obligation or debt - not at some future point determined by formal assessment procedures. Therefore, any delay caused by legal disputes does not change this fact and cannot extend how long taxpayers must wait before receiving refunds plus interest if they have overpaid. This decision clarified important aspects of federal taxation law regarding timing issues related to payment obligations and potential refunds due following successful taxpayer challenges against IRS assessments.

In the dissenting opinion for Rosenman et al., Executors, v. United States, Justice Robert H. Jackson disagreed with the majority's interpretation of tax law and its application to this case. He argued that when a taxpayer makes an overpayment and requests a refund, it should be considered as an interest-free loan to the government until such time as the refund is made or denied by IRS officials. In his view, taxpayers shouldn't bear financial burdens due to administrative delays in processing refunds; instead they should receive interest from their date of overpayment rather than from when their claim was filed or processed by authorities. This perspective emphasizes fairness towards taxpayers who have already paid more than what they owe.