substantial basis

The Tax Court has the primary function of finding the facts in tax disputes, weighing the evidence, and choosing from among conflicting factual inferences and conclusions those which it considers most reasonable. The Circuit Courts of Appeal have no power to change or add to those findings of fact or to reweigh the evidence. And when the Tax Court's factual inferences and conclusions are determinative of compliance with statutory requirements, the appellate courts are limited to a determination of whether they have any substantial basis in the evidence.