The Challenge of Challenging Tax Laws as Unconstitutionally Vague

Abstract

ABSTRACT Many laypersons (and CPAs and attorneys, for that matter) argue that federal tax statutes and regulations are complex, ambiguous, and vague. However, successfully challenging tax law as unconstitutionally vague has generally not been a successful strategy for taxpayers. In this article, we discuss the void for vagueness doctrine as it has been developed and applied in other areas of the law and review over 40 federal tax cases litigated over the last 20-plus years, in which taxpayers claim that a provision is unconstitutionally vague. Although taxpayer wins are rare, some tax cases find that a statute can be declared overly vague before clarifying regulations or other administrative guidance are issued. Regardless, vague tax laws run afoul of principles of good tax policy. We also provide suggestions for taxpayers and their advisors, who may argue in the future that a federal tax provision is unconstitutionally vague.