Abstract
In Poland, the administration of justice, including in tax matters, is exercised by the provincial administrative court in the first instance, and the Supreme Administrative Court, as an appeal (cassation) court. In this article, its author discusses the repeatedly changing rules of conduct in tax matters before the Supreme Administrative Court during the COVID-19 pandemic (for the period 2020 – July 2021). The almost one-and-a-half-year duration of the pandemic allowed for the formulation of conclusions relating to both the legal solutions and the practice of litigation in tax matters before the Supreme Administrative Court during this period. In the work, the author presents his conclusions based on the judicature of the Supreme Administrative Court and the available statistical data on the completed court hearings and closed sessions, as well as resolved cassation complaints in tax matters.