This article aims to show the similarity between the arguments developed regarding the Treaty freedoms and the approach to the legal principles proposed by R. Alexy. Treaty freedoms from the Treaty on the functioning of the European Union, developed in the course of the Court’s many years of judicial activity, have a number of similarities to the concept of the principles of law proposed by prof. Robert Alex. This is evidenced by – the position of the principles of law in the legal system, the possibility of grading them, or a separate method of resolving the conflict of two opposing principles of law. The article analyses selected treaty freedoms in relation to tax matters and compares them with theoretical schemas proposed by prof. Robert Alexy.

The article discusses the phenomenon of "tax carousels" in the tax on goods and services, which is a specific abusive practice and is used for VAT refund scam purposes. A discussion on the jurisprudential doctrine of the abuse of law and good faith as offered by the Court of Justice of the European Union is followed by an analysis of the judicial decisions (case-law) issued in this area, which proves that taxable persons involved in value-added tax fraud practice have no right to a tax deduction. Meanwhile, those taxable persons who have fallen victim to tax fraud practices may quote the good faith doctrine and exercise the right to a tax deduction. The judicial decisions of the Court of Justice of the European Union have had a significant impact on the judicial decisions issued by administrative courts in Poland. The Supreme Administrative Court (SAC) tries to define the notion of a "tax carousel" in its decisions, as the notion is quite broad.

The article addresses the issues of the stimulating (intervention) function of the betting and gambling tax. It attempts to answer the question whether the intention of the Polish legislator was to ascribe this function to the betting and gambling tax, and if so, to what extent such assumptions were reflected in the legal provisions and the resulting norms. The first part of the article identifies the basic levels of the performance of the stimulating function of the betting and gambling tax in theoretical terms. The second part presents the functions that were attributed to the lottery monopoly and the taxes that affected the organisation of gambling games in the interwar period and in the Polish People’s Republic. The third part of the article analyses the provisions of the Act on Games and Mutual Wagering as well as the Gambling Law in the context of the extent to which these regulations were expected to have an interventional effect at the drafting and adoption stage.