The aim of this article is to analyze the institution of a substitute governor's in conjunction with the Anti- Corruption Act. This article refers to the issue of legal regulations concerning the supplementary decree as one of the special instruments of personal supervision exercised by the voivode (a provincial representative of the central government in Poland) over the activities of local government. A supplementary decree may be issued by a voivode in cases where the local government bodies do not take action as prescribed by the law. With such an action the voivode substitutes local government bodies, taking over their competences on the basis of specific legal rules. The legal basis for issuing supplementary decrees are the provisions of the legal acts setting the legal framework for the Polish local government system acts in conjunction with the Anti- Corruption Act. The author bases his discussion on previous of legal writing and case law as well as his own practical experience in the interpretation and application of the Anti-Corruption act. The text partly uses findings of the author presented in other publications concerning the Anti-Corruption Act (Mroczka, 2020, p. 31–64).