https://zpbas.sejm.gov.pl/Journal.nsf/pubBAS.xsp?documentId=818A4D6774F26E01C1258C520048E86E&lang=PL

The Constitution of the Republic of Poland and the Act on the Exercise of the Mandate of a Deputy or Senator do not formulate a general prohibition of combining a mandate with the exercise of functions in self-governing economic organs, commercial companies, cooperatives or non-governmental organisations. Therefore, as a rule, a Deputy may exercise functions in the organs of a legal person. However, the provisions of the Act formulate prohibitions addressed to Deputies concerning their participation in business activities. In the analysed case of the possibility of holding the position of president of the board of an audit association, such a collision may occur, as the Deputy’s participation in the work of the Sejm regarding regulations concerning the rules for the conduct of business activity, which would be addressed to the members of the audit association, may be questionable.