
The removal of the possibility of settling accounts with a child by a single parent set forth on January 1, 2022, and which had existed continuously since 1993, aroused numerous controversies and critical assessments by taxpayers and tax advisers. The criticism resulted in the restoration of the removed institution on 1 July 2022 and the simultaneous repeal of the tax relief of PLN 1,500 dedicated to this group of taxpayers in the first half of 2022. During the tax year, the legislator introduced highly significant changes in the provisions regulating the accounting rules for a specific group of taxpayers, i.e., single parents. The author tries to answer two questions. Firstly, does the procedure for introducing legislative changes infringe on the provisions of the Constitution and the tax rules derived from the Constitution of the Republic of Poland? Secondly, do the changes infringe on the subjective rights of the taxpayer?