In the public debate, the additional annual pecuniary benefit for pensioners operates under the term "thirteenth pension". The purpose of the article is to assess the legal nature of this benefit and to answer the question whether it constitutes the implementation of the constitutional right to social security expressed in Article 67 of the Constitution. For this purpose, the

author discusses the provisions of the Act of 9 January 2020 on additional annual pecuniary benefit for pensioners, assessing them through the characteristic features of traditional methods implementing the idea of social security. The analysis leads to the conclusion that the additional annual pecuniary benefit is an instrument of social security, to some extent falling within the scope regulated in Article 67 of the Constitution.