In 2019, the European Commission enacted Directive (EU) 2019/904 to reduce the environmental impact of single-use plastics. Article 8 of the directive states that certain costs incurred in waste management, such as collection and disposal costs of single-use plastics for which there are currently no more sustainable alternatives, must be borne by manufacturers (so-called "extended producer responsibility"). However, there is still uncertainty in most Member States of the European Union regarding the exact procedure for calculating these costs. The aim of this work was to determine, based on Article 8, a methodology for calculating the costs incurred for single-use plastics covered by the extended producer responsibility. For this purpose, the compositions of public waste generated by various collection systems of a selected city (> 100.000 inhabitants) were analyzed and other relevant data of the city were collected. Based on the collected data, a possible calculation methodology for calculating the costs incurred by the extended producer responsibility single-use plastics was developed and proposed. The proposed calculation methodology presents rates in euros per inhabitant per single-use plastic product, listed in Article 8. Based on these rates, cities can determine the costs incurred by the single-use plastic products of the extended producer responsibility. In addition, the results of the waste analysis and the amounts of waste generated in the city were also presented and discussed.