In the context of reducing the carbon footprint, there is a noticeable trend in incorporating additives into cement mortars. An increasing number of payment cards in circulation has been noticed. After a period of 4 years after production, it is a waste that has no use. The research focuses on the impact of addition of dispersed fibers from payment cards on the mechanical properties of cement mortar. Destructive bending and compressive strength tests were carried out. Based on the results, it was concluded that the use of fibers from payment cards in cement mortar in appropriate proportions improves its compressive and bending strength. For the addition of 2.5% fiber relative to the weight of the aggregate, the compressive strength of the cement mortar increased by 2.6% and the tensile strength by 7%. The authors see potential for expanding and continuing research on this composite. In sustainable development, it is important to find uses for waste materials. The use of payment cards in concrete and mortar needs to be looked at more closely.