This paper seeks to introduce novel concepts on Pythagorean fuzzy soft sets (PFSSs) over UP (BCC)-algebras. Then, we
give three different types of PFSSs over UP (BCC)-algebras and look into their generalization. We also find the results of four
operations over UP (BCC)-algebras performed on two PFSSs: union, restricted union, intersection, and extended intersection.
We also discuss -level subsets of PFSSs over UP (BCC)-algebras as a final step in our inquiry into the relationships between
special subsets of UP (BCC)-algebras and PFSSs.