Poor medication adherence in patients with a psychosis is associated with relapse. It has been proposed that outcomes might be improved by using financial incentives for treatment adherence (FITA). However, a strong moral intuition against this practice has been found. This paper examines the ethics of FITA. Three arguments are presented, which if accepted would severely restrict or even prohibit the practice. These are based on (1) “incommensurable values”, where FITA denigrates an aspect of “respect for the person”, (2) “exploitation”, (...) where unfair advantage is taken of the patient, and (3) “fairness”, where it is difficult to draw a line between those who should and should not be offered payment. A number of practical impediments are also considered. (shrink)