PurposeThe purpose of this paper is to examine the impact of self-other rating agreement (SOA) on ethical decisions and behavior.Design/methodology/approachA sample of 169 students (60 women and 109 men) enrolled in a part-time, regional MBA program was divided into three SOA categories: (1) Self-aware, individuals whose self-ratings matched observer ratings, (2) Underraters, those whose self-ratings were lower than observer ratings and (3) Overraters, individuals whose self-ratings were higher than other ratings. Ethical behavior was evaluated with the completion of a managerial in-basket assessment.FindingsThe results revealed that ethical behavior varied by SOA, with underraters exhibiting the highest levels of ethical behavior, followed by self-aware (i.e. accurate) and then overraters. One of the intriguing results is that underraters displayed more ethical behaviors than accurate raters, raising questions about the use of accurate self-assessments as an indicator of personal and professional effectiveness.Originality/valueThe results indicate that organizations should consider SOA in their human resource processes because it has important implications for employee training, selection and promotion. While prior research has examined the effect of SOA on performance, commitment and leadership perceptions, the authors contribute to the literature by examining whether SOA influences actual ethical decisions and actions.