Ethical maturity is a great concern to all educators, firms, and investors across the globe. This research surveyed 448 citizens, managers and employees in Iran to measure their Personal Business Ethics Scores (PBES) to see if age, education, management experience, and government work experience make a difference in making more ethical decisions. This study contributes to the theory of moral development across the Iranian culture as it is the first known study using this method. The results suggest that education and (...) more years of government work experience make a difference in the moral maturity of respondents. This study confirms that the ethical maturity of respondents is enhanced either through the authoritarian regime or socialization with Islamic values. Kohlberg’s moral development theory regarding ethical maturity is partially supported since those with more years of experience in government and more formal education have higher business ethics scores. Implications are discussed. (shrink)