This study examines the role of moral reasoning in strengthening the effects of the working relationship and incentive schemes on the likelihood of reporting accounting fraud. This study predicts that higher moral reasoning, or being exposed to incentive schemes, is more likely to cause someone to be a whistleblower. However, individuals with a close working relationship with wrongdoers will exhibit a lower propensity to blow the whistle than those with no close working relationship. Finally, moral reasoning is expected to interact with working relationships and incentive schemes to affect the propensity to blow the whistle. Based on a lab experiment with 147 participants, this study documents that the simple effect of moral reasoning, the working relationship, or an incentive scheme are (marginally) significant. Similarly, the combination of moral reasoning and the working relationship significantly improves the tendency to blow the whistle. However, the combined effects of moral reasoning vs. the working relationship and moral reasoning vs. the working relationship vs. an incentive scheme are not significant. This paper confirms previous studies which found that moral reasoning significantly alters the whistleblowing intention but that the impact of moral reasoning is not robust for incentive schemes and working relationships. Some limitations should be considered, namely the textual scenarios of the experimental design, working experience, and the omission of personal orientation and the personal cost of reporting.