The purpose of this paper is to validate the use of a modified Theory of Planned Behavior (TPB) for predicting undergraduate student cheating. Specifically, we administered a survey assessing how the TPB relates to cheating along with a measure of moral reasoning (DIT- 2) to 527 undergraduate students across three institutions; and analyzed the data using structural equation modeling. Results confirmed using the modified TPB as a model for predicting student cheating and the importance of understanding how cheating varies for students in different periods of moral reasoning development, namely moral consolidation and moral transition.