The present study develops the debate over whether self-control is a limited resource, by investigating the effects innate theories and perceived control have on self-control tasks following ego-depletion. The present study followed previous research findings, one in particular (Job, Dweck & Walton 2010), to determine what the power in willpower could represent. Participants carried out a stimulus detection task consisting of a depleting condition and non-depleting condition. Following this a Stroop test measured self-control following depletion, and a subsequent self-control task was included to control for individual differences and to test depletion on a physical task. Questionnaires measuring participants innate theories about willpower (Job et al., 2010), locus of control (Duttweiler, 1984) and goal attainment control strategies (Wrosch, Scheier, Miller, Schulz, & Carver, 2003) were included in the study. The present study provides evidence for individual differences in innate theories and perceived self-control moderating ego-depletion.