To understand how people vary in their cognitive control engagement, researchers use different laboratory tasks and compare performance on trials that are more versus less control-demanding (e.g., congruency effects). However, previous research has struggled to uncover consistent patterns of correlation across cognitive control tasks, leading to questions about the utility of these tasks and the existence of task-general control. The current study sought to test whether these validity concerns may center on the stimulus-driven nature of congruency effects, rather than the tasks themselves. To overcome this obstacle, we varied task incentives while holding stimulus features constant. We show both theoretically and empirically that the effects of incentives on control allocation correlate across tasks. Together, findings support task-general control processes that operate across different contexts.