Our study showed that individuals exposed to nonsexual assaultive trauma with lower fluid intelligence PGS had lower frontal theta ERO power during the cued no‐go condition of the CPT, indicating less efficient neural synchronization during behavioral inhibition. These findings suggest that nonsexual assaultive trauma interacts with polygenic scores for fluid intelligence, resulting in altered neural function in adulthood. The main effect observed for sex suggests female participants have better inhibitory control as compared to men. Future studies should consider trauma type when investigating associations between genetic vulnerability to complex cognitive functions, including response inhibition, via polygenic scores. Understanding how trauma influences cognitive outcomes for individuals with genetic risk can inform early intervention and treatment strategies for individuals at high risk for trauma exposures and altered neural function.