This study investigated whether adolescents' readiness for non-normative political participation (i.e., readiness to confront social rules for political reasons) was predicted by their interpersonal problems (with parents, teachers, and classmates), low optimism, and political beliefs (political self-efficacy and distrust in public institutions). A structural equation model using two-wave longitudinal data from Czech high school students (N = 768; 54% females; age range at T1 = 14-17, M = 15.97; T2 data collected 1.5 years later) showed that the changes in adolescents' readiness for non-normative participation were predicted by their lower institutional trust. Interpersonal relationships or optimism had no cross-sectional or longitudinal effect on the readiness for non-normative participation. These results suggest that the main source of adolescents' readiness for non-normative political actions lies in their political beliefs, while the effect of adolescents' interpersonal problems is less clear.Adolescence is characterized by the development of political orientation, including attitudes toward political participation (Eckstein, Noack, & Gniewosz, 2012). Political participation can encompass many forms (e.g., Ekman & Amnå, 2012). One line of prior research focused on two specific forms of political participation, normative and non-normative. While normative participation refers to legitimate, socially accepted forms of political expression (e.g., voting), non-normative participation encompasses more radical activities, which include confronting the system, violating social rules, and being potentially violent, such as participating in illegal protests or demonstrations (