Objectives: Using baseline and second wave data, the study evaluated the measurement and structural properties of parenting stress, personal mastery, and economic strain with N = 381 lower income parents who decided to join and those who did not join in a child development savings account program. Methods: Structural equation modeling mean and covariance structures was performed across groups and occasion was performed. Results: Measurement invariance was established across groups and across occasions. However, parenting stress differed across occasions. Conclusions: SEM methods are useful in testing theories as well as comparing manifest and latent structures of constructs across groups and occasions.