Presurgical psychosocial evaluations are an important component of bariatric care; yet, bariatric programs vary widely in their assessment and interpretation of psychosocial risk. There is a need for validated clinical tools that help to standardize and streamline the assessment of variables relevant to surgical outcomes. The present study contributes to the validation of the Bariatric Interprofessional Psychosocial Assessment of Suitability Scale (BIPASS), a novel presurgical psychosocial evaluation tool, by: (a) examining the psychometric properties and optimal cutoff score, and; (b) examining the ability of the BIPASS tool to predict outcomes 1 and 2 years postsurgery, including weight regain, quality of life, psychiatric symptoms and adherence to postsurgical follow-up appointments. The BIPASS was applied retrospectively to the charts of 179 consecutively referred patients to a metropolitan bariatric surgery programme. Internal consistency for the BIPASS was acceptable, and interrater reliability was excellent. Higher BIPASS scores predicted higher binge eating symptomatology and lower mental health-related quality of life at 1 year postsurgery, and weight regain at 2 years (all P < .01). The BIPASS did not predict adherence to postsurgical follow-up appointments. Findings suggest that the BIPASS can be used to identify patients at increased risk of disordered eating, poor quality of life and weight regain early in the postsurgical course, thereby facilitating patient education and appropriate interventions. © 2020 World Obesity Federation.