Knowledge about work-related occupational therapy in psychiatric inpatient and day hospital clients is limited. The aim of the study was to explore the desired and achieved productivity status in mental health service users participating in a pre-vocational therapy (PVT) intervention. Outcome variables were productivity status and achievement of desired productivity status at discharge, and change or persistence of productivity status between admission and discharge. This is a short-term prospective study based on observational data from health records (N = 98). At admission, 53.2% of participants named a clear desired productivity status; 46.8% did not. Of the former, 76.9% expressed a desire for employment or education on the regular job market; 28.0% achieved their desired outcome at discharge, whereas 72.0% did not. Overall, 58.5% retained, established or increased productive activities, while 41.5% were not engaged in or had reduced productive activities at discharge. These two groups differed in socio-economic and social-security-related characteristics, treatment-related characteristics and psychiatric diagnosis. Some, but not all kinds of clients in acute psychiatric inpatient and day hospital settings manage to take a first step towards productive activities during the first phase of treatment.