Purpose: The aim was to explore experiences of capacity to work in persons working while depressed and anxious in order to identify the essence of the phenomenon capacity to work. Method: Four focus groups were conducted with 17 participants employed within the regular job market. Illness experiences ranged from symptoms to clinical diagnoses. A phenomenological approach was employed. Results: The phenomenon of capacity to work was distinguished by nine constituents related to task, time, context and social interactions. The phenomenon encompassed a lost familiarity with ones ordinary work performance, the use of a working facade and adoption of new time-consuming work practices. Feelings of exposure in interpersonal encounters, disruption of work place order, lost "refueling and a trade-off of between work capacity and leisure-time activities was also identified. The reduced capacity was pointed out as invisible, this invisibility was considered troublesome. Conclusions: A complex and comprehensive concept emerged, not earlier described in work capacity studies. Rehabilitation processes would benefit from deeper knowledge of the individuals capacity to work in order to make efficient adjustments at work. Results can have particular relevance both in clinical and occupational health practice, as well as in the workplaces, in supporting re-entering workers after sickness absence.