Defined as “the formal and informal policies and practices that employers use to encourage and help employees volunteer in community service activities”, employer-supported volunteering (ESV) benefits programs are now widely used in HR Practice. However, its impact on success and performance was sparsely researched. The bigger question that remained unclear is how they affect success. To describe the growing trend of employers providing employer-supported volunteering (ESV) benefits, Booth et. al. (2009) explored the formation of exchange relationships between employer and employee as well as between the voluntary organization and employee. Using the concept of gift exchange, we proposed a theoretical framework based on the Booth conceptualization of ESV and further modifying to concept to include moderators' effects in a unified structural framework. We hypothesized that ESV benefits would lead to success directly, as well as through an increase in voluntary hours as well as through gaining Skills Acquired from volunteering. Moreover, different demographic factors and recognition complement these effects. Empirical validity was established by conducting a survey using a close-ended questionnaire. Data was collected from about 300 employees that are volunteering in nonprofit organizations and the questionnaires are filled by visiting different nonprofit organizations operating in Karachi like Citizen Foundation, SIUT, and Indus hospital. Data were analyzed using confirmatory factor analysis and structured equation modeling. The results suggested that ESV benefits seem to have a significant and positive impact on the Perception of Job success directly, as well as through increasing volunteering hours. volunteering hours also seem to have a positive and significant impact on Skills Acquired from volunteering, however, ESV did not seems to affect skills directly. Employees with ESV would also seem to gain Flextime, however, the impact of flexible time on Volunteering is surprisingly negative. Moreover, Skills acquired as well as employee recognition seem to be positively affecting job success. The findings also suggested that Age, Income, Working Hours, and recognition does not seem to have any moderating effect on ESV and volunteering nexus. Education seems to effect volunteering positively however, higher education seems to lower the impact of ESV on Volunteering, hence have negative complementarities. Employee recognition also did not produce any effect on the effect of ESV on both skilled acquired, and job success. We discuss the implications of these findings for business, employees, and volunteer organizations, with an emphasis on human resource management policy and practice.