This study examined whether one partner’s additional resources obtained from a workplace intervention influence the other partner’s perception of having those resources at home (crossover of resources). We also examined whether one partner’s decreased stress by increased work resources crosses over to the other partner’s stress levels (crossover of well-being). Longitudinal data came from IT employees and their married/cohabiting partners in midlife (N = 327). A randomized workplace intervention significantly increased employee-reported schedule control at the 6-month follow-up, which, in turn, increased partner-reported employees’ work schedule flexibility to handle family responsibilities at the 12-month follow-up. The intervention also decreased partners’ perceived stress at the 12-month follow-up through the processes by which increases in schedule control predicted decreases in employees’ perceived stress, which further predicted decreased levels of partners’ perceived stress. Notably, crossover of resources and well-being were found in couples who lived with children in the household, but not in couples without children. Our findings suggest that benefits of workplace support can permeate into the family domain, by increasing partner-perceived family resources and well-being.