Temporary help services (THS) firms are increasing their hiring of disadvantaged individuals and claiming more subsidies for doing so. Do these subsidies—the Work Opportunity Tax Credit (WOTC) and Welfare-to-Work Tax Credit (WtW)—create incentives that improve employment outcomes for THS workers? The authors examine the distinct effects of THS employment and WOTC/WtW subsidies using administrative and survey data. Results indicate that WOTC/WtW-certified THS workers have higher earnings than WOTC-eligible but uncertified THS workers. However, these workers have shorter job tenure and lower earnings than WOTC/WtW-certified workers in non-THS industries. Panel estimates suggest that these effects do not persist over time.