RT Journal Article SR Electronic T1 Effects of the Affordable Care Act on Part-Time Employment JF Journal of Human Resources JO J Hum Resour FD University of Wisconsin Press SP 1394 OP 1423 DO 10.3368/jhr.57.4.0718-9623R2 VO 57 IS 4 A1 Marcus Dillender A1 Carolyn J. Heinrich A1 Susan Houseman YR 2022 UL http://jhr.uwpress.org/content/57/4/1394.abstract AB The Affordable Care Act (ACA) requires employers with at least 50 full-timeequivalent employees to offer “affordable” health insurance to employees working 30 or more hours per week. Employers who do not comply may face substantial penalties, but they can circumvent the mandate by reducing employees’ weekly hours below the 30-hour threshold. We examine ACA’s effects on short-hours part-time employment using difference-in-differences models. We find that the ACA increased low-hours, involuntary part-time employment by 500,000–700,000 workers in retail, accommodations, and food services, the industries in which employers are most likely to reduce hours if they choose to circumvent the mandate.