The parental pay gap over the life cycle: Children, jobs, and labor supply

Women earn less than men, and that is especially true of mothers relative to fathers. Much of the widening occurs after family formation when mothers reduce their hours of work. But what happens when the kids grow up? To answer that question, we estimate three earning gaps: the “motherhood penalty,” the “price of being female,” and the “fatherhood premium.” When added together these three produce the “parental gender gap,” defined as the difference in earnings between mothers and fathers. We estimate (log) earnings gaps for college graduates born around 1960 using longitudinal data from the NLSY79 and from the LEHD-Census that track respondents from their twenties to their fifties. As the children grow up and as women work more hours, the motherhood penalty is greatly reduced. But women, especially mothers, seem willing throughout their working lives to trade lower pay for various amenities, such as working in firms with management practices that are less penalizing of career interruptions or of shorter work schedules. Fathers, however, manage to expand their relative earnings gains as their children age, particularly among those working in time-intensive jobs, irrespective of work hours or firm fixed effects. The parental gender gap in earnings remains substantial over the family lifecycle.