In this report, we use dynamic microsimulation techniques to project the lifetime employment-related costs of providing unpaid family care by women born between 1981 and 1985 who ever have biological children or stepchildren. We consider the care that a woman provides to her own children or stepchildren under age 18 who live with her and the care that she provides at ages 51 and older to her parents, parents-in-law, and spouses (including unmarried partners) with care needs. We estimate the lifetime employment-related cost of providing care as the earnings lost each year because of caregiving activities, summed over a lifetime, plus the related lifetime loss of retirement income from Social Security and employment-based retirement plans. Earnings losses generally reduce future retirement income. (author abstract)