Intimate partner violence often includes economic abuse; unfortunately, economic abuse has not been examined sufficiently in the literature. Using longitudinal data from the Fragile Families and Child Wellbeing Study, this paper examined the occurrence of and changes in economic abuse and physical violence over time and how these factors influenced union formation. The results indicated that the prevalence of economic and physical abuse increased over time, particularly for economic abuse. The changes in union formation for cohabiting and visiting mothers were quite substantial over time. Regression analyses indicated that, over time, the occurrence and the increase of economic abuse and the increase of physical violence were significantly and negatively associated with the likelihood of stable union formations such as marriage and cohabitation. Policy and research implications are discussed.