With increasing pressure on retirement-aged individuals to provide informal care while remaining in the work-force, it is important to understand the impact of informal care demands on individuals’ retirement decisions. This paper explores whether different intensities of informal caregiving can lead to retirement for women in the United States. Using the National Longitudinal Survey of Mature Women, we control for time-invariant heterogeneity and for time-varying sources of bias with a two-stage least squares model with fixed effects.