In 1993, the benefit levels of the earned income tax credit (EITC) were changed significantly based on the number of children in the household. Exploiting this policy change and employing a difference-in-differences plus mother fixed effects framework, we find significantly improved home environment quality for children of unmarried mothers, regardless of their race/ethnicity, and lowered probabilities of having accidents and improved mother-rated health for children of married white mothers. Children of unmarried black and Hispanic mothers also had better mother-rated health. Our results provide new evidence of positive spillover effects of the 1993 EITC expansion and therefore have important policy implications.