A proposal to extend overtime pay eligibility to millions of workers would have its biggest impact on single mothers and women of color, according to a study published Tuesday by the Institute for Women’s Policy Research (IWPR) and the advocacy group MomsRising.

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Changing overtime rules could make an estimated 5.9 million workers newly eligible for time-and-a-half pay. From an analysis of 2014 data from the Census Bureau and the Bureau of Labor Statistics, researchers from IWPR and MomsRising estimated that 54 percent of the workers newly eligible for overtime would be women. Single mothers, black women and Latinas would disproportionately benefit compared with other demographic groups.