. . . [M]arried, residential, biological fatherhood is associated with wage gains of about 4 percent, but unmarried residential fathers, nonresidential fathers, and stepfathers do not receive a fatherhood premium. Married residential fathers also receive no statistically significant wage premium when their wives work full-time. About 15 percent of the wage premium for married residential fathers can be explained by changes in human capital and job traits.Source: Alexandra Killewald (American Sociological Review, 2013).