"In most common occupations women still make less than men doing the same job for an equal amount of hours, according to new data released on Tuesday.
Overall they earn 77 cents for each dollar made annually by men and in some professions such as financial managers the number drops to 66 cents.
"These gender wage gaps are not about women choosing to work less than men - the analysis is comparing apples to apples, men and women who all work full time - and we see that across 40 common occupations, men nearly always earn more than women," said Ariane Hegewisch, a study director at the Institute for Women's Policy Research (IWPR), a non-profit research organization.
She added that the reasons are varied but discrimination law cases show that women are less likely to be selected for the best jobs, they get hired at a lower rate and don't get equivalent raises to men over the years.
"Discrimination in who gets hired for the best jobs hits all women but particularly black and Hispanic women," Hegewisch explained."