Male bonuses double those of women, says study
20 August 2013 Last updated at 15:18 BST
The pay gap between men and women is exacerbated by bonus payments given to male managers which are on average double those for women, says the Chartered Management Institute (CMI).
Male managers' average extra payments were £6,442 last year compared with £3,029 for women.
The CMI said their salaries were already almost 25% higher than women's.
BBC Chief Economics Correspondent Hugh Pym reports.