A female manager effectively works for nothing for 100 minutes of each day because of the pay gap between sexes, according to the latest authoritative survey.


The average pay for women managers of all ages and all professional roles is £30,612. A man in an equivalent job is paid £39,136.


That £8,524 gap is a slight improvement on 2014, when the figure was £9,069, but that 22 per cent gap is still equivalent to a woman doing unpaid work for an hour and 40 minutes per day, or 57 days a year.


The findings are from an annual survey of 72,000 UK managers, and have been published by the Chartered Management Institute (CMI) and salary specialist XpertHR.


Mark Crail, content director of XpertHR, said: “An entire generation has now worked its way through from school leaver to retirement since the first equal pay legislation came into effect in 1970, yet the gender pay gap persists.


“Many employers still prefer not to know just how bad it is in their organisation rather than getting to grips with the data and doing something about it.”


Next year the government will introduce new rules forcing companies with more than 250 workers to disclose the pay gap in their workplaces, despite fierce resistance from employers.


David Cameron has vowed to end the gender pay gap within a generation and has said the new rules would create the pressure needed to drive up women’s wages.


But Frances O’Grady, the general secretary of the TUC, the UK’s trade union body, said the government needed to do more.


“The government’s move to require companies to publish pay gap information is positive, but it doesn’t go far enough,” she said. “The UK will never really address the problem of unequal pay until there are systems in place to expose and tackle the huge gap between what men and women doing similar jobs in the same workplaces are paid.”


In March, the publication of Women on Boards: Davies Review Annual Report 2015 revealed that the number of women holding board-level positions in FTSE 100 companies reached 23.5 per cent – just short of the 25 per cent target.


John Morgan, of CMI’s North West board, said: “Having more women in senior executive roles will pave the way for others and ensure they’re paid the same as their male colleagues at every stage of their careers.”