Female employees at Barclays International – the part of the business which houses its private banking, in addition to investment banking – earn on average half as much as their male colleagues.
The 48% mean gender pay gap was revealed by the bank, after the government last year ruled that businesses with more than 250 UK employees would have to report gender disparities by April 2018.
Barclays said that gender difference was primarily due to the concentration of men in its upper ranks, rather than failing to pay men and women of equal seniority the same amount.
Seperate numbers supplied to the government under gender equality reporting rules showed that women recieved average bonus payments 73% lower than those of their male colleagues.
'We remain focused on improving gender diversity through a workplace environment and culture that supports and empowers women,' the bank said in a statement.
The company has a target of appointing women to one in three board positions by 2020, from just over one in five last year.
Within the UK part of the business, which contains the London-based Wealth division, the disparity was substantially lower, at 26%.
The report followed disclosures by Citigroup, Wells Fargo, Bank of America, and also the Bank of England. Lloyds has said that it will release its figures ahead of the deadline.