The price women pay to have children during their careers equates to a salary gap of about £300,000 (S$591,800) with that of men's, new data shows.
Women in the UK will on average earn 24-per cent less than men across a 52-year working life, analysis by recruitment company Robert Half published on Monday demonstrates.
This is mainly due to the breaks mothers take in their careers to have children. Many women struggle to return to work after having children, with the cost of childcare outweighing that of a lot of salaries.
The data also highlights the faster growth of men's salaries compared to that of women's. The median gross pay for full-time male employees was £29,934, compared with £24,202 for women, in the year to April 2015.
This was based on earnings figures from the Office for National Statistics (ONS), reported The Guardian.
In other data released ahead of International Women's Day, which is celebrated on Tuesday, PwC research shows that the UK is missing out on up to £170bn ($240 bn) worth of economic benefits by not having enough women in employment.
PwC's annual Women in Work Index, out Monday, shows that the UK could boost its economic output by nine-per cent if it increased the number of women in work to match that of Sweden, the highest-performing country in PwC's index.
The research states that the main area where the UK underperforms is the low share of women in full-time employment.
In line with PwC, Eurostat released data Monday showing that the number of women across Europe working part-time is increasing drastically.
Across the EU, the more children a woman has, the more likely she is to work part-time, while the opposite is true for men, at least up to two children.
Women earned on average 84 cents for every euro a man makes per hour, according to Eurostat.
International Women's Day celebrations have started across the world ahead of its official day.
In Turkey on Sunday, police fired rubber bullets to disperse a crowd of hundreds of people in central Istanbul. The group had ignored a ban on the march by the Istanbul governor who scrapped this year's rally, citing security concerns, reported Reuters.
They were seeking to draw attention to women's issues in Turkey, which ranks 77th out of 138 countries on a United Nations Development Programme (UNDP) index of gender equality.