The Fawcett Society, which campaigns for women's rights, issued the warning as it dubbed Friday Equal Pay Day - saying it marked the time in the calendar year when women start to work for free due to their pay lag on male earnings.
It's Equal Pay day so, obviously, everyone is talking about the gender pay gap. The groups call for "significant action from Government, businesses and society".
With that in mind, the Women's Equality Party are encouraging women to set their out of office alert, reminding people that there is still a lot to be done to close the gender pay gap.
A charity warns the pay gap is widening for some women, fearing it could take a century to correct the imbalance.
Conservatives and Labour alike have pledged to act on the pay gap but both in this and the harassment cases their leaders have so far failed to join the dots. The gender pay gap now stands at 14.1%, that's the same as it was in 2015 and 2016. But while it is falling in London and the South East, by over 3% points since 2011, it has risen in the North East by 1.5%. There is a huge generational gap included in this, as the gap for women in their 30s (6.7%) is vastly smaller than for women in their 40s (17.1%).
The pay gap is not closing.
"Often this is because the sectors women tend to work in - such as administration, health and social care and retail - are not valued and paid as much as they should be".
They also list unequal care responsibilities as a factor, citing ECHR research which suggests 54,000 mothers a year are forced to leave work early as a result of pregnancy.
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Under new government rules, all companies with more than 250 employees will have to report their gender pay gaps by April 2018.
Breaking down the pay gap between extremely high male and female earners provides us with interesting, and mixed, information.
What Can Be Done? "We need to teach young men that it's ok to talk to women and not ok to objectify women".
'The pay gap won't close on its own - we all need to take action to make sure we address this.
According to the Fawcett Society, women in their twenties can expect to be paid 5.5 per cent less than men while women in their fifties experience an i8.6 per cent disparity.
This year, the gender pay gap has been front and centre of everyone's minds, particularly in the wake of the revelation that numerous BBC's woman presenters were paid less than their male colleagues. This inequality carries through to later life, as women's retirement prospects are generally worse than men's.
'Equal pay is both a cause and outcome of gender inequality and it creates the context for other inequalities, such as violence against women and girls and unequal access to health, ' the WEP adds.