Mackintosh said New Zealand law already dictated that taking this unpaid labour from women was illegal.
"The free ride is about to end," she said. "We have three parties in government now who have committed to putting the agreed equal pay principles into the current law and not creating additional hurdles for women. This will create a swift and clear legal pathway for women to claim the pay that's rightfully theirs.
"Most people in 2017 would agree that paying women fairly for the work they do is overdue."
The CTU had launched a "countdown clock" for November 14, 2018, "So we can look back together in a year's time and celebrate having fair equal pay law that's working well for all women", Mackintosh said.
According a 2017 report on the gender pay gap by the Ministry for Women, traditional drivers such as type of work, family responsibilities, education, and age no longer explained the majority of the divergence.
"In fact, around 80 per cent of the gender pay gap is now due to 'unexplained' factors, which the ministry views primarily as behaviour, attitudes, and assumptions about women in work, including unconscious bias," the report says.