Findings claim the Government extinguishing pay-equity claims destroyed an earlier system that was fit for purpose.
The People's Select Committee - a group of 10 former women MPs - has released its final report on the changes rushed through by the coalition under urgency last year.
It held three months of hearings and almost 1400 submissions.
Group chair and former National MP, Dame Marilyn Waring, raised questions about the 'urgency' that this legislation was rushed under.
"This wasn't an emergency war regulation, it was an equal pay amendment. It's just quite unnecessary, you don't do that. And so, it was all done simply for the Budget."
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