Prime Minister Julia Gillard says she will push ahead with a plan to cut the payments of 100,000 single mothers despite objections from Parliament's human rights committee.
The government announced in the budget that from January next year all single parents would lose their parenting payments when their youngest child turned eight.
People who have become eligible for the payment since 2006 already face these conditions, but those who were receiving the payment in 2006 can currently keep the payment until their youngest turns 16.
If parents fail to find work after the change comes into effect, they would receive the Newstart allowance, about $60 a week less than the parent payment.
The move is expected to save more than $685 million over four years.