The "no jab, no pay" proposal has had a mixed reaction from immunisation experts, who say it would be more effective to spend money on programs that targeted families that wanted to be immunised, but faced barriers such as poverty or had missed vaccines because they were born overseas.

The government announced its 'no jab, no play' policy earlier this year.

University of Sydney associate professor Julie Leask has said only about 2 per cent of families are registered as conscientious objectors to vaccination, and about half of those are not so rusted on to their positions that they might be influenced by the changes to family payments.

On the other hand, about 4 or 5 per cent of parents have not had their children fully immunised because of difficulty accessing the program.

Under the "no jab, no pay" policy, from January 2016 families will no longer be eligible for subsidised child care, worth thousands of dollars each year, if their children are not up to date with their vaccinations, or the Family Tax Benefit Part A end-of-year supplement.