Prime Minister John Key says he hopes that plans to write off $1.7 billion in penalty payments on parents who missed child support payments will encourage those who have moved overseas to start paying child support again.
Revenue Minister Todd McClay said the overly punitive system had resulted in "paralysing" debts for some parents which meant they had given up trying to pay and thousands had gone overseas.
About 120,000 people had child support debt which totalled $3.2 billion - about half of which was owed by people now living overseas. Only $700 million of the total was in child support while the rest was interest and penalty fees for late payments.
Mr Key said it was the responsibility of liable parents to make child support payments. "They have a legal obligation to pay for their kids and they have a moral obligation to pay for their kids, and they should be doing it."
However, the Government had to take a pragmatic approach and recognise that many were simply failing or could not afford to meet those obligations.