You have the ability to apply for an administrative review against you if you feel one of following 10 grounds apply:

1. You have a duty to maintain another child (or children) or person.
2. It costs you extra to cover the special needs of another child (or children) or person you have a duty to maintain.
3. You have necessary expenses in supporting yourself.
4. You have necessary expenses in supporting another child (or children) or person you have a duty to maintain.
5. It costs the person incurring the costs more than 5% of the year's adjusted taxable income to have contact with the child (or children).
6. It costs you extra to cover the child's (or children's) special needs.
7. It costs you extra to care for, educate or train the child (or children) in the way that was expected by either parent.
8. The child support assessment doesn't take into account the income, earning capacity, property and financial resources of either parent or child (or children).
9. The child support assessment doesn't take into account that you have previously made payments, transfers and property settlements for the benefit of the child(or children).
10. You still have a financial interest in a property that the other person is entitled to live in.

We can advise you whether you should apply or defend such a review. Lawyers can prepare papers for clients but are not able to appear at the review. Find more info on the IRD website or here."The information posted on this website is prepared for a general audience, without investigation into the facts of any particular case. This information is no substitute for legal advice and does not create a lawyer-client relationship; you are advised to consult with a lawyer on any legal issue."