New Zealand Law
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It is not his former partner who sets the amount for child support, which is calculated by Inland Revenue based on the income and exemptions which he has. The amount is calculated according to the Child-Support Act rather than what the mother asks for so it is independently calculated. If he has equal shared parenting, then the child-support would be reduced in proportion. So it is probably a good idea to start this process although I expect the mother is likely to object as this will reduce her income, although it does give her an opportunity to earn more in her wages.