Child Support Agreement (New Zealand)

A Child Support Agreement in New Zealand records the care, contact, and decision-making arrangements for a child between the parents or guardians, consistent with the Child Support Act 1991.

A voluntary Child Support Agreement under Part 4 of the Child Support Act 1991 can be registered with Inland Revenue, making it fully enforceable through IRD's collection service. Once registered, IRD collects the agreed amount from the paying parent, transfers it to the receiving parent, and takes enforcement action if payments are missed — including direct deductions from wages, bank accounts, and tax refunds. This provides far greater security and convenience for both parties than an unregistered private arrangement.

Child support is intended to confirm that both parents contribute financially to the cost of raising their children, in proportion to their income and the time they each spend caring for the children. Under the Child Support Act 1991, child support is payable for a 'qualifying child' — a child who is under 19 years of age, is a New Zealand citizen or ordinarily resident in New Zealand, and is a dependent child not living with the liable parent.

The Child Support Act 1991 uses the concepts of 'liable parent' (the parent paying child support) and 'recipient' (the parent receiving it, who provides primary day-to-day care). Where care is shared equally, both parents may have child support obligations that offset each other. Inland Revenue calculates obligations using a care time table based on the number of nights the child spends with each parent.

A voluntary Child Support Agreement may be above the formula assessment without IRD involvement, or below the formula assessment only if confirmed by the Family Court. The agreement should clearly state the amount, frequency, payment method, commencement date, and arrangements for review and extraordinary expenses. The Child Support Act 1991 was substantially reformed by the Child Support Amendment Act 2013 (effective from 2013-2015 phase-in) to better reflect actual care arrangements and both parents' incomes. Under the amended formula, sections 35 to 50 of the Child Support Act 1991 set out the income-sharing model that determines each parent's child support liability based on their adjusted taxable income as assessed by Inland Revenue.

A Child Support Agreement is needed whenever parents separate and there are children under 19 years of age who need financial support from both parents. Child support is not optional in New Zealand — it is a legal obligation under the Child Support Act 1991, and Inland Revenue actively pursues unpaid child support.

A voluntary Child Support Agreement is particularly useful when parents want to agree on an amount different from the IRD formula assessment — for example, to take into account extraordinary expenses such as private school fees, medical costs, extracurricular activities, or the specific financial circumstances of the family. It is also useful when parents prefer to handle payments directly between themselves without involving IRD, or when they want a formal document recording their agreement for clarity and certainty.

For parents who are on good terms and able to cooperate, a voluntary agreement registered with IRD provides the benefit of IRD's collection and enforcement mechanisms without the formality of a court order. For parents who have difficulty cooperating, having payments collected through IRD (including automatic wage deductions) removes the need for direct contact over financial matters, which can reduce conflict.

A Child Support Agreement should be reviewed whenever either parent's income changes significantly (by more than 15%), when the care time arrangements change, when a child starts or finishes tertiary education, or when any child ceases to be a qualifying child. Inland Revenue allows either parent to apply for a reassessment of the formula assessment at any time on the grounds of a change in circumstances.

Child support and parenting arrangements are separate legal matters — a Child Support Agreement should be prepared alongside, but separately from, a Parenting Agreement under the Care of Children Act 2004.

A thorough New Zealand Child Support Agreement under the Child Support Act 1991 should include the following key elements.

Parent Identification clearly names both the paying parent (liable parent) and receiving parent (recipient), including their full names, addresses, and IRD numbers. IRD numbers are essential if the agreement is to be registered with Inland Revenue.

Children Details lists all qualifying children covered by the agreement, including their full names and dates of birth. Child support obligations are calculated per qualifying child and cease when each child turns 19 or ceases to be a dependent child.

The Payment Amount Clause specifies the exact dollar amount (in NZD) of child support to be paid, the frequency (weekly, fortnightly, or monthly), and the commencement date. If the amount is based on the IRD formula, the relevant formula calculation should be noted. If the amount differs from the formula, the reasons should be documented.

Payment Method Options include direct bank transfer from the paying parent to the receiving parent, or collection through IRD's administrative collection service. If paid through IRD, the agreement must be registered using the relevant IRD forms (currently IR-179 or equivalent).

The Duration Clause specifies that child support continues for each child until they cease to be a qualifying child under the Child Support Act 1991 — generally when they turn 19 or leave full-time education or financial dependency. The clause should note that obligations for each child may end at different times.

Annual Review Provisions allow either parent to seek a reassessment if circumstances change materially. The agreement should specify the grounds for review and the process for renegotiating if the agreed amount becomes inappropriate.

Extraordinary Expenses Provisions deal with costs beyond the regular child support payment — private school fees, significant medical expenses, overseas trips for education, or special sports or arts programmes. These should be listed and the cost-sharing ratio agreed.

The IRD Registration Note reminds parties that to register the agreement with Inland Revenue, additional IRD forms must be completed and submitted, and both parties must sign the registration forms. The forms-legal.com Child Support Agreement (New Zealand) provides a ready-to-use template that meets New Zealand legal requirements. Additional provisions to include in a New Zealand Child Support Agreement include: a clause addressing the treatment of extraordinary expenses under section 96U of the Child Support Act 1991, which allows either parent to apply to IRD for a departure from the formula assessment to cover significant extra costs; a clause specifying the process for notifying IRD of changes to income or care arrangements under section 96D of the Act; and a clause confirming that the agreement will be reviewed whenever either parent's income changes by more than 15% or when the care time arrangement changes materially.