Who Pays Child Support in a Divorce?

Child support after separation is usually paid by the parent with less than 35% care of the child. If care is shared, the paying parent is the one whose income percentage is greater than their cost percentage.

Australia uses an administrative formula through Services Australia rather than leaving parents to negotiate amounts privately or asking courts to determine payments.

Child support can begin once parents separate, even if they are still legally married or still living under the same roof. Divorce itself does not trigger child support obligations. Payments become mandatory once an application is made.

Which Parent Pays

The parent who pays child support is the parent with less than 35% care. If care is shared, the payer is the parent whose income percentage is greater than their cost percentage.

Care arrangement	Result
Less than 35% care	Pays child support.
Shared care, 35% to 65%	The parent whose income percentage is higher than their cost percentage pays.

The parent who has the children less often pays child support. If care is shared more evenly, the higher-income parent usually pays the other parent instead.

When Child Support Can Start

Child support does not depend on the divorce date. A parent can apply once the parents are separated, even if they are still legally married. The start point is tied to the application for a child support assessment, not the final divorce order.

Parents can also be considered separated while still living in the same home. Australian policy recognises separation under one roof where the relationship has genuinely broken down and there is no intention to reconcile.

A child support assessment can begin before anyone moves out. Parents do not need to wait for a divorce order before applying through Services Australia. Parents can also start looking at post-divorce investment strategies, which may be especially beneficial where joint property is involved.

How Payments Are Worked Out

Australia’s child support formula compares each parent’s income percentage with their cost percentage. In shared care situations, the difference between the two determines who pays child support.

• Income percentage is each parent’s share of the combined child support income. Child support income is worked out by subtracting a self-support amount from each parent’s taxable income.
• Cost percentage is based on the level of care provided for the child. A parent with less than 14% care has a cost percentage of nil, while a parent with 48% to 52% care has a cost percentage of 50%.

Small changes in overnight care can noticeably affect the assessment because fixed care thresholds apply. A shift of only one or two nights per fortnight may also affect Family Tax Benefit entitlements.

How Services Australia Handles Assessments

In Australia, child support is normally handled through Services Australia rather than through the Family Court. Parents can apply for an administrative assessment after separation, and the agency calculates the amount payable under the statutory formula.

Courts become involved only in limited situations, such as appeals, special circumstances applications, or disputes that cannot be resolved through the administrative review process. Most parents must first complete the Services Australia objection and review pathways before seeking court intervention.

Binding Child Support Agreements

Parents can also enter into a binding child support agreement instead of relying on the standard formula assessment. A binding agreement is a written agreement that fixes how much child support will be paid and how it will be paid.

Once accepted, the agreement overrides the normal child support formula. Payments can include regular transfers, lump sums, or direct payment of expenses such as school fees or medical costs. Each parent must receive independent legal advice before signing the agreement.