Child Support Calculator

A sophisticated mathematical equation designed to calculate child support using income, care arrangements and just enough complexity to make you question your entire romantic history.

A quick estimate of child support under the 2026 formula. Enter each parent's income and how many nights the children spend with each person. It covers shared care, other children at home, multiple child support cases and non-parent carers.

1. The children

Enter each child you and the other parent have together, and how many nights a year each person usually has them. Nights should add up to 365.

Someone other than a parent (such as a grandparent) also cares for the children

2. Parent 1

Adjusted taxable income (a year)Taxable income plus items such as reportable fringe benefits, net investment losses and tax-free pensions. Receives an income support payment (for example JobSeeker or Parenting Payment) Has not lodged tax returns, or their income can't be verified

Other children living with Parent 1 full timeChildren from a new relationship, not part of any child support case. Enter ages.

Children in other child support casesChildren Parent 1 pays or receives child support for with a different person. Enter ages.

Number of other child support cases

3. Parent 2

Parent 2's situation

Adjusted taxable income (a year) Receives an income support payment Has not lodged tax returns, or their income can't be verified

Other children living with Parent 2 full timeEnter ages.

Children in other child support casesEnter ages.

Number of other child support cases

This is an estimate only. It uses the 2026 child support formula and rates under the Child Support (Assessment) Act 1989 (Cth) and assumes the same care and income all year. Your actual assessment is made by Services Australia and can differ, for example because of changes of assessment, child support agreements, court orders, income estimates, children turning 13 or 18 during the year, or more than one non-parent carer. It is not legal advice. For an official figure, use the Services Australia estimator, or talk to us.

Child Support Calculator

1. The children

2. Parent 1

3. Parent 2

Ready to talk it through?