The Child Support Agency, known as Services Australia (Child Support), calculates the amount of child support payable by one parent to the other using a formula which takes into account both parents’ incomes, the percentage of care of the child(ren) each parent has and the cost of living depending on the age of the child(ren). You can obtain an estimate and further information via the Child Support Agency website.
Child Support is ordinarily payable until the youngest child is 18 years of age. If the child is at school in the year they turn 18, you can apply to the Agency so that payments continue until the end of the school year.