The child support assessment formula

The child support assessment formula looks at circumstances to work out how child support should be paid.

How we work out who pays

Normally you’ll:

  • pay child support if your percentage of care of a child is less than your share of the combined income, or
  • receive child support if your percentage of care of a child is more than your share of the combined income

How we work out the amount

We look at:

  • the parents’ income and combined income
  • how much time each parent cares for the child, and
  • the child’s age

The costs of a child we work out is based on research into what parents spend on children in Australia.

The figures change each year to keep up with current costs and incomes.

Read more about our basic formula for child support amounts on the Child Support Guide website.

Read details of child support amounts on the Department of Social Services website.

Link between child support and Family Tax Benefit

You may need to apply for a child support assessment to receive more than the base rate of Family Tax Benefit Part A.

Normally:

  • the more child support you receive, the less Family Tax Benefit you receive, and
  • the less child support you receive, the more Family Tax Benefit you receive

Page last updated: 18 October 2017