This resource is typically useful when you are considering how much you need to pay for child support. In most cases, you will be legally obligated to pay to support the child until they are 18. The amount is typically calculated based on the amount of “overnight” care you have of any children plus the amount you are earning.
Access the website here: https://www.humanservices.gov.au/individuals/services/child-support/
The Child Support Agency is part of the Department of Human Services. You can find more about your responsibilities here: