Scenario Calculator Guide
Child Support With a Second Family in Australia
A second family can reduce the income available for an existing assessment, but it does not erase a child support liability automatically.
Use this scenario when one parent supports children from another relationship and wants to understand how relevant dependant rules or multi-case treatment may change the result.
What changes the result
- Relevant dependant children are handled differently from children already in another formal child support case.
- Second family issues often change the result through income adjustments rather than care percentages.
- Multi-case families are among the most misunderstood parts of the Australian formula.
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Use the main calculator to test this scenario with your own income, care, and family structure.
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Frequently asked questions
Does having another child automatically reduce child support?
Not automatically. The formula applies specific dependant and multi-case rules, and the impact depends on the wider family structure.
What is the difference between a second family and a multi-case family?
A second family usually refers to relevant dependants in the household, while a multi-case family involves multiple child support assessments across relationships.