Child Support Second Family | Impact on Payments
• Updated February 14, 2026
How Second Families Affect Child Support
Understanding router.push('/blog/child-support-formula-australia')} > how the child support formula works
The formula includes a deduction for each "relevant dependent child" living with you:
Relevant Dependent Child Deduction
Your new partner's income is NOT automatically included in child support calculations. However, the other parent can apply for a router.push('/blog/change-of-assessment-reasons')} > Change of Assessment
Step-children can be counted as relevant dependent children if:
Example Calculations
When New Partner Income Matters
Step-Children and Child Support
Common Scenarios
Frequently Asked Questions
Calculate Your Child Support
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