New Partner Income & Child Support Australia 2026 | Does It Affect You?
Remarried or living with a new partner? You're probably wondering: does their income affect your child support? The short answer: not directly. But there are exceptions. Here's exactly how new partner income works in Australian child support law, when it matters, and how to protect yourself.
Does My New Partner's Income Affect Child Support in Australia?
No, your new partner's income does NOT affect child support in Australia. The formula only considers the biological or adoptive parents' incomes. However, if your new partner pays most household expenses, allowing you to hide income or reduce work hours, the other parent can apply for a Change of Assessment (Reason 8) arguing your actual capacity to pay is higher.
No. Your new partner's income is NOT included in the standard child support formula. Only YOUR income and the other parent's income count. However, there are important exceptions you need to know about.
Does my new partner's income affect child support in Australia?
The Australian child support formula uses only two incomes:
Your new partner's income is excluded. This applies whether you're married, de facto, or just living together. The formula doesn't care how much your new partner earns.
When Your Earning Capacity Can Be Questioned
While new partner income isn't in the formula and must be legally disregarded, your ex can challenge your child support if you deliberately reduce YOUR OWN income or earning capacity after moving in with a high-earning partner. This is assessed under Reason 8B (earning capacity), not based on your partner's income.
If your ex applies for a Change of Assessment under Reason 8B (earning capacity), Services Australia will investigate whether you deliberately reduced your income to avoid child support. Learn more about router.push('/blog/object-to-child-support-assessment')} > how to object to assessments
How Services Australia Assesses Earning Capacity
Services Australia will determine whether you deliberately reduced YOUR OWN earning capacity to avoid child support obligations. They cannot consider your partner's income directly, but will assess whether your income reduction was legitimate or designed to avoid obligations. This is assessed case-by-case.
If your ex has a new high-earning partner and you believe they deliberately reduced their income to avoid child support, you can apply for a Change of Assessment under Reason 8B (earning capacity). Here's how:
How to Protect Your Assessment
What If You're the Receiving Parent?
Frequently Asked Questions
Frequently Asked Questions
Does my new partner's income affect child support in Australia?
No. Your new partner's income is NOT included in the standard child support formula, and the Registrar must legally disregard it under section 117(7A). Only your income and the other parent's income matter. However, if you deliberately reduce your own income after moving in with a high-earning partner, Services Australia may investigate your earning capacity under Reason 8B.
Can my ex apply for a Change of Assessment based on my new partner's income?
Not directly. The Registrar must disregard your new partner's income under section 117(7A). However, your ex can apply under Reason 8B (earning capacity) if you deliberately reduced your own income or earning capacity after moving in with a high-earning partner. Most applications fail unless there's clear evidence of deliberate income reduction to avoid child support.
What if my new partner pays all the bills?
If your new partner covers expenses AND you deliberately reduced your income or working hours as a result, your ex can apply under Reason 8B (earning capacity). The focus is on whether YOU made deliberate choices to reduce your earning capacity, not on your partner's income. Services Australia will assess if you're avoiding child support obligations through deliberate income reduction.
Can I reduce my income if my new partner supports me?
You can reduce your income, but if it appears deliberate to avoid child support, Services Australia may assess your earning capacity under Reason 8B. If you quit your job or reduce hours shortly after moving in with a high-earning partner without legitimate reasons (health, education, childcare), your ex can argue you're deliberately avoiding obligations. The Registrar may set your income based on your earning capacity, not actual income.
What if my ex's new partner is wealthy?
The new partner's wealth cannot directly increase child support—the Registrar must disregard it. However, you can apply under Reason 8B if your ex deliberately reduced their income after moving in with the wealthy partner. You need evidence of deliberate income reduction (timing, employment history, refused opportunities). Most applications fail without proof of deliberate avoidance of child support obligations.
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