How Much Child Support Will I Pay on $100k?
If you make $100k in Australia, the amount of child support you pay could technically range from $0 up to a maximum of $20,120 per year in 2026.
The payment amount is highly variable and depends on how much care you provide, the income of the other parent, and the number and ages of the children.
A realistic range for most payers is between $7,686 per year for one child and $12,457 for two children. These scenarios assume you have regular care of 2–4 overnights each fortnight and the other parent has a taxable income of $50,000 annually.
How Much Will You Usually Pay?
A parent earning $100,000 may pay between $7,686 and $12,457 per year for one or two children when providing 2–4 nights of care per fortnight and the other parent earns $50,000. The exact amount also depends on the ages of the children and any differences in income or care.
Parents asking this question want a dollar guide, not a purely theoretical answer. The examples below show both the extreme outcomes and the typical ones.
You can also quickly estimate your payment using our child support calculator for Australia.
Disclaimer: This information is based on Australian law and is for general guidance only. Services Australia issues legally enforceable administrative assessments of child support.
What Determines Your Child Support Payment?
Child support is calculated using a legislated formula administered by Services Australia. The formula considers each parent’s taxable income, the self-support amount, the number and ages of the children, and the care provided by each parent.
The result is an annual assessment that may be payable, nil, or in some cases payable in the opposite direction depending on relative income and care.
Related: How to Avoid Child Support Legally (12 Ways)
How Does Your Care Level Affect Payments?
Care is measured by the number of overnight stays per fortnight. Services Australia places each parent into a care band that affects the amount of child support payable.
| Nights per fortnight | Administrative care level |
|---|---|
| 0–1 | Less than regular care |
| 2–4 | Regular care |
| 5–6 | Shared care |
| 7 | Equal care |
The examples below use less than regular care, regular care, and equal care to illustrate how assessments change at different care levels.
What Is the Most You Could Pay? ($20,120)
The maximum standard assessment on a $100,000 income is $20,120 per year in 2026. The amount applies when you have less than regular care, the other parent earns below the self-support amount, and there are at least three children.
Inputs
- Your taxable income: $100,000
- Other parent’s income: $0 to $31,046
- Children: 3 or more children of mixed ages
- Your care: 0–1 nights per fortnight
Result
- Status: Pay
- Annual child support: $20,120
- Monthly payment: $1,677
When Could You Pay Nothing? ($0)
You may pay no child support when care is shared equally and both parents have similar incomes. Under this scenario, the annual assessment on a $100,000 income is $0.
Inputs
- Your taxable income: $100,000
- Other parent’s income: $100,000
- Children: Any number > 0
- Your care: 7 nights per fortnight
Result
- Status: Nil
- Annual child support: $0
- Monthly payment: $0
What Might You Pay for One Child? ($7,686)
A parent earning $100,000 may pay about $7,686 per year for one child when the other parent earns $50,000. The example assumes the paying parent provides regular care of 2–4 nights per fortnight.
Inputs
- Your taxable income: $100,000
- Other parent’s income: $50,000
- Children: 1 child aged 0–12
- Your care: 2–4 nights per fortnight
Result
- Status: Pay
- Annual child support: $7,686
- Monthly payment: $641
The $50,000 assumption reflects a typical moderate income for the primary carer. In regular-care scenarios, the assessment is not highly sensitive to moderate changes in the primary carer’s income.
What Might You Pay for Two Children? ($12,457)
A parent earning $100,000 may pay about $12,457 per year for two children when the other parent earns $50,000. The example assumes the paying parent provides regular care of 2–4 nights per fortnight.
Inputs
- Your taxable income: $100,000
- Other parent’s income: $50,000
- Children: 2 children of mixed ages
- Your care: 2–4 nights per fortnight
Result
- Status: Pay
- Annual child support: $12,457
- Monthly payment: $1,038
This defines the upper end of the realistic range for parents on $100k who still have regular care. Most child support cases involve one or two children.
Related: How Much Is Child Support in Australia?
Does Your State Affect the Amount?
Child support payments are calculated under the same national formula throughout Australia. An identical family situation produces the same assessment whether you live in NSW, Victoria, Queensland or another state or territory.