Child Support Calculator — Estimate Your Payments
Estimate child support payments under the Australian Child Support Agency formula. Understand how income care percentage and number of children affect payments.
Australian child support is calculated using a complex income-shares formula that considers both parents incomes the number of children their ages and the percentage of care each parent provides. The formula deducts a self-support amount ($28463 per year) and costs of other dependents before calculating the child support obligation. Payments can range from $0 to over $30000 per year per child depending on circumstances.
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Key Information
| Parameter | Details |
|---|---|
| Self-Support Amount | $28463 per year (2026) |
| Minimum Assessment | $520 per year |
| Shared Care Threshold | 14% of nights (52 nights/year) |
| Dependent Child Cost | Varies by income and age |
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Use Calculator NowFrequently Asked Questions
How much child support will I pay on $100000 salary?
On a $100000 salary with one child aged 5-12 where the other parent earns $40000 and you have 20% care (73 nights/year): approximate child support is $12000-$14000 per year or $1000-$1167 per month. If you have 35% care (128 nights) the amount drops significantly to approximately $7000-$9000 per year. The exact calculation depends on many factors in the CSA formula.
Does shared care reduce child support?
Yes significantly. Below 14% care (52 nights) you pay the full assessed amount. At 14-34% care a percentage reduction applies. At 35-47% care (shared) both parents costs of the child are compared and the higher income parent pays the difference. At 48-52% (equal care) the payment is minimal as both parents are considered to contribute equally.
Can I reduce my child support payments?
Legitimate ways include: increasing your care percentage (more nights with the children) documenting necessary expenses like school fees paid directly. Income changes are automatically reassessed. You cannot reduce payments by salary sacrificing or restructuring income as CSA has broad powers to assess true earning capacity. Lodge a change of assessment if circumstances genuinely change.
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Last updated: March 2026