Child Support Calculator — Estimate Your Payments — Australia 2026
Estimate child support payments under the Australian Child Support Agency formula. Understand how income care percentage and number of children affect.
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.
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.
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Child Support Calculator
How to Use This Calculator
Enter your values in the fields above and the calculator will compute results instantly as you type. You can adjust any input to compare different scenarios. All calculations happen in your browser — no data is sent to any server and nothing is stored. Use the share buttons below the results to save or send your calculations via WhatsApp, Twitter, or by copying the link. For related calculations, check the suggested tools in the "What to calculate next" section below.
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.
Are these calculators free to use?
Yes, all calculators on CalcCorp are completely free — no registration, no login, no hidden charges. Results are calculated instantly in your browser and we do not store any of your data.
How accurate are these calculations?
Our calculators use standard financial formulas updated with the latest tax rates, interest rates, and government policies for 2026. Results are accurate for planning purposes but should be verified with a professional for final decisions.
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Last updated: March 2026