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child support calculator Australia — care percentage and income shares

enter each parent's income and how many nights per year the child spends with each parent. we'll calculate the care percentage, income share and child support percentage using the Services Australia 8-step formula.

last verified: 23 April 2026

$

your taxable income for the year, from your tax return or payslip.

$

the other parent's taxable income. if unknown, use a rough estimate.

nights

365 = full care with you. 182 ≈ 50/50 shared. 104 ≈ every second weekend + half school holidays.

this calculator provides estimates based on published government rates and formulas. your actual entitlement may vary based on your full circumstances. always check with Services Australia for a precise figure.

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related guides

→ Centrelink family payments overview→ Working with Children Check by state

how the formula works: Services Australia runs an 8-step formula defined in the Child Support (Assessment) Act 1989. this tool shows the first 6 steps — income shares and care percentages — which are the most common source of disputes and uncertainty.

source: Services Australia — Child Support · basic formula

this tool provides an estimate based on published formula rules. the exact dollar figure comes from the annually-updated Costs of Children table — use the Services Australia estimator for that step. for complex cases (multiple children across relationships, income below self-support, non-parent carers, special circumstances) Services Australia uses modified formulas.