Services Australia Child Support Assessment Calculator
Estimate statutory child support payable using the official 8-step formula based on both parents' taxable incomes and percentage of care nights.
Estimate statutory child support payable using the official 8-step formula based on both parents' taxable incomes and percentage of care nights.
Estimate statutory child support payable using the official 8-step formula based on both parents' taxable incomes and percentage of care nights. Calculate exact, penny-accurate projections compliant with 2026 ATO • Reserve Bank of Australia (RBA) standards using Calconova's deterministic IEEE-754 (Decimal.js) calculation engine with instant breakdowns.
Monthly: $622.00 (~$144.00/week).
Child Support = (Income Share % - Cost of Care %) × Total Costs of the ChildrenCosts of children are derived from the official annual Costs of Children Table based on combined income.
All calculations, amortizations, and scenario projections displayed on this page are strictly for informational and educational purposes. Nothing herein constitutes investment, financial, tax, or legal advice. Actual ATO tax rates, superannuation rules, RBA cash rates, and lender criteria may vary. Calconova explicitly disclaims all liability for any decisions taken based upon these calculations. Consult an ASIC-licensed financial advisor or CPA prior to executing financial commitments.
The formula deducts a Self-Support Reserve from each parent's income, calculates their income share percentage, determines their care percentage from overnight stays, and compares income share to care cost to determine transfer amounts.
The self-support reserve (approx. $29,000) is an income amount protected from child support so each parent can cover their own basic living expenses before contributing to the children.
Shared care occurs when a parent cares for a child between 35% and 65% of the time (128 to 237 nights per year), which significantly reduces or balances the child support payment amount.
Calculate net take-home pay across weekly, fortnightly, monthly and annual periods with updated Stage 3 tax cuts, Medicare Levy (2%), and 12% Superannuation.
Calculate compulsory HECS/HELP repayments based on your Repayment Income (1% to 10% tiers) and estimate annual inflation indexation impacts.
Estimate your 2% Medicare Levy, low-income threshold phase-in relief, and Medicare Levy Surcharge (MLS 1% to 1.5%) if you do not have private hospital cover.