What will your child support actually be?

The eight-step Services Australia formula uses both parents' taxable incomes minus a Self-Support Amount ($28,463 in 2024, indexed annually). It looks up the cost of children from published tables, then adjusts for the care percentage each parent provides. The formula was introduced in its current form in 2008 following major reforms to the Child Support Scheme.

The median registered payment is approximately $100 per week ($5,200 per year). The mean is approximately $150 per week ($7,800 per year). Payments vary significantly depending on both parents' incomes, the number and ages of children, and the care split. Approximately 65% of separated parents make informal arrangements outside the registered system.

Care percentage is one of the most significant variables. Below 14% care (fewer than 52 nights/year), you receive no cost reduction. At 14–34% care, you receive a 24% cost reduction. At 35–47%, the reduction increases proportionally. At 48–52% (equal care), each parent bears 50% of costs. The difference between 51 and 52 nights per year is a significant threshold.

Yes. Approximately 65% of Australian child support arrangements are made informally. These are called private collect or self-managed arrangements. However, if the arrangement breaks down, there is no enforcement mechanism until a formal assessment is registered. Parents can register a Binding Child Support Agreement (requires independent legal advice) or a Limited Child Support Agreement with Services Australia.

Child support generally continues until the child turns 18. It can end earlier if the child marries, enters a de facto relationship, or becomes financially independent. It does not automatically extend to cover university education, unlike some other countries. A change of assessment application can be made if either parent's circumstances change significantly, such as a major income change, new child, or change in care arrangements. Services Australia reviews assessments annually based on updated tax return income data.

The Self-Support Amount is a fixed figure deducted from each parent's taxable income before the formula is applied. It represents the minimum income a parent needs to support themselves. For 2024, it is $28,463, indexed annually to Average Weekly Earnings. Both parents' incomes are reduced by this amount before calculating their child support incomes. The Self-Support Amount ensures neither parent is required to contribute beyond their realistic means and acknowledges that parents must be able to sustain themselves in order to provide ongoing care.

If a paying parent defaults on a registered child support assessment, Services Australia can collect through the Collect and Pay service. Enforcement options include garnishing wages directly from the employer, intercepting tax refunds, placing a charge on property, suspending driver's licences, refusing passport applications, and in serious cases pursuing criminal prosecution for persistent non-payment. The compliance rate for registered cases is approximately 72%. International enforcement is possible through reciprocal agreements with 36 countries including the UK, US, New Zealand, and most of Europe.

The Services Australia formula caps the combined child support income at 2.5 times Male Total Average Weekly Earnings (MTAWE), a figure updated annually. Above this cap, additional income is not factored into the standard formula calculation. A parent earning well above the cap can apply through a Change of Assessment process for a departure from the formula, but this requires demonstrating exceptional circumstances. The cap prevents indefinitely escalating payments for very high earners while still ensuring adequate support for the child's reasonable needs.

Both Australia and the UK use administrative formula-based systems, but the formulas differ significantly. The Australian formula (Services Australia) considers both parents' incomes and applies a costs-of-children table that varies by income level and children's ages. The UK Child Maintenance Service uses simpler flat percentage rates (12% of the paying parent's gross income for one child, 16% for two, 19% for three or more) applied only to the paying parent's income, with no consideration of the receiving parent's income. This makes the UK formula quicker to calculate but less responsive to situations where the receiving parent earns significantly more than the payer. Australia's formula is more complex but produces results that many parents regard as more equitable because it reflects both households' financial positions. Both systems adjust for shared care, though the specific thresholds and reduction percentages differ.

Yes. Approximately 65% of separated Australian parents manage child support privately outside the Services Australia system (AIFS data). Private arrangements — called "self-managed" or "private collect" — allow parents to agree on any amount and payment method. There are no fees and no government involvement as long as both parents cooperate. However, private arrangements have no enforcement mechanism: if the paying parent stops paying, the receiving parent must apply to Services Australia to register the arrangement and seek enforcement. Parents can also formalise a private agreement by registering it with Services Australia as either a Limited Child Support Agreement (requires both parents to agree on an amount no less than the formula result) or a Binding Child Support Agreement (requires independent legal advice for both parties and allows departure from the formula amount). Binding agreements provide the most certainty but are harder to vary if circumstances change significantly.

If your financial circumstances change significantly — job loss, serious illness, substantial income reduction, or a new dependent child — you can apply to Services Australia for a Change of Assessment. There are ten statutory reasons for a change of assessment, including that your income has fallen, that you have special costs associated with caring for the child, or that the other parent's income or care has changed materially. You can also apply for a Departure Order through the Family Court if the change is significant and cannot be resolved administratively. It is critical not to simply stop paying without applying for a change: unpaid child support accrues as a debt and Services Australia has substantial enforcement powers including intercepting tax refunds, employer garnishment, departure prohibition orders preventing overseas travel, and legal action for recovery. If you are experiencing hardship, contact Services Australia on 131 272 before falling into arrears to discuss what options are available for your situation.