Child support in Australia — quick overview
Child support is governed mainly by the Child Support (Assessment) Act 1989 and the Child Support (Registration and Collection) Act 1988. Services Australia administers the scheme, including assessments, collections and enforcement. Most parents either:
- apply for an administrative assessment (the default), or
- make a child support agreement (Limited or Binding) to set different terms.
The right path depends on care arrangements, incomes, the children’s needs, and how much certainty and flexibility each parent wants. If you’re unsure which option suits your situation, comparing them side-by-side first usually saves time and cost.
Important: Laws and rates change regularly. Amounts are indexed annually. The information below is general only. For personalised advice, especially before signing any Binding Child Support Agreement, speak with a family lawyer.
Your options and typical costs
Common pathways to consider
- Administrative assessment via Services Australia
- Limited Child Support Agreement (LCSA)
- Binding Child Support Agreement (BCSA)
- Change of Assessment (if the formula is unfair)
- Private Collect vs Child Support Collect
- Objections, AAT review or court if needed
Indicative costs and timelines
- Initial guidance: often free; community/legal aid may assist
- Private lawyer: $250–$600 per hour (estimate)
- Drafting a BCSA: $1,500–$3,500 per party (typical fixed-fee range)
- Preparing a COA application: $600–$2,500 depending on complexity
- Objection/AAT review: variable; budgeting for several weeks to months
- Assessment setup: usually days to weeks depending on information
Figures are general estimates only and vary by state/territory, complexity and provider.
How child support is calculated
The Services Australia formula estimates each child’s cost and allocates it between parents based on income and care. At a high level:
| Step | What it means |
|---|---|
| 1. Work out each parent’s child support income | Start with taxable income, subtract a self‑support amount and relevant multi‑case allowances. Add together to find the combined child support income and each parent’s share. |
| 2. Determine percentage of care | Care is based on nights or a regular pattern. Services Australia converts care into a care percentage and a cost percentage. |
| 3. Find the cost of children | Using the combined income and the number/ages of children, a legislated table (indexed annually) estimates cost. |
| 4. Calculate child support percentage | Each parent’s cost percentage minus their income percentage gives a child support percentage. A positive result usually pays the other parent. |
| 5. Apply any adjustments | Special circumstances may justify a Change of Assessment (e.g., significant medical, education or travel costs; income not reflected in tax figures). |
Because rates and thresholds change annually, use the official estimator and keep records of actual care. If your income or care pattern changes, tell Services Australia promptly.
Child support agreements
Limited Child Support Agreement (LCSA)
- Must be equal to or higher than the administrative assessment
- Does not require independent legal advice to be valid
- Can be ended after 3 years, by consent, or if assessment changes by a set margin
- Useful for moderate certainty with flexibility
Binding Child Support Agreement (BCSA)
- Can be set above or below assessment
- Requires each parent to receive independent legal advice
- Provides strong certainty (harder to change or end)
- Can include non-periodic payments (e.g., school fees, health cover)
Agreements can include periodic amounts, lump sums, and specific expenses. Precision in drafting matters—poor wording causes disputes later. Always get advice before signing.
Change of Assessment (COA)
Apply for a COA if the standard formula is unfair due to special circumstances. Common reasons include:
- High costs of caring for, educating or maintaining a child’s special needs
- Substantial costs of contact, including travel
- Income, earning capacity or assets not properly reflected in taxable income
- Necessary commitments of a parent affecting ability to support
- A parent’s responsibility for other children or dependants
Be specific and evidence‑based. Attach invoices, medical letters, school statements, care logs and travel records. You can object to COA decisions and seek AAT review. Time limits apply.
Collection, credits and enforcement
How payments are collected
- Private Collect: pay each other directly; keep records and receipts
- Child Support Collect: Services Australia collects and transfers; can enforce arrears
- Non-agency payments may be credited if rules are followed
- Tell Services Australia promptly when care or income changes
Enforcement tools
- Employer deductions and tax refund intercept
- Bank account garnishee and court enforcement of arrears
- Departure Prohibition Orders in serious cases
- International recovery in reciprocating countries
What to prepare for faster child support help
Organise key information in one place. It makes estimates more accurate and reduces back‑and‑forth.
- Current care arrangements (nights per fortnight, rosters, parenting orders)
- Most recent tax returns, payslips, and details of any business or trust income
- Child-related costs: school/childcare, medical/therapy, health insurance
- Travel logs and receipts for contact/visitation costs
- Any existing Services Australia assessment or decision letters
- Draft or signed child support agreement (if any)
- Evidence for COA claims (invoices, reports, statements, care diary)
Child support FAQ
Do I need an assessment before making an agreement?
For a Limited Child Support Agreement you usually need a current assessment and the agreement must be at least equal to it. For a Binding Agreement, an assessment is not strictly required but is commonly used as a reference point.
Can we include school fees or health insurance in an agreement?
Yes. Agreements can specify periodic amounts and particular expenses such as tuition, uniforms, extracurricular activities and health cover. Clarity on what counts, caps, timing and proof avoids disputes.
What if our care pattern changes?
Update Services Australia as soon as possible. Care changes can alter the cost percentage and payable amount. Back‑dating is limited. Keep a care diary and any communications confirming changes.
Can I challenge an unfair decision?
Yes. You can lodge an objection to many child support decisions. If still dissatisfied, you may apply to the Administrative Appeals Tribunal (AAT). Strict time limits apply—seek advice early.
How do international cases work?
Australia has arrangements with many reciprocating jurisdictions for registration and enforcement. Provide details of the child’s residence and the other parent’s location to confirm the correct process.
Need help with child support in Australia?
Get free guidance on your options, approximate payments, and the fastest next step. If you need representation, we can connect you with family lawyers near you.