Child Support Agency Australia: What It Is and How It Works [2026]
Most Australians still refer to 'the Child Support Agency' or 'the CSA' — but the organisation officially became part of Services Australia over a decade ago. Whether you call it the CSA, Child Support, or Services Australia, it's the same government body responsible for managing child support assessments, collections, and enforcement across Australia.
What Is the Child Support Agency?
The Child Support Agency (now the Child Support program within Services Australia) is the federal government body responsible for:
- Assessing how much child support should be paid using the official 8-step formula
- Registering private child support agreements
- Collecting child support payments from paying parents
- Transferring payments to receiving parents
- Enforcing payment obligations when parents don't pay
- Managing changes of assessment when circumstances change
Child support is a federal scheme — the same rules and the same formula in every state and territory.
CSA vs Services Australia: What's the Difference?
Services Australia is the broader government agency delivering Centrelink, Medicare, and child support. The child support program sits within Services Australia with its own staff and contact lines. For practical purposes, when dealing with child support, you're dealing with Services Australia's child support team — most people still use the old CSA name.
What Can the Child Support Agency Do?
Assessment
Services Australia calculates the official child support amount using the 8-step formula. Both parents are notified and the assessment takes effect from the application date, updating automatically each year when tax returns are lodged.
Collection
Two collection options:
- Private collect: you and the other parent arrange payment directly, but Services Australia can step in if needed
- Child support collect: Services Australia deducts payments from the paying parent and transfers to the receiving parent — recommended where conflict exists
Enforcement
If a paying parent falls behind, Services Australia can:
- Garnish wages — deducting payments directly from the employer
- Intercept ATO tax refunds
- Deduct from bank accounts
- Cancel or refuse passports
- Issue Departure Prohibition Orders — preventing a parent from leaving Australia
- Commence court proceedings for serious non-compliance
Change of Assessment
Either parent can apply if the standard formula doesn't fit their circumstances. See our Change of Assessment guide for the 10 grounds.
How to Register for Child Support
- Create or log in to your myGov account at my.gov.au
- Link your myGov account to Child Support
- Apply for a child support assessment online
- Services Australia contacts the other parent
- An assessment is issued — typically within a few weeks
The assessment takes effect from the date you apply. There is no backdating.
What Information Does the Agency Use?
Services Australia uses income information directly from the ATO. You don't need to provide payslips. A parent can't refuse to provide income information — Services Australia gets it from the ATO regardless.
If a parent hasn't lodged a tax return, Services Australia uses the previous year's income. If they believe income is being understated, they can apply a notional income based on earning capacity.
Dealing With the Agency: Practical Tips
- Keep records of everything. Document every communication — dates, times, what was said, reference numbers.
- Respond to correspondence promptly. Services Australia sets deadlines — typically 28 days to respond to a Change of Assessment or objection.
- Use myGov for everything you can. Most interactions can be done through myGov, creating an automatic documented record.
- Know your objection rights. If you disagree with a decision, you have 28 days to lodge a formal objection. If unsuccessful, you can appeal to the Administrative Appeals Tribunal (AAT).
Contact Details
| Service | Contact |
|---|---|
| Child Support general enquiries | 131 272 (Mon–Fri 8am–8pm) |
| International callers | +61 3 6222 3455 |
| myGov online access | my.gov.au — link to Child Support |
| Interpreter service | 131 202 (available during business hours) |
Frequently Asked Questions
Is the CSA still operating?
The Child Support Agency was absorbed into Services Australia in 2011. The program continues under the same model — only the name changed.
Do both parents have to agree to use Services Australia?
No. Either parent can apply for an assessment unilaterally. The other parent is notified but can't prevent it.
Can Services Australia force the other parent to pay?
Yes — wage garnishing, ATO intercepts, bank account deductions, passport cancellation, and court proceedings are all available.
How long does a child support assessment take?
For straightforward cases, 2–4 weeks from application. Complex cases take longer.
Can I use a private agreement instead?
Yes. A Limited or Binding Child Support Agreement can replace a Services Australia assessment if both parents agree. See our private agreement guide.
What does 'private collect' mean?
Parents manage payment directly between themselves. Services Australia knows about the arrangement and can step in if a parent stops paying.
Calculate Your Assessment Amount
Use our free calculator to see what the Services Australia formula would produce for your situation before you apply.
Use Free Calculator