In this guide(9 sections)
Money and the kids — two of the hardest things to untangle after a separation, and child support sits right where they meet. It's an area that breeds a lot of worry and a lot of misinformation, so let's clear it up calmly. The good news for most people: the basics are handled by a government formula, it's free to set up, and you may not need a lawyer at all. The trick is knowing when you do. Here's how it really works, in plain English — and if your situation has a wrinkle in it, that's exactly what a free chat is for.
At a glance — child support in Australia
| Who runs it | Services Australia (the Child Support program) |
| The law | Child Support (Assessment) Act 1989 (Cth) |
| How it's set | A formula based on both incomes, the cost of children, and how much care each parent provides |
| Cost to get an assessment | Free through Services Australia |
| When you need a lawyer | Agreements, "change of assessment", disputes, hidden income, school fees |
| Separate from | Property settlement, and spousal maintenance — different things entirely |
Talk it through with Elisa — free, confidential chat → | Call 03 4328 5084
What child support actually is (and isn't)
Child support is regular money paid by one parent to the other to help cover the costs of raising their children after separation. A few things it's not, because people mix these up all the time:
- It's not the same as your property settlement — that's dividing what you owned together.
- It's not spousal maintenance — that's support for an ex-partner, not the kids.
- It's not decided by a court in most cases — it's worked out by a government formula run by Services Australia.
It's its own separate thing, with its own system. Which is actually good news: it means you usually don't need to fight about it.
How the formula works (the plain-English version)
Services Australia uses a formula, and while the detail gets technical, the logic is fairly sensible once you see it:
- Work out each parent's income. They take each parent's taxable income and subtract a "self-support amount" — a set figure that's there because each parent needs to live too.
- Add the leftover incomes together to get the combined child-support income.
- Work out the cost of the children. There's a table that estimates what children of a given age cost, based on that combined income. Bigger combined income, higher assumed costs.
- Look at how much care each of you provides. This is the big one (more below).
- Compare each parent's share of income to their share of care. If your share of the income is higher than your share of the care, you pay; if it's the other way around, you receive.
In short: the parent who earns more relative to how much hands-on care they do tends to pay child support to the other. It's trying to share the cost of the kids fairly between two households.
Why the number of nights matters so much
This surprises people. The percentage of care — essentially how many nights a year the children spend with each of you — feeds directly into the formula. More care can mean you pay less (or receive more), because you're already carrying more of the day-to-day cost. It's one reason parenting arrangements and child support are so tangled together, and why it's worth getting the parenting side sorted thoughtfully rather than fighting over a night here or there purely for the dollars.
The three ways child support gets sorted
1. A Services Australia assessment (the default). Either parent applies, Services Australia runs the formula, and that's your figure. It's free, and for a lot of families it's all they ever need. Payments can be made directly between you ("self-managed") or collected by Services Australia.
2. A child support agreement. If you'd both rather agree your own arrangement — maybe a set monthly amount, or one parent covering school fees or health insurance directly — you can put it in writing. A binding child support agreement is the firmest option, but (like a financial agreement) both of you must get your own independent legal advice for it to stick. A limited agreement is simpler but has conditions and can be ended more easily.
3. A "change of assessment". If the standard formula produces an unfair result because of special circumstances — high costs of caring for a child with a disability, private school fees you'd both committed to, or a parent whose real earning capacity isn't reflected in their tax return — you can apply to have the assessment changed. This is where things get genuinely legal, and where good advice earns its keep.
So when do you actually need a lawyer?
Honestly? For a straightforward assessment — two PAYG incomes, a clear care arrangement — you often don't. Services Australia does it for free, and I'd rather tell you that than sell you something you don't need.
You should get advice when:
- You want a binding child support agreement (you legally need independent advice anyway).
- You're heading into a change of assessment — these are detailed and the outcome really matters.
- You suspect the other parent is understating their income or hiding it through a business or trust.
- Private school fees, health costs or special needs are in the mix.
- Child support is tangled up with a bigger parenting or property dispute and needs to be handled as part of the whole picture.
What does help cost?
Setting up a basic assessment through Services Australia costs nothing. Where a lawyer comes in — agreements, change-of-assessment applications, disputes — the cost depends entirely on what's involved, so I won't pluck a number out of the air. What I will do is give you an honest estimate at the free initial consultation and set the fee out for you in writing before any work starts. If money's tight, ask about Victorian Legal Aid — it may be available. (For the bigger picture on family law costs, the family lawyer cost guide walks through it.)
A word from me
I know how loaded this topic gets — it can feel like the child support figure becomes a stand-in for every other hurt in the separation. Try, where you can, to keep it about the kids and the cost of raising them, not about winning. The families who manage that tend to come through with far less damage, and far smaller legal bills. If you want a steady hand to help you work out what's fair, I'm here — and the first conversation is free.
Frequently asked questions
How is child support calculated in Australia?
Services Australia uses a formula based on both parents' incomes (after a self-support amount), the estimated cost of the children for that combined income, and the percentage of care each parent provides. Broadly, the parent whose share of income is higher than their share of care pays the other.
Do I need to go to court for child support?
Usually no. Most child support is set by Services Australia's formula, not a court. Court only really comes into it for enforcement or where it's wrapped up in other proceedings. Agreements and change-of-assessment applications are handled administratively, not in a courtroom.
Does the number of nights the kids stay with me change what I pay?
Yes. The percentage of care each parent provides feeds directly into the formula, so the care arrangement genuinely affects the dollars. That's one reason it's worth getting parenting arrangements right rather than haggling over single nights.
How much does a child support lawyer cost?
A basic assessment through Services Australia is free and often needs no lawyer at all. Where you'd engage a lawyer — a binding agreement, a change-of-assessment application, or a dispute — the cost depends on the work involved. We give you an honest estimate at the free consultation and confirm the fee in writing before starting.
Is child support the same as a property settlement?
No — they're completely separate. Child support is ongoing money for the children's costs; a property settlement is the one-off division of what you owned together. They're worked out under different rules and shouldn't be confused.
Can we just agree our own child support arrangement?
Yes. You can make a child support agreement — a binding one (which requires both of you to get independent legal advice) or a limited one (simpler, but with conditions). It's a good option where you'd rather set your own terms, such as covering school fees directly.
What if the other parent is hiding their income?
It happens, especially where someone is self-employed or runs things through a company or trust. A "change of assessment" can ask Services Australia to look at a parent's real financial capacity rather than just their tax return. This is one of the situations where getting advice early really pays off.
What's a "change of assessment"?
It's a way to have the standard formula adjusted when it produces an unfair result because of special circumstances — high care costs, school fees, a disability, or income that doesn't reflect a parent's true capacity. There are set grounds for it, and the application needs to be put properly.
At what age does child support stop?
Generally when your child turns 18. But if they're still in their last year of secondary school when they turn 18, you can apply to have it continue to the end of that school year. It can also end earlier if the child marries or starts living fully independently. Support for an adult child — for tertiary study or a disability — is a separate thing you'd apply for specifically.
Do I still pay child support if we share care 50/50?
Possibly, yes. Equal care doesn't automatically mean nobody pays. The formula compares each parent's share of income to their share of care, so if one of you earns more, that parent may still pay something even with equal nights. Equal care plus similar incomes usually means little or nothing changes hands.
What actually counts as "income" for child support?
More than just your salary. It's your adjusted taxable income — which includes taxable income, reportable fringe benefits, reportable super contributions, net investment losses, certain tax-free pensions and any foreign income. It's deliberately broad so a low "taxable income" figure on its own can't be used to dodge support.
Does my new partner's income count?
No. Child support is worked out only on the two parents' incomes. What a new partner earns isn't part of the formula (though it can affect some Centrelink payments separately).
Is child support taxable, or can I claim it on tax?
Neither. If you receive it, you don't pay tax on it. If you pay it, you can't claim it as a deduction. It sits outside the tax system.
Does receiving child support affect my Family Tax Benefit?
It can. Child support you receive is counted under the Family Tax Benefit Part A maintenance income test, so above a certain amount it can reduce your FTB Part A. It's worth looking at the two together rather than in isolation.
What happens if the other parent just doesn't pay?
If Services Australia is collecting for you, they have real teeth — they can deduct payments straight from wages, intercept tax refunds, and take other recovery steps. If you've been managing it privately and the payments dry up, you can switch to Services Australia collection and let them chase it.
Can I stop paying child support if I'm being stopped from seeing my kids?
No — and please don't. Child support and time with your children are completely separate issues in Australia. Withholding support because contact has broken down only hurts the kids and weakens your own position. Treat the parenting problem as a parenting problem — mediation, or a parenting order — and keep paying.
Does child support cover school fees, braces or extracurriculars?
The standard formula is meant to cover the general costs of raising a child, not big extras on top. Private school fees, orthodontics or significant medical costs are usually handled either by agreement between you, or through a change of assessment if you can't agree.
My income just dropped — do I have to keep paying the same amount?
No. If your income falls — you lose your job, your hours are cut — you can lodge an income estimate with Services Australia so your assessment reflects your real situation rather than last year's tax return. The key thing is to get it reassessed rather than simply stopping payments.
How do I actually apply for child support?
Through Services Australia, usually online via myGov. It's free. You'll need both parents' details and information about the care arrangement. Most people start there long before they ever need a lawyer.
What if the other parent lives overseas?
Australia has arrangements with many countries (called reciprocating jurisdictions) to assess and collect child support across borders. It's more involved than a local matter, and it's one of the situations where early advice genuinely saves headaches.
What if the other parent disputes they're the parent?
There are proper steps for that — objecting to the assessment and, where needed, DNA testing or a court declaration of parentage. It needs to be handled carefully and quickly, so get advice if paternity is genuinely in question.
Can child support be paid as a lump sum instead of monthly?
It can, through a child support agreement — for example a lump sum credited against the ongoing liability. It's less common and has to be documented properly, but some families prefer it.
Does having another child reduce my child support?
It can. If you have another child you're legally responsible for (a "relevant dependent child"), that's recognised in the formula and can reduce the income used to calculate support for your first family.
How often is child support reviewed?
Assessments are generally reviewed each year, and the figures are indexed over time. It's also recalculated whenever something material changes — a parent's income, or the care arrangement.
Can a grandparent or other carer claim child support?
Yes. A non-parent carer who has substantial care of a child — a grandparent raising a grandchild, for instance — can apply for child support from the parents.
What's the difference between child support and spousal maintenance?
Child support is for the children's costs and is run by Services Australia on a formula. Spousal maintenance is support for an ex-partner who genuinely can't support themselves, and it's dealt with under the Family Law Act. They're separate — you can have one without the other.
Can I switch between Services Australia collecting and handling it privately?
Yes. You can move between "private collect" (you arrange the payments directly) and Services Australia collection. If private payments become unreliable, switching to agency collection gives you their enforcement powers.
What if the paying parent is self-employed and minimising their income?
It's a common worry where someone runs a business or trust. A change of assessment can ask Services Australia to look at a parent's real financial capacity and lifestyle, not just the figure on their tax return. It's one of the clearest cases for getting proper advice.
Is what I tell you about my child support situation confidential?
Completely. Anything you share with me is confidential and protected by legal professional privilege, so you can speak freely about what's really going on.
Written and reviewed by Elisa Rothschild BA/LLB — Principal Lawyer, Fogarty Oliver Rothschild. Admitted to legal practice in Victoria. Family and property law in Melbourne since 2012.Last reviewed 31 May 2026.
This guide is general information about Australian family law, not legal advice for your specific situation. For advice on your matter, book a free initial consultation.