Are You Owed Child Support? How to Check If Services Australia Got It Wrong

If you've ever stared at your child support statement and thought "that doesn't look right", you might have been onto something. A recent investigation by The Guardian dug into how Services Australia handles child support assessments, and what it found should make every separated parent sit up and check their own file. In short: the agency hasn't always been applying the law correctly, and that means some parents have been underpaid for months, even years, without ever knowing it.

I know, I know. Another thing to add to the list between school drop off, packing lunches and trying to make the grocery budget stretch past Wednesday. But this one is worth twenty minutes of your time, because we're not talking about small change. For some families, the gap between what should have been paid and what actually landed in their account runs into thousands of dollars.

What the report actually found

Strip away the jargon and here's the plain English version. Child support in Australia is meant to be calculated using a formula that takes into account both parents' taxable incomes, the number of nights each parent has the kids, and a few other factors like whether either parent supports other children. It sounds straightforward, but the formula relies on Services Australia having accurate, up to date income information for both parents.

The Guardian's reporting found that in a number of cases, Services Australia wasn't updating assessments when it should have, wasn't chasing up accurate income details from the paying parent, and in some instances was applying outdated or estimated figures for far longer than the rules allow. When a paying parent's income goes up (say they get a promotion or change jobs and start earning $85,000 instead of $65,000) the assessment is supposed to be updated to reflect that. If it isn't, the parent receiving support keeps getting paid based on the old, lower income, sometimes for a long stretch of time.

There were also cases where parents who were self employed or had complicated income structures (think tradies who invoice through a company, or someone with a side hustle on Airtasker or a rental property) weren't having their full income captured properly. The formula is only as good as the data going into it, and if Services Australia isn't verifying that data properly, the parent raising the kids day to day can end up short.

Why this actually matters for your grocery budget

Let's put this in real terms. If you're a single mum with two kids and your ex's income was supposed to be reassessed after a pay rise but wasn't, you could be missing out on $50, $80, even $150 a fortnight. That's not pocket money. That's the difference between doing a proper Woolies shop and scraping together whatever's left in the pantry by Thursday. That's swimming lessons, or the excursion money for school camp, or petrol to get to work.

Cost of living hasn't exactly been gentle on any of us lately. Rent's up, insurance is up, even a loaf of bread and a block of cheese at Coles feels like it costs more than it did two years ago. Child support is meant to be one of the more predictable parts of the household budget. If it's wrong, and has been wrong for a while, that's real money that should have gone towards raising your kids and didn't.

How to check your own case

You don't need a lawyer to do this first bit. Here's where to start.

• Log into your Child Support online account through myGov. Look at your current assessment and check the date it was last updated. If it hasn't changed in over 12 months and you know (or suspect) the other parent's income has changed, that's a red flag.
• Compare the income figures used against reality. The assessment should show the taxable income being used for each parent. If you know your ex got a new job, a pay rise, started a business, or picked up regular overtime, and the figure on your assessment doesn't reflect that, something's off.
• Check whether the assessment is based on an actual tax return or an estimate. Services Australia sometimes uses a "provisional" income figure when someone hasn't lodged their tax return. These are meant to be updated once the real figure comes through from the ATO. If your ex hasn't lodged a return in a while, ask yourself whether Services Australia has actually chased that up.
• Look at the care percentage. If the nights the kids spend with each parent have changed (more time with you during school terms, less during some holidays, or a shift after a new parenting arrangement) but the assessment still reflects the old care split, that will throw the whole calculation out too.
• Check the effective dates of any changes. When Services Australia does update an assessment, it's supposed to backdate it to when the change actually happened, not just from the date they got around to processing it. If there's a gap between when you notified them of a change and when it was applied, you may be owed the difference.

If any of this feels overwhelming, you're not imagining it. The system isn't built for easy reading. But even just logging in and screenshotting your assessment history is a solid first step.

How to request a reassessment

If you've spotted something that doesn't add up, don't just fire off an angry message and hope for the best. Be specific.

Call Services Australia's Child Support line (not the general Centrelink line, the dedicated child support number) and ask directly for a "Change of Assessment" or ask them to review the income being used. Have these ready before you call:

• The date you believe the other parent's income or circumstances changed
• Any evidence you have (this could be as simple as a LinkedIn update, a payslip you've seen, knowledge of a new job or business, or even public information like an ABN registration)
• Your case reference number
• A clear, calm summary of what you think went wrong and what you want them to check

Ask them to confirm in writing (an email or a letter, not just a phone note) what action they're taking and by when. Services Australia has service standards they're meant to meet, and having a paper trail matters if you need to escalate later.

If they tell you the assessment is correct but you still think it isn't, you can formally apply for a Change of Assessment through the online portal or by lodging a form. This triggers a proper review where both parents' financial situations get looked at again. It can take a few weeks, sometimes longer, so don't expect an overnight fix. But it's the mechanism that actually forces a fresh set of eyes on your file.

What to do if you think you've been underpaid

This is where it gets a bit more serious, and where the Guardian's reporting becomes really useful, because it shows this isn't a one off glitch. It's a pattern.

If a reassessment confirms that the wrong income or care arrangement was used, ask specifically whether the correction will be backdated. This matters enormously. A correction that only applies going forward means you've still lost out on everything owed to you in the past. You want the amount recalculated from the date the change should have taken effect, with any shortfall paid to you as a lump sum or arrears payment.

If Services Australia won't backdate the correction, or you feel like you're being fobbed off, you have a few options:

• Lodge a formal complaint with Services Australia. This goes through their complaints process, separate from the everyday phone line, and creates a record that can be escalated.
• Contact the Commonwealth Ombudsman. If you've gone through the internal complaint process and aren't satisfied, the Ombudsman can investigate whether Services Australia has handled your case properly under the law. This is a free service and doesn't require a lawyer.
• Ask about the Administrative Review Tribunal (formerly the AAT). For more serious disputes, particularly around Change of Assessment decisions, you can apply for an external review.
• Get support from a community legal centre. Many offer free advice specifically on family and child support matters, and can help you word a complaint or application properly.

The system relies on parents chasing up errors themselves. It shouldn't, but that's the reality right now, so a bit of persistence really can pay off, sometimes literally.

A few practical things while you wait

Keep a simple file, digital or a manila folder shoved in the filing cabinet, with every piece of correspondence, every phone call date and reference number, and copies of your assessments over time. If this drags on, that record will be gold.

Don't be afraid to call back if you haven't heard anything within the timeframe you were given. Systems like this run on squeaky wheels, unfortunately, and a polite but firm follow up call every couple of weeks keeps your case from sliding to the bottom of the pile.

And talk to other mums in your circle, whether that's the school gate, a local Facebook group or family. If your assessment was wrong, there's a good chance someone you know has hit the same issue. Comparing notes helps you know what's reasonable to push for, and honestly, it just feels better to know you're not the only one who's had to fight for money that was always meant to be yours.

This isn't about being difficult or making things harder than they already are post separation. It's about making sure the formula that's supposed to protect your kids' financial support is actually being applied the way the law intends. Twenty minutes checking your account today could mean real money back in your pocket, and that's worth doing.