Child Support Private Agreement: What Australian Parents Need to Know

If you're researching a child support private agreement, you're probably trying to avoid the Services Australia process and work things out directly with your co-parent. That's entirely possible — and common. But "private" doesn't have to mean "informal," and the difference matters more than most parents realise.

What Is a Private Child Support Agreement?

A private child support agreement is a legally recognised arrangement between two parents about how much child support will be paid, how often, and by what method. Instead of relying on Services Australia to assess and collect payments, you and the other parent set the terms yourselves.

Done correctly, the agreement is enforceable. Done loosely — just a verbal deal or a text message thread — you have very little protection if things go wrong.

There are two formal types: limited child support agreements and binding child support agreements. They work quite differently.

Limited Child Support Agreements

A limited agreement is the more flexible of the two. You can put one in place relatively quickly, without either parent needing to get legal advice first.

The catch: you must have an existing child support assessment from Services Australia, and the amount in your agreement has to be equal to or greater than that assessed amount. You can't use a limited agreement to pay less than the formula says.

Key facts:

• No legal advice required (though it's always a good idea)
• Requires an active assessment from Services Australia
• Amount must meet or exceed the assessment
• Either parent can end the agreement after three years without the other's consent

The three-year exit clause is what makes this "limited." It gives flexibility, but it also means the paying parent can walk away from the arrangement at the three-year mark if they choose to.

Binding Child Support Agreements

A binding agreement is the heavier-duty option. It can set any amount — above or below what a standard assessment would produce — and it doesn't require an assessment to be in place first.

The requirement: both parents must get independent legal advice before signing, and each lawyer must provide a signed certificate confirming that advice was given. Without those certificates, the agreement isn't valid.

Key facts:

• Legal advice and certificates mandatory for both parties
• Can be set above or below a standard assessment amount
• No expiry date — runs until a "terminating event" (e.g. the child turning 18)
• Very hard to end — requires a new binding agreement or a court order
• Can cover school fees, extracurriculars, health insurance, and other specific expenses

The difficulty in ending it is a feature, not a bug — it gives both parents certainty. But it also means you need to think carefully before signing, because you're committing to terms that could apply for many years.

When Does a Private Agreement Make Sense?

A private agreement works well when:

• Both parents have a cooperative relationship and genuinely agree on the amount
• One parent's income is significantly higher or lower than the formula accounts for
• You want to include specific expenses (private school, health cover, tutoring) that the standard assessment doesn't cover
• You're settling property at the same time and want to lock in child support as part of the overall deal
• You'd prefer direct bank transfers rather than Services Australia collecting payments

The Services Australia administrative assessment is the right starting point when communication between parents is difficult, when there's a risk of non-payment, or when one parent might try to manipulate their income figures.

The Risks of Keeping It Informal

Some parents shake hands on an amount and never formalise it. That's understandable — it's quick and avoids legal fees. But informal arrangements carry real risk:

• No enforcement mechanism. If the paying parent stops, you have no legal basis to recover anything.
• No paper trail. Disputes about what was agreed become your word against theirs.
• FTB complications. If you receive Family Tax Benefit Part A, Centrelink expects you to take reasonable action to obtain child support — an informal deal may not satisfy this requirement.
• Courts are cautious. If you later apply for enforcement of an informal agreement, the court has wide discretion and will consider whether you pursued your rights promptly.

Formalising the arrangement costs money upfront. Not formalising it can cost far more later.

What Happens if Circumstances Change?

Life changes — incomes shift, kids move schools, care arrangements change. Here's how each agreement type handles that:

Limited agreements can end automatically if either parent's income changes by more than 15% from the original assessment, or after three years on notice. That can be a problem or a relief depending on which side you're on.

Binding agreements are deliberately hard to change. You need either a new binding agreement (requiring fresh legal advice from both parties) or a court order. The court will only set one aside in exceptional circumstances — financial hardship alone generally isn't enough.

If your situation is likely to change in the next few years, factor that into which type of agreement you choose.