Limited Child Support Agreement | Child Support Act 1989

A limited child support agreement is a formal written arrangement between two parents or carers about the financial support of their children, registered with the Child Support Registrar under the Child Support (Assessment) Act 1989 (Cth). It is one of two private agreement types Australian law recognises. The other is the binding child support agreement, which requires each parent to obtain independent legal advice and can be made for any amount, even below the formula. A limited agreement takes the opposite trade-off: no lawyer sign-off is required, but the annual rate you agree must be equal to or more than the amount payable under the current assessment.

That single constraint shapes everything. Because the agreed figure cannot dip below the formula, Services Australia treats a limited agreement as a way to add certainty and extras on top of the baseline, not a way to reduce a paying parent's obligation. People often confuse this with a purely private handshake arrangement, which involves no registration and no enforcement machinery at all. A registered limited agreement is different: once accepted, the Registrar gives effect to it, and unpaid amounts can be collected through the child support system. If you want flexibility without the cost and permanence of a binding agreement, and you already hold an assessment, this is usually the right instrument. Our family law document templates for Australia are drafted around exactly this distinction so you pick the correct category from the start.

The governing statute is the Child Support (Assessment) Act 1989 (Cth), administered by Services Australia (Child Support) as the office of the Child Support Registrar. Part 6 of the Act sets out how agreements work, and the formal requirements are specific. Section 80E establishes the limited agreement category, while sections 81 to 86A set the general rules for what an agreement must contain and who may be a party. The core formal requirement is plain: a limited child support agreement must be in writing and signed by both parents or eligible carers. Parents can sign one identical document or each sign separate identical copies, and the agreement only takes legal effect once the Registrar accepts it.

Two threshold conditions decide whether the Registrar will accept your agreement. First, an administrative assessment must already be in force at the time your application for acceptance is received, because the assessed annual rate is the floor your agreed payments cannot fall below. Second, a receiving parent generally needs at least 35% care of a child to be entitled to child support under the agreement. Section 84 defines the matters an agreement may deal with, including periodic amounts, lump sums credited against liability, and non-periodic items such as school fees or private health insurance, and section 87 confirms a single agreement can cover two or more children.

Termination is where limited agreements earn their name. Either parent may end the agreement without the other's consent once three years have passed, simply by notifying the Registrar. It can also be terminated where a fresh notional assessment shows the child support payable has shifted by more than 15% in a way not contemplated when you signed. A court retains power to set an agreement aside under section 136 in cases involving fraud, undue influence or unconscionable conduct. The authoritative starting point for the acceptance process and the current forms is the Services Australia guidance on limited child support agreements, which sets out exactly what the Registrar checks before an agreement takes effect.

The most common trigger is a wish for predictable payments over a fixed horizon. Parents who have separated amicably often want to know precisely what lands each fortnight for the next few years, rather than watching the figure move every time an income estimate changes. A limited agreement freezes the arrangement while preserving a clean three-year exit, which suits parents who expect their circumstances to settle but not vanish.

Extraordinary expenses drive a second wave of these agreements. The formula assessment covers day-to-day costs, but it says nothing about private school fees, braces, elite sporting programs, or the gap between Medicare and a specialist's actual invoice. When one child is in private education and another is not, parents frequently want those costs carved out and shared on a defined percentage, and a limited agreement is the natural home for that detail. Recording who pays what, and when, stops the quarterly argument before it starts.

Irregular or seasonal income is a third scenario. A tradesperson, a commission earner or a small business owner may find the formula whipsaws their liability, so a stable agreed figure at or above the assessment brings sanity to both households. One edge case worth flagging: if either parent expects to fall below 35% care, the entitlement to child support under the agreement can drop away entirely, so build in what happens if care percentages shift. Parents blending finances after a new relationship also use these documents alongside a broader separation record. If your situation reaches into property or superannuation, our separation and financial agreement resources sit next to this one in the same category.

• The identification of the parents and children names each parent by full legal name and lists every child the agreement covers, with dates of birth, because section 87 lets one agreement span multiple children and the Registrar needs each child clearly identified. Vague references to "the kids" have no place in a document the Registrar must accept.
• The periodic child support amount states the annual or fortnightly figure in words and numbers, expressly confirmed to be equal to or more than the current administrative assessment. This is the clause the Registrar scrutinises first, so it references the assessment it sits on top of.
• The indexation clause sets how the periodic amount adjusts over the life of the agreement, typically by reference to a published index or a fixed annual percentage, so payments keep pace without a fresh negotiation each year. Leaving this out is how a fair figure in year one becomes an unfair one by year three.
• The extraordinary expenses clause defines which costs sit outside the periodic amount, private school fees, orthodontic and dental work, private health insurance premiums, and major extracurricular costs, and fixes the sharing ratio and the approval process before a large bill is incurred.
• The duration and review clause records the start date, confirms the three-year minimum before unilateral termination, and sets an optional review point so both parents revisit the numbers deliberately rather than by accident.
• The termination and dispute clause spells out the statutory exit routes, including the three-year notification and the 15% notional assessment shift, and points parents to family dispute resolution before any court step.

Child support is Commonwealth law, so the core of a limited agreement is uniform across Australia. The Child Support (Assessment) Act 1989 (Cth) applies identically whether you live in Sydney or Darwin, and Services Australia administers acceptance nationally. What changes between jurisdictions is the surrounding machinery: the courts that hear disputes, the family dispute resolution landscape, and the state or territory rules on private school enrolment and health that shape your extraordinary expenses.

New South Wales parents deal with the Federal Circuit and Family Court of Australia registries in Sydney, Parramatta and Newcastle for any related property or parenting matters, and NSW has a dense network of accredited family dispute resolution practitioners whose section 60I certificates matter if a dispute escalates. Documenting private school fee obligations carefully is worth the effort given Sydney's private education costs.

Victoria operates a strong Family Relationship Centre network, and Victorian parents often pair a limited agreement with a parenting plan lodged through those services. Where a child attends an independent Victorian school, the enrolment contract usually binds the enrolling parent personally, so your extraordinary expenses clause should mirror who signed the school agreement.

Queensland parents, spread across a large decentralised state, frequently build travel and contact costs into their thinking because changeover distances are real. While those costs are more a change of assessment matter than an agreement term, a well-drafted limited agreement still acknowledges how significant travel interacts with the shared expenses you record.

Western Australia is the important outlier. WA is the only state that did not refer its ex-nuptial family law powers to the Commonwealth, so parenting matters for unmarried parents run through the Family Court of Western Australia. Child support assessment and limited agreements, however, still operate under the Commonwealth scheme, so a WA limited agreement is accepted by Services Australia the same way, even though related parenting orders follow the WA pathway.

You begin by confirming the one precondition that cannot be skipped: an administrative assessment must already be in place, because our form asks for the assessed annual rate that your agreed figure has to meet or beat. From there you enter each parent's full legal details and list every child the agreement will cover, which the template uses to structure the payment and expense clauses correctly. Next you set the periodic amount and choose your indexation method, and the document confirms in plain words that the figure is equal to or more than the assessment so the Registrar has no reason to hesitate.

You then define the extraordinary expenses, ticking the categories that apply, private schooling, medical and dental gaps, health insurance, extracurricular costs, and setting the sharing ratio and the approval step for large outlays. The final stage covers duration, the three-year exit and dispute resolution, after which both parents sign. Once you download in Word and PDF, you lodge the signed agreement with Services Australia using the Child Support Agreement form so the Registrar can accept it. If you also need to record living and financial arrangements, our Australian separation agreement templates complement this one.

The single most damaging error is agreeing a figure below the current assessment. A limited agreement whose periodic amount falls short of the assessed annual rate will not be accepted, so parents who negotiate downward simply waste the exercise and often the goodwill that came with it. Close behind is trying to lodge without an assessment in place at all. The assessment is a legal precondition, not a formality, and the Registrar cannot accept the agreement until one exists. A third frequent slip is treating the document as self-executing: an unsigned or unlodged agreement carries none of the enforcement weight parents assume, because a limited agreement only takes effect once the Registrar accepts it.

Vague expense clauses cause the most day-to-day friction. Writing "we will share school costs" without a ratio, a definition of what counts, or an approval process guarantees a fight the first time a large invoice arrives, so name the expenses and fix the percentages. Parents also forget indexation, leaving a sensible year-one figure to erode in real terms, and they overlook the 35% care threshold, which can quietly extinguish an entitlement if care shifts. Finally, many parents do not realise the three-year clock and the 15% notional assessment rule can end the agreement earlier than expected, so plan for those exits rather than being surprised by them. Where employment income drives the numbers, our Australian employment document templates help evidence earnings cleanly.