Boosters enter the Australian legal table at four years. They remain useful well after seven. The seventh birthday is the point at which an adult seatbelt becomes a legal option in the national model — not the point at which a booster becomes pointless. Queensland’s five-step test, CREP’s version of the same test, and Transport Victoria’s height discussion (a good adult-belt fit often arriving around 145 centimetres) all push in the same direction: wait until the belt fits the child, not until the calendar fits the belt.
## What a booster is
An approved booster lifts and positions the child so the vehicle’s lap-sash seatbelt lies low across the hips and across the middle of the shoulder. Some boosters are high-backed; some are lower. Some over a stated weight still use a top tether. The AS/NZS 1754 mark still matters. A cushion from a lounge, a second-hand booster with no label, or an inflatable gadget without Australian approval is not a booster in the legal sense.
## What a booster is not
It is not a harness seat. It is not a licence to sit in the front row. Children from four to under seven still face the rear-seat rule in vehicles with two or more rows, unless every rear position is already taken by younger children in approved restraints. It is also not a workaround for a lap-only belt. If the vehicle seating position has no sash, you need a different seating position or different advice from a fitter — not a hopeful boost.
## Leaving the booster
Use the five-step test. The child should sit all the way back, bend the knees over the front edge of the vehicle seat, wear the lap belt on the hips, wear the sash on the mid-shoulder, and stay in that posture for the whole trip. One failed step is a reason to keep the booster.
If you are buying, prefer a booster that still shows a clear Australian mark, a date stamp, and an instruction book. Search recalls. Then have the first install looked at, especially if the booster uses a tether or a lock-off.
This page is general information for Australian readers. It is not safety advice, a product ranking, or a fitting service. Always read the restraint label and the manufacturer instructions, confirm the current rule with the road agency in the state or territory where you are driving, and have the finished install checked by an authorised fitter.
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High-back and low-back, without a ranking
A high-back booster can help sash geometry in a car whose seats are low or whose sash anchors are awkward. A lower booster can be lighter to move between cars. Neither fact makes one type the safest booster in Australia. The fact that matters is whether the belt lies on the hips and mid-shoulder for this child in this seating position.
Tethered boosters
Some boosters still use a top tether. If the label shows a tether, use the tether. If a seating position has no anchorage, that position is the wrong place for that booster. Do not tie a tether to a luggage hook and call it Australian practice.
Sleeping on a booster
A child who slumps into the door on a long night drive may fail step five of the adult-belt test even if they passed it at 10 a.m. That is a reason to keep a high-back booster longer, or to plan a break, not a reason to tuck the sash under an arm.
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A longer reading path from this hub
If you arrived here from search, stay long enough to open three other URLs: the ages and stages table, your state page, and either installation or buying depending on whether the seat already exists. That triangle — stage, jurisdiction, physical install or purchase — is the whole method of this site.
People bounce because they wanted a product name. Product names go stale, get recalled, and fail to fit a particular bench. Official sentences last longer. Transport for NSW, Transport Victoria, Queensland TMR, the other road agencies, CREP, Kidsafe and the ACCC already wrote the sentences that matter. Our job is to put them in an order a tired adult can follow, and to refuse the extra sentences that would make this domain look like a shop.
If you are choosing a seat, the order is mark, stage, vehicle, optional CREP, recall search, fitter. If you are using a seat, the order is book, mode, tether, harness, fitter. If you are travelling, the order is the state you will stand in, the vehicle you will actually occupy, and a plan that does not involve sharing a belt.
Stay on the page until you can say those orders out loud. Then leave and do the physical thing. A hub that only produces more tabs has failed.
Related reading sits at the bottom of the template on purpose. Use it. Internal links are how a rebuilt heritage domain keeps old backlinks honest.