Methodology

Where the numbers come from

Australia doesn't set car costs in one place. Each state and territory runs its own registration fees, its own stamp-duty rules, and its own penalty schedule, and they're set by different bodies: the state road or transport authority for rego, the state revenue office for duty, and the road authority again for demerits and fines. CTP sits in different hands, priced by licensed insurers in New South Wales and bundled into the rego total in most other states. Fuel prices come from the Australian Institute of Petroleum's weekly reporting, and tolls from the road operators. Every figure we publish is transcribed from the named official schedule that governs it.

How a figure gets onto a page

Nothing is estimated in prose. A number reaches a page only after it's been read off the official table, entered into a dated dataset, and tagged with the source link and the date it took effect. For anything we calculate, such as a rego total or a stamp-duty amount, we go a step further and reconcile our calculator against the state's own official calculator on several test values before the page ships. If our figure and the government's tool disagree, we don't publish until they match. That reconciliation is the difference between quoting a rate and actually computing your cost correctly.

What "current as at" means

Every figure carries a visible stamp: the date the rate was current and the source it came from. That date is the point we last confirmed the number against the official schedule, not the day you happen to be reading. Where a body has already published a future-dated schedule, such as an indexation that starts next financial year, we store both the current and the scheduled rate, show the one in force now, and note when it changes.

How often we refresh

Most rego fees, duty brackets and fine amounts reset on 1 July, when states index them for the new financial year. We treat that as a scheduled full refresh: every affected dataset is re-pulled and re-stamped around the reset, not patched in a panic. Fuel is different, because it moves weekly, so we refresh the capital-city averages from the Australian Institute of Petroleum's Monday publication. Toll schedules and EV incentives are checked on their own cadence, since operators and state programs change them off any fixed calendar.

Rounding follows each state's own rules

Duty isn't calculated the same way everywhere, right down to how the value is rounded. Some states round the dutiable value up to the nearest block before applying the rate; others apply the rate per part of a smaller unit. We follow each state's statute exactly, rounding the way its own legislation and calculator do, rather than imposing one convention across the board. Getting the rounding wrong is how a calculator quietly drifts from the official answer, so we match it deliberately.

Eight jurisdictions, not one fake national table

States don't just charge different amounts; they define things differently. One prices rego by tare weight, another by cylinders, another by emissions. Duty bands, EV concessions and demerit thresholds all vary too. We present each jurisdiction with its own bands and its own labels, and where we compare them we compare like for like. We never force eight different schemes into a single invented national figure that no authority actually publishes.

Revisions and corrections

When a source revises a rate, the change flows through the same path: we re-pull the dataset, the figure updates, and the page is re-stamped with the new effective date. If you think a number is wrong, email [email protected] with the page and the figure you expected. We check it against the official schedule, fix genuine errors promptly, and re-date the page when we do.