Car stamp duty calculator for WA
Perth buyers consistently underestimate this cost, and the reason is structural rather than careless — every other state most people have lived in charges a flat percentage, so a flat percentage is what gets budgeted. Below is what WA charges, worked out from the rates the state revenue office publishes, along with a calculator so you can check your own figure before you agree to anything — because duty is the on-road cost people most often forget to include in the amount they finance.
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Set the price you expect to pay. Duty is charged on the dutiable value, which is the higher of what you paid and what the vehicle is worth — so a generous discount does not always reduce it.
Stamp duty on a car in WA
Registration duty is the largest on-road cost after the car itself, and it is the one buyers most often forget to include in the amount they finance.
Sliding scale between $25,000 and $50,000 — this vehicle sits at 4.25%.
Estimate only, based on the rates published by the WA revenue office and checked on 26 August 2026. Duty is charged on the dutiable value, which is the higher of what you paid and the market value. Concessions and exemptions are not modelled here, and registration, CTP and transfer fees are separate costs on top.
Finance the drive-away price in PerthWestern Australia uses a sliding scale, and the rate itself climbs
This is the one that catches people, particularly anyone who has moved here. WA does not apply a flat percentage. Up to $25,000 it is 2.75%. Between $25,000 and $50,000 the percentage itself rises with the value, so duty climbs faster than the price does. Above $50,000 it is 6.5%.
The result is that WA is materially more expensive than the eastern states at the same price. A $50,000 car attracts about $3,250 in duty here, against roughly $1,600 in New South Wales — a gap of $1,650 on the same vehicle.
What it looks like at each price
The figures below come from the same rules the calculator uses, checked against the WA revenue office on 26 August 2026.
| Vehicle price | Duty |
|---|---|
| $15,000 | $413 |
| $25,000 | $688 |
| $35,000 | $1,488 |
| $45,000 | $2,588 |
| $55,000 | $3,575 |
| $70,000 | $4,550 |
Calculated from the rates published by the WA revenue office and checked on 26 August 2026. Estimates only — concessions and exemptions are not modelled, and registration, CTP and transfer fees are separate costs on top.
Why it matters in Perth
Perth buyers consistently underestimate this cost, and the reason is structural rather than careless — every other state most people have lived in charges a flat percentage, so a flat percentage is what gets budgeted.
Western Australia does not work that way between $25,000 and $50,000. The rate itself rises with the value, which means the duty on a $40,000 car is not simply twice the duty on a $20,000 one. It is closer to four times it.
If you are buying interstate to get a better price, this page is the one to read twice. Duty is paid where the vehicle is licensed, not where it was bought, so a bargain in Melbourne still attracts Western Australian duty when you license it here — on top of the transport and an inspection you cannot attend.
Common questions
How much is stamp duty on a car in WA?
On a $30,000 car it is around $1,050, and on a $50,000 car around $3,250. Sliding scale between $25,000 and $50,000 — this vehicle sits at 3.50%. Duty is charged on the dutiable value, which is the higher of what you paid and the market value, so a discount does not always reduce it. These are estimates from the published rates rather than a quote.
Can I include stamp duty in my car loan?
Usually, yes, and it is common. It becomes part of the amount financed and attracts interest for the full term like anything else in the loan. Raise it before the loan amount is set rather than after — adding it late means reworking the contract.
Do I pay stamp duty on a private sale?
Yes. Duty is payable on the transfer of registration regardless of whether you bought from a dealer or a private seller, and it is calculated on the dutiable value in the same way. It is worth budgeting for at the same time as the PPSR check.
Does buying interstate avoid the duty?
No. Duty is paid where the vehicle is registered, not where it was bought. A cheaper car interstate still attracts WA duty when you register it here, and you have added transport and an inspection you cannot attend. Sometimes it is still worth it — just build all three costs into the comparison.
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