Short answer: there isn’t one universally “cheapest” state to buy a car in Australia—your total hit depends on stamp duty, rego, CTP and dealer delivery.
Big markets like Sydney and Melbourne can deliver sharper sticker prices on used cars, but NSW and VIC often sting harder on duty for pricier vehicles. The ACT can be very friendly to low- and zero-emission cars thanks to duty concessions and rego breaks, while TAS and QLD can be competitive on smaller, cheaper cars. WA uses a tiered duty that’s kind to budget runabouts but climbs with vehicle value; SA sits somewhere in the middle.
Buy interstate and you’ll usually cop transfer fees, re-stamping in your home state, travel/transport, and maybe an inspection—those “savings” can evaporate faster than a servo pie in January. Cross-shop nationally for price, then run each state’s on-road cost calculators before you commit to see your real bottom line.

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