When buying a car in Australia, you will need to provide the following documents: Proof of identity: You will need to provide a valid government-issued photo identification, such as a driver's license or passport. Proof of address: You will need to provide a document that confirms your current residential address, such as a utility bill or a bank statement. Vehicle registration: The seller should provide the vehicle registration certificate or a transfer form. Roadworthy certificate: If the car is more than five years old or has changed ownership, a roadworthy certificate issued by an authorized mechanic is required. Transfer of ownership form: The seller and the buyer should complete and sign the transfer of ownership form to transfer the ownership of the vehicle. Insurance: You will need to have proof of insurance coverage for the vehicle. Payment: You will need to provide payment for the purchase, either by cash, bank transfer, or any other agreed-upon payment method. It is important to note that the exact documents required may vary depending on the state or territory in which the car is being purchased. Therefore, it is advisable to check the specific requirements for the state or territory in which the transaction will take place.