With Commissioner for Consumer Protection Anne Driscoll
People who sell cars on a regular basis need to hold a motor vehicle dealers' licence. In fact, the law says that if you sell more than four cars a year you may be asked to substantiate why you do not hold a dealers licence.
If it is purely for personal use and is not connected to running a de-facto business buying cars privately and then on-selling them privately is accepted but it may not make the vehicle seller exempt from the law, which applies to backyards as well as car yards.