Technically there is no one law that states that living in a car is illegal, but you might have a hard time parking anywhere.
Local councils almost all state that camping in car parks is not okay, and the police will be called to issue a move-on direction. You can technically live in your car in campgrounds and caravan parks as long as you pay the permit fees.
Living in your car is generally considered illegal in;
- New South Wales
- Australian Capital Territory
- South Australia
- Western Australia
- Northern Territory