First let's clear up the terms registration and relicensing as most of us refer to our responsibility to relicense our vehicles as paying the registration or the more commonly used term, the "rego".
The registration, however, refers to the vehicle itself and is in fact what identifies a person as being legally responsible (not the legal owner) for their vehicle.
The relicensing is the regular payment we make to the authorities that allows us to use our vehicles on public roads. We normally only need to worry about the registration process when a vehicle is sold, as the registered owner is responsible for their vehicle and for meeting the requirements that allow them to drive legally on the road. This includes keeping the vehicle roadworthy, and paying the licensing fees and any outstanding traffic or parking infringements.
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Bear that in mind if/when you sell your vehicle. Making sure the change of ownership papers are filled out correctly and posted will ensure you don't cop any future motoring infringements, among other things, caused by the new owner. It's ongoing licensing fees that we receive reminders about, not the registration.