i believe you do not pay stamp duty when transferring a car to your immediate family ie husband to wife, father son, and i think must also have the same address. I believe all you will pay is a vehicle transfer fee like for example 25 bucks for the admin/paperwork at rta with no rwc required. Its only when you sell to an outsider you will need this i believe.

Anyway look it up on your states rta website ie. vicroads for in victoria.