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If 1 of them co-signed for the loan, if you live at 1 of their addresses, if you register the car in that parent name AND your name, then your parent has an Insurable Interest in the vehicle and the car can be added to that parent's policy in addition to adding you to the policy as a driver. That will save money. Then when you move out to your own place you get "spun off" the policy, the address gets changed, the registration gets changed to you, and you get the discounts from mom or dad's policy2014 Toyota Rav4 with just over 40k miles. So you're saying I can attach myself and my car to one of my parent's policies (they're separated 15 years now) and lower the price?