A "personal property tax" on your car is not all that common. That's because most things that people think of as car taxes are actually ad valorem taxes, that is, taxes based on the value of the vehicle. Well, to be clear, a car registration tax has to be an ad valorem in order to be deductible (I did not mean to imply that most car registration taxes are deductible, only the ones based on the value of the car - and this varies from state to state).
A "personal property tax" is a levy imposed on a person’s property. The tax is levied by the jurisdiction where the property is located, and it includes tangible property that is not real property. In other words, it could be on any asset you have that is not real property. So this is different from the annual vehicle registration, and this is why TurboTax says that it is not that common.
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