@wdeatrick
Note that any discussion thread on this forum with the date of June 2019 is probably several years older than that. The June 2019 date is when all posts from the old forum software were moved to this new software.
The personal property tax that Virginia counties charge based on the value of the vehicle is certainly a deductible state and local tax on your federal tax return. It is subject to the same SALT cap of $10,000 that applies to all state and local taxes (real property taxes, income or sales tax, and personal property tax). I had no problems entering this tax deduction on my 2020 tax return.
The instructions for form CA-540 part 2 California adjustments to itemized deductions, indicate that you should copy your federal schedule A line 5a, 5b, and 5c in the column A of the form. That is your state and local income tax (5a), property tax (5b), and personal property tax (5c). Then, the instructions say for line 5a that California does not allow a deduction for state and local income taxes so you enter the same amount as a California subtraction in column B. The instructions are silent as to line 5b and 5c, which I take to mean that your Virginia real property tax and personal property tax will be deductible on your California return, since no California adjustment is called for.
https://www.ftb.ca.gov/forms/2020/2020-540-ca-instructions.html#Specific-Line-Instructions
Of course, TurboTax will do this for you.
