The registration fee tax deduction varies from state to state, so always check with your state's DMV website to determine how they calculate their tax.
The total amount of your registration fee is not deductible, just the
portion that the state charged you for taxes based on the value of your
vehicle.
According to the link below, you would use the amount listed for the Vehicle License Tax.
http://www.dmv.org/az-arizona/car-registration.php#Arizona-Registration-Fees
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