Yes, he can enter the sub-portion of the registration fees that are property taxes in the Vehicle/Car Registration area. That deduction is independent of what state he is officially a resident of for tax purposes (the software does recognize that people sometimes do have vehicles registered in states other than their own....and lets you put those $$ in to be used ....potentially)
...BUT ....nothing gets used as a deduction until his total itemized deductions entered already, reach-and-exceed his Standard Deduction. IF he is single and no dependents, his itemized deductions would need to exceed $12,550 before any of his itemized deductions would start to have any possible effect.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
