Unfortunately, you can't claim personal property taxes you paid in 2017 on your 2018 tax return.
You'd need to claim this deduction on your 2017 tax return. If you've previously filed your 2017 return, you can amend that return to claim these taxes.
Please see the
TurboTax FAQ "How do I amend a 2017 return in TurboTax?" for
additional information.
https://ttlc.intuit.com/replies/6603004
