Anything you paid in 2018 no matter what year it was for.
State and local taxes paid are:
-any state withholding from your paychecks, retirement checks, unemployment checks, etc.
-a state tax due (for any year) you paid last year
-any state estimated tax payments you made during year including an overpayment applied from last year
-any local taxes withheld on your checks like SDI in box 14 or 19 on your W2
