As SweetieJean said above, the sales tax deduction was in TurboTax last year. (Her earlier answer was about the current delay in EITC/ACTC refunds, imposed by the same PATH Act that made the sales tax deduction permanent.) You *can* use TurboTax to amend your 2015 return if necessary, but more than likely *IF* you qualify you already claimed it. (And given all the caveats for the sales tax deduction, I seriously doubt most people would get a $1,900 refund.)
