Yes and no. "Deductions" (standard or itemized) do not lower your qualifying income for the Savers Credit. They lower your taxable income for purposes of calculating tax.
"Adjustments to Income" (lines 23-37 of form 1040 or lines 16-21 of form 1040A) do lower your qualifying income. As Critter#2 already indicated, the only adjustment still available to you, for your 2017 tax return, is an IRA deduction.
