Get your taxes done using TurboTax

The new senior deduction is not added on to the Standard Deduction.   On a joint return the phaseout is calculated separately for each person, so the 6% phases out for each person. This deduction is intended to provide tax relief for seniors and is in addition to the existing standard deduction or your itemized deductions.  It is calculated on 1040 Schedule 1-A.   Here is a spreadsheet I made.