Why does my tax amount not change after I put in the information for my wife's ROTH IRA investment?

[SweetieJean]

A Roth is never deductible.  But its earnings are taxfree.

If your income is low enough, though, it might qualify for the Retirement Savings Credit.

https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-savings-contributions-save...