Can i find the section that tells me how much my taxes will reduce if my wife opens a ROTH IRA?

[Anita01]

Her tax will not reduce at all.  Roth contributions are not deductible, only traditional IRAs

[Anita01]

The tax on your return will not reduce at all since a ROTH contribution is not deductible

[SweetieJean]

It might if OP qualifies for the Retirement Savings Credit.