Do I enter my contributions in the Traditional IRA in deductions also if I'm entering this amount in line 12b S? Is 12bS amount what employer or employee contributed?

[MargaretL]

No, please do not report 401(k) contributions (reported on your W-2, box 12, D) as a separate entry in Turbo Tax. All you have to do is report W2 data in Turbo Tax exactly as it appears on the form.

The 401(k) plan contributions you elect to make come directly out of your salary. Since the contributions are made with pre-tax dollars, your employer does not include these amounts in your taxable income for the year. At the end of the year, when you receive your W-2 form that shows your earnings, you will notice that your wages subject to federal income tax  (box 1) are lower because of your 401(k) plan contributions (box 12).

Since the contributions are not counted in your taxable income to begin with, you do not take a deduction when you file your return.

Ps. I'm assuming you meant form W-2, line 12, box D, not B...

[kellihelms]

This is box 12, and letter S for simple IRA. The amount listed here is what I contributed then, not the employer?

[dmertz]

The amount of your elective deferrals to the SIMPLE IRA, indicated with code S, will already have been excluded from amount in box 1 of your W-2.  Do not enter the code-S amount anywhere in TurboTax except on TurboTax's W-2 form.  The amount that your employer separately contributed to your SIMPLE IRA account does not get entered anywhere on your tax return.