Will contributions to an IRA appear on form W-2?

[VolvoGirl]

No.  Only contributions to a 401k plan at work.  Only enter 401k contributions from the W2, nowhere else.  A 401k is not an IRA.  You contribute to a IRA outside of work with your own money.  

[dmertz]

If the employer plan is a SIMPLE IRA plan, your employee elective deferrals will be shown in box 12 with code S and will be excluded from the amount in box 1.  Employer contributions are not reportable on Form W-2.

Employee contributions to other types of non-IRA-based plans are shown with different codes in box 12.

Enter amounts shown in box 12 of your W-2 only in box 12 of TurboTax's W-2 form, nowhere else in TurboTax.