Make sure that you have not reported any contributions made through your employer as being personal contributions. All contributions made via your employer, reported with code W in box 12 of your W-2, are deemed to be employer contributions because your employer excludes these from the amount in box 1 of your W-2. Enter amounts shown in box 12 of your W-2 only in box 12 of TurboTax's W-2 form, nowhere else in TurboTax.
