a separate return, check box in spouse column, if applicable". Does 401K contribution needs to be acknowledged on this traditional IRA worksheet?
The line 10 check box has nothing to do if you have made contribution or not. A 401(k) in box 12 on a W-2 is NOT an IRA and does not get entered anywhere else.
That box will be checked if:
TurboTax makes that determination if any of the following are true:
1) Box 13 (retirement plan) on your (or spouses) W-2 is checked,
2) Box 12 on your (or spouses) W-2 contains codes D, E, F, S, or AA/
3) You answered “yes” to the “Are you covered by a Retirement Plan at work” in the interview.
4) You have a self-employed retirement plan.