According to the IRS you may not be able to deduct all of your traditional IRA contributions if you or your spouse participates in another retirement plan at work (please see IRS Retirement Topics - IRA Contribution Limits for details). Therefore, if you did not participate all year then you will be able to deduct all of your traditional IRA contribution.
If neither you nor your employer contributed to the 401k then you might want to ask why the retirement plan in box 13 is checked.
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