If you are filing a joint return then your spouse having a retirement plan will also limit the deductibility ...
If *you* are covered by a retirement plan:
https://www.irs.gov/Retirement-Plans/2015-IRA-Deduction-Limits-Effect-of-Modified-AGI-on-Deduction-i...
If you are *not* covered but your spouse is:
https://www.irs.gov/Retirement-Plans/2015-IRA-Deduction-Limits-Effect-of-Modified-AGI-on-Deduction-i...
Covered by a retirement plan at work
Make sure the W-2 (s) were entered for the correct spouse. Make sure that the IRA contribution is for the correct spouse. Check your W-2 box 12 also.
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.
