If you are not covered by a plan, but your spouse is, you get a full deduction if your AGI is under $184,000.
https://www.irs.gov/retirement-plans/plan-participant-employee/2016-ira-contribution-and-deduction-l...
Why not enter the proposed Traditional IRA contribution and see if the benefit is to your liking (Federal Taxes- Deductions and Credits- Retirement and Investment- Traditional and Roth IRA Contributions)? You can take it out if it doesn't have a big enough impact. Obviously, you have mere hours to make the actual contribution for 2016.
