As you are covered by a retirement plan at work and your MAGI is over $121,000 for a married couple filing jointly, your IRA contribution is not deductible. This is even if the total contributions to your 401(k) and IRA are less than $6,500.
Please read this IRS document for more information:
https://www.irs.gov/retirement-plans/plan-participant-employee/2018-ira-contribution-and-deduction-l...
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