$6500 is the limit for deductible contribution to a traditional IRA in 2018 for individuals 50 years old or older. Are you entering the contribution as part of business section (shows up on the Keogh/SEP/etc worksheet), or the personal section (shows up on the IRA worksheet)? In step-by-step for “personal”, TT asked me about contributions to “Traditional IRAs”. I answered (correctly, IMO, since SEP IRAs *are* considered traditional IRAs) with the amount I contributed to my SEP IRA, and this caused TT to apply non-SEP limitations, and create a form 8606 for non-deductible contributions. The solution was to enter 0 in that section. The AGI reduction should show up on your schedule 1 as a SEP adjustment, not an IRA deduction.
