What does "Enter the amount, if any, attributable to this trade or business only" mean as the follow-up item to the total SEP IRA contribution amount I have entered?

[leemeredithpears]

TT is asking me to check this entry. I entered my SEP IRA contribution correctly and it appears in the line "Total from the Keogh, SEP and SIMPLE Contribution Worksheet for the owner of this trade or business". But TT is asking me to make an entry to "Enter the amount, if any, attributable to this trade or business only." At the top of the screen it says "Keogh SEP contribution must be entered, with a box for me to enter "Keogh SEP contribution". I'm confused because the box at the top of this Check Entry screen is different from the highlighted box in the form itself. What should I be entering here? Self employed with no employees. Do I enter the full contribution as attributable to this trade or business only?

[dmertz]

TurboTax is apparently asking in in regard to determining how much of a self-employed health insurance deduction is permissible.  If this is your only self-employment business, enter the enter amount of your SEP contribution.

The total of the deductible portion of self-employment taxes, your SEP contribution and your self-employed health insurance deduction is not permitted to exceed your net profit from self-employment.

[leemeredithpears]

Thanks. It is not my only self employment business, but it is the business that earns 95%+ of my income. Should I still enter the full amount?

[dmertz]

If all of the self-employment income is reported on a single Schedule C enter the entire SEP contribution.  If you've created separate Schedules C for your separate businesses, made the maximum SEP contribution based on the combined profit and are claiming the self-employed health insurance deduction with respect to the business that produced 95%+ of the profit, enter only 95%+ of your SEP contribution.

(With sufficient net profit, it probably doesn't matter what you enter.  If entering 100% of your SEP contribution does not limit your self-employed health insurance deduction to less than the amount of your insurance premiums, you can just enter 100% of your SEP contribution.)