Enter it as "Other Common Income" not subject to Self-Employment.
Delete the 1099-misc you entered and re-enter it.
Click Federal
Click Wages & Income
Click “See All Income” if needed
Scroll down (PAST SELF-EMPLOYMENT) to “Other Common Income”
Click “Show more”
Scroll down to “Form 1099-MISC”
Click Start
Enter the 1099-MISC and Continue
On the “Describe the reason for this 1099-MISC” screen type in something like “TDameritrade 1099-misc” and Continue
Select “None of these apply” and Continue
Select “No, it didn’t involve work like main job” and continue through the interview selecting the appropriate answers for a one-time investment payment
The amount from the 1099-MISC will be reported as Other income on the 1040 line 7a, not as Self-employment
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