Did you receive a 1099 MISC with an amount in the non-employee compensation box 7?
This needs to be reported on a Sch C in Turbo Tax.
Did you receive a K-1 reporting your share of the income? If not, unless you received a 1099-B or 1099-S it would be considered self-employment income, rather than investment income.
Click the link for detailed info on Reporting Business Income and Expenses.
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