If you did not receive a 1099-R or a 1099-Misc for this income, you can list it under 'Other Taxable Income'.
Here's how to do that:
Select Federal Taxes, Wages & Income, I'll Choose What to Work On.
Scroll to Less Common Income, and select Miscellaneous Income, Scroll to Other Reportable Income.
YES to Other Taxable Income. Enter a Description and Amount (screenshot).
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