You should report that as "Other Income". To do so in TurboTax Online:
- Click on Search and type in "Form 1099-MISC"
- Click on "Jump to form 1099-misc"
- Answer Yes to "Did you get a 1099-MISC?"
- Enter the information on your 1099-MISC. The amount you received should be in Box 3.
- Give a description - For example "Clinical Study"
- On the next screen mark the radio button to indicate that you "...were in a research study and this was the payment." Then indicate No, that you did not perform a service.
- This will add your income to Form 1040, Schedule 1, Line 10 as "Other Income".
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