You are correct; this is taxable as Other Income, but it is NOT subject to employment taxes. To enter it on your return, follow the instructions below:
Sign into your return and Take me to my return.
Choose the Federal return and the Wages & Income tab.
Scroll down to Less Common Income and Show more.
Choose Miscellaneous Income, 1099-A, 1099-C.
Choose Other Reportable Income and say Yes.
Even though the screen says "Do not enter income reported on Form 1099-MISC", this is where you will enter the description "1099-MISC for Research Study," the amount you received, and who received it.
Thank you for your participation in medical research.
Put in $530 for "other income." Travel reimbursements for medical research are excluded from income. Be sure to keep your travel receipts and reimbursement documents.
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