Yes, this is taxable (but not as self-employment).
How you report it would depend on how they reported it, usually it is reported on a 1099-MISC.
If you have no formal tax form, enter it as "Other Income".
DESKTOP
In the desktop
program, start or open your return
Click FEDERAL
TAXES
Click Wages
& Income
Click "I'll
choose what to work on" if needed
Scroll down to Miscellaneous
Income, 1099-A, 1099-C (the last option) under "Less
Common Income" and click Start
Scroll down to the
last option "Other reportable income" and
click Start
Answer "Yes" and Continue
Type Fellowship into
the description box and the amount.
