TurboTax has 2 places where you could input your graduate student stipend. You can choose to enter the fellowship income in either one
place or the other. Either way, if your earned income for the year is less than the contribution limit (in 2016, $5,500 for those under 50), you can only contribute up to your earned income. In other words, if your earned income is $3,000, you can only contribute up to $3,000.
One option is that you would have to go
through the education section (under credits and deductions). In the end
you can enter your taxable fellowship.
The other alternative is
to "Visit All" the "Less Common Income" topics. If you visit all these
topics, one type of less common income they'll ask for is "Taxable
Scholarships and Fellowships." There it says: "If you are not a
candidate for a degree, then scholarship, fellowship, and grant income
are taxable and should be reported here. Enter the amount of taxable
scholarship, fellowship, and grant income you received."
It will be added to line 7 on form 1040 (and SCH <amount> will be written next to it).
