What AGI should I use if someone claimed me as a dependent?
If you didn't file your own return last year and you’re in TurboTax, just tell us you didn’t file last year when we ask you. But if you’ve already entered a number for your adjusted gross income (AGI), manually enter 0 instead.
Otherwise, if you filed your own return last year but someone also claimed you as a dependent (this is common with college-age students), you'd use the AGI from your 2015 return, not theirs.
Note that being claimed or claiming someone as a dependent isn’t the same as married filing jointly.