@_Maria_ , are you a German citizen? What visa are you on ? when did you enter the USA ? How did you file your return in 2018?
Generally IRS would consider your work place to be your tax home and as such the income from Germany is not foreign income because you are performing the work while physically here in the USA. I need the answers because I sort of remember that under certain conditions these fellowships are taxable only by the issuing state if the recipient was a resident of that state immediately prior to coming to the USA . Once I get your answers then I will go back and verify the tax treaty conditions.
