Yes. Part-year residents and nonresidents who have filed in the past, are included in the MyTax Illinois program. The only exception to this is if you are a nonresident and filing for the first time in Illinois. If you are a nonresident and filing for the first time in Illinois, you will need to file a paper
Form IL-1040, Individual Income Tax Return, and
Schedule NR, Nonresident and Part-year Resident Computation of Illinois Tax.