1 & 2. You can e-file IL alone. IL may ask for a copy of your federal return. If so, send them the MFJ return.
3. Most likely. See IL filing requirements which states: a part-year resident , you must file Form IL-1040 and Schedule NR, Nonresident and Part-Year Resident Computation of Illinois Tax, if
- you earned income from any source while you were a resident,
- you earned income from Illinois sources while you were not a resident, or
- you want a refund of any Illinois Income Tax withheld.
@gur1
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