Per Illinois, if you were a nonresident of Illinois during the entire tax year,
you must complete and file Form IL-1040 and Schedule NR
- if
you
earned enough taxable income from Illinois sources to have a
tax liability (i.e., your Illinois base income from Schedule NR is
greater than your Illinois exemption allowance on Schedule NR), or
- are entitled to a refund of Illinois Income Tax that was withheld
from your pay in error.
In regards to your rental property, if it generated a net income or loss, then you must report it.
For more information, please see Page 3-Line 15 Rental real estate, royalties, partnerships, S
corporations, trusts, etc: http://www.revenue.state.il.us/taxforms/IncmCurrentYear/Individual/IL-1040-Schedule-NR-Instr.pdf
