If my net rental income from another state (Illinois) was negative, do I still need to file non-resident 1040?

[DianeW777]

No. The taxable income is what is used to determine filing requirement. Here are the nonresident filing requirements for Illinois (IL).

• a nonresident, you must 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, Step 5, Line 46, is greater than your Illinois exemption allowance on Schedule NR, Step 5, Line 50), or
  • you want a refund of any Illinois Income Tax withheld in error. You must attach a letter of explanation from your employer.