Enter personal information and Social Security numbers (SSN). You must provide the entire SSN(s) - no partial SSN.
Joint return: if this is a joint return, both you and your spouse must sign below.
Nonresidents: nonresidents and part-year residents enter the Illinois net income from Schedule NR.
Use tax: use tax on internet, mail order, or other out-of-state purchases from UT Worksheet or UT Table in the instructions; do not leave blank.
Mailing: refer to the 2025 IL-1040 Instructions for the address to mail your return.
| Question | Answer |
|---|---|
| Form Name | Form IL-1040 |
| Form Length | 2 pages |
| Fillable? | Yes |
| Fillable fields | 103 |
| Avg. time to fill out | 18 min |
| Edition | R-12/25 |
| Issuing agency | Illinois Department of Revenue |
| Matches the agency's file | Yes, checked October 2, 2026 |
| Other names | IL-1040, IL1040, IL 1040, Form IL-1040, Illinois tax form, Illinois state tax form, Illinois Department of Revenue form, Individual Income Tax Return |
| Official source | Form IL-1040 (Rev R-12/25), Illinois Department of Revenue |
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