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posted Jan 28, 2026 4:44:42 PM

Need help on fixing state return error IL1040-11870-1.

Hello I really need hp on fixing this error for state taxs IL1040-11870-1. It reads as follow "IL1040-11870-1 - If FormIL1040 Step 12 Line 42 HealthInsuranceBox is selected then one of FormIL1040 Step 12 Line 42 InsuranceForSelfBox, FormIL1040 Step 12 Line 42 InsuranceForSpouseBox, and/or FormIL1040 Step 12 Line 42 InsuranceForDependentsBox must be selected." I have no idea how to fix that i keep going back and nothing. I even redid my federal for no reason. 

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Employee Tax Expert
Feb 3, 2026 7:52:23 AM

Have you received a rejection on your Illinois (IL-1040) state tax return?

 

If so, this rejection code generally involves verification issues regarding taxpayer data, such as:

 

  • the Prior Year Adjusted Gross Income (AGI), 
  • IL-PIN, or 
  • Driver's License/State ID not matching the Illinois Department of Revenue (IDOR) records. 

How to Resolve This Rejection

 

To fix this issue and successfully e-file, please follow these steps:

 

  • Verify Prior Year AGI: Ensure you have entered the exact AGI from your previous year's Illinois return. If you filed late or amended your return, the IDOR might not have updated their records, and you may need to enter $0 as the prior year AGI.
  • Verify Drivers License/State ID information.

If the error persists and is due to a form that cannot be e-filed, you may be forced to file by mail.