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shannon061204
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Reject code for state 1040-8100-1. How do I fix this?

 
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last updated ‎January 28, 2026 5:28 PM
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Mike9241
Level 15
Level 15

Reject code for state 1040-8100-1. How do I fix this?

See this webpage since various things could be wrong

https://kb.1040.com/kb/filing/il-illinois-agi-rejection-code-il1040-8100-1/ 

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