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Directory Results for Illinois Department of Revenue IL941X 2012 Amended Illinois Withholding Income Tax Return and Instructions Step 1: Provide your information Reporting Period If you are a quarterly filer: Federal employer identification number (FEIN) Seq to Illinois Department of Revenue IL941X 2014 Amended Illinois Withholding Income Tax Return Step 1: Provide your information Reporting Period Federal employer identification number (FEIN) Seq