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Reporting of Claim by Employer 820 ILCS 305-6
The Workers' Compensation Act requires employers (or insurers acting on their behalf) to send reports to the Commission on all accidents involving more than three lost work days. First reports on fatal accidents are due within two work days after the death. In all other cases such report shall be made between the 15th and 25th of each month unless required to be made sooner by rule of the Commission.
A supplementary or subsequent report should be made if it is determined that a permanent disability is involved.
There are two versions of each report. The Commission will accept either version. The IC45 and IC85 forms were created by the Commission; the IA1 and IA2 forms were created by the International Association of Industrial Accident Boards and Commissions, and are used in several states. It may be more convenient for multi-state employers to use the IAIABC forms.