Illinois - W2 State Filing Requirements

The state requires the filing of Form W-2 if wages were paid to Illinois employees or if income tax was withheld during the year.

Illinois State ID Format:
 

• 9 digits (Eg, 999999999)

Note: The state accepts your federal EIN as state ID.
 

Filing Criteria and Requirements

1: Even if there is no Illinois state tax withheld

• Filing Method: Direct State Filing

  • You must file a W-2 directly with the state.

• Additional Form Required: Not required

• Deadline: February 02, 2026

For more information about Illinois’s W2 filing requirements, click here.