What payroll deadlines should employers track?

Payroll Tax Deadlines for Employers in Illinois

Employers operating in Illinois must stay on top of several payroll tax deadlines to ensure compliance and avoid penalties. These deadlines cover federal and state payroll tax obligations.

Federal Payroll Tax Deadlines

• Form 941 (Employer's Quarterly Federal Tax Return): Due by the last day of the month following each quarter:
  • Q1 (Jan-Mar): April 30
  • Q2 (Apr-Jun): July 31
  • Q3 (Jul-Sep): October 31
  • Q4 (Oct-Dec): January 31 of the following year
• Federal Unemployment Tax (FUTA) Payment: Due quarterly if the liability exceeds $500. Payments are due by the last day of the month following each quarter.
• Form W-2 and W-3: W-2 forms must be provided to employees by January 31, and W-3 must be filed with the Social Security Administration by January 31.

Illinois State Payroll Tax Deadlines

• Illinois Withholding Tax: Employers must remit state income tax withheld from employees on a monthly or quarterly basis depending on the amount withheld:
  • Monthly filers: Payments are due by the 15th day of the following month.
  • Quarterly filers: Payments are due by the last day of the month following the end of the quarter.
• Illinois Unemployment Insurance (UI) Contributions: Payments are generally due quarterly by the last day of the month following the end of each quarter.
• Form IL-W-3 (Annual Withholding Reconciliation): Due annually by January 31 for the previous calendar year.

Operational Tips for Managing Payroll Deadlines

• Automate payroll tax payments and filings to reduce errors and ensure timely submissions.
• Maintain accurate payroll records including wages, tax withholdings, and payment confirmations for compliance and audit readiness.
• Classify employees correctly to apply appropriate tax rates and avoid misclassification penalties.
• Use payroll software or a service that supports Illinois-specific tax calculations and reporting requirements.
• Stay updated on any changes in tax rates or filing rules by regularly checking the Illinois Department of Revenue and Illinois Department of Employment Security websites.

As of 2026, following these deadlines and operational practices helps Illinois employers maintain compliance with payroll tax obligations and avoid costly penalties.