Payroll Taxes

Learn more about keeping your business compliant with payroll tax requirements.

Illinois Income Tax Withholding Payment and Filing Requirements

Employers in Illinois must conform with these state rules relating to filing income tax withholding returns.

Periodic Returns. Quarterly (Form IL-941) due by last day of the month following the quarter. Annually (Form IL-941) due by January 31 of the following year. Semi-weekly payments, or monthly (Form 501 with payment by the 15th day of the following month) payments, may be required of some employers.

Annual Reconciliation Returns. None (Form IL-W-3 no longer required)

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