Puede llenar un formulario IL-W-4 nuevo para actualizar los montos de su exención y aumentar su retención de Illinois. This manual is not a complete guide to handling Arizona Workers' Compensation Claims and cannot cover every possible situation.The four chapters in this part provide basic information on the tax system. They take you through the first steps of filling out a tax return. Illinois state income tax withheld from your weekly benefits. Since benefits are not subject to mandatory income tax withholding, if you do not choose to. Last Updated: August 02, 2022.