2018 Form IL-1040 Instructions - Illinois

The due date for filing your 2018 Form IL-1040 and paying any tax you owe is April 15, 2019. Income Tax Rate The Illinois income tax rate is 4.95 percent (.0495). Exemption Allowance The standard exemption amount has been extended and the cost-of-living adjustment has been restored. The personal exemption amount for tax year 2018 is $2,225. ................
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