Illinois State Income Tax Data Sheet


© 2019

Tax Bracket (Single) [2] Tax Bracket (Couple) [3] Marginal Tax Rate
$0+ $0+ 3.75%

Note: Illinois' income tax has a single flat tax rate for all income.

The Illinois income tax was lowered from 5% to 3.75% in 2015. Previously, the tax rate was raised from 3% to 5% in early 2011 as part of a statewide plan to reduce deficits. If you expect to owe $500 or more on April 15th, you must pay your income tax to Illinois quarterly using Form IL-1040-ES.

Illinois State Income Tax Deductions

Income tax deductions are expenses that can be deducted from your gross pre-tax income before determining your taxable income.

Illinois Standard Deduction

Unlike many other states, Illinois has no standard deduction. Certain itemized deductions (including property tax, qualified charitable contributions, etc) may be allowed depending on the income level and filing type of the taxpayer. Keep in mind that not all deductions allowed on your federal income tax return are necessarily going to be allowed on your Illinois income tax return.

Illinois Personal Exemptions

Illinois' personal income tax exemptions include a personal exemption of $2,125.00. You can deduct one single exemption from your gross income if you are responsible for supporting yourself financially.

Illinois Dependent Deduction

Illinois has a dependent exemption of $2,125.00. You may claim one dependent exemption for each of the children, relatives, or others who live with and are supported by you as described § 152 of the IRC (Internal Revenue Code).

Illinois Itemized Deductions

Unlike the Federal income tax, the Illinois income tax does not allow itemized deductions. You may claim the Illinois standard deduction if applicable, and specific deductions may be available to Illinois taxpayers as limited deductions or tax credits.

Illinois State Income Tax Data Sheet


© 2019

Web Resources:

Department of Revenue Website:

Illinois Tax Forms:

Illinois Income Tax Information:

Illinois Tax Refund Portal:

Important Tax Addresses:

Income Tax Returns (Without Payment)
Illinois Department of Revenue
PO Box 1040
Galesburg, IL 61402-1040 ;

Income Tax Returns (With Payment), Quarterly Tax Payments
Illinois Department of Revenue
Springfield, IL 62726-0001;

Illinois Department of Revenue
Willard Ice Building
101 West Jefferson Street
Springfield, Illinois 62702
Phone: 1-800-732-8866;