Illinois Tax Brackets, Rates, Standard Deductions, Forms

Prepare and e-File your 2021 Illinois Income Taxes here on eFile.com together with your Federal Income Tax Return. Per IRS/State regulation - not eFile.com - an Illinois state tax return can only be e-Filed together with an IRS tax return. Instruction how to only prepare a IL state return on eFile.com and then download, print sign and mail it in.

Detailed Information about Illinois state income tax brackets and rates, standard deduction information, and tax forms by tax year etc. can be found on this page.

Still need to prepare and file an IL return for a previous Tax Year? Find the Illinois tax forms below. You can complete and sign the forms here on eFile.com before you mail them to the Illinois Department of Taxation. For IRS or Federal back taxes, access the tax forms here.

Below find links to other important Illinois income tax return information and other related features (e.g. tax extension, amendment, etc.).

Illinois Income Tax Returns

Illinois Income Taxes

Illinois Tax Deadlines, Extension, Penalties

Instructions, Resources on how to prepare and e-File Illinois Tax Returns or how to prepare an Extension and/or previous Year Tax Returns

Prepare, eFile a 2021 IL + IRS Tax Return: Detailed eFile.com Service Overview

Start Federal and Illinois Tax Returns

Prepare only an IL State Return without an IRS return. Details

Instructions on how to only Complete and Download - not eFile - State Returns on eFile.com.

File a 2021 Illinois Tax Amendment

Complete overview on how to prepare and amend an Illinois Income Tax Return.

Current Illinois Income Tax Forms

Current IL tax year tax forms you can eFile.
Previous tax year or Illinois Income Back Taxes Forms you can complete but not e-File any longer.

Illinois Tax Brackets, Rates explained

Current and past tax year IL Tax Brackets, Rates and Income Ranges

IRS Tax Brackets, Rates by Tax Year

Calculate and Estimate your IRS Income Tax Brackets and Rates with the eFile RATEucator.

Income Tax Brackets, Rates, Income Ranges, and Estimated Taxes Due

Your Illinois Income is based on a flat tax rate. When you prepare your return on eFile.com this is all calculated for you.

Illinois Tax Brackets for Tax Year 2021

2021 Illinois net income is taxed at a 4.95% flat rate.

Illinois Tax Brackets for Tax Year 2020

Your Illinois net income is taxed at a 4.95% flat rate.

Income Tax Brackets for Other States: Compare State Tax Brackets, Rates
For your personal Effective IRS Tax Rate use the RATEucator Tool

Illinois Standard Deductions

Illinois does not have a state standard deduction, nor do they use the federal standard deduction amounts.

Other Standard Deductions by State: Compare State Standard Deduction Amounts
IRS Standard Deduction: Federal Standard Deductions

Illinois Income Tax Forms

Illinois State Income Tax Forms for Tax Year 2021 (Jan. 1 - Dec. 31, 2021) can be e-Filed in conjunction with a IRS Income Tax Return. Details on how to only prepare and print an Illinois 2021 Tax Return.

Below are forms for prior Tax Years starting with 2020. These back taxes forms can no longer be e-Filed. You can complete the forms with the help of eFile.com free tax calculators. Complete the respective Form(s) below, sign, and mail them to the Illinois Department of Taxation. In addition to filing Illinois Forms you might also have to file previous IRS Tax Return Forms.

In addition to filing Illinois Forms you might also have to file previous IRS Tax Return Forms. If you can not find the form listed there use the search button below.

Search Tax Forms

Form Number, Description

Year

Status

CPP-1 - Illinois State Tax Installment Payment Plan Request

General