Illinois State Taxes and Income Tax

efile Illinois tax return
"The Prairie State"

Prepare and eFile your Illinois and IRS tax return for the current tax year. The IRS and the respective state tax agencies require you to e-file a federal income tax return at the same time you e-file a state tax return. This is not an policy, but an IRS and state agency policy. Thus, technically you cannot e-file anywhere - not just - an Illinois tax return without also e-filing the associated IRS tax return. Thus, you should e-file your IRS and IL return together on to avoid mailing anything.

Find detailed instructions on how you can only prepare and mail in - not eFile - an Illinois tax return - here via You can complete and sign the forms online before you download/print and mail the forms to the Illinois tax department.

IL Tax Help and Resources

Illinois State Income Tax Rate: 4.95%
Estimate your IL Income Taxes now
Compare other state income tax rates.
Where Is Your Illinois Tax Refund Money?
Step 1: Sign into your account and check acceptance by the tax agency.
Step 2: Check your Illinois tax refund status.
Where Is Your IRS Refund?
Step 1: Sign into your account and check acceptance by the IRS.
Step 2: Check your IRS tax refund status.
Illinois Income Tax Extension
Illinois Income Tax Amendment
How to Correct a Rejected Tax Return
If your IL tax return was rejected by the IL tax agency - not - see instructions on how to correct a rejected Illinois return
How to Pay Income Taxes
Illinois, IRS Late Filing, Tax Payment Penalties
1. Late Filing Penalty: You will be assessed a penalty of $250 or 2% of the tax owed (whatever is less) per month you file your return after the tax return deadline. The penalty is reduced by timely payments or credits. In the event you file your return on time but the return cannot be processed, you will have 30 days to correct the return before any penalty is due. If you do not file your return within 30 days after you receive a notice of non-filing, you will be imposed an additional penalty of $250 or 2% of the taxes owed shown on your return (whatever is greater) without regard to timely payments. Not only will the additional penalty not exceed $5,000, but it will be assessed even if there is no tax due.
2. Late Payment Penalty: This penalty is based on the number of days you submit your total taxes owed late (1-30 days: 2%; 31+ days: 10%). The penalty is 15% of any amount that is not paid until after an audit or investigation of your liability is initiated, and 20% of any amount that is not paid within 30 days after the IL state tax agency sends you an audit-prepared amended return for you to sign and send to the agency. The 20% penalty also applies to the amount you paid within the 30-day period if you fail to sign and return the amended return within that period or if you paid the tax due under protest or subsequently file a claim or refund of the payment.
3. IRS Penalties: Calculate and Estimate your potential IRS income tax return penalties.
IL Tax Return Mailing Addresses
Find various Illinois mailing addresses for tax returns, tax amendments, and tax payments.
Illinois Income Tax Brackets
Illinois Income Tax Forms
Illinois Unemployment Benefits

Start Federal and Illinois Tax Returns

e-File These Illinois State Tax Forms

Prepare and e-file these state forms for the current tax year in conjunction with your federal and state income tax return. As you proceed through the tax interview on, the application will select the correct state forms for you. You can also select tax forms individually. All these forms will then be e-filed by you to the state tax agency. Instructions on how to only prepare a state income tax return.

CPP-1 - Illinois State Tax Installment Payment Plan Request
EG-13-I - Illinois Financial and Other Information Statement for Individuals
IL-1040-ES - Illinois Estimated Income Tax Payments for Individuals
IL-1310 - Illinois Statement of Person Claiming Refund Due a Deceased Taxpayer
IL-W-4 - Illinois Employee's and other Payee's Withholding Allowance Certificate
IL-1040 - Individual Income Tax Return
IL-1040-X - Illinois Amended Individual Income Tax Return
IL-1310 - Statement of Person Claiming Refund Due a Deceased Taxpayer
IL-505-I - Illinois Automatic Extension Payment for Individuals
Schedule ICR - Illinois Credits
Schedule M - Other Additions and Subtractions for Individuals
Schedule NR - Nonresident and Part-Year Resident Computation of Illinois Tax

Due to IRS and state tax data sharing and validation requirements, you can only e-file a state income tax return while also e-filing a federal income tax return. This is not an regulation; all online tax filing websites have to adhere to this IRS/state issued tax data sharing policy. You can, however, prepare all 44 state income tax returns on if you have already e-filed or filed your IRS return. See instructions on how you can ONLY prepare and file state income tax return(s). Only on can you prepare, file, or e-file unlimited state tax returns for one low price and not pay for each state return like you would do on H&R Block® vs. TurboTax®. Dare to compare now.