Illinois State Tax Extension

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  • General Instruction
  • Business & Non Exempt
  • Individual
Illinois will automatically grant all taxpayers a six-month extension of time to file Form IL-1040. For calendar year filers, the filing date is automatically extended to October 15. You are not required to file Form IL-505-I in order to obtain this automatic extension. However, you must pay any tentative tax due in order to avoid any late-payment penalty and interest on tax not paid by the original due date of your return.

File Form IL-505-I only if tentative tax is due and you pay with a paper check or money order. You must attach a copy of the approved federal extension to your Form IL-1040 when you file your return to avoid a late-filing penalty.

Illinois will grant you an additional extension to file of more than six months (seven months for corporations) if the Internal Revenue Service (IRS) grants you an additional extension. If you do not owe any tentative tax, you are not required to file Form IL-505-B. However, you must attach a copy of the approved federal extension to your annual return when you file it.

An automatic six-month (seven-month for corporations) extension is allowed to file your annual return whether or not you request the automatic extension. You are not required to file Form IL-505-B to obtain this extension if no tentative tax is due.

Is there an additional extension time granted?


Illinois will grant you an additional extension to file of more than six months (seven months for corporations) if the Internal Revenue Service (IRS) grants you an additional extension. If you do not owe any tentative tax, you are not required to file Form IL-505-B. However, you must attach a copy of the approved federal extension to your annual return when you file it.

You must file your completed Form IL-505-B, and pay any tentative tax amount you owe by the original due date of your tax return or as soon as you realize you owe tentative tax. This includes annual and short-year returns. The due date depends on the type of tax return that you file. Refer to the following list of return due dates. All dates refer to the months following the close of the taxable year.

What are the due dates?

  • corporations, subchapter S corporations - the 15th day of the 3rd month
  • partnerships, fiduciaries, composites, exempt organizations (employee trusts only) - the 15th day of the 4th month.
  • exempt organizations (all others) - the 15th day of the 5th month
  • cooperatives - the 15th day of the 9th month

What are the Penalties?

  • A late-filing penalty if you do not file a processable return by the extended due date;
  • A late-payment penalty if you do not pay the tax you owe by the original due date of the return;
  • A bad check penalty if your remittance is not honored by your financial institution. Interest is calculated on tax from the day after the original due date of your return through the date you pay the tax.

When I should not file Form IL-505-B?


After completing the Tax Payment Worksheet, you find that you do not owe additional tax, or you make your extension payment electronically.

Unitary group: If you are a member of a unitary business group that is filing a combined return, your designated agent must complete one Form IL-505-B for the entire group as though it is one taxpayer.

Federal consolidated group: If you are a member of a federal consolidated group, you must file a separate Form IL-505-B for each member that is required to file an Illinois tax return. We will not grant “blanket” or consolidated extensions.

Form IL-1023-C filers:If you are filing Form IL-505-B for an extension to file your Form IL-1023-C, you must write “666” on the “SEQ” line on this form.

Why should I use Express Extension?


ExpressExtension has an experienced and competent team to meet all your individual and business tax solutions. We provide a complete and easy solution to all your tax needs.

Illinois Department of Revenue automatically grant you a six-month extension of time to file your tax return. For calendar year filers, the filing date is automatically extended to October 15. You are not required to file Form IL-505-I to obtain this automatic extension. However, you must pay any tentative tax due by the original due date of your return in order to avoid any late-payment penalty and interest on unpaid tax.

Is there an additional extension time granted?


If you cannot file your tax return within the automatic six-month extension period, we will grant you an extension of more than six months to file only if the Internal Revenue Service (IRS) grants you an additional extension.

What if I owe any tentative tax?


If you owe any tentative tax, and you pay with a paper check or money order, file Form IL-505-I along with your payment on or before the original due date of your annual return, or as soon as you realize you owe tentative tax.

Mail your Form IL-505-I to:


Illinois Department of Revenue,
P.O. Box 19005,
Springfield,
Illinois 62794-9005.
Make your check or money order payable to “Illinois Department of Revenue.” Be sure to write your Social Security number, tax year, and “IL-505-I” on your payment.

What are the Penalties and interest?



You will owe a late-filing penalty if you do not file a processable return by the extended due date, late-payment penalty if you do not pay the tax you owe by the original due date of the return, and bad check penalty if your remittance is not honored by your financial institution. You will owe interest on tax from the day after the original due date of your return through the date you pay the tax. We will bill you for penalties and interest.If you file your return within the automatic six-month extension period, do not attach anything to your return to explain your delayed filing. If you file your return after the automatic six-month extension period and the IRS grants you an extension of more than six months, you must attach a copy of the document granting your federal extension to your tax return to avoid a late-filing penalty.

What are the Payment Options?



Pay by Credit Card:

Illinois accepts payment by credit card through Official Payments Corporation. Making your payment in this way automatically qualifies you for an extension of time to file your tax return until October 15. You will not need to file any other forms at this time. You can do this either on the web or by telephone.
Official Payments Corporation will accept Discover/NOVUS, MasterCard, Visa or American Express card to pay your personal income taxes. There is a convenience fee for this service equal to 2.5% of the tax amount being charged. The minimum fee is $1.00.
To make your payment and receive an automatic extension of time to file, have the following information ready:
  • The amount you are paying in dollars and cents
  • Your social security number
  • Your spouse's social security number (if applicable)
  • The first four letters of your last name
  • The first four letters of your spouse's last name, if different from yours Tax year
  • Your home telephone number (including area code)
  • Credit card number
  • Credit card expiration date (MM/YYYY)
  • ZIP Code for the address where your credit card bills are sent
On the Web:

Make your payment at the Official Payments Corp. web site.

By Telephone:

Use your touch-tone phone to call toll-free (800) 272-9829. At the end of your call you will be given a confirmation number. Write down and save this confirmation number for your records

What If I do not owe any tax?

If you are expecting a refund from Illinois there is nothing to be filed, an extension is automatically granted until October 15 for the filing of your tax return.

Why should I use Express Extension?


ExpressExtension has an experienced and competent team to meet all your individual and business tax solutions. We provide a complete and easy solution to all your tax needs.
*We support MI,IL,NC,SC and FL states for the state extensions for business tax extension and IL,NC and SC states for the state extensions for personal tax extension.

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