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General Instructions

Illinois Department of Revenue grants an automatic six-month extension of time to file your return. If you determine that you will owe tax, you must use Form IL-505-I, Automatic Extension Payment for Individuals, to pay any tax you owe to avoid penalty and interest on tax not paid by April 15, 2015. If you are expecting a refund from the state there is nothing to be filed, an extension is automatically granted until October 15, 2015 for the filing of your 2014 tax return.

You are automatically allowed an extension of up to six months to file your tax return without filing an extension form. An extension to file your return is not an extension of time to pay your taxes.

You must file Form IL-505-I if all of the following apply to you: you cannot file your tax return by the due date, and you will owe a tentative tax (complete the Tax Payment Worksheet on the back of Form IL-505-I), and you submit your payment by paper check or money order (i.e., you do not use any electronic means, such as electronic funds transfer, to make your payment).

If you owe taxes, payment must be made by April 15, 2015. To avoid an extension underpayment penalty you must pay at least 90% of the tax due by April 15, 2015. Any remaining balance due would be subject to interest only. The extension allows additional time to complete and file your income tax return; however, the extension does not provide additional time to pay the amount of tax owed.

Pay your taxes online with WebPay at Illinois Revenue with ACH Debit.

You can also pay online at Official Payments Corporation. Visa, MasterCard, Discover Network, and American Express credit and debit cards, and other forms of payment, such as Bill Me Later® are accepted. To make a debit card payment you can use a MasterCard or Visa Debit Card or any debit card with Nyce, Pulse or Star logos.

There is a convenience fee for this service which is paid directly to the company. The amount of the fee is based on the amount of your payment.

Pay your taxes by phone by calling Official Payments toll-free at 1-800-272-9829. This automated service is available 24 hours, 7 days a week. At the end of your call you will be given a confirmation number. Save this as proof of payment for your records.

There is a convenience fee for this service which is paid directly to the company. The amount of the fee is based on the amount of your payment.

Along with the extension form, send a check or money order in the amount of the estimated tax due made payable to Illinois Department of Revenue. Write your Social Security number, tax year, and “IL-505-I†on the front of your payment. Mail to:
Illinois Department of Revenue
PO Box 19005
Springfield, IL 62794-9005

Those who do not pay the full amount due on or before April 15, 2015 will be charged interest on the unpaid balance and a late payment penalty. Those who do not file for an extension, or file late are also charged a substantial late filing penalty.

  • Interest is calculated on the tax from the day after the original due date of the return through the day you pay the tax. Interest is simple interest figured using a daily rate. Illinois adjusts the current interest rate charge twice each year.
  • Late payment penalty rates are: 2% for up to 30 days late; 10% for 31 or more days.
  • A late payment penalty is based on the amount of tax shown due on your return, minus any timely payments, timely credits, and the tax used in calculating the underpayment of estimated or quarter-monthly tax. This penalty is figured at increasing rates based on the number of days the payment is late. The penalty rates are:
    - 2% of any amount that is paid up to 30 days late
    - 10% of any amount that is paid 31 or more days late.

If you are expecting a refund from Illinois there is nothing to be filed, an extension is automatically granted until October 15, 2015 for the filing of your 2014 tax return.

For more information, visit The Illinois Department of Revenue.