Illinois | Personal Tax Extension | Form IL-505-I | Automatic Extension Payment for Individual

Modified on Wed, 12 Apr 2023 at 05:20 AM

State Abbreviation IL
State Name Illinois
Extension Status Approved Automatically
Return Due Date

April 18, 2023

Extended Due Date

October 16, 2023

Other Information
  • Illinois provides an automatic extension to October 16th.
  • No paper or electronic extension request required.
  • 100% of tax liability must be paid with Form IL-505-I by original due date of return to avoid penalties.
  • A copy of federal extension must be attached to return when filed.
Online Payment Illinois | Online Tax Extension Payment
Payment Voucher Title Form IL-505-I, Automatic Extension Payment for Individual
State Payment Agency Illinois Department of Revenue
Mailing Address with Payment Illinois Department of Revenue
P.O. Box 19005
Springfield, IL 62794-9005
Online Payment Options | Credit Card To pay with Visa, MasterCard, Discover, or Ameri-can Express call one of the following (convenience fee assessed): Official Payments Corporation at 833-747-1434, Value Payments Systems at 888-972-9457, FIS at 877-578-2937.
Online Payment Options | ACH Debit Payment may be taken directly from a checking or savings account. The bank routing and account number, as well as an Illinois PIN, are needed. The financial institution must be located within the U.S. Go to
Failure to File Penalties Late filing: Lesser of $250 or 2% of tax liability, reduced by timely payments or credits. Nonfiling: Greater of $250 or 2% of tax liability up to $5,000, if a return is not filed within 30 days after receiving a notice of nonfiling.
Failure to Pay Penalties Before audit: 2% of tax liability for payments 1-30 days late. 10% of tax liability for payments 31 or more days late. After audit initiation: 15% of tax liability if paid within 30 days after issuance of the audit-prepared amended return or waiver of restrictions on assessment. 20% of tax liability if taxpayer: • paid after the expiration of the 30 day period; • paid under protest; or • claims a credit or refund for tax, penalties, or interest determined due upon audit.

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