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 https://mytax.illinois.gov/_/
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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