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

Modified on Tue, 14 Jan at 1:20 PM

State Abbreviation	IL
State Name	Illinois
Extension Status	Approved Automatically
Return Due Date	April 15, 2025
Extended Due Date	October 15, 2025
Other Information	Illinois provides an automatic extension to October 15th. No paper or electronic extension request is required. 100% of the tax liability must be paid with Form IL-505-I by the original due date of return to avoid penalties. A copy of the federal extension must be attached to the 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 non-filing.
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 the 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.