The Illinois Department of Revenue (IDOR) is reminding taxpayers who missed the April 15, 2025, deadline that there’s still time to file—and that filing promptly can help lower any penalties and interest owed.

Illinois grants an automatic six-month extension to file individual income tax returns, moving the deadline to October 15, 2025. However, this does not extend the time to pay taxes owed. Taxpayers expecting to owe must submit payment using Form IL-505-I (Automatic Extension Payment for Individuals) to avoid penalties on unpaid balances not paid by April 15, 2025.

To avoid future filing issues, IDOR recommends:

  • Filing electronically through MyTax Illinois
  • Using direct deposit or debit for faster processing
  • Setting reminders and signing up for email updates at tax.illinois.gov

For more information, visit tax.illinois.gov.

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