Illinois has set the dates for its 2025 Tax Amnesty Program to run from October 1, 2025, through November 17, 2025. The program, established under HB 2755, allows taxpayers to pay outstanding tax liabilities for periods ending after June 30, 2018, and before July 1, 2024, with penalties and interest waived if paid in full during the amnesty period.

The bottom line: Businesses with unpaid Illinois tax liabilities from mid-2018 through mid-2024 can take advantage of penalty and interest relief by paying their full outstanding balances between October 1 and November 17, 2025.