Illinois launches 2025 tax amnesty program — limited window to waive penalties and interest

Big news out of Illinois: The Department of Revenue has announced a six-week tax amnesty program running October 1 through November 17, 2025.

Businesses with unpaid Illinois taxes from July 2018 through June 2024 can pay their outstanding balance in full during this window and have all related penalties and interest forgiven.

If you’ve been carrying past-due liabilities — or if you’re expanding into Illinois and discovered uncollected sales tax — this is your chance to get compliant without the usual financial sting.

What changed

The 2025 Illinois Tax Amnesty Program runs from October 1 through November 17, 2025 — you have just six weeks to act. ^[1]

Here’s how it works:

• If you owe Illinois taxes from July 2018 through June 2024, you can pay those balances in full during the amnesty window.
• You’ll need to file any missing returns or submit amended ones if your past filings weren’t accurate.
• Do that, and the state will wipe away all penalties and interest tied to those liabilities.

In plain English: return your Illinois filings (original or amended) and pay what you owe by November 17, and you’ll only owe the tax — nothing more.

Why this matters

This isn’t just a policy footnote — it’s a real financial opportunity.

• If you’ve fallen behind: You can clear the decks without paying years of penalties and interest.
• If you sold into Illinois but didn’t collect: This program lets you settle those back taxes before an audit forces the issue.
• If you’re a remote seller: You can also participate. Illinois is planning a separate remote retailer amnesty in 2026, but this window covers older liabilities.
• If you’re planning ahead: Cleaning up now makes life easier when onboarding to TaxCloud, preparing for an audit, or raising capital.

Next steps

• Review your Illinois filings and identify liabilities from July 2018–June 2024.
• File missing or amended returns.
• Make full payment of eligible liabilities between October 1 and November 17, 2025.
• Monitor IDOR’s amnesty page for updates and instructions.

Don’t wait too long. The amnesty window is only six weeks, and sorting through old returns takes time. Missing this deadline means the penalties come right back.