Responding to an IRS Audit in Illinois
I received an IRS audit notice — here's what Illinois law says and what to do next.
Statute: 35 ILCS 5/506
Deadline: 365 days
Penalty: Illinois Department of Revenue must be notified of federal changes within 120 days. State assessment period is generally three years
What is responding to an irs audit?
An audit letter in the mailbox is one of the more visceral experiences in American adult life, but most audits are routine civil matters about whether the math on a return holds up. Roughly three-quarters of IRS examinations are correspondence audits — done entirely by mail, no in-person meeting. The rest are office audits at an IRS location or, much more rarely, field audits at your home or business.
The Taxpayer Bill of Rights at § 7803(a)(3) guarantees the basics: you have the right to know why the IRS is asking, the right to bring an enrolled agent, CPA, or tax attorney, and the right to appeal anything they decide. An audit does not mean you did anything wrong. Returns get pulled for random selection, statistical scoring (the IRS's DIF score), 1099/W-2 mismatches, or because something on a related return triggered a flag.
What to Do If the IRS Is Auditing You
Step 1: Read the letter slowly. The notice tells you which year is being examined, which line items they're asking about, and exactly what they want. Audits are narrow — answer to the scope, not to your whole tax life.
Step 2: Get representation. Enrolled agents, CPAs, or tax attorneys can speak to the IRS for you. § 7521 gives you the right to be represented and the right to record interviews after 10 days' notice. You don't have to face an IRS examiner alone.
Step 3: Gather records. Organize the documents on the line items they asked about — receipts, bank statements, mileage logs, charitable contribution acknowledgments. Make copies. Never send originals.
Step 4: Respond by the deadline. Silence is the worst answer. Ignored audits become default assessments — the IRS makes the math up and bills you.
Step 5: Appeal if needed. If you disagree with the audit results, file a written appeal within 30 days of the audit report. The Independent Office of Appeals has its own officers, and they regularly settle cases the examiners wouldn't.
How Illinois differs from federal law
Illinois taxpayers have federal Taxpayer Bill of Rights protections plus state-level audit rights:
- Illinois Taxpayers' Bill of Rights (35 ILCS 735/3): Guarantees the right to be informed about audit procedures, the right to representation, and the right to appeal any assessment before paying.
- Independent Tax Tribunal: Illinois has an independent Tax Tribunal (35 ILCS 1010) that hears disputes between taxpayers and the Illinois Department of Revenue (IDOR). You can challenge state tax assessments without paying first.
- Reasonable notice: IDOR must provide reasonable notice before conducting an audit and must explain the scope and basis of any examination.
- Statute of limitations: Generally 3 years from the due date or filing date (whichever is later) for state income tax assessments. Extended to 6 years if 25%+ of income is omitted.
Additional steps in Illinois
For state tax audits, contact the Illinois Department of Revenue (IDOR) at tax.illinois.gov or call (800) 732-8866. Appeal to the Illinois Independent Tax Tribunal. For IRS audits, contact the IRS Taxpayer Advocate Service at (877) 777-4778.
What you should NOT do
Don't ignore the notice. Ignored becomes default assessment. The IRS picks the numbers and they pick to their advantage.
Don't volunteer extra information. Answer what's asked, send what's requested. Nothing more. Volunteering opens new lines of inquiry that weren't on their radar.
Don't lie or fabricate documents. A civil audit becomes a criminal investigation the moment falsified records show up. § 7206 covers tax perjury — felony, up to three years.
Don't agree to extend the statute of limitations on a Form 872 without talking to a tax professional first. The IRS often asks for an extension when their three-year window is closing. You can refuse, and sometimes refusing is the right move.
Don't wait — the clock is ticking.
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Generate your irs audit response →This page is general legal information for Illinois, not legal advice for your specific situation. Laws change, and how a statute applies depends on facts we don't know. For advice on your matter, consult a licensed attorney in Illinois.