When the IRS calls, hire a tax lawyer. Not a tax preparer.
Tax preparers do tax returns. CPAs do tax planning. Tax lawyers do tax fights — IRS audits, Illinois Department of Revenue controversies, collection actions, criminal investigations, U.S. Tax Court litigation, and the kind of complex transactional tax work that affects whether you keep your money. If you're getting letters from the IRS or IDOR, the firms below are the people who know how to make them stop.
These 10 Chicago tax firms cover the full spectrum: IRS controversy, Illinois state and local tax (SALT), international tax, criminal tax defense, and high-net-worth tax planning. Most offer free initial consultations.
How we picked these 10: We reviewed published verdicts and settlements, peer rankings (Best Lawyers, Super Lawyers, Chambers and Partners, Avvo), client review patterns, and bar association recognition. Firms that appeared consistently across independent sources made the list. We do not accept payment for placement, and we do not write sponsored reviews. More on our methodology →
Practice focus: IRS audit, Illinois sales tax, FBAR, crypto tax, business tax
Founder Andrew Gordon is both an attorney and a CPA. Licensed in U.S. Tax Court. Strong crypto and FBAR practice.
Practice focus: Tax planning, M&A tax, real estate tax, family wealth tax
Premier Chicago tax practice for HNW and businesses. Multiple Best Lawyers attorneys.
Practice focus: Tax planning, controversy, business succession
Multi-practice firm with strong tax bench. Multiple Best Lawyers attorneys.
Practice focus: IRS audit, tax controversy, white-collar
Long-established Chicago tax-controversy boutique. Multiple Best Lawyers honors.
Practice focus: IRS audit, Illinois tax, OIC, collections
Multi-state tax controversy practice. Strong individual and small-business intake.
Practice focus: IRS audit, tax debt, tax planning
Boutique with comprehensive tax problem-solving practice. Strong consumer + small-business focus.
Practice focus: Federal tax planning, M&A tax, international tax, corporate
Chicago-headquartered global firm. Premier corporate tax practice. Chambers Band 1.
Practice focus: M&A tax, private equity tax, corporate, restructuring
Chicago-headquartered largest U.S. firm by revenue. Strong PE and M&A tax practice.
Practice focus: Corporate tax, M&A, international tax, controversy
Chicago-headquartered premier global firm. Multiple Chambers and Best Lawyers tax attorneys.
Practice focus: Tax planning, M&A tax, IRS controversy
Multi-state firm with strong Chicago tax practice. Strong mid-market client base.
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Request Free Consultation →An IRS audit notice typically gives 30 days to respond. Your tax lawyer files a power of attorney (Form 2848), responds to the IDR, and represents you. Cases that don't settle at audit can be appealed to IRS Appeals or petitioned to U.S. Tax Court. Criminal tax investigations require immediate counsel. Total timeline ranges from 3 months to 3+ years.
Chicago tax controversy work typically runs $400-$800/hour for partners. Audit defense often involves a flat fee per stage ($5,000-$25,000) or hourly + retainer. Offer in Compromise engagements: $3,500-$10,000+. Criminal tax defense is hourly with substantial retainers ($25,000-$100,000+).
The legal directory you find on Google has thousands of Chicago tax and IRS firms. Most are competent. A few are problematic. The patterns to avoid:
Guaranteed outcomes. No ethical attorney can guarantee a result. If a firm promises a specific recovery, dismissal, or visa approval, walk away.
The disappearing partner. You meet a senior partner at intake, then never speak to them again. The case is handled by an unsupervised junior or a paralegal. Ask in writing who will be your day-to-day attorney.
Pressure to sign immediately. Reputable firms give you the retainer in writing, time to read it, and the option to take it home. High-pressure intake is almost always a sign of a volume mill, not a craftsperson's practice.
No verifiable track record. The firm should be able to point to verdicts, settlements, peer rankings, or bar association recognition. "We've helped thousands of clients" is marketing copy. Specific numbers, named cases, and third-party rankings are evidence.
Vague fee terms. "Don't worry about cost" is a red flag. Every legitimate Chicago lawyer will give you a written engagement letter with the fee structure, what's covered, what triggers extra charges, and what happens if you fire them.
Most Chicago firms on this list offer a free initial consultation. Use it. Bring a list of questions and write down the answers. Compare across at least two firms before you sign.
Chicago is its own market. The procedure, the courts, and the strategy are city- and state-specific in ways that matter to your outcome.
Local courthouses matter. the Daley Center (Cook County Circuit Court) and the Northern District of Illinois have judges, calendars, and procedures that shape how cases move. A firm that knows the local courthouse has an advantage.
Filing deadlines are strict. Notice of Claim windows for cases against the City or County, Statute of Limitations periods, and pre-suit certification requirements vary by case type and are unforgiving. A missed deadline often means a lost case — full stop.
Local procedure rules matter. Each court has its own forms, motion practice, and judge preferences. The right Chicago firm will know not just the law, but the unwritten rules of the courthouse you'll be in.
Local plaintiffs/defendants do well in front of local juries. Verdict patterns vary by venue, and a trial-capable firm uses venue strategically.
Both can help — but only a tax lawyer has attorney-client privilege. CPA-client communications are not privileged in criminal cases. If there's any chance the audit could escalate to criminal, hire a lawyer first.
An OIC lets you settle your tax debt for less than you owe if you can show you can't pay it in full. The IRS accepts about 30-40% of OIC submissions.
The IRS can levy bank accounts, garnish wages, file federal tax liens, and in extreme cases seize property. A tax lawyer can stop most levies through Collection Due Process appeals or installment agreements.
IDOR audits Illinois income tax, sales tax, and use tax aggressively. Many Chicago businesses face combined IRS + IDOR audits. Most Chicago tax lawyers handle both.
Generally 3 years from filing. 6 years if you understated income by 25%+. Unlimited if you didn't file or the return was fraudulent. IDOR has its own statutes.
One last thing. Choosing a lawyer is personal. Read the reviews. Call two or three firms before you sign. Ask each one: How many cases like mine have you taken to verdict in the last three years? The answer tells you everything. — The LawFirmSquare team