Filing a complaint with the IRS starts with picking the right office, because the agency splits complaints across several separate intake units and sending yours to the wrong one can stall the case for months or get it dismissed. Reporting someone for cheating on taxes goes one place. An unresolved refund or account problem goes somewhere else. Disputing an IRS decision, reporting an IRS employee, reporting a paid preparer, reporting identity theft, and claiming a whistleblower award each have their own form and their own address.
Match Your Complaint to the Right Office
Before you fill out anything, identify which of these situations describes yours:
- You think another person or business is cheating on their taxes: Form 3949-A to the IRS in Ogden.
- You have a tax problem the IRS won’t fix through normal channels: Taxpayer Advocate Service, Form 911.
- You disagree with a specific IRS decision, adjustment, or collection action: IRS Independent Office of Appeals.
- An IRS employee behaved improperly: Treasury Inspector General for Tax Administration (TIGTA).
- A paid tax preparer mishandled your return: Office of Professional Responsibility, Form 14157.
- Someone used your Social Security number on a tax return: Form 14039, unless the IRS has already sent you a verification letter.
- You have information about major tax evasion and want a reward: IRS Whistleblower Office, Form 211.
Each channel is covered below with the form, the address, and the limits of what that office will do.
Reporting Suspected Tax Cheating by Someone Else
To report a person or business you believe is violating tax laws, submit Form 3949-A, Information Referral. It covers unreported income, false deductions, fraudulent documents, failure to file, and similar conduct.1Internal Revenue Service. Form 3949-A, Information Referral
Fill in whatever identifying details you have about the subject: name, address, SSN or EIN, the suspected violation, and an estimate of unreported amounts and tax years if you can. You don’t need every field. You can also submit the form anonymously; your own contact information is optional, and the IRS states it will never share your identity with the person or business you report.1Internal Revenue Service. Form 3949-A, Information Referral Providing your contact information does let the IRS reach you for clarification.
Mail the completed form to: Internal Revenue Service, PO Box 3801, Ogden, UT 84409.
Form 3949-A pays nothing. If you want a monetary award for major evasion, that’s the Whistleblower Office, covered further down.
Getting an Unresolved IRS Problem Fixed
The Taxpayer Advocate Service (TAS) is an independent organization inside the IRS that steps in when the normal system has failed you. If you’ve contacted the IRS about a problem, done what they asked, and either got no response or no resolution by the promised date, TAS is where to go.2Taxpayer Advocate Service. Submit a Request for Assistance
TAS accepts cases in two broad situations. The first is economic burden: IRS action or inaction is causing you financial harm, an imminent lien, levy, or seizure is coming, you’ll face significant costs including professional representation if relief isn’t granted, or you’ll suffer long-term consequences that can’t be undone. The second is systemic burden: your issue has gone more than 30 days past the normal response time, the IRS missed a promise date it gave you, or an IRS system or procedure broke down and your problem fell through the cracks.
Request TAS help using Form 911, Request for Taxpayer Advocate Service Assistance.3Internal Revenue Service. Form 911 – Request for Taxpayer Advocate Service Assistance You can fax it to your local TAS office, mail it, or drop it off in person at a Taxpayer Assistance Center.2Taxpayer Advocate Service. Submit a Request for Assistance
Typical TAS cases include stalled refunds, processing delays, misapplied payments or credits, and trouble getting a lien or levy released. The prerequisite is that you tried the normal channels first. TAS does not handle misconduct allegations or fraud tips.
Disputing an IRS Decision
If the IRS proposes changes to your return, denies a claim, or takes collection action you disagree with, you can request a review by the IRS Independent Office of Appeals. This isn’t a complaint in the strict sense, but it’s what most people mean when they want to challenge a decision.
The path depends on the amount and the type of dispute:
- If the total additional tax and penalties proposed for each tax period is $25,000 or less, file a Small Case Request using Form 12203, Request for Appeals Review.4Internal Revenue Service. Preparing a Request for Appeals
- Over $25,000, you need a formal written protest that identifies each item you disagree with and explains the facts and law supporting your position.
- To challenge a lien or levy, use Form 12153, Request for a Collection Due Process Hearing, sent to the address on your collection notice. For other collection actions, Form 9423, Collection Appeals Request, goes to the revenue officer handling your case.
Send your protest or appeal form to the IRS office that issued the letter proposing the changes, not directly to Appeals. Sending it straight to Appeals delays the process.4Internal Revenue Service. Preparing a Request for Appeals Your letter from the IRS lists the correct address and the deadline, typically 30 days from the date on the letter.
Reporting an IRS Employee
When the problem is the behavior of an IRS employee rather than a procedural error, the complaint goes to the Treasury Inspector General for Tax Administration (TIGTA). TIGTA is an independent federal law enforcement agency that investigates IRS personnel, separate from the IRS itself.
TIGTA handles allegations including unauthorized access to confidential taxpayer information (return information is confidential under federal law), misuse of government funds, bribery, falsification of official records, and threats or harassment by IRS agents.5Office of the Law Revision Counsel. 26 U.S. Code 6103 – Confidentiality and Disclosure of Returns and Return Information Excessive force or threats by a revenue officer or criminal investigation agent falls here too.
Be specific in your complaint: date, time, location, and the employee’s name or badge number. TIGTA agents rely on those details to substantiate what happened. You can report by phone at 1-800-366-4484 or through TIGTA’s website.6Office of Inspector General. Report Fraud, Waste, and Abuse
TIGTA does not resolve tax disputes or fix errors on your account. Wrong calculations and delayed refunds are TAS territory.
Reporting a Tax Preparer
If a paid tax preparer inflated deductions, fabricated income, filed a return without your knowledge, or pocketed part of your refund, the IRS investigates through the Office of Professional Responsibility (OPR). OPR enforces the conduct standards in Treasury Department Circular No. 230, which governs attorneys, CPAs, enrolled agents, and other preparers who deal with the IRS on behalf of taxpayers.7Internal Revenue Service. Office of Professional Responsibility and Circular 230
Start with Form 14157, Complaint: Tax Return Preparer.8Internal Revenue Service. Make a Complaint About a Tax Return Preparer If the preparer filed or altered a return without your consent and you also need your tax account corrected, submit Form 14157-A, Tax Return Preparer Fraud or Misconduct Affidavit, together with Form 14157. The affidavit is signed under penalties of perjury.9Internal Revenue Service. Form 14157-A, Tax Return Preparer Fraud or Misconduct Affidavit
If you already have an IRS notice or letter about the issue, send the forms and supporting documents to the address on that notice. Otherwise, fax Form 14157 to 855-889-7957 or mail it to: Attn: Return Preparer Office, 401 W. Peachtree Street NW, Mail Stop 421-D, Atlanta, GA 30308.10Internal Revenue Service. Form 14157, Complaint: Tax Return Preparer
Reporting Tax-Related Identity Theft
If someone used your Social Security number to file a fraudulent return or claim a refund in your name, you may need Form 14039, Identity Theft Affidavit. The most common signal is an e-filed return getting rejected because a return with your SSN was already filed. Other signs include IRS notices about income from an employer you never worked for, an unrequested tax transcript, or an Employer Identification Number issued in your name.11Internal Revenue Service. When to File an Identity Theft Affidavit
Do not file Form 14039 if the IRS has sent you Letter 5071C, 4883C, or 5747C. Those letters contain their own identity verification instructions, and following them is what the IRS needs. Form 14039 is for situations where the IRS hasn’t already contacted you.11Internal Revenue Service. When to File an Identity Theft Affidavit
Complete the form and attach it to the back of your paper tax return, then mail everything to the IRS filing address for your state. You can also send the form on its own.12Internal Revenue Service. How IRS ID Theft Victim Assistance Works
Claiming a Whistleblower Award for Major Tax Evasion
The IRS Whistleblower Office runs a separate program for people who provide information about significant tax underpayments and want a financial reward. It is not the same as Form 3949-A.
For a mandatory award, the tax, penalties, and interest at stake must exceed $2 million. If the target is an individual rather than a business, that person’s gross income must also exceed $200,000 in at least one of the tax years involved. When those thresholds are met and the information leads to a successful collection, the whistleblower receives between 15% and 30% of the collected proceeds, including taxes, penalties, and interest. If your information was already substantially in the public record from court proceedings, news reports, or government audits, the award is capped at 10%.13Office of the Law Revision Counsel. 26 U.S. Code 7623 – Expenses of Detection of Underpayments and Fraud For cases below the $2 million threshold, the IRS has general discretionary authority to pay awards from amounts collected, with no guaranteed percentage or dollar cap in the statute.
Submit your claim on Form 211, Application for Award for Original Information. The information must be original, meaning the IRS didn’t already know it from another source. Send the completed form with your supporting documentation (financial records, emails, internal documents) to: IRS Whistleblower Office – ICE, 1973 N Rulon White Blvd., M/S 4110, Ogden, UT 84404.14Internal Revenue Service. Submit a Whistleblower Claim for Award
Confidentiality and Anti-Retaliation Protections
Return information is confidential under federal law, and the IRS does not publicly identify whistleblowers. If your claim leads to an administrative or judicial proceeding, certain disclosures may be authorized as part of that process.15Internal Revenue Service. Whistleblower Office The IRS can notify you when your information has been referred for examination, when a payment has been made on a related assessment, and where the investigation stands.
Federal law also prohibits employers from retaliating against employees who report tax violations. An employer cannot fire, demote, suspend, threaten, or otherwise discriminate against you for providing information or assisting an investigation. If retaliation occurs, you can bring a civil action and recover reinstatement, double back pay, all lost benefits with interest, and compensation for litigation costs and attorney fees.13Office of the Law Revision Counsel. 26 U.S. Code 7623 – Expenses of Detection of Underpayments and Fraud
Documentation That Keeps Your Complaint Moving
Whichever office you file with, the same preparation habits decide whether the case advances or stalls in intake. Include your Taxpayer Identification Number: SSN, EIN, or ITIN. Every form asks for it, and submitting without it creates an immediate delay.
Gather copies of all IRS correspondence tied to your issue: notices, letters, collection warnings, and any responses you sent. Note the dates of every interaction with IRS staff, plus names or employee numbers when you have them. For phone calls, write down the date, time, and what was said while it’s fresh.
Write a chronological statement of the problem from start to finish. Keep it factual and specific. “I called the IRS on March 4, was told my refund would be released within 30 days, and as of May 15 have received nothing” is far more useful than a description of frustration. Reference the documents you’re attaching so the reviewer can match your narrative to the evidence.
Make a full copy of everything (form, statement, attachments) before you send it. If you’re mailing, use certified mail with return receipt so you have proof of delivery and the date the IRS received your package.