How to Report Fraud to the IRS and Earn a Reward

You can report tax fraud to the IRS by filing Form 3949-A to pass along a tip anonymously, or Form 211 if you want to pursue a financial award through the IRS Whistleblower Program. The whistleblower route guarantees a mandatory award of 15 to 30 percent of what the IRS collects, but only when the disputed tax, penalties, and interest together exceed $2 million. Either form can trigger a full IRS investigation; the choice between them comes down to whether you want anonymity or a potential payout.

What the IRS Will Actually Investigate

The IRS separates honest mistakes from deliberate cheating, and only the second category is fraud. A math error or a misunderstood deduction is not fraud. What the agency pursues is intentional conduct: hiding income, inventing deductions, using fake documents, stashing money in undisclosed offshore accounts, or participating in abusive tax shelters. The common thread is that the person knew what they were doing was wrong and did it anyway to lower their tax bill.

One useful detail: there is no time limit on how far back the IRS can go when fraud is involved. For an ordinary return the IRS generally has three years to audit, but when a return is fraudulent or the taxpayer willfully tried to evade tax, that clock never starts.¹ Tips about older schemes can still lead somewhere.

What to Gather Before You File

The quality of your tip determines whether anything happens with it. Vague accusations rarely get worked. Before filing, pull together as much of the following as you can:

The full legal name and current address of the person or business.
Their Taxpayer Identification Number: a Social Security number or Employer Identification Number, which lets the IRS match your tip to existing tax records right away. If you don’t have it, include whatever identifying details you do have, such as date of birth or business name.
The tax years when the fraud occurred.
A clear description of how the scheme works. “They’re hiding cash income from a side business” is far more useful than “they’re cheating on taxes.”
How you know. Are you a former employee, a business partner, a family member who saw the books? The IRS weighs credibility partly based on your access to the facts.
Supporting documents: internal emails, bank records, invoices, contracts, anything that backs up your claim. You don’t need to send originals with the initial report, but a summary of what you can provide makes the referral far more compelling.

A clear chronological account beats a pile of unsorted paperwork. Walk through the scheme step by step so an IRS analyst can quickly judge whether the lead is worth pursuing.

Reporting Anonymously With Form 3949-A

If you want to tip off the IRS without identifying yourself and without seeking a reward, use Form 3949-A, Information Referral.² The form walks you through the basics: who you are reporting, what they did, and what evidence you have.

You can complete and submit Form 3949-A online through the IRS website, or print it and mail it to: Internal Revenue Service, PO Box 3801, Ogden, UT 84409.³ You can remain completely anonymous; the IRS accepts the information either way. The tradeoff is that you will not receive updates. The IRS does not disclose whether an investigation was opened, and you will not get any portion of whatever the government ultimately collects.

Preparer Fraud, Scheme Promoters, and Identity Theft

Not every tax fraud fits the 3949-A channel. If a tax preparer filed returns without authorization, inflated deductions to generate bigger refunds, or otherwise acted dishonestly, the right form is Form 14157, Return Preparer Complaint. If the preparer actually altered your return or filed a fraudulent one in your name, submit Form 14157-A alongside it. These can be filed online, faxed, or mailed.⁴

For abusive tax schemes and the promoters who sell them, use Form 14242, Report Suspected Abusive Tax Promotions or Preparers. This covers fraudulent shelters, pass-through entity schemes, and social-media tax hacks that sound too good to be true. You can submit it online or mail it with supporting materials to the IRS Lead Development Center.⁵

If someone used your personal information to file a fraudulent return in your name, that is identity theft rather than a traditional fraud tip. Submit Form 14039, Identity Theft Affidavit, online, by fax, or by mail. If the fraud prevented you from e-filing, attach the completed Form 14039 to your paper return.⁶

The Whistleblower Route: Form 211 and Awards

The IRS Whistleblower Program is for people who have specific, credible information about significant tax cheating and want to be paid if the IRS collects as a result.⁷ It runs on different rules than an anonymous tip. You must identify yourself, sign under penalty of perjury, and provide enough detail for the IRS to act.

Who Qualifies for a Mandatory Award

Two conditions must be met for a mandatory award with guaranteed minimum percentages: the amount in dispute (tax, penalties, and interest combined) must exceed $2 million, and if the target is an individual rather than a business, that person’s gross income must exceed $200,000 in at least one of the relevant tax years.⁷

If your tip falls below those thresholds, the IRS can still accept the information and pay a discretionary award, but there is no guaranteed minimum and no set percentage. Discretionary awards tend to be substantially smaller, and the IRS has full control over the amount.

How to File Form 211

All whistleblower claims are filed on Form 211, Application for Award for Original Information. As of late 2025, the Whistleblower Office accepts Form 211 electronically through a secure online portal, which is the preferred method.⁸ You can still download and mail the form if you prefer.⁹

Form 211 is considerably more demanding than Form 3949-A. It asks for a detailed narrative, supporting documentation, and an explanation of how you obtained the information. Many whistleblowers hire a tax attorney or accountant to help prepare the submission. Anonymity is not an option; your identity and signature are required.

After submission, the Whistleblower Office screens the claim to decide whether it warrants investigation. If it does, the office refers it to an IRS examination or criminal investigation team. The Whistleblower Office itself does not investigate; it manages communication with you while the investigation proceeds separately.

How Much You Can Receive

For claims meeting the mandatory thresholds, the whistleblower receives between 15 and 30 percent of total collected proceeds, including taxes, penalties, and interest. The exact percentage depends on how much the whistleblower contributed to the outcome.⁷ On a $10 million recovery, that translates to an award between $1.5 million and $3 million.

There is one significant reduction. If the Whistleblower Office determines that the IRS action was based primarily on information already publicly available through court proceedings, government reports, audits, or media coverage, the maximum award falls to 10 percent of collected proceeds.⁷ Your information is most valuable when the IRS could not have gotten it any other way.

No award is paid until the target’s appeal rights have been exhausted and the collected revenue is secured by the Treasury. Historically, the time from filing to payment has averaged more than nine years for discretionary claims and nearly eleven years for mandatory-threshold claims. If you disagree with the final award determination on a mandatory-threshold claim, you can appeal to the U.S. Tax Court within 30 calendar days of the determination letter, with no extensions available.¹⁰

Taxes on the Award

Whistleblower awards count as taxable income. The IRS withholds federal income tax at 24 percent on awards exceeding $10,000 paid to U.S. citizens and resident aliens, and you will receive a Form 1099-MISC for the tax year the payment is made.¹⁰ Before you see any money, the Whistleblower Office will apply the award against any outstanding federal tax debts, child support obligations, or other federal and state debts you owe.

If you hired a lawyer to pursue a mandatory-threshold claim under 7623(b), attorney fees and court costs are deductible as an above-the-line adjustment to gross income, capped at the award amount.¹¹ That treatment reduces adjusted gross income directly rather than requiring you to itemize. It does not apply to discretionary awards.

If You Took Part in the Fraud

Whistleblowers sometimes know about a scheme because they helped run it. The IRS accounts for this. If the Whistleblower Office finds you played a role in planning or starting the scheme, it can cut your award by up to 33 percent for moderate involvement, 34 to 66 percent for significant involvement, and 67 to 100 percent if you were a primary planner.¹² If you are convicted of a crime arising from your role in planning and initiating the fraud, the Whistleblower Office will deny any award entirely.¹⁰ A junior employee simply following orders generally will not be treated as having initiated the scheme.

Confidentiality and Protection From Retaliation

Federal law requires the IRS to keep taxpayer information confidential, and the agency extends the same protection to the identity of people who submit tips. The IRS will not disclose your identity to the person you reported as long as the case stays at the administrative level.¹³ If the case moves to court, discovery and trial procedures can force disclosure, and the IRS cannot guarantee anonymity in a judicial proceeding.

For whistleblowers who filed under the formal program, federal law prohibits employer retaliation. An employer cannot fire, demote, suspend, threaten, harass, or otherwise discriminate against an employee for giving information to the IRS about a potential tax violation or for participating in an IRS investigation. Remedies include reinstatement with the same seniority, double back pay plus full lost benefits with interest, and compensation for special damages including attorney fees.¹⁴

Retaliation complaints must be filed with OSHA within 180 days of the retaliatory act, either at a local OSHA office or online.¹⁵ Miss that window and you can forfeit the claim.

What Happens if You File a False Report

Knowingly submitting fabricated information to a federal agency is a crime, punishable by up to five years in prison.¹⁶ This applies to both Form 3949-A and Form 211. Whistleblower claims carry additional exposure because you sign under penalty of perjury. These channels are built for people with genuine knowledge of tax cheating; using them to harass someone or settle a personal grudge can land you in criminal court instead of collecting a reward.

1
Office of the Law Revision Counsel. 26 U.S. Code 6501 – Limitations on Assessment and Collection
2
Internal Revenue Service. About Form 3949-A, Information Referral
3
Internal Revenue Service. Form 3949-A, Information Referral
4
Internal Revenue Service. Make a Complaint About a Tax Return Preparer
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Internal Revenue Service. Abusive Tax Schemes and Abusive Tax Return Preparers – IRS Lead Development Center
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Internal Revenue Service. Identity Theft Guide for Individuals
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Office of the Law Revision Counsel. 26 USC 7623 – Expenses of Detection of Underpayments and Fraud, Etc.
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Internal Revenue Service. Whistleblower Office Announces New Digital Form 211
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Internal Revenue Service. Submit a Whistleblower Claim for Award
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Internal Revenue Service. 25.2.2 Whistleblower Awards
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Office of the Law Revision Counsel. 26 U.S. Code 62 – Adjusted Gross Income Defined
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eCFR. 26 CFR 301.7623-4 – Amount and Payment of Award
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Office of the Law Revision Counsel. 26 USC 6103 – Confidentiality and Disclosure of Returns and Return Information
14
Whistleblower Protection Program. Taxpayer First Act (TFA)
15
Federal Register. Procedures for the Handling of Retaliation Complaints Under the Taxpayer First Act (TFA)
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Office of the Law Revision Counsel. 18 U.S. Code 1001 – Statements or Entries Generally