The IRS has a formal process for reporting suspected tax fraud or unreported income

You can report suspected tax fraud, unreported income, or other tax violations directly to the IRS using Form 211 or through their online whistleblower portal. The IRS takes these reports seriously and investigates them, though you should know upfront that most reports do not result in visible action and the process is confidential — you will not hear back about the outcome unless you file under the formal whistleblower program with a financial stake in the case.

The method you choose depends on whether you have direct knowledge of the violation, whether you want to remain anonymous, and whether you are reporting as a concerned citizen or as someone with inside information about a business or individual. Each route has different timelines and different levels of follow-up.

Key Takeaways

  • Form 211 is the official IRS form for reporting tax violations; you can mail it or file it online through the IRS website.
  • The online whistleblower portal at www.irs.gov/whistleblower is faster and allows you to remain anonymous, though you cannot claim a financial reward through this route.
  • If you have inside knowledge of a business hiding income and that business owes more than $2 million in back taxes, you may be may have access to to a financial award under the formal whistleblower program.
  • The IRS does not confirm receipt of reports or tell you what action was taken, so you should keep your own copy of what you submitted.
  • You can report anonymously through the online portal, but the formal whistleblower program requires your name and contact information.

Filing Form 211: The Official Reporting Method

Form 211, titled "Application for Award for Original Information," is the IRS's standard form for reporting tax violations. You fill it out with details about the suspected violation, the person or business involved, and the facts you know. You do not need to be a tax professional or have proof — the IRS investigates based on the information you provide.

Mail the completed form to the IRS Criminal Investigation office in your region, or file it online through the IRS website. The mailing address depends on which state the violation occurred in; the IRS website lists the correct Criminal Investigation office for each state. Keep a copy for your records. There is no filing fee.

Form 211 does not require you to provide your name, but if you do not, the IRS cannot contact you with questions or notify you of any outcome. If you include your contact information, the IRS may reach out if they need clarification, though this is not may provide.

Using the Online Whistleblower Portal for Anonymous Reports

The IRS whistleblower portal at www.irs.gov/whistleblower allows you to submit a report online without mailing anything. The portal is designed for citizens who want to report suspected violations but prefer to remain anonymous. You describe what you know, provide details about the person or business, and submit. The IRS receives it directly.

This route is faster than mailing Form 211 and leaves no paper trail with your name on it. However, you cannot use the online portal to claim a financial reward. If you have inside information about a business and believe you may be may have access to to a reward, you must use Form 211 or contact the IRS Criminal Investigation office directly.

The portal does not provide a confirmation number or receipt. The IRS does not notify you whether your report was investigated or what happened as a result. This is by design — the portal is meant for concerned citizens reporting suspected violations, not for formal whistleblower claims.

The Formal Whistleblower Program and Financial Rewards

If you have direct, inside knowledge of a business or individual evading taxes and the IRS recovers more than $2 million as a result of your report, you may receive a financial award. This is separate from simply reporting a violation. The award ranges from 15 to 30 percent of the amount the IRS recovers, though the exact percentage depends on the circumstances and the IRS's discretion.

To pursue a whistleblower award, you must file Form 211 and include your name, contact information, and a detailed account of what you know. You should describe your relationship to the person or business, how you obtained the information, and why you believe the information is reliable. The IRS uses this to assess whether your report has merit and whether you have a genuine financial stake in the outcome.

The process is slow. The IRS may take years to investigate, and you will not receive payment until the agency has completed its investigation, collected the taxes owed, and made a formal information about your award. You can check the status of a formal whistleblower claim by calling the IRS Whistleblower Office, but do not expect frequent updates.

What Information to Include in Your Report

Whether you use Form 211, the online portal, or contact the IRS directly, include as much specific detail as you can. The more concrete your information, the more seriously the IRS will treat it. Include the name and address of the person or business, the type of suspected violation (unreported income, inflated deductions, hidden offshore accounts, cash-only business not reporting sales), and the years involved.

Describe how you know about the violation. If you worked there, say so. If you are a family member, say so. If you overheard a conversation, describe when and where. Explain what you observed — for example, "The business reported $50,000 in annual revenue but I processed invoices totaling $200,000" or "The owner told me they keep two sets of books." The IRS investigates based on this information, so specificity matters.

Do not include documents you do not own or have a right to share. If you have copies of tax returns, bank statements, or business records that you obtained legally (for example, as an employee with access), you can reference them, but the IRS will not accept stolen documents as evidence. If you obtained information illegally, tell the IRS how you got it — they will decide whether to use it.

What Happens After You Report

After you submit a report, the IRS does not send you a confirmation or receipt unless you file Form 211 with your name and contact information. If you included your name, the IRS may contact you for clarification, but this is not may provide. Most reports are reviewed by the Criminal Investigation division, which decides whether to open an investigation.

The IRS does not tell you whether an investigation was opened, what was found, or what action was taken. This is true even if you filed as a formal whistleblower. The only exception is if you pursue a formal whistleblower award claim — in that case, you can contact the IRS Whistleblower Office to ask about the status of your claim, though the office will not provide details about the investigation itself.

If the IRS does investigate and recovers taxes, penalties, or interest as a result, and you filed under the formal whistleblower program, you will eventually receive notification about your award. This can take years. If you filed anonymously or through the online portal, you will never know the outcome.

Reporting Your Employer or a Business You Work For

If you suspect your employer or a business you work for is committing tax fraud, you can report it to the IRS using the same methods — Form 211, the online portal, or direct contact with Criminal Investigation. You do not need to report it to your employer first, and you do not need to quit your job.

However, be aware that if you report your employer and the IRS investigates, there is a possibility your employer could learn about the report, especially if the IRS contacts the business as part of the investigation. The IRS does not keep your identity secret from the subject of the investigation in all cases. If you are concerned about retaliation, you can file anonymously through the online portal, though you will not be able to claim a whistleblower award.

If you are reporting your employer and you are concerned about job security, consider consulting with an employment attorney before filing. Some whistleblower protections exist under federal law, but they have specific conditions and timelines.

Frequently Asked Questions

Can I report someone anonymously?

Yes, through the IRS online whistleblower portal. You do not provide your name or contact information. If you use Form 211 or contact Criminal Investigation directly, you can choose not to include your name, but then the IRS cannot contact you or notify you of any outcome. You cannot claim a financial reward without providing your identity.

What if I don't have proof, just suspicion?

You can still report it. The IRS investigates based on the information you provide, and you do not need to have documents or hard evidence. Describe what you observed or what you know, and let the IRS decide whether to investigate. Specificity matters more than proof.

How long does it take for the IRS to investigate?

There is no set timeline. Some investigations take months; others take years. The IRS does not provide updates on the status of an investigation unless you filed a formal whistleblower claim, in which case you can call the Whistleblower Office to ask for a status update.

Will the IRS tell me what happened after I report?

Not unless you filed a formal whistleblower claim and the IRS recovered money. In that case, you will eventually receive notification about your award. If you reported anonymously or simply filed Form 211 without pursuing a formal claim, you will not hear back about the outcome.

Can I report someone if I'm not a U.S. citizen?

Yes. You do not need to be a citizen to report tax fraud to the IRS. You can use Form 211, the online portal, or contact Criminal Investigation directly. If you are concerned about your immigration status, you can file anonymously through the online portal.