You can report suspected tax evasion to the IRS using Form 211, by mail, or through an online whistleblower portal

The IRS has three main channels for reporting tax evasion: the Form 211 whistleblower program, a mailing address for general fraud reports, and an online submission system. Form 211 is the formal route and may result in a financial award if your information leads to a successful case. The other methods are simpler but do not offer rewards. Which route you choose depends on whether you have detailed financial information about the suspected evasion and whether you want to remain anonymous.

Tax evasion means deliberately underreporting income, inflating deductions, hiding money in unreported accounts, or failing to file returns altogether. It is different from tax mistakes or aggressive but legal tax planning. The IRS distinguishes between civil fraud (penalties and back taxes) and criminal fraud (potential prison time), and your report can trigger either or both.

Key Takeaways

  • Form 211 is the official whistleblower form and is the only route that may result in a financial award, which ranges from 15 to 30 percent of the taxes recovered if the case succeeds.
  • You can report anonymously by mail to the IRS Criminal Investigation division, or you can file Form 211 with your name and contact information if you want to pursue a reward.
  • The IRS processes Form 211 reports but does not may provide an investigation or outcome, and the process can take years if a case moves forward.
  • You will need specific details to support your report: the person's or business's name, location, type of suspected evasion, and any documents or evidence you have access to.

Form 211: The Whistleblower Reward Program

Form 211, "Application for Award for Original Information," is the IRS whistleblower program. You submit it to the IRS Criminal Investigation division, and if your information leads to a successful prosecution or settlement, you may receive a financial award. The award is calculated as a percentage of the taxes, penalties, and interest the IRS collects as a result of your report — typically 15 to 30 percent, though the IRS has discretion to award less or more in certain cases.

To use Form 211, you must provide your name, address, and contact information. You cannot remain anonymous through this route. You will also need to describe the suspected evasion in detail: the person's or business's name, their location, the type of tax fraud you suspect (unreported income, false deductions, hidden accounts, etc.), and any specific evidence or documents you have seen. The more detailed your report, the more seriously the IRS will consider it.

The IRS does not may provide an investigation or a specific outcome. After you submit Form 211, the Criminal Investigation division reviews it and decides whether to open a case. This can take months or years. If they do investigate and the case results in a settlement or conviction, the IRS calculates your award and sends it to you. If the case does not move forward, you will not receive a reward, though you may receive a letter explaining the decision.

Mailing Address for Anonymous Reports

If you do not want to pursue a reward or do not have enough detail to file Form 211, you can send an anonymous letter to the IRS Criminal Investigation division. Mail your report to: Internal Revenue Service, Criminal Investigation, Attn: Fraud Hotline, 1111 Constitution Avenue NW, Washington, DC 20224.

In your letter, include the person's or business's name, location, and a description of the suspected evasion. Provide any specific details you know: approximate income amounts, types of unreported income, false deductions, hidden accounts, or anything else that supports your suspicion. You do not need to include your name or contact information, and the IRS will not attempt to identify you.

Anonymous reports are taken seriously, but they are harder to investigate without follow-up contact. The IRS cannot ask you clarifying questions or request additional documents if they need them. This method works best when you have clear, specific information but prefer not to be identified.

Online Whistleblower Portal

The IRS maintains an online whistleblower portal where you can submit reports electronically. You can access it through the IRS website under the Criminal Investigation section. The online portal accepts both named and anonymous submissions, though named submissions may be considered for the Form 211 reward program.

The online system walks you through entering the person's or business's name, location, and details about the suspected evasion. You can upload documents or images of evidence if you have them. After submission, you receive a confirmation number. If you provided your contact information, the IRS may reach out to you for clarification, though this is not may provide.

What Information to Gather Before You Report

The stronger your report, the more likely the IRS will investigate. Before you submit anything, gather as much specific information as you can. Write down the person's or business's full name, their address, phone number, and any business registration or tax ID numbers you know. Note the years during which you suspect evasion occurred.

Document the type of suspected evasion: Is the person claiming false deductions? Hiding income from a side business? Failing to report investment income? Operating an unreported cash business? If you have seen documents — bank statements, invoices, receipts, emails, or tax returns — note what you saw and when. If you have access to these documents, you can attach copies to Form 211 or upload them through the online portal. Do not take documents that do not belong to you; the IRS will not accept stolen materials as evidence in a criminal case.

If you witnessed conversations or transactions that suggest evasion, write down what you heard or saw, when it happened, and who else was present. Specific dates and amounts are more useful than general statements.

Timeline and What Happens After You Report

After you submit a report, the IRS Criminal Investigation division reviews it. This initial review can take several weeks to several months. If they decide to investigate, they will open a case file and may contact you if you provided your name and contact information.

An IRS investigation can take years. Investigators may interview the person or business, request financial records from banks and employers, and examine tax returns. If they find evidence of evasion, they can recommend civil penalties, criminal prosecution, or both. Civil cases result in back taxes, interest, and penalties. Criminal cases can result in fines and prison time.

If your report leads to a successful outcome and you filed Form 211, the IRS calculates your award based on the total amount recovered. You will receive a letter explaining the calculation and the award amount. The award is taxable income, so you will receive a Form 1099 for it.

Frequently Asked Questions

Can I report someone anonymously and still get a reward?

No. The Form 211 reward program requires you to provide your name and contact information. If you want to remain anonymous, you can mail a letter to the Criminal Investigation division, but you will not be considered for a financial award. You can choose which route based on whether the reward matters to you.

What if I am not sure whether something is tax evasion or just aggressive tax planning?

Tax evasion is deliberate underreporting or fraud. Aggressive but legal tax strategies are not evasion. If you are unsure, describe what you observed in your report and let the IRS determine whether it is criminal. Describe specific behaviors: unreported income, false deductions, hidden accounts, or failure to file — rather than guessing about intent.

Do I need a lawyer to file Form 211?

No. You can file Form 211 yourself. The form is straightforward and asks for your information, the person's information, and details about the suspected evasion. Many people file without legal help. A lawyer can help if you have complex evidence or want guidance on what to include, but it is not required.

What if the person I am reporting is my employer or family member?

You can still report them. The IRS does not require you to report internally first or give the person a chance to correct the problem. If you are concerned about retaliation, you can file anonymously by mail or use the online portal without providing your name. If you file Form 211 with your name, keep records of any retaliation in case you need to report it separately.

How long does it take to receive a reward if my report leads to a case?

There is no set timeline. The IRS investigation can take years, and the reward is only calculated after the case is resolved. Some cases settle within one to two years; others take five years or longer. You will not receive a reward until the IRS has collected the money or the case has been closed with a conviction or settlement.