Where and how to report suspected tax fraud

Tax fraud reports go to the Internal Revenue Service (IRS), which has a dedicated unit for this. The main route is the IRS Form 3949-A (Information Referral), which you submit to your local IRS office, or the online whistleblower program if you have direct knowledge of a scheme. You can also report to state tax authorities if the fraud involves state taxes, or to the Treasury Inspector General for Tax Administration (TIGTA) if you suspect IRS employee misconduct.

The IRS does not require you to use a specific form to report fraud — a letter describing what you observed, with dates and names, will be accepted. However, using Form 3949-A or the online whistleblower system creates an official record and may may have access to you for a reward if the IRS recovers money as a result of your report.

You can report anonymously by mail or through a third party, though the IRS cannot contact you with updates or pay a reward if you do not provide contact information. Most people who report fraud do provide their name and phone number so the IRS can ask follow-up questions.

Key Takeaways

  • The IRS accepts fraud reports through Form 3949-A, the online whistleblower system, or a written letter sent to your local IRS office.
  • You can report anonymously, but providing your name and contact information allows the IRS to follow up and may make you may be able to access for a financial reward.
  • State tax authorities handle reports of state tax fraud, and TIGTA handles reports of misconduct by IRS employees themselves.
  • The IRS whistleblower program pays rewards of 15 to 30 percent of money recovered when the case results in a successful prosecution or settlement over $2 million.

Using the IRS whistleblower program for a potential reward

If you have direct knowledge of tax fraud and want to be considered for a financial reward, the IRS Whistleblower Program is the formal channel. You file Form 211 (Application for Award for Original Information) with the IRS Criminal Investigation division. This form asks you to describe the fraud, explain how you learned about it, and provide as much detail as possible about the people or businesses involved, the years in question, and the amounts of money.

Rewards under this program range from 15 to 30 percent of the money the IRS recovers, but only if the case results in a prosecution, settlement, or judgment and the amount recovered exceeds $2 million. The IRS does not pay rewards for information about tax evasion that does not lead to recovery, or for cases where the recovery is under $2 million. Processing can take years, and the IRS will not tell you the outcome of an investigation or whether a reward was paid.

You must have original information — meaning you discovered it yourself, not from news reports or public documents. If you are a current or former employee of the company or person you are reporting, you may still file, but the IRS evaluates these cases differently and reward may be able to access may be affected.

Reporting fraud without expecting a reward

If you suspect tax fraud but do not want to pursue a reward, you can report it directly to the IRS Criminal Investigation division by mail or through the online form on the IRS website. Provide your name, contact information, the name and address of the person or business you are reporting, the type of fraud you suspect (such as unreported income, false deductions, or payroll tax evasion), and any dates or documents you have seen.

The IRS also accepts reports through its online tip line, which you can access through the IRS.gov website under "Report Suspected Tax Fraud." This route does not create a formal case file the way Form 211 does, but it does alert the agency to a potential problem. Response time varies; the IRS may investigate immediately or may add the information to a file if they are already investigating the same person or business.

Local IRS offices also accept written reports by mail. You can find the address of your local office on the IRS website or by calling the main IRS line. Include as much detail as you can — account numbers, business registration numbers, names of accomplices, and copies of documents if you have them safely obtained them.

Reporting to state tax authorities and other agencies

If the fraud involves state income tax, you can report it to your state's department of revenue or tax authority. Most states have their own fraud hotlines or online reporting systems. State agencies often move faster than the federal IRS and may pursue cases the IRS does not prioritize.

If the fraud is connected to other crimes — such as money laundering, identity theft, or wire fraud — you can also report it to the FBI, the Secret Service, or your local police department. The FBI has a white-collar crime division and accepts tips through its website. These agencies may investigate in parallel with the IRS or may take the lead depending on the nature of the crime.

If you suspect an IRS employee is involved in the fraud or is helping someone commit it, report that to TIGTA (Treasury Inspector General for Tax Administration). TIGTA investigates misconduct by IRS staff and can be reached through its website or by calling the TIGTA hotline.

What information to gather before you report

The more detail you provide, the more seriously the IRS will treat your report. Gather the following if you have access to it: the full legal name and address of the person or business committing fraud, their Social Security number or Employer Identification Number (EIN), the years in question, the type of fraud (unreported income, false deductions, inflated business expenses, payroll tax evasion), and the approximate amount of money involved.

If you have documents — such as bank statements, invoices, emails, or tax returns — make copies and include them with your report. Do not send originals. If you obtained documents illegally or in violation of a confidentiality agreement, note that in your report; the IRS can still use the information, but it affects how they proceed. If you are an employee reporting your employer, keep copies of your report for your own records in case you face retaliation.

Write down dates and times of conversations or events that made you suspicious. For example, if you overheard a conversation about hiding income, note the date, who was present, and what was said. If you saw a document, describe it — what it was, when you saw it, and where it is now. Specific details make your report more credible and easier for investigators to follow up on.

Understanding the investigation process and timeline

After you report fraud, the IRS does not provide updates on the status of an investigation. If you filed Form 211 and are waiting for a reward decision, you will not hear back for months or years. The IRS may contact you for more information, but this does not mean they are actively investigating — they may simply be clarifying details in your report.

Criminal investigations by the IRS typically take 2 to 5 years from the time a case is opened to the time charges are filed or a settlement is reached. Civil cases (where the IRS seeks back taxes and penalties without criminal prosecution) move faster, sometimes 1 to 2 years. You will not be told which type of case yours is or when it concludes.

If your report leads to a prosecution and conviction, you may read about it in news reports or court records, but the IRS will not contact you to say so. If you filed for a reward, you can check the status by contacting the IRS Whistleblower Program office directly, though they will only confirm whether a case is open or closed, not the details.

Protecting yourself when reporting fraud

If you are reporting your employer or a business partner, understand that retaliation is illegal but can happen. Document everything — keep copies of your report, the date you filed it, and any communications you have with the IRS or other agencies. If you face negative consequences at work after reporting, you may have legal recourse under whistleblower protection laws, though these vary by state and industry.

Do not discuss your report with coworkers or the person you are reporting unless you have a legal reason to do so. The more people who know, the greater the risk that word gets back to the person under investigation, which can compromise the case. If you are required to testify in a criminal case, the IRS or prosecutor will contact you; you do not need to volunteer to appear.

If you are concerned about your safety or job security, consult an employment lawyer before filing your report. Some lawyers specialize in whistleblower cases and can advise you on your rights and the best way to proceed.

Frequently Asked Questions

Can I report tax fraud anonymously?

Yes. You can mail a letter describing the fraud to your local IRS office without signing your name, or use the online tip line without providing contact information. However, you will not be may be able to access for a reward, and the IRS cannot contact you with questions or updates. Providing your name and phone number increases the chances your report will be investigated thoroughly.

What happens if my report turns out to be wrong?

If you report in good faith — meaning you had reasonable grounds to suspect fraud — you are protected from liability even if the IRS later determines no fraud occurred. However, if you knowingly file a false report to harm someone, you can face criminal charges for filing a false statement. Most reports that do not result in prosecution simply close without further action.

How much money can I get if the IRS recovers funds?

The reward is 15 to 30 percent of money recovered, but only if the case results in a successful prosecution, settlement, or judgment and the total recovery exceeds $2 million. If the IRS recovers $5 million, for example, your reward would be between $750,000 and $1.5 million. Rewards are paid after the case is closed and money is collected, which can take several years.

Do I have to report fraud if I know about it?

No. Reporting fraud is voluntary. However, if you are involved in the fraud yourself or knowingly help someone commit it, you can face criminal charges. If you are a tax professional or accountant and you know a client is committing fraud, you have ethical obligations that may require you to withdraw from representing them, though you are generally not required to report them to the IRS.

Can I report fraud if I am not a U.S. citizen?

Yes. The IRS accepts reports from anyone, regardless of citizenship or immigration status. You can report anonymously if you are concerned about your status. Reporting fraud does not affect your immigration case or create a record that will be used against you in other proceedings.