Where and how to report suspected tax fraud

You can report suspected tax fraud to the IRS through their online form, by mail, or by phone. The most direct route is the IRS Criminal Investigation tip line at 1-800-366-4484, which connects you to a live person who can take details about what you've observed. If you prefer to submit information in writing, you can use Form 3949-A (Information Referral) or send a letter describing the suspected fraud to your local IRS Criminal Investigation office.

The online option is the IRS website at www.irs.gov/compliance, where you'll find a form to report suspected tax evasion. This route works well if you have documentation — receipts, statements, or other records — that you can describe in detail. You don't need to provide your name, though doing so allows the IRS to follow up with you if they need clarification.

Before you report, gather what you know: the person's or business's name, their tax identification number or Social Security number if you have it, the years involved, and a description of what makes you believe fraud is occurring. The more specific you are, the more useful your report becomes to investigators.

Key Takeaways

  • The IRS Criminal Investigation tip line at 1-800-366-4484 is the fastest way to report suspected tax fraud to a person who can document your information.
  • You can also submit Form 3949-A by mail or file a report online through the IRS website without providing your name.
  • Provide as much detail as possible: the person's or business's name, tax ID, the years involved, and specific examples of the suspected fraud.
  • The IRS does not pay informants for reports of individual tax fraud, though whistleblowers in certain cases involving large amounts may be may be able to access for rewards under a separate program.
  • Your report is confidential; the IRS does not disclose the identity of people who report fraud.

What counts as tax fraud the IRS investigates

Tax fraud means deliberately providing false information on a tax return to reduce the amount of tax owed. This includes claiming deductions you didn't actually incur, reporting income that doesn't exist, inflating business expenses, hiding cash income, or claiming dependents who don't may have access to. The key word is deliberate — a mistake or misunderstanding on a return is not fraud.

The IRS distinguishes between tax evasion (criminal fraud) and tax avoidance (legal tax planning). Evasion involves hiding income or falsifying records. Avoidance involves using legal strategies to reduce what you owe. If someone is using aggressive but legal tax shelters, that's not something Criminal Investigation typically pursues. If they're hiding income or creating fake deductions, that is.

Common examples the IRS investigates include a business owner reporting personal expenses as business deductions, a contractor reporting little or no income while living a high-income lifestyle, a person claiming a child as a dependent on multiple returns, or someone using offshore accounts to hide income from the IRS.

Reporting fraud involving a business or employer

If you suspect a business is committing tax fraud — perhaps you work there and see the owner reporting personal expenses as business costs, or you notice the company reports far less income than it actually receives — you can report this through the same channels as individual fraud. Call 1-800-366-4484 or submit Form 3949-A to your local IRS Criminal Investigation office.

For a business, include the company name, the owner's name if you know it, the business address, and the tax identification number (EIN) if available. Describe what you've observed: for example, "The owner uses the business account to pay personal credit card bills and deducts them as office supplies" or "The restaurant reports $50,000 in monthly revenue but I process $200,000 in credit card transactions monthly."

If you are an employee reporting your own employer, you may also consider consulting an employment attorney about whistleblower protections in your state. The IRS does not protect employees from retaliation, but some states have laws that do.

The difference between reporting fraud and the whistleblower reward program

Most people who report tax fraud do not receive money for doing so. However, the IRS does have a Whistleblower Program that pays rewards in specific cases. You are only may be able to access if the amount in dispute is over $2 million and the case involves a person or business with a gross income of more than $200,000. The reward ranges from 15 to 30 percent of the taxes, penalties, and interest the IRS collects as a result of your information.

To pursue a whistleblower claim, you file Form 211 (process for Award for Original Information) with the IRS Whistleblower Office. This is a formal process that takes time — the IRS investigates, collects, and then determines your reward. You can file Form 211 at the same time you report the fraud through the tip line, or separately.

If the suspected fraud does not meet the dollar thresholds, you can still report it through the tip line or Form 3949-A, but you should not expect a financial reward. Many people report fraud for other reasons: they witnessed illegal activity, they want to level the playing field for honest taxpayers, or they have a personal dispute with someone and want the IRS to examine their return.

What happens after you report

After you submit a report, the IRS does not typically tell you what action they take. Criminal Investigation receives thousands of tips each year and prioritizes cases based on the amount of money involved, the strength of the evidence, and the resources available. A report you file may lead to an audit, a criminal investigation, or no action at all.

If your report leads to a criminal prosecution and conviction, you may learn about it through public court records. However, the IRS will not contact you to update you on the status of your case unless you filed a Form 211 whistleblower claim, in which case the Whistleblower Office will notify you of the outcome and any reward decision.

Do not expect a quick resolution. Criminal investigations can take years. If you filed Form 211, the IRS has up to two years to make a information, though cases often take longer.

How to report fraud you witnessed at a financial institution

If the suspected fraud involves a bank, credit union, investment firm, or other financial institution — for example, an employee helping a customer hide income or a manager falsifying records — you can report it to the IRS, but you should also report it to the institution's compliance department and to the appropriate financial regulator.

For a bank or credit union, contact the Office of the Comptroller of the Currency (OCC) at 1-800-613-6743 or the Consumer Financial Protection Bureau (CFPB) at consumerfinance.gov. For investment fraud, contact the Securities and Exchange Commission (SEC) at sec.gov/tcr. These agencies work with the IRS on cases involving tax fraud, and reporting to both increases the likelihood of investigation.

You can still file a Form 211 whistleblower claim with the IRS if the case meets the dollar threshold, even if you've also reported to other agencies.

Protecting yourself when you report

The IRS keeps the identity of people who report fraud confidential. You do not have to provide your name when you call the tip line or submit a report online. If you do provide your name, the IRS will not share it with the person or business you're reporting without a court order, which is rare.

If you are reporting your employer or someone you know personally, consider whether you want to remain anonymous. Calling the tip line and not providing your name is the most private option. If you file Form 211 for a whistleblower reward, you will have to identify yourself because the IRS needs to know who to pay.

If you believe reporting could put you at physical risk, consult an attorney before you report. Some employment situations have legal protections for whistleblowers, and an attorney can advise you on your specific circumstances.

Frequently Asked Questions

Do I have to provide my name when I report tax fraud?

No. You can call the IRS Criminal Investigation tip line at 1-800-366-4484 or submit a report online without providing your name. If you file Form 211 for a whistleblower reward, you must identify yourself because the IRS needs to know who to send the payment to.

What if I'm not sure whether something is fraud or just aggressive tax planning?

If you're uncertain, you can still report it. Describe what you observed in detail and let the IRS determine whether it meets the threshold for fraud. The tip line operator can also ask clarifying questions to help you decide whether to proceed.

Can I report tax fraud anonymously if I work for the IRS or a government agency?

Yes, but you should also contact your agency's Office of Inspector General, which has a separate confidential hotline for federal employees. The OIG investigates fraud within federal agencies and can protect you under whistleblower laws that explore to government workers.

What if the person I'm reporting is a family member?

You can report family members through the same process. Remaining anonymous by calling the tip line and not providing your name is an option if you're concerned about family conflict. If you file Form 211, your name will be part of the record.

How long does it take for the IRS to investigate after I report?

There is no set timeline. The IRS prioritizes cases based on the amount of money involved and available resources. Some cases are resolved within a year; others take several years. If you filed Form 211, the IRS aims to make a information within two years, though many cases extend beyond that.