Free Guide to Reporting Tax Fraud to the IRS

Understanding Tax Fraud and Why the IRS Wants to Know

Tax fraud occurs when someone intentionally provides false information on a tax return to reduce the amount of taxes they owe. This is different from making an honest mistake on your return. The IRS distinguishes between errors (which are mistakes) and fraud (which is deliberate deception). Common forms of tax fraud include reporting false business expenses, hiding income, claiming fake dependents, inflating charitable donations, or misrepresenting the cost basis of investments.

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The IRS takes tax fraud seriously because it affects everyone. When some people cheat on their taxes, the burden falls on honest taxpayers to make up the difference. According to the Treasury Inspector General for Tax Administration, the "tax gap"—the difference between taxes owed and taxes actually paid—was estimated at $441 billion for tax years 2011-2013. Reducing this gap depends partly on reports from people who witness tax fraud firsthand.

You might encounter tax fraud in various situations. Perhaps a business owner reports inflated expenses to a lender while claiming different numbers to the IRS. A contractor might ask you to pay them "under the table" to avoid reporting income. A family member might claim dependents who don't actually live with them. An employer might not report wages paid to workers. These situations represent real opportunities to report what you've observed.

The IRS maintains a dedicated program specifically to receive information about suspected tax fraud from the public. This program exists because IRS employees cannot personally investigate every suspicious tax return. People in the community—employees, customers, competitors, neighbors, and family members—often have direct knowledge of tax violations that the IRS would never discover otherwise.

Practical takeaway: Understanding what constitutes tax fraud helps you recognize situations where reporting might be appropriate. Tax fraud involves intentional misrepresentation, not honest errors or different interpretations of tax law. Consider whether the situation you've observed involves someone deliberately providing false information to the IRS.

Types of Tax Fraud You Might Witness

Tax fraud takes many forms, and recognizing these patterns helps you determine whether a situation warrants reporting. One common type is unreported cash income. Small business owners, service providers (plumbers, electricians, hairdressers), and gig workers sometimes accept payment in cash and deliberately fail to report this income on their tax returns. If you know a business is conducting substantial cash transactions but the owner claims little to no income, this is a potential fraud indicator.

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False deductions represent another major category. Business owners might claim personal expenses as business expenses—for example, claiming a vacation as a business conference, or listing a family member's salary as an employee when they performed no actual work. Self-employed individuals might claim 100% of home office expenses when they use the space for personal purposes. These deductions reduce reported income fraudulently.

Dependent fraud occurs when someone claims children, relatives, or even unrelated individuals as dependents to receive child tax credits or increase deductions, when those people don't actually live with them or meet IRS requirements. Each dependent claimed fraudulently can result in thousands of dollars in tax benefits obtained improperly.

Other forms include underreporting business revenue by keeping incomplete records, claiming fictitious business losses, inflating charitable donations, hiding income in offshore accounts, or deliberately structuring bank deposits to avoid reporting requirements. Some people misrepresent the basis or cost of investments to claim false losses. Others claim credits they don't deserve, such as the Earned Income Tax Credit when they don't meet income requirements.

Employment-related fraud can also occur when employers don't issue required tax forms (W-2s or 1099s), pay employees without withholding required taxes, or misclassify employees as independent contractors. Some businesses run "off the books" operations where no records are maintained.

Practical takeaway: Familiarize yourself with common fraud patterns so you can identify actual violations versus legitimate tax strategies. Someone using aggressive but legal tax positions is different from someone deliberately hiding income or claiming false deductions. Understanding this distinction helps you decide whether reporting is appropriate.

Where and How to Report Tax Fraud to the IRS

The IRS provides a specific program called the Whistleblower Program, which receives information about suspected tax fraud from the public. This program has been operating since 1867 and handles thousands of reports annually. During 2023, the IRS received over 19,000 whistleblower submissions through its official channels.

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You can submit information about suspected tax fraud in several ways. The primary method is completing Form 13909, which is titled "Information Referral." This form asks you to provide details about the suspected fraud, including the name and address of the person or business, the specific tax violations you believe occurred, and any relevant facts or documents you can provide. The IRS provides this form on its official website at irs.gov.

To file Form 13909, you can mail the completed form to: Internal Revenue Service, Attention: Whistleblower Program, 1111 Constitution Avenue NW, Washington, D.C. 20224. You can also submit the form electronically through the IRS website. The IRS accepts anonymous reports, though providing your contact information allows them to follow up with you if they need additional details. Many people choose to remain anonymous, and the IRS accommodates this.

When completing Form 13909, include as much specific information as possible. Describe what you observed, when you observed it, and any documents that support your suspicion. For example, if you know someone is running an unreported cash business, describe the business, explain how you know it's generating income, and state whether you have any documentation. If you're aware of false deductions, explain what you know about the false claims.

The form also asks whether you are reporting on behalf of yourself, on behalf of another party, or on behalf of multiple parties. You indicate your relationship to the suspected tax evader (employee, customer, competitor, family member, etc.), which helps the IRS understand the context and reliability of your information.

Practical takeaway: The IRS Whistleblower Program provides a straightforward mechanism for reporting suspected fraud. Form 13909 is available online, and you can submit it by mail or electronically. Gather whatever documentation or details you can provide, and remember that anonymous reports are accepted. The more specific information you provide, the better positioned the IRS is to investigate.

What Information to Gather Before Reporting

Before submitting a report to the IRS, gathering relevant information strengthens your report and increases the likelihood of investigation. Start by documenting what you actually know versus what you suspect. The IRS will be most interested in facts you have direct knowledge of, not speculation. For example, if you worked for a business and saw invoices being created with false amounts, or if you know an individual's actual income because you're their employer or accountant, this firsthand knowledge is valuable.

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Collect any documents that support your suspicion. If you have copies of business records, invoices, bank statements, tax returns, employment records, or correspondence that demonstrates fraudulent activity, preserve these carefully. You don't need to submit originals—copies are sufficient. If you have photographs of business operations, vehicle registrations, property records, or other documentation, these can be helpful. Even personal notes you've made contemporaneously (around the time events occurred) can be valuable.

Write down specific details about what you observed. Include dates, amounts, names of people involved, and descriptions of the suspected fraudulent activity. For instance: "In January 2023, I saw the business owner pay $5,000 to Employee A in cash weekly without any written records or tax documentation." This is much more useful than "I think they're not reporting cash income."

Research public records if appropriate. You can often find business registration information, property records, vehicle registrations, and court documents through public databases. These records can corroborate your suspicions. For example, if someone claims to have limited income but owns multiple properties, this discrepancy might support a fraud suspicion.

Create a timeline of events and observations. If you've noticed suspicious activity over months or years, laying out the sequence helps reveal patterns. For example, you might note that a business operator consistently reports the same low income despite obviously busy operations during specific seasons.

Be prepared to provide names, addresses, phone numbers, business information, and identification numbers (Social Security Number, Tax ID, or EIN) for the person or business you're reporting. The more identifying information you can provide, the easier it is for the IRS to locate and