To anonymously report illegal gambling, you have four practical channels: the FBI’s electronic tip form at fbi.gov/tips, IRS Form 3949-A (with the personal-information section left blank), your state gaming commission or local police non-emergency line, and third-party services like Crime Stoppers. None of these require your name. The right choice depends on the size of the operation, whether you want a possible reward, and how much distance you want between yourself and the agency receiving the tip.
What to Have Ready Before You File
Specific tips get worked; vague ones sit. Federal law defines an illegal gambling business as one involving five or more people that has either run for more than 30 consecutive days or taken in at least $2,000 in gross revenue on a single day.{1Office of the Law Revision Counsel. 18 USC 1955 – Prohibition of Illegal Gambling Businesses} That bar is lower than many people assume, so details that seem small on their own can be enough to show an operation qualifies.
For a physical operation, write down the street address, the days and hours it runs, a rough count of workers and customers, and any names or aliases you have heard. For an online platform, capture the website URL or app name, take screenshots of the betting interface, and save any payment confirmation emails. If the operation accepts cryptocurrency, wallet addresses are especially useful because blockchain transactions leave a permanent trail.
Money details carry the most weight. Estimate cash amounts if you have seen them change hands. Note any payment platforms involved, such as Venmo, Zelle, Cash App, or crypto exchanges. IRS Form 3949-A specifically asks for banks and financial institutions the target uses, plus estimated unreported income broken out by tax year.{2Internal Revenue Service. Form 3949-A – Information Referral} A partial picture is still useful. Report what you actually know, and separate what you saw yourself from what you heard secondhand.
Submitting an Anonymous FBI Tip
The FBI’s electronic tip form at fbi.gov/tips is the most direct federal route, and it is submitted over a secure connection with HTTPS encryption.{3Federal Bureau of Investigation. Electronic Tip Form} You do not have to enter your name or contact information. Use the category menus to identify the type of activity, then use the narrative box to lay out who, what, where, and when in plain language.
The FBI is most interested in operations tied to organized crime, corruption of public officials, or interstate activity. If the operation you are reporting takes bets across state lines through internet or wire communications, say so directly. Transmitting wagering information across state lines by wire is a separate federal offense carrying up to two years in prison.{4Office of the Law Revision Counsel. 18 USC 1084 – Transmission of Wagering Information}
Filing IRS Form 3949-A Without Your Name
Illegal gambling operations almost always generate unreported income, which makes Form 3949-A a strong second channel even when the FBI is the natural home for the criminal side. The IRS now accepts Form 3949-A through an online submission option in addition to the paper form.{5Internal Revenue Service. About Form 3949-A, Information Referral}
The form uses structured fields: the name and address of the person or business, estimated unreported income by tax year, the type of tax violation, and a narrative section.{2Internal Revenue Service. Form 3949-A – Information Referral} Check the box for unreported income involving cash or untraceable payments if the operation deals mostly in cash, and list any banks or financial institutions the target uses.
Section C asks for your personal information, and the form itself states that this section is not required to process the report.{} Leave it blank if you want to stay anonymous. The IRS says it does not share reporter information with the target, but skipping Section C keeps your identity out of the file entirely. If you prefer to mail a paper copy, the address is Internal Revenue Service, PO Box 3801, Ogden, UT 84409.{2Internal Revenue Service. Form 3949-A – Information Referral}
State Gaming Commissions and Local Police
Most states have a gaming commission or regulatory board that handles complaints about unlicensed gambling. These agencies are listed on official state government websites and typically take tips by phone, mail, or online portal. For a large commercial operation like an unlicensed casino or sportsbook, the state gaming regulator often has investigators who specialize in exactly this work.
For a smaller operation with immediate public safety concerns, such as a gambling house in your neighborhood where you have seen violence or drug activity, local police are the better first call. Use the non-emergency line unless someone is in immediate danger. Many departments accept anonymous tips through their websites as well.
The Department of Justice has said that federal syndicated gambling laws target operations of “major proportions,” with priority on organized crime, corruption, and businesses that are substantial and extraordinary for the region.{6United States Department of Justice Archives. 2085. Syndicated Gambling} A neighborhood card game is unlikely to draw federal attention; a large unlicensed sportsbook processing six figures in bets is another matter. When you are not sure which level of government fits, report to both. Filing with multiple agencies is not a problem, and it raises the odds the information reaches someone with jurisdiction.
Crime Stoppers for the Strongest Anonymity
If keeping any thread back to you off the record matters more than anything else, Crime Stoppers puts a buffer between you and law enforcement. The program operates in all 50 states and accepts tips by phone at 1-800-222-TIPS, through the website, and through mobile apps.{7Crime Stoppers USA. Submit A Tip}
When you submit, you receive a secret code number that becomes your only identifier. You never give your name, and the system is designed so that even Crime Stoppers staff cannot determine who you are.{7Crime Stoppers USA. Submit A Tip} That code lets you check back for follow-up questions or updates without revealing yourself. Crime Stoppers forwards the scrubbed tip to the appropriate law enforcement agency.
Local Crime Stoppers programs also pay cash rewards, generally from $1 to $1,000, for tips that lead to felony arrests.{8Crime Stoppers USA. Profile} Each local board sets its own amount. Rewards are paid using the secret code, so you can collect without identifying yourself.
Larger Rewards Mean Giving Up Anonymity to the Agency
If the operation moves serious money, two federal whistleblower programs pay far more than Crime Stoppers, but neither lets you stay anonymous to the government. You stay anonymous to the target only.
The IRS Whistleblower Office pays awards of 15 to 30 percent of the total tax collected, including penalties and interest, when your information leads to a successful enforcement action. To qualify for a mandatory award, the tax in dispute must exceed $2 million, and if the target is an individual, their gross income must exceed $200,000 in at least one of the relevant tax years.{9Office of the Law Revision Counsel. 26 USC 7623 – Expenses of Detection of Underpayments and Fraud, Etc.} Claims below those thresholds can still receive a smaller discretionary award.{10Internal Revenue Service. Submit a Whistleblower Claim for Award} You file on IRS Form 211, and unlike Form 3949-A, this process requires you to identify yourself to the IRS.
The Treasury Department’s Financial Crimes Enforcement Network runs a separate whistleblower program covering money laundering and Bank Secrecy Act violations. When information leads to penalties over $1 million, awards run from 10 to 30 percent.{11Financial Crimes Enforcement Network. Whistleblower Program} The program is still being implemented through rulemaking, so processing and payment timelines are not yet settled. Gambling operations that launder proceeds through shell companies or crypto exchanges can fall within its scope.
If staying completely unidentifiable matters more than a potential payout, use Crime Stoppers or an unsigned Form 3949-A instead.
Where Anonymous Reporting Stops Protecting You
Anonymous tips launch investigations, but they have limits worth knowing before you file. If your tip leads to criminal charges and the case goes to trial, your identity could be revealed. In Roviaro v. United States (1957), the Supreme Court held that the government’s privilege to protect informant identities gives way when disclosure is relevant and helpful to the defense or essential to a fair trial. Courts weigh the public interest in the flow of information against the defendant’s right to prepare a defense.
In practice, most gambling cases end in plea deals, and anonymous tipsters are rarely called to testify. The possibility exists, though, and no reporting channel can guarantee a court will never order disclosure. If you took part in the gambling yourself, understand that a report could theoretically expose your own role. Anonymity reduces that risk substantially without eliminating it.
One risk applies whether you sign your name or not: knowingly filing a false report with a federal agency is itself a crime. A materially false statement to the government carries up to five years in prison under federal law.{12Office of the Law Revision Counsel. 18 USC 1001 – Statements or Entries Generally} Stick to what you have actually observed, and be clear in the narrative about which details are firsthand and which came from someone else.