Telling someone you are going to sue them is not illegal in almost any ordinary situation. The right to access the courts is protected by the First Amendment, and communicating that you intend to file a lawsuit is a normal part of resolving a dispute. The narrow exceptions involve threats used to extract something you have no legal right to, threats of criminal prosecution tied to a payment demand, or lawsuit language wrapped around threats of violence.
Why the Threat Itself Is Protected
Filing a lawsuit is a form of petitioning the government, and the First Amendment protects not just the filing but the communications leading up to it. Courts have long recognized a litigation privilege that shields pre-suit statements from being used as the basis for defamation or other tort claims, so long as the statements are made in good faith and litigation is genuinely under consideration. The privilege reaches conversations, emails, and formal letters that outline a potential claim and what the speaker expects the other side to do about it.
You don’t have to be a lawyer to be protected. Anyone can say “I’m hiring an attorney” or “I intend to take you to court over this.” On their own, those statements carry no legal risk. What courts look at is whether the speaker had a legitimate basis for contemplating litigation. If you do, the communication is protected even if a suit is never actually filed.
When a Lawsuit Threat Becomes Extortion
The line between a lawful warning and extortion comes down to what you are demanding and whether it connects to a real legal claim. Under the Hobbs Act, federal extortion means obtaining someone’s property through wrongful use of threatened force, violence, or fear.1Office of the Law Revision Counsel. 18 USC 1951 – Interference With Commerce by Threats or Violence Telling someone, “pay me the $5,000 you owe me under our contract or I’ll sue,” is a legitimate demand tied to a real claim. Telling someone, “pay me $5,000 or I’ll file a lawsuit that will destroy your business,” when you have no actual claim starts looking like coercion.
The deciding factor is the relationship between the demand and the underlying dispute. If you are asking for money or action that would logically resolve a genuine grievance, the threat to sue is a standard negotiating tool. If you are leveraging the fear of litigation to extract something you have no right to, or to force unrelated behavior, prosecutors and courts treat that very differently.
Most state extortion statutes reflect the same principle. Many provide a defense when the property sought through a threat of legal action was honestly claimed as compensation for harm related to the dispute. The Model Penal Code, which has influenced most state criminal codes, does not criminalize threats of a lawsuit when the person is seeking restitution for harm connected to the threatened action. The trouble starts when the threat is unmoored from any legitimate claim.
Threatening Criminal Charges Is a Different Category
There is a significant legal difference between saying “I’ll sue you” and saying “I’ll have you arrested” or “I’ll report you to the police unless you pay me.” A federal statute specifically criminalizes demanding money in exchange for not reporting a federal crime, with penalties of up to one year in prison and fines.2Office of the Law Revision Counsel. 18 USC 873 – Blackmail
State laws reach further. Most state extortion statutes list threatening to accuse someone of a crime, expose embarrassing secrets, or damage someone’s reputation as specific forms of extortion. Threatening a civil lawsuit typically does not appear on those lists. The logic is that the civil court system exists for people to resolve money disputes, so threatening to use it is part of the process, while the criminal system exists to punish wrongdoing on behalf of society, so leveraging it for personal gain is treated as an abuse.
The practical takeaway is simple. You can tell someone you’ll sue them over a business dispute, a broken contract, or an unpaid debt. You should not tell someone you’ll call the police or press criminal charges unless they pay you, even if the underlying accusation is true. That second statement can land you on the wrong side of an extortion charge.
When Lawsuit Language Becomes a True Threat
A statement about suing someone almost never qualifies as a “true threat” under constitutional law, but the doctrine matters because some lawsuit threats get tangled up with language that does. The Supreme Court has held that the First Amendment does not protect true threats, meaning statements where a speaker communicates a serious intent to commit unlawful violence against a specific person or group.3Justia. Virginia v. Black, 538 U.S. 343 (2003) In 2023, the Court held in Counterman v. Colorado that prosecutors must prove the speaker consciously disregarded a substantial risk their words would be viewed as a threat of violence.4Justia. Counterman v. Colorado, 600 U.S. ___ (2023)
Saying “I’m going to sue you” does not come close to that threshold. It describes a legal process, not violence. But if someone says “I’m going to sue you and make sure you never feel safe again,” courts will look at the full context: the history between the parties, the specificity of the language, and whether a reasonable person would feel threatened with violence. When lawsuit language gets wrapped around implied physical threats, the speaker’s protection can evaporate.
Demand Letters: The Formal Version
Demand letters are the most common and formalized way of telling someone you plan to sue. An attorney or individual sends a written notice outlining the claim, the remedy sought, and a deadline to respond before litigation begins. These letters are squarely protected by litigation privilege and often resolve disputes without anyone having to go to court.
The protection applies when the sender has a good-faith basis for contemplating a lawsuit, and courts have held it covers letters where litigation was seriously considered even if a suit is never filed. The privilege shields the letter from being used as the basis for defamation, emotional distress, or similar claims.
A demand letter can still cause problems when it strays from legitimate claims. Letters containing knowingly false accusations, wildly inflated damage figures designed purely to intimidate, or threats of unrelated consequences like reputational harm move away from protected territory. Attorneys face additional constraints: a lawyer who signs a court filing certifies that the claims are warranted by existing law, have factual support, and are not filed for an improper purpose like harassment or delay.5Legal Information Institute. Federal Rules of Civil Procedure Rule 11 – Signing Pleadings, Motions, and Other Papers Those obligations cast a shadow backward onto demand letters.
What Happens If You Follow Through With a Baseless Suit
Telling someone you will sue is legal; actually filing a baseless lawsuit after making the threat is where consequences stack up.
Court Sanctions
If a frivolous lawsuit gets filed, the court can sanction the attorney or unrepresented party who filed it. Sanctions under Rule 11 must be limited to what is necessary to deter the conduct, but they can include monetary penalties paid to the court, orders directing payment of the other side’s attorney fees, and non-monetary directives like required legal education.5Legal Information Institute. Federal Rules of Civil Procedure Rule 11 – Signing Pleadings, Motions, and Other Papers Law firms can be held jointly responsible for violations committed by their attorneys. A separate federal statute allows courts to make an attorney personally pay the excess costs and fees generated by unreasonably and vexatiously multiplying proceedings.6Office of the Law Revision Counsel. 28 USC 1927 – Counsel’s Liability for Excessive Costs
Malicious Prosecution and Abuse of Process
A person who follows through on a baseless lawsuit threat and loses can face a counter-suit for malicious prosecution. The original defendant generally must show four things: the initial proceeding ended in their favor, the person who brought it lacked probable cause, the case was pursued with actual malice, and it caused real harm. Successful claims can produce compensation for attorney fees, reputational damage, and emotional distress, with punitive damages sometimes added.
Abuse of process is a related but distinct claim. It doesn’t require that the underlying case was baseless. Instead, it targets the misuse of a legitimate legal procedure for an improper purpose, such as using discovery to harass or leveraging a filed case to force an unrelated concession.
Vexatious Litigant Designations
For people who make a pattern of filing frivolous lawsuits, federal courts can declare the filer a vexatious litigant and impose a pre-filing injunction, which means the person must get court permission before filing any new lawsuit. Courts typically require a documented history of bad-faith filings before taking this step.
Civil Liability for Improper Threats
Even when a threat to sue does not rise to criminal extortion, it can still create civil liability. Publicly telling people that someone committed fraud and that you are suing them, without any factual basis for the fraud accusation, is not shielded just because the statement mentions litigation. The litigation privilege protects statements relevant to a genuinely contemplated lawsuit, not every false statement that happens to reference one.
A baseless threat can also support a tortious interference claim if it disrupts someone’s business relationships. Telling a company’s clients “we’re suing them for massive safety violations” when no such claim exists could cause real financial harm. If the threatened party can show the statements were false, caused a third party to break off a business relationship, and produced measurable financial loss, they have a viable claim.
The common thread is consistent across every one of these consequences. Legitimate threats tied to real disputes are protected. Threats used as weapons, disconnected from any genuine legal right, are not. If you have a real claim and you communicate it honestly, telling someone you plan to sue is one of the most routine things in the legal system. The people who get in trouble are almost always the ones who knew the threat had no substance and used it anyway.