You can sue someone for lying, but only when the lie fits a recognized legal theory and you can prove each of its elements. The question is not whether the person lied; it is what kind of harm the lie caused and whether the law provides a claim for that harm. The three claims that cover most situations are defamation for lies that damage your reputation, fraud for lies that cost you money, and intentional infliction of emotional distress for lies that cause severe psychological harm. Perjury, the criminal offense of lying under oath, is usually not something a private person can sue over at all.
Which claim fits your situation determines everything else: what you have to prove, how long you have to file, and what you can recover.
If the Lie Damaged Your Reputation: Defamation
Defamation covers false statements of fact that harm your reputation. Written or published statements are libel; spoken ones are slander.1Legal Information Institute. Defamation To win, you have to show the defendant made a false statement of fact, communicated it to at least one other person, and caused you harm. Opinions do not qualify, no matter how harsh, because defamation requires a claim that can be proven false.
The proof standard depends on who you are. Public figures must show “actual malice” — that the defendant knew the statement was false or acted with reckless disregard for the truth.2Cornell Law School. New York Times v Sullivan 1964 Private individuals have an easier path; states may allow recovery on a showing that the defendant was merely negligent about the truth.3Cornell Law School. Elmer Gertz, Petitioner, v Robert Welch, Inc
When Harm Is Presumed: Slander Per Se
Most slander claims require you to prove specific financial losses. Slander per se is the exception. If the false spoken statement falsely accuses you of a crime, imputes a contagious or sexually transmitted disease, alleges sexual misconduct, or attacks your professional competence or business reputation, courts presume harm and you can recover without documenting every dollar you lost. Categories vary slightly by state.
Statements the Law Protects
Some false statements cannot be sued over at all. Absolute privilege shields statements made during judicial proceedings, legislative debates, and by government officials acting in their official capacity, no matter how false or malicious.4Legal Information Institute. Absolute Privilege Qualified privilege is narrower and covers good-faith statements where the speaker has a legitimate reason to communicate the information, such as an employer giving a job reference. You can defeat qualified privilege by showing the speaker acted with malice.
If the Lie Cost You Money: Fraud
Fraud targets lies that tricked you into a decision that cost you financially. Courts require six elements: the defendant made a statement, the statement was false, the defendant knew it was false or made it recklessly, the defendant intended you to rely on it, you did rely on it, and you suffered financial harm as a result.5Legal Information Institute. Fraudulent Misrepresentation Every link matters. If you cannot show that you actually relied on the false statement, the claim fails even if the lie was outrageous.
Negligent misrepresentation is a related, less demanding claim. Instead of proving the defendant lied on purpose, you show they made a false statement without any reasonable basis for believing it was true and intended you to rely on it. This often comes up with professionals like accountants or appraisers who provide inaccurate information without exercising proper care. Damages tend to be smaller, but the lower intent requirement makes it easier to prove.
If the Lie Caused Severe Emotional Harm: IIED
When lies cause serious psychological injury rather than financial or reputational damage, intentional infliction of emotional distress may fit. The bar is high. You must show the defendant acted intentionally or recklessly and that the conduct was so extreme it exceeds all bounds of decency tolerated in a civilized society.6Cornell Law School. Mental Anguish A hurtful or cruel lie, by itself, is usually not enough.
The distress also has to be severe, and courts scrutinize the evidence closely. Medical records, therapist notes, and prescription histories carry far more weight than testimony alone.6Cornell Law School. Mental Anguish Without professional documentation, these claims tend to fall apart.
If Someone Lied Under Oath: Perjury Is Usually Not a Civil Claim
Perjury is a criminal offense: knowingly making a false statement, under oath, on a matter material to the proceeding.7Legal Information Institute. Perjury Under federal law it carries up to five years in prison, a fine, or both.8Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally
If someone’s perjury harmed you in a civil case, your options are limited. American courts generally do not allow private lawsuits for damages caused by another person’s perjury. The usual remedy is to ask the court to vacate the tainted judgment, not to file a separate suit. Only a handful of jurisdictions recognize narrow exceptions.
Defenses That Kill Weak Cases
Before filing anything, think about how the other side will respond. Three defenses end most losing cases.
Truth. Truth is a complete defense to defamation.1Legal Information Institute. Defamation The statement does not need to be perfectly accurate in every detail; substantial truth is enough. That is why defamation cases turn on provably false factual claims, not unflattering characterizations.
Opinion. Pure opinions cannot be proven true or false and are not actionable. “I think she’s dishonest” is opinion. “She embezzled $50,000 from the company” is a factual claim. Courts look at the full context to decide whether a reasonable listener would take the statement as asserting a verifiable fact.1Legal Information Institute. Defamation
Anti-SLAPP motions. This is the defense plaintiffs most often overlook, and it can be financially devastating. Roughly 39 states and the District of Columbia have anti-SLAPP statutes that let defendants move for quick dismissal of suits targeting constitutionally protected speech. Once the motion is filed, you have to show at an early stage that your case has real merit. If you cannot, the case is thrown out and you may be ordered to pay the defendant’s attorney fees and costs. In a state with a strong anti-SLAPP law, filing a weak defamation claim can cost you more than the original lie did.
Filing Deadlines Are Short
Every claim has a statute of limitations. Miss it and the courthouse door closes for good.
Defamation deadlines are the tightest: usually one or two years from the date the statement was published or spoken. A few states allow up to three years; some allow as little as six months for slander.
Fraud deadlines are longer, typically three to six years, and many states apply a discovery rule that delays the start of the clock until you knew or should have known about the fraud. Once you have enough information to suspect something was wrong, the clock starts, even if you have not confirmed every detail.
Emotional distress claims generally fall in the one-to-three-year range. Perjury, as a criminal matter, is governed by criminal statutes of limitations that only prosecutors can act on.
What You Can Recover
Compensatory damages cover your actual losses. In a defamation case, that includes lost income, diminished earning capacity, lost business opportunities, and the reputational harm itself. In a fraud case, they aim to put you back in the financial position you would have been in if the lie had never been told, including downstream losses tied to the fraud.5Legal Information Institute. Fraudulent Misrepresentation
Punitive damages are available in some defamation and fraud cases involving egregious conduct, and generally require a showing of actual malice or deliberate intent to harm. Constitutional limits apply. The Supreme Court has held that punitive awards exceeding a single-digit multiple of compensatory damages will rarely survive due process review, and when compensatory damages are already substantial, courts may limit the ratio to 1:1.9Justia. State Farm Mut Automobile Ins Co v Campbell, 538 US 408 2003
Nominal damages, sometimes as little as a dollar, let a court formally recognize that your rights were violated when you cannot prove significant financial loss. In defamation per se cases, where harm is presumed, they can still support a judgment in your favor and a public record that the defendant lied.
What to Do Before You File
Preserve evidence immediately. Screenshot social media posts, save texts, download emails, and keep copies of any document showing the false statement. Social media content can be deleted at any time, so capture it before the other side realizes you are considering legal action. For important posts, a web archiving service is harder to challenge than a screenshot.
Consider a cease and desist letter. It formally puts the other person on notice that the statements are false and demands they stop. The letter itself has no legal force, but it sometimes ends the situation without litigation, and if the person keeps repeating the lie afterward, the letter becomes evidence that they knew the statement was false.10Legal Information Institute. Cease and Desist Letter An attorney-drafted letter carries more weight, though it is not required.
Calculate your actual losses before spending money on a lawsuit. Lost clients, declined job offers, medical bills for anxiety treatment, and online reputation repair all factor into whether the potential recovery justifies the cost. Attorney fees for civil litigation commonly run $200 to $450 per hour depending on location and experience, and court filing fees vary by jurisdiction. If your provable losses are modest, a demand letter or small claims filing may make more sense than a full civil suit.
Consult an attorney early. A defamation or fraud lawyer can tell you which theory fits, where your case is weak, and what it is realistically worth. Many offer reduced-rate initial consultations or contingency arrangements for strong cases, and the earlier you bring one in, the better your chances of meeting deadlines and preserving evidence before it disappears.