A statute of limitations is a law that sets a deadline for filing a lawsuit or bringing criminal charges, and once that deadline passes, a court will refuse to hear the claim no matter how strong the underlying facts are. The specific window depends on the type of case and the jurisdiction: a personal injury suit might have two years, a written contract dispute four or more, most federal crimes five, and some tax matters anywhere from three years to forever. Understanding how the clock runs, when it pauses, and what resets it is often the difference between having a legal remedy and losing it permanently.
What the Deadline Actually Does
A statute of limitations is a procedural bar. It does not declare that nothing happened or that no wrong was done. It tells the court to turn the case away because too much time has passed. The reasoning is practical: witnesses move or die, documents disappear, and memories fade, so forcing people to act within a fixed window keeps evidence fresh and litigation fair.
The word “statute” means a law passed by a legislature rather than a rule developed by judges. Congress sets deadlines for federal claims, and each state legislature sets its own for state civil and criminal matters. The same type of case can have a two-year deadline in one state and a six-year deadline in another. For federal civil claims created by Congress after 1990, the default is four years unless the specific law says otherwise.1Office of the Law Revision Counsel. 28 USC 1658 – Time Limitations on the Commencement of Civil Actions Arising Under Acts of Congress
How Long You Have in a Civil Case
Civil deadlines usually run from one to six years. Personal injury claims commonly carry a two-year limit. Breach of a written contract often allows four years or more. Oral contracts and property damage claims typically fall in between. The exact number depends on your state and the type of claim.
When the Clock Starts
The deadline generally begins on the date the legal injury occurs, a concept lawyers call accrual. For a car accident, that is the day of the crash. For a broken contract, it is the day the other party failed to perform. The countdown starts when all the facts giving rise to the claim have happened and the injured person could, in theory, file suit.
An important exception is the discovery rule. Some injuries are hidden. If a surgeon leaves an instrument inside a patient, symptoms may not appear for years. In cases like that, the clock starts when the patient discovers the problem or reasonably should have discovered it. Federal courts generally apply this discovery-of-injury standard when a statute is silent on timing, and most states follow a similar approach for medical malpractice and latent property damage.
Contracts Can Shorten the Deadline
A written contract can sometimes impose a shorter deadline than the one set by law. For contracts involving the sale of goods, the default is four years, and the parties can agree to reduce it to as little as one year.2Legal Information Institute. UCC 2-725 – Statute of Limitations in Contracts for Sale Shortened periods appear in employment applications, service agreements, and invoices. Courts generally enforce them unless the window is so short that a person could not realistically discover a defect or bring a claim within it.
How Long Prosecutors Have in a Criminal Case
Prosecutors face deadlines too. For most federal crimes, the government has five years from the date of the offense to file charges.3Office of the Law Revision Counsel. 18 USC 3282 – Offenses Not Capital State deadlines vary: misdemeanors commonly allow one to three years, and felonies typically range from three to ten years depending on severity.
The biggest exception is for the most serious offenses. Under federal law, any crime punishable by death can be prosecuted at any time, with no deadline at all.4Office of the Law Revision Counsel. 18 USC 3281 – Capital Offenses The same is true in virtually every state for murder. This is why cold cases can be prosecuted decades later when new evidence, such as a DNA match, surfaces.
The clock stops once the government formally initiates prosecution, usually by filing an indictment or charging document. After that, separate rules govern how quickly the case must move to trial.
When the Clock Pauses
Certain circumstances “toll” the deadline, meaning the countdown freezes and then resumes later. Tolling exists because some situations make it genuinely impossible for someone to act in time.
- Minors. In most states, the clock does not start on a child’s claim until they turn eighteen. A child injured at age ten would typically have until two years after their eighteenth birthday to file a personal injury lawsuit.
- Mental incapacity. If a person is legally unable to manage their own affairs because of a mental disability, many states pause the deadline until the disability is removed or a guardian is appointed.
- Fleeing the jurisdiction. Federal law provides no statute of limitations protection for someone who flees from justice, and most states pause the clock whenever a defendant leaves the state to avoid service or prosecution.5Office of the Law Revision Counsel. 18 USC 3290 – Fugitives From Justice
- Bankruptcy. Filing for bankruptcy can pause collection deadlines against you while the case is pending.
Tolling rules differ significantly between states and between civil and criminal cases. Federal claims sometimes carry their own tolling rules that override state law entirely.
IRS Assessment and Collection
Tax law has its own set of deadlines, and two separate clocks run on different timelines.
How Long the IRS Has to Audit
The IRS generally has three years from the date you file a return to assess additional taxes.6Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection If you file early, the three years still runs from the original due date. Three exceptions can extend or eliminate that window:
- Substantial omission. Leaving off more than 25 percent of your gross income gives the IRS six years instead of three.6Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection
- Fraud. A fraudulent return or willful attempt to evade tax carries no deadline at all.6Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection
- Failure to file. If you never file a return, the clock never starts, and the IRS can assess taxes against you indefinitely.7Internal Revenue Service. Time IRS Can Assess Tax
Skipping a return does not make the problem disappear. It makes the deadline disappear, which gives the IRS unlimited time to act.
How Long the IRS Has to Collect
Once a tax has been assessed, the IRS has ten years to collect through levies, liens, or lawsuits.8Office of the Law Revision Counsel. 26 USC 6502 – Collection After Assessment After that, the debt becomes unenforceable. Certain actions pause the ten-year clock, including filing for bankruptcy, submitting an offer in compromise, or requesting a collection due process hearing. Each freezes the deadline while the matter is pending and effectively extends the collection window.
Old Debts and Time-Barred Collection
For many people, the most practical encounter with a statute of limitations involves old debts. Every state sets a deadline for how long a creditor or debt collector can sue to collect, typically three to six years depending on the type of debt. Once the deadline passes, the debt becomes “time-barred.” The debt technically still exists, but a court should not enforce it.
Federal law adds a layer of protection. Under Regulation F of the Fair Debt Collection Practices Act, a debt collector cannot sue or threaten to sue on a time-barred debt. The prohibition applies on a strict liability basis, so a collector violates it even without knowing the deadline had passed.9Federal Register. Fair Debt Collection Practices Act (Regulation F) – Time-Barred Debt Threatening a suit on a debt that cannot be legally enforced is inherently misleading.
Watch out for one trap. In many states, making even a small payment on a time-barred debt or acknowledging it in writing can restart the deadline from scratch. Collectors know this, and some will push for a token payment specifically to revive an expired claim. If you get a call about a very old debt, verify the age of the debt and your state’s deadline before saying anything or sending any money.
Statute of Repose: A Harder Deadline
A statute of repose looks similar but works differently in one crucial way. A statute of limitations runs from the date you are injured or discover harm. A statute of repose runs from a fixed event unrelated to any injury, such as the date a building was completed or a product was sold, and the discovery rule, tolling, and other equitable exceptions do not extend it.
The distinction matters most in construction and product liability cases. A state might give you three years from discovery of a defect to sue, while also imposing a ten-year outer limit measured from the date construction was finished. If you discover a structural problem in year eleven, the statute of repose blocks your claim even though you filed within three years of finding it. Statutes of repose are enforced more rigidly because their purpose is to provide an absolute cutoff for liability.
What Happens If the Deadline Is Missed
A late case is not automatically thrown out. The defendant has to raise it. Under the Federal Rules of Civil Procedure, a statute of limitations defense must be affirmatively stated in the defendant’s responsive pleading.10United States Courts. Federal Rules of Civil Procedure – Rule 8(c) If the defendant fails to raise it, the defense is typically waived and the case moves forward on the merits. State courts follow the same general principle.
This surprises people. A judge will not look at a late case and dismiss it on their own. The opposing side has to assert the defense, usually in their first formal response. Defendants who forget to include it can lose the protection entirely, even if the claim is years overdue.
Once the defense is properly raised and the court agrees the deadline has passed, the claim is time-barred. The court dismisses it, and no amount of strong evidence on the underlying facts will change the outcome. Whatever moral obligation may remain, the courts step aside and will not enforce it.