What Is a Statute of Limitations?

A statute of limitations is a law that sets a strict time limit on how long you have to file a lawsuit after an event. Think of it as a countdown that starts when you are harmed. Once it reaches zero, the courthouse doors close on your claim — even if you would otherwise have won.

These deadlines apply to almost every kind of civil claim: car accidents, medical malpractice, broken contracts, defamation, unpaid debts, and more. The exact length depends on two things: where the claim arose (each state, and each country, sets its own rules) and what type of claim it is.

Why Do Statutes of Limitations Exist?

The law imposes these deadlines for several practical and fairness-based reasons:

• Evidence degrades over time. Documents are lost, physical evidence disappears, and witnesses' memories fade.
• Fairness to defendants. People and businesses should not have to defend against decades-old allegations indefinitely.
• Encouraging diligence. The rule nudges people to pursue valid claims promptly, while the facts are fresh.
• Legal finality. At some point, past disputes need to be settled so everyone can move on.

When Does the Clock Start?

Usually, the clock starts on the date of the event that caused your harm — the day of the accident, the breach of contract, or the defamatory statement. But there is a major exception: the discovery rule.

Under the discovery rule, the clock starts when you knew or reasonably should have known about your injury and its cause. This matters for harms that are not immediately obvious — for example, a surgical sponge left inside a patient, or an asbestos disease that takes decades to appear. Without the discovery rule, many victims would be time-barred before they even realized they were hurt.

What Happens If You Miss the Deadline?

If you file a lawsuit after the statute of limitations has expired, the defendant will almost certainly ask the court to dismiss it as "time-barred." In most cases, the court will agree, and your claim will be thrown out regardless of its merits. This is why understanding your deadline early is so important — and why even a strong case has no value if filed too late.

A time-barred claim is one of the most painful outcomes in civil law: a valid injury with no remedy, simply because the clock ran out.

Can the Deadline Be Paused or Extended?

Yes. The legal term for pausing the clock is tolling. The most common situations include:

• Minor plaintiffs — the clock often does not start until the person turns 18.
• Military service — federal law (the SCRA) can pause the clock during active duty.
• Defendant absent from the state — many states pause the clock while the defendant is away.
• Legal incapacity — the clock may pause while a person is legally unable to act.
• Fraudulent concealment — if the defendant hid their wrongdoing, the clock may pause until you discover it.

Read our full guide to tolling to see how each one works.

Statute of Limitations vs. Statute of Repose

These two are easy to confuse. A statute of limitations runs from when your claim accrues (often the injury or its discovery). A statute of repose is an absolute outer deadline that runs from a fixed event — like the date a product was sold or a building was completed — and can bar a claim even before you discover the harm. Some claim types, such as medical malpractice and product liability, are subject to both.

Frequently Asked Questions

Ready to find your specific deadline? Try the free statute of limitations calculator — select your state and claim type, enter your incident date, and see exactly how much time you have left.