Personal injury and medical negligence claim time limits: The limitation period explained

Three years sounds like plenty of time. After a serious injury, it often isn’t.

The first few months can disappear into hospital appointments, rehabilitation and simply trying to adjust. With medical negligence, you may not initially realise that your injury or condition could be linked to something that went wrong with your treatment. By the time questions begin to form, valuable time may already have passed.

In England and Wales, most personal injury and medical negligence claims are subject to a three-year limitation period, but the clock does not always begin to run on the day of the accident or the day of treatment. Special rules apply in the cases of children and people who lack mental capacity, and it is sometimes possible for Courts to permit claims to go ahead after the deadline has passed.

Few things worry an injury lawyer more than a missed limitation deadline. Yet the simple three-year rule can mislead in both directions – some people have less time than they think, while others who assume they are too late may still have a claim worth investigating.

For most personal injury and clinical negligence claims, the Limitation Act 1980 gives you three years to bring court proceedings.

The three years run from the later of:

• the date on which the cause of action accrued, usually the date of the accident; or
• your “date of knowledge”.

In most road traffic collisions, accidents at work and other one-off accidents, you know immediately that you have been injured and what caused it. The practical rule is therefore usually three years from the date of the accident. The position is less straightforward where an injury develops later, or its cause is not initially apparent as may occur in a clinical negligence case where there has been perhaps a delay in diagnosis.

Limitation is separate from responsibility. An allegation of contributory negligence (i.e. that the accident or injuries are, in part, your own fault) may reduce the compensation recovered, but it does not remove the need to bring proceedings in time.

It’s a common misconception that a claim must be settled within three years. That’s not the case. Serious injury claims often continue for much longer while the medical evidence develops and the injured person’s long-term needs become clearer. The important thing is to protect the claim before the limitation period expires.

Crucially, you do not meet the limitation deadline simply by contacting a solicitor, sending a letter of claim or notifying an insurer or medical provider.

What matters is starting Court proceedings. Under the Civil Procedure Rules, proceedings normally start when the Court issues a Claim Form.

Where the general rule applies, if the Court receives a properly completed Claim Form before the deadline but issues it later, the claim is treated for limitation purposes as having been brought on the date the Claim Form was received by the Court. Certain online procedures use the date of issue instead. The correct procedure must therefore be followed, and it’s never wise to leave matters until the last moment assuming the Claim Form will be issued. If for any reason it were to be rejected by the Court and had to be resubmitted, this would need to be done before the expiry of the limitation date.

The same test applies to personal injury and medical negligence claims. It is recognised that you may not immediately realise how seriously you have been injured, what caused the injury or who may be responsible.

Put simply, your date of knowledge is when you first knew enough to connect a significant injury with the act or omission in question and identify the person or organisation against whom a claim might be made. In some cases, the identity of another person whose act or omission is relied upon will also matter.

The test is not confined to what you actually knew. It can include facts you could reasonably have discovered, sometimes with medical or other expert help. However, if a fact could be discovered only through expert advice and you have taken all reasonable steps to obtain and act on that advice, you are not treated as already knowing it.

Crucially, you do not need to know that what happened amounted in law to negligence, nuisance or breach of duty. The limitation period may therefore be running before you have an expert report, or a solicitor has confirmed that your claim has reasonable prospects of success.

In real life, there’s rarely a single light-bulb moment. More often, there’s a trail of symptoms, appointments and changing explanations, followed only later by a suspicion that an earlier accident or treatment caused the harm. The date of knowledge has to be worked out from that history.

Medical expert evidence may be essential to proving a claim. It does not follow that the three-year clock waits for the expert’s report.

The same three-year rule applies to medical negligence claims, although the date of knowledge is more often significant in practice.

Sometimes an injury caused by treatment is obvious immediately. In other cases, years may pass before someone knows enough to connect their injury with earlier care.

A scan may have been incorrectly reported as normal, with the problem discovered only when the condition is finally diagnosed. Someone experiencing continuing problems after surgery may initially be told that they are an unavoidable complication, only for later investigations to suggest another explanation.

The question is not simply when you first suspected negligence or when a solicitor told you that you might have a claim. It’s when you knew, or could reasonably have been expected to know enough of the relevant facts. You do not need to know that those facts amount in law to negligence.

That date can be difficult to identify, particularly where symptoms and medical explanations have evolved over time.

The ordinary three-year period does not run against a person under 18. A parent or another suitable adult can bring a claim on the child’s behalf before then as a litigation friend, and there are often good reasons to do so.

If no claim is brought during childhood, the three-year period will normally start on the person’s 18th birthday. The usual deadline is therefore their 21st birthday.

This is particularly relevant to serious childhood accidents and birth injury claims. A distant deadline is rarely a reason to wait. Evidence can disappear, memories fade and investigating the claim sooner may help a family obtain rehabilitation or financial support (either by way of a final settlement or interim payments whilst the claim continues) when it matters most.

Families sometimes worry that beginning a claim will place another burden on a child who is already dealing with a great deal. A specialist solicitor should explain the process carefully and keep the child’s immediate welfare at the centre of it.

Under the Limitation Act, a person may be treated as being under a legal disability if they lack capacity, within the meaning of the Mental Capacity Act 2005, to conduct the proceedings in question.

Where capacity is lacking when the cause of action arises, the normal limitation period does not begin and continues to not run during the period of disability. If or when the individual then later obtains the necessary capacity, the three-year limitation period will usually start at that time.

This does not mean that everyone with a brain injury, learning disability, dementia or mental health condition automatically has no deadline. Capacity depends on the individual’s ability to conduct the proceedings. Timing is also crucial – losing capacity after the cause of action accrued does not simply stop a limitation period that had already begun.

These issues can arise in serious brain injury claims as well as other claims and require tailored advice.

Yes, in some circumstances.

Section 33 of the Limitation Act 1980 gives the Court discretion to allow certain personal injury and clinical negligence claims to proceed after the normal limitation period has expired. Strictly speaking, the Court decides whether it would be equitable (fair) to disapply the time limit in that case.

There is no automatic extension; the Court takes into account all the circumstances, such as the length of the delay and the reasons for it, the effect that the delay has had on the evidence, the Defendant’s conduct, the speed with which the Claimant acted, and the steps which were taken to get legal or expert advice.

One practical question runs through many of those considerations – can both sides still investigate the case fairly? Missing records, untraceable witnesses and fading memories can make that harder.

I have spoken to people who begin by saying, “I know I’m probably too late, but…” I would not encourage anyone to reach that conclusion without advice. The date of knowledge may be disputed, the rules on disability may apply or Section 33 may be relevant. It really underlines the importance of taking specialist legal advice at the earliest opportunity.

No. The three-year rule is about bringing proceedings, not settling the claim.

This matters with life-changing injuries. Settling before the long-term effects are understood can leave future needs inadequately provided for. Those needs may include earnings, care, therapies, equipment, accommodation and pension loss, as our guide to calculating future financial losses explains.

If liability has been admitted and the other requirements are met, as mentioned above, interim payments can sometimes provide financial help before the final claim is resolved.

If the limitation deadline is close, proceedings may need to be issued before investigations or the pre-action process have finished. They can then sometimes be stayed while that work continues.

Claims following a death have their own rules.

If the individual’s death is linked to the negligence, then under the Fatal Accidents Act 1976, the normal period is three years from the date of death or, if later, the date of knowledge of the person for whose benefit the claim is brought.

If the death is not linked but a Claimant dies during the course of a claim or before the expiry of the three year limitation period, the period will automatically extend to three years from the date of death. However, if an individual has died but the claim was already time-barred before this, limitation will not be extended. Limitation in claims where someone has died must therefore be considered in each case rather than by simply counting three years from the date of death.

No. Separate schemes and specialist claims can have different deadlines.

For example, a Criminal Injuries Compensation Authority application is not an ordinary civil claim. Under the current scheme, an adult application will normally need to be made within two years of the incident, subject to separate rules and exceptions. Read more about criminal injury compensation claims.

Different rules can also apply to accidents abroad. The deadline may depend on where and how the accident happened, the defendant and, in some cases, an international convention. It can be considerably shorter than three years.

The three-year rule is a useful starting point for most personal injury and medical negligence claims in England and Wales, but it’s not universal.

Since 29 June 2026, the usual Limitation Act time limit has not applied to qualifying personal injury claims arising from sexual abuse suffered when the claimant was under 18. The change was made by Section 96 of the Crime and Policing Act 2026.

The new regime starts from a presumption that the claim should proceed, but the defendant can seek to show that a fair trial is no longer possible. It’s distinct from the limitation rules for other childhood injuries.

Because limitation is not the only thing that becomes more difficult with time. For example, witnesses may become difficult to find, memories less reliable, and CCTV may be deleted. Starting sooner can also help an injured person gain earlier access to rehabilitation, treatment, case management and interim funding.

In my experience, that practical help is usually every bit as important to an injured person and their family in the early stages as the eventual compensation figure.

A solicitor instructed shortly before a disputed deadline has fewer options. If time is already short, that should not deter you from seeking advice but ensure you mention it immediately.

The phrase “three-year time limit” is useful, but it’s only the beginning of the limitation question.

For many people, the deadline is three years from the accident. For others, the date of knowledge is later. Different rules apply to children and to people who lacked the necessary capacity when the cause of action arose. Section 33 may permit a late claim, while some injury claims have shorter deadlines.

If there’s any doubt, get the dates checked early. And if you already believe you are out of time, ask anyway. Limitation is too important, and sometimes too complicated, to decide by counting three years on a calendar and stopping there.