What happens if you are partly at fault?
Last updated · By Mustafa Bilgic
How contributory negligence works
The principle comes from the Law Reform (Contributory Negligence) Act 1945. If you were partly responsible for the accident or for the extent of your injuries, your damages are reduced "to such extent as the court thinks just and equitable" — in practice, a percentage. Crucially, the burden is on the defendant to prove you were careless and that it contributed to the harm; it is not assumed.
Worked examples
| Full value of claim | Your share of fault | You receive |
|---|---|---|
| £20,000 | 0% | £20,000 |
| £20,000 | 25% | £15,000 |
| £20,000 | 50% | £10,000 |
| £100,000 | 15% | £85,000 |
Common situations and typical reductions
Some patterns recur, though every case turns on its facts:
- Not wearing a seatbelt — a well-known line of cases sets reductions of around 25% if the belt would have prevented the injury entirely, and about 15% if it would have made the injury less severe (and nil if it would have made no difference).
- Not wearing a motorcycle helmet or fastening it — similar reductions for head injuries.
- Pedestrians stepping out without looking — a share of blame, though drivers are often still held mostly liable (see our pedestrian accident calculator).
- Workers ignoring training or not using provided equipment — a reduction, though the employer’s underlying breach usually still carries most of the blame.
- Alcohol — for example accepting a lift from a driver you knew was drunk.
Fault for the accident vs fault for the injury
Contributory negligence can apply in two ways: you may have contributed to causing the accident (pulling out at a junction), or you may not have caused the accident at all but contributed to how badly you were hurt (not wearing a seatbelt). Both can reduce the award. The reduction reflects your responsibility for the damage, so a small piece of carelessness that greatly worsened the injury can still produce a meaningful reduction.
Should you still claim?
Almost always, yes. A reduced claim is still worth pursuing — 75% of a serious-injury award is a substantial sum. Insurers sometimes allege contributory negligence to drive down a settlement, so it is worth having a solicitor (regulated by the SRA) assess whether the allegation is fair. Claims are usually run on a no-win-no-fee basis, and the three-year time limit still applies. To see the full value of a claim before any reduction, use the free calculator. This guide is general information and not legal advice.
Frequently asked questions
Can I claim compensation if the accident was partly my fault?
Yes. Being partly at fault does not stop you claiming; it only reduces the award. This is called contributory negligence. The other side must prove you were careless and that it contributed to your injury, and your compensation is then cut by your percentage share of the blame. Even a 50% reduction can leave a substantial claim worth pursuing.
How much is compensation reduced if I was partly to blame?
By whatever percentage you were responsible. If your claim is worth £20,000 and you were 25% at fault, you receive £15,000; if you were 50% at fault, you receive £10,000. The percentage is decided by the court or agreed between the insurers based on how much each side contributed to the accident or the injury.
How much is the reduction for not wearing a seatbelt?
A long-standing line of cases sets a reduction of around 25% where wearing the seatbelt would have prevented the injury entirely, and about 15% where it would have made the injury less severe. If the seatbelt would have made no difference to the injury, there is no reduction. The same approach applies to motorcycle helmets.
What is split liability?
Split liability is where both parties are partly to blame for the accident itself, so responsibility is divided — for example 70/30 or 50/50. It is common in road and junction collisions. The effect on your compensation is the same as contributory negligence: your damages are reduced by your agreed share of the blame.
Who decides what percentage I was at fault?
If the claim settles, the insurers negotiate and agree the split based on the evidence. If it does not settle, a court decides, applying the Law Reform (Contributory Negligence) Act 1945 and comparing how much each party's carelessness contributed to the accident and the injury. The defendant carries the burden of proving you were contributorily negligent.