What knock-for-knock actually means
Your insurer used a term you had not heard before and you want it explained simply.
Knock-for-knock is an arrangement between insurers where each pays its own policyholder’s vehicle damage. Neither side argues over who caused the accident first. It exists to get straightforward repairs moving quickly, rather than to establish who was actually at fault.
Why insurers use this arrangement
Disputing fault for every minor accident is slow and costly for insurers on both sides. Agreeing in advance to each cover their own policyholder avoids that argument for routine vehicle damage.
This usually gets your car repaired faster than waiting on a fault dispute to resolve first. For a minor bump with clear, everyday damage, that speed is the whole point of the arrangement.
What it does not decide
This is the part worth understanding clearly. Knock-for-knock settles who pays for the vehicle repair, nothing more.
It does not decide who was legally at fault for the accident, even though the word “knock” suggests otherwise. Fault can still matter for other purposes, even where the repair itself is settled quickly under this arrangement.
If you were also injured, that claim runs on its own track against the driver actually at fault. Knock-for-knock has no bearing on an injury claim at all.
The effect on your no-claim discount
Your own insurer is the one paying under this arrangement. Because of that, it can still be recorded against your policy even where you were not at fault.
Your no-claim discount and a claim goes into this in more detail, since it catches many claimants by surprise.
When this arrangement does not apply
Insurers can and do step outside knock-for-knock in some situations. Where liability is clearly one-sided, or the vehicle damage is significant, an insurer may choose to pursue the other insurer directly instead.
Whether it applies in your case depends on the practice of both insurers involved. It is not a fixed rule you can rely on in advance, and different insurer pairings can behave differently even in similar accidents.
What this means for you practically
If your insurer mentions this term, ask directly whether it will affect your no-claim discount before agreeing to proceed. Getting a clear answer now avoids a surprise later.
For any injury from the same accident, treat that as a separate matter entirely. Claiming for your own vehicle damage and the wider road accident claim process cover that side properly.
Common questions
What does knock-for-knock actually mean?
It is an arrangement between insurers to each pay their own policyholder's vehicle damage without first arguing over who was at fault. It is designed to get repairs moving faster, not to decide blame.
Does knock-for-knock mean nobody was at fault?
No. It simply means the insurers agreed to skip the argument over fault for the purpose of paying the vehicle damage. Fault can still matter for a separate injury claim, which knock-for-knock does not touch at all.
Will this affect my no-claim discount even though I was not at fault?
It can, depending on how your insurer records a claim paid under this arrangement. See [your no-claim discount and a claim](/ncd-and-claims/) for how to think about this before you decide how to proceed.
Does knock-for-knock always apply?
No. Insurers can step outside the arrangement where liability is heavily one-sided or the amount is large, and pursue the other insurer directly instead. Whether it applies to your case depends on both insurers involved.