Who Can Witness a Will in the UK? Rules and Common Mistakes

Your will must be signed by two witnesses who are present when you sign. Both witnesses must be over 18 and mentally capable. They cannot be anyone who benefits from your will or their spouse or civil partner.

If your witnesses are beneficiaries or married to beneficiaries, their signatures are still valid but they lose their inheritance. The rest of your will stands. Most wills fail because of witness mistakes, not because the will itself was badly written.

Getting witnesses right matters more than almost anything else when writing a will. A solicitor can fix unclear wording later during probate, but an invalid signature cannot be rescued.

Who can be a witness

Any adult over 18 who is not blind and can understand what they are doing can witness your will. They do not need to read the will or know what is in it. They only need to see you sign and confirm you are signing voluntarily.

Common witnesses include:

• Neighbours
• Colleagues at work
• Friends who are not in your will
• Your accountant, GP, or pharmacist
• A postmaster or bank cashier

You can use a solicitor or will-writer as a witness, but you are usually paying them anyway so it makes sense to get them to supervise the whole signing process rather than just witness.

Your witnesses do not need to be British citizens or UK residents. A visitor from abroad can witness your will as long as they meet the age and capacity rules. You do not need to use the same witnesses if you later write a new will or codicil.

Who cannot witness your will

The law is strict about who cannot be a witness because the witness rule protects you from being pressured into signing something you do not want to sign.

You cannot use anyone who benefits from your will. That includes:

• Anyone you leave money, property, or possessions to
• Anyone you appoint as executor if they also inherit something (being an executor alone is fine)
• Anyone you appoint as guardian to your children if they also receive a gift
• The spouse or civil partner of anyone who inherits

If your son inherits your house and his wife witnesses your will, your son loses the house. The same applies if you leave money to your sister and her husband witnesses the signature. The gift to your sister is void even though she did not witness it herself.

This rule does not apply to unmarried partners unless they are civil partners. If your daughter inherits and her boyfriend (not civil partner) witnesses, the gift stands. But using a partner as a witness is still risky because if they later marry, you would need to check the will again.

You also cannot use anyone under 18, anyone who cannot see you sign (because they are blind or not physically present), or anyone who lacks mental capacity to understand they are witnessing a legal document.

What happens if a beneficiary witnesses your will

The will remains valid. The witness signatures count. But the gift to that witness (or their spouse or civil partner) fails. The rest of your estate is distributed according to your will.

Example: you leave your estate equally between three children. Your daughter witnesses the will. She loses her third share. The other two children still inherit their shares. Your daughter's third usually falls into the residue of your estate, so it gets split between the remaining beneficiaries unless your will says otherwise.

If both witnesses are beneficiaries, both lose their gifts. If every beneficiary in your will is also a witness, your whole estate could pass under intestacy rules instead because there are no valid gifts left. That is why dying without a will can sometimes produce the same result as a badly witnessed one.

Some people assume that if a beneficiary witnesses in good faith without realising the rule, a court will overlook it. Courts do not. The law applies even if no one was trying to do anything wrong.

The signing process: what your witnesses must see

Witnessing is not just about signatures. The process matters as much as who signs.

You must sign your will in the presence of both witnesses. Both witnesses must be in the same room, able to see you sign. You do not need to sign in front of them at exactly the same moment — you can sign while both are watching, or you can sign and then acknowledge your existing signature to them while they watch.

If you signed your will last week and then ask two people to witness it today, that does not work. They must see you sign or see you acknowledge your signature. Acknowledging means you point to your signature and confirm it is yours and you intended to sign.

After you sign (or acknowledge), each witness signs in your presence and in the presence of the other witness. All three people must be together for the entire signing process. You cannot have witness one sign on Monday and witness two sign on Wednesday.

Your witnesses do not sign as witnesses to each other — they both witness you. But they must still be present when the other witness signs. If witness one leaves the room before witness two signs, the will may be invalid.

During COVID, temporary rules allowed video witnessing for a short period. Those rules ended in January 2024. You now need physical presence again. A witness watching you sign over Zoom does not count, even if you are both in the UK.

Practical mistakes people make

The most common mistake is using a beneficiary without realising it. You write your will leaving everything to your two children, then ask one of them to witness because they are sitting right there. That child loses their inheritance.

The second most common mistake is not having everyone in the same room. You sign in the kitchen, then take the will to your neighbour to witness, then take it to a friend. Neither witness saw you sign. The will is invalid.

Some people think the witnesses need to read the will. They do not. In fact, you can specifically ask them not to read it. The will is private. Witnesses confirm your signature and your intent to sign, nothing more.

Others think a witness needs to be independent in the sense of not knowing you. A close friend can be a perfectly good witness as long as they do not benefit from the will. Independence means not benefiting, not being a stranger.

Using an executor as a witness is usually fine, but only if the executor does not also inherit. Many wills appoint children as executors and leave them the estate. If those children witness the will, they can still act as executors but they lose their inheritance. Appointing and benefiting are two different things.

If you are unsure whether your executor will inherit, check the residue clause in your will. The residue is everything left after specific gifts and debts. Most estates pass through the residue, so if your executor is a residue beneficiary, do not use them as a witness.

When you might need a solicitor to supervise signing

You do not need a solicitor to witness a will, but there are situations where paying for supervised signing reduces risk.

If you are elderly or unwell, a future dispute might claim you lacked capacity or were pressured into signing. Having a solicitor as one witness (or supervising the process) creates evidence you knew what you were doing. The solicitor can write an attendance note confirming you gave instructions freely and understood the document.

If you are disinheriting close family, the risk of a challenge is higher. Someone might claim the will is forged or you were coerced. A solicitor's supervision makes that much harder to argue. The cost of a supervised signing is usually under £100, far less than the cost of a disputed will later.

If your will is complex — trusts, business assets, second marriages with children from previous relationships — errors in signing can be expensive to fix. A solicitor can make sure the process is done correctly first time. You can read more about when professional help makes sense in our guide on whether you need a solicitor for a will.

If you write your own will using a template or online service, you still need to get the signing right. The platform will usually give you step-by-step instructions. Follow them exactly. The most expensive wills to fix in probate are often homemade wills where the content is fine but the signing process was wrong.

Fixing a will with witness problems

If your witnesses were beneficiaries, you cannot fix it after you die. The loss of the gift is permanent. The only fix is to write a new will with proper witnesses while you are still alive.

If the signing process was invalid — for example, the witnesses were not all present together — the will fails entirely. Your estate passes under intestacy. There is no mechanism to validate an incorrectly witnessed will after death, even if it is obvious what you intended.

Probate registries sometimes accept a witness error if it is very minor and there is strong evidence of your intent, but they are not required to and usually will not. A missing signature, a witness under 18, or witnesses who were not present all invalidate the will.

If you discover a witness problem in your own will while you are still alive, the fix is simple: write a new will or add a codicil with correct witnesses. You do not need to redo the whole document unless you want to change the content. A codicil confirming the original will and correctly witnessed can save the earlier document.

Our guide on updating or changing your will explains how codicils work and when to use them instead of writing from scratch.

Witness details you need to record

Your will should include space for each witness to write their full name, address, and occupation after they sign. This is not legally required but it is standard practice and makes probate easier.

If a witness cannot be traced years later when you die, the executor may need to provide evidence the signature is genuine. If the will includes the witness's full details, tracking them down or confirming their signature is simpler.

Occupation does not mean you need witnesses from professional jobs. It just helps identify them. "Retired teacher" or "shop assistant" is fine. The address should be current when they sign, though it does not matter if they move later.

Some will templates include an attestation clause. This is a sentence above the witness signatures saying "signed by the testator in our presence and then by us in the presence of the testator and each other." This is not required by law but it is useful evidence the process was done correctly.

Witnesses do not need to date their signatures separately if the will itself is dated, but it does not hurt. If there is any later question about which of two wills is more recent, dated witness signatures can help.

Using the same witnesses for mirror wills

If you and your spouse or partner are writing mirror wills, you can use the same two witnesses for both documents. You do not need four different people.

Each person signs their own will in the presence of the two witnesses. Then the witnesses sign that will. Then the other person signs their will in the presence of the same two witnesses, who sign again. You end up with two wills, each with the same two witness signatures.

The witnesses must still be present for each signing. You cannot sign both wills at the same time. Each will is a separate document and must be signed separately, even if the content is almost identical.

If you are both leaving everything to each other with the same contingency beneficiaries, make sure those beneficiaries are not witnesses. The gift to them would fail in both wills.

This is general information, not legal advice. Wills and inheritance rules vary — for anything binding, use a regulated solicitor or will-writing service.