Quick answer
Three people sign a UK Lasting Power of Attorney: (1) the donor (you) signs first to create the LPA; (2) the certificate provider signs to confirm the donor understands and is acting freely (must be independent — known you 2+ years or a relevant professional); (3) each attorney (and replacement attorney) signs to accept the role. Each signature must be witnessed by an adult who is not the donor (for the attorneys’ signatures) or who is not an attorney (for the donor’s signature). Witness requirements: aged 18+, of sound mind, able to see the signing. The signing order matters — donor first, then certificate provider, then attorneys — and getting it wrong is the most common reason the Office of the Public Guardian rejects an LPA. This guide explains who signs a UK Power of Attorney in 2026 — the donor, certificate provider, attorneys, replacement attorneys and witnesses — with the strict signing order.
Last reviewed: 24 May 2026 by the MP Estate Planning editorial team. Jurisdiction: England and Wales. Scotland and Northern Ireland have different probate and intestacy rules; the IHT thresholds are UK-wide.
Three rule changes you may need to consider (2026/27)
1. Pensions become subject to IHT from 6 April 2027. Most unused defined-contribution pension pots currently sit outside the estate for IHT — that ends on 6 April 2027 (gov.uk policy paper). HMRC estimates around 10,500 estates will face IHT for the first time as a result.
2. Business and agricultural property reliefs capped at £2.5m per person from 6 April 2026. Above the cap, only 50% relief applies — effective IHT of 20%. AIM shares dropped to 50% relief and do not use the £2.5m allowance (Saffery — APR/BPR reforms).
3. The NRB, RNRB and £2m taper threshold are frozen until 5 April 2031 following the 2024 and 2025 Budgets (gov.uk — NRB and RNRB freeze). With inflation, more estates will be pulled into IHT each year — a process commonly called “fiscal drag.”
Who Signs Power of Attorney in the UK? A Complete Legal Guide
Setting up a Power of Attorney (POA) is a crucial step in estate planning, but many people are unsure about who signs Power of Attorney in the UK. Understanding who must sign—and in what order—is essential to ensure your document is legally valid and enforceable.
This comprehensive guide explains who signs a Power of Attorney, what role each person plays, and the legal steps required to complete the process correctly. Whether you’re the donor or an attorney, clarity around signatures is key to avoiding costly delays or rejection from the Office of the Public Guardian (OPG).
If you’re looking for expert help setting up a POA, you can book a free consultation with our team, or review our pricing to find the right service for you.
Understanding Who Signs a Power of Attorney
A Power of Attorney is a legal document that gives someone else (your attorney) the authority to make decisions on your behalf. To make it legally binding, several people must sign the document in a specific order, each fulfilling a specific legal function.
Key Parties Involved in Signing a POA
Here are the individuals who must sign a UK Power of Attorney:
- The Donor – The person granting authority
- The Certificate Provider – Confirms the donor understands and is not under pressure
- The Attorney(s) – The person(s) given legal power
- Witnesses – Independent parties who observe signatures
Each of these roles must be completed in a legally prescribed order, with specific rules around who is eligible to sign and how the signatures are witnessed.
Step-by-Step: Who Signs Power of Attorney and When
Let’s break down the process of who signs, when they do it, and what you need to be aware of.
1. The Donor Signs First
The donor is the person creating the Power of Attorney. They must sign the form first and confirm they understand what they’re doing.
- Signature Requirements: Must sign the LPA form (or OPG-approved template) in the presence of a witness.
- Witness: Must be 18 or older and not one of the attorneys.
2. The Certificate Provider Signs Next
This is an independent individual who confirms that the donor:
- Understands the POA
- Isn’t being pressured
- Is acting of their own free will
The certificate provider can be:
- A professional (solicitor, doctor, accountant, social worker)
- Someone who has known the donor personally for at least 2 years
They must sign after the donor and before the attorneys.
3. The Attorney(s) Sign
Each attorney named in the document must sign to confirm they accept the role and understand their responsibilities under the Mental Capacity Act 2005.
- Signature Requirements: Signed in the presence of a witness who is not the donor.
- Witness: Must be 18 or older and not involved in the POA.
Attorneys should not sign until the certificate provider has completed their part.
4. Witnesses Sign Throughout
Every signature—including those of the donor and attorneys—must be witnessed by someone who meets the legal requirements:
- Must be over 18
- Must not be the donor or any of the attorneys
- Must be present when the signature is made
Each witness must add their own name, signature, and address on the form.
Order of Signatures: Why It Matters
The signing order is critical. If the form is signed out of sequence or by ineligible individuals, it may be rejected by the Office of the Public Guardian. The correct order is:
- Donor signs (with witness)
- Certificate provider signs
- Attorney(s) sign (with witnesses)
Only once all parties have signed can the document be sent to the Office of the Public Guardian for registration.
How Long Do You Have to Complete All Signatures?
Once you start the POA process, all signatures should ideally be completed within a few weeks. The OPG advises that documents older than 12 months may be scrutinised more closely, especially if capacity issues are in question.
To avoid delays, it’s best to coordinate signatures quickly and register the document promptly.
Can a Power of Attorney Be Signed Online?
As of now, a Power of Attorney in the UK cannot be fully signed digitally. While the forms can be completed online via the GOV.UK portal, the final documents must still be:
- Printed
- Signed physically by hand
- Witnessed in person
The Ministry of Justice is piloting a digital LPA system, but full implementation is not yet live. Until then, physical signatures and witnesses are required.
Common Mistakes When Signing a POA
Incorrect signatures are a major reason for delays or rejected applications. Here are some key things to avoid:
- Wrong signing order
- Using the same witness for conflicting roles (e.g. donor and attorney)
- Witnessing a signature without being physically present
- Missing details like dates, addresses or witness signatures
If you’re unsure about any part of the process, it’s safer to seek legal support. Book a free consultation with our team to ensure everything is completed properly.
FAQs About Who Signs a Power of Attorney
Can the same person witness all signatures?
Yes, as long as they meet the legal requirements and are not the donor or one of the attorneys. However, they must be physically present for each signature.
Can family members sign as witnesses?
Yes, unless they are named as attorneys or donors. However, for impartiality, using someone independent is often recommended.
Can an attorney witness another attorney’s signature?
No. Attorneys cannot witness each other’s signatures. An independent adult must witness each attorney’s signing.
Can a certificate provider also be a witness?
Technically yes, but it is generally best to keep these roles separate to avoid any conflict of interest or risk of rejection.
Can I sign a POA if I don’t live in the UK?
Yes. Non-UK residents can be attorneys or witnesses, but the signing and witnessing must still meet UK legal requirements. Consider notarisation if signing abroad.
Conclusion: Why Signing Matters in a Power of Attorney
Knowing who signs Power of Attorney in the UK is vital for ensuring your legal document is valid, registered, and ready when you need it. From the donor to the certificate provider and attorneys, each signature plays a specific role—and must follow strict legal guidelines.
Whether you’re setting one up for yourself or helping a loved one, professional support can save time and reduce the risk of errors. At MP Estate Planning, we specialise in making the process seamless from start to finish.
Book a free consultation today to discuss your POA options or explore our fixed-fee pricing for complete peace of mind.
Who Is Legally Disqualified from Witnessing an LPA Signature?
Many guides treat witnessing rules as a matter of good practice, but under Schedule 1 of the Mental Capacity Act 2005, certain exclusions are statutory. Getting this wrong does not simply create a technical irregularity — it can invalidate the LPA entirely, requiring a fresh application and an additional registration fee. In our experience, witness disqualification is one of the most common reasons a completed LPA is rejected by the Office of the Public Guardian.
Statutory Exclusions Under the Mental Capacity Act 2005
The Mental Capacity Act 2005 and the accompanying Lasting Powers of Attorney, Enduring Powers of Attorney and Public Guardian Regulations 2007 set out who is legally prohibited from acting as a witness in specific sections of an LPA. The key statutory exclusions are:
- The donor’s signature — the attorney named in the LPA may not witness the donor’s signature. This applies to both named attorneys and replacement attorneys.
- The attorney’s signature — the donor may not witness an attorney’s signature, and one attorney may not witness another attorney’s signature on the same LPA.
- Any section — a person under the age of 18 is disqualified from acting as a witness to any signature on an LPA.
These are not recommendations — they are legal disqualifications. An LPA witnessed in breach of these rules will typically be returned or rejected by the OPG, meaning the process must begin again from scratch.
Can a Spouse or Civil Partner Act as a Witness?
This is an area of genuine confusion. A spouse or civil partner is not automatically disqualified from witnessing every signature — but the rules differ depending on which section is being signed. If the spouse is also a named attorney, they are disqualified from witnessing the donor’s signature under the statutory rules above. If they have no role in the LPA, they may generally act as a witness in practice, though our team would typically advise choosing an independent witness wherever possible to reduce the risk of any challenge to the LPA’s validity later. A spouse who is not an attorney, replacement attorney, or the certificate provider may witness a signature — but the relationship should be noted and considered carefully before proceeding.
Why the Certificate Provider Cannot Also Be a Witness
The certificate provider plays a distinct and protected role in the LPA: they confirm that the donor understands the document and is not being pressured into signing. Allowing the same person to act as both certificate provider and witness would undermine the independence that role is designed to guarantee. The OPG guidance on making a lasting power of attorney makes clear that these are separate functions requiring separate individuals. In our experience, conflating the two roles is a mistake that can be easy to make when a small number of trusted people are involved in the signing process — and it is one that causes real delays.
Common Questions About Witnessing a Power of Attorney
Who cannot be a witness to a signature?
Under Schedule 1 of the Mental Capacity Act 2005, an attorney named in the LPA cannot witness the donor’s signature, and the donor cannot witness an attorney’s signature. No one under 18 may witness any signature on an LPA. Beyond these statutory disqualifications, the certificate provider, replacement attorneys, and — where they hold any role in the document — spouses or civil partners of attorneys are generally considered unsuitable witnesses, even if not always expressly prohibited by statute. The OPG may reject an LPA where witnessing appears to compromise the independence of the process.
Why can’t a family member be a witness?
There is no blanket statutory prohibition on family members acting as witnesses, but the concern is one of independence and potential challenge. A family member who is also an attorney is disqualified by statute. A family member with no role in the LPA may technically witness a signature, but our team would generally advise against it where any question of undue influence might later arise. An independent witness — a neighbour, colleague, or friend with no financial interest in the estate — is a more defensible choice and less likely to prompt scrutiny if the LPA is ever challenged.
Can two attorneys witness each other’s signature?
No. This is a statutory disqualification under Schedule 1 of the Mental Capacity Act 2005. Where an LPA appoints more than one attorney, each attorney must have their signature witnessed by a separate, independent person. In practice, this means that if you are arranging a signing meeting with multiple attorneys present, you will need to ensure that sufficient independent witnesses are also available. Overlooking this is a common error that leads to rejection and re-registration — at a current OPG fee of £82 per LPA, the financial cost of restarting is real, quite apart from the time lost during the OPG’s typical processing period of around four weeks or more.
Who can witness a power of attorney signature in the UK?
Any person aged 18 or over who is not an attorney, replacement attorney, or the donor themselves may generally act as a witness — provided they have no interest in the LPA and are not disqualified by any of the statutory rules above. The witness must be physically present at the time of signing; remote or electronic witnessing is not currently permitted for LPAs in England and Wales. A solicitor, GP, social worker, or trusted independent adult are all commonly used.
How much would a solicitor charge to witness a signature?
Solicitor fees for witnessing and overseeing LPA signing vary considerably, but you might typically expect to pay anywhere from £100 to £300 or more for professional involvement in the signing process, depending on the firm and the level of service provided. This is separate from, and in addition to, the OPG registration fee of £82 per LPA (correct as of 2024). Whether instructing a solicitor is worthwhile depends on your circumstances. Where capacity may be questioned later, where family relationships are complex, or where a previous LPA has been rejected, professional oversight of the signing process is generally money well spent. For straightforward cases where all parties are confident in the rules, a carefully managed DIY approach is entirely reasonable — but our team would always recommend a final check of the completed forms before submission to avoid the cost and delay of restarting the process.