What a power of attorney is and when you need one
A power of attorney (POA) is a legal document by which one person — the principal (US) or donor (UK) — authorises another person — the agent (US) or attorney (UK) — to act on their behalf. POAs are everyday legal tools: collecting a parcel, selling a car, managing a bank account during a long absence, signing closing documents on a property abroad, or putting long-term arrangements in place in case of future incapacity.
The main types — UK
Powers of attorney in England and Wales are governed by the Powers of Attorney Act 1971 (ordinary POAs) and the Mental Capacity Act 2005 (lasting POAs). Scotland and Northern Ireland have their own equivalent regimes (Adults with Incapacity (Scotland) Act 2000; Enduring Powers of Attorney (Northern Ireland) Order 1987).
- Ordinary (general) POA: for one-off transactions or a fixed period. Valid only while the donor has mental capacity. Often used for property transactions or while the donor is overseas
- Lasting Power of Attorney (LPA): created under the Mental Capacity Act 2005. Two types — Property and Financial Affairs and Health and Welfare. Must be registered with the Office of the Public Guardian (OPG) before it can be used. Survives loss of mental capacity
- Enduring Power of Attorney (EPA): the predecessor to the LPA. Still valid if it was made before 1 October 2007, but covers only property and financial affairs and must be registered with the OPG once the donor starts to lose capacity
The main types — US
POAs in the US are governed by state law. Most states have adopted some form of the Uniform Power of Attorney Act (UPOAA) — currently 30+ jurisdictions — but a handful (notably California, Florida, New York, Texas) have their own bespoke statutes. Always check the state where the document will be used.
- General POA: broad authority over financial and legal matters. Terminates automatically on the principal's incapacity unless made durable
- Durable POA: contains specific "durability" language ("This power of attorney shall not be affected by my subsequent disability or incapacity") and survives the principal's loss of capacity
- Limited / special POA: for a single transaction or a defined matter — selling one piece of property, signing one contract
- Springing POA: takes effect only on a defined event, usually the principal's incapacity certified by a physician. Not allowed in every state
- Healthcare POA / Advance Healthcare Directive: a separate document covering medical decisions, often combined with a living will
What the document must contain
- Full identification of principal/donor and agent/attorney (legal names, dates of birth, addresses)
- The exact scope of authority — be specific; vague POAs are routinely rejected by banks
- The start date and any end date or triggering condition
- Whether the power is durable (US) or whether it is registered with the OPG (UK LPA)
- Signature of the principal/donor
- Witness or notarisation as the jurisdiction requires
Witness, notary and registration requirements
UK: an ordinary POA must be signed and witnessed (not by the attorney). For a property transaction, it should be executed as a deed under section 1 of the Powers of Attorney Act 1971. An LPA must be signed by the donor, an independent certificate provider, and the attorneys, and registered with the OPG before it can be used. Registration costs £82 per LPA (April 2024 fee).
US: nearly every state requires notarisation of a durable POA, and many additionally require two witnesses. Some states (Florida, for example) require both. A few states (Pennsylvania) require an "acknowledgement and notice" signed by the agent. POAs intended for use abroad usually need an apostille under the Hague Convention.
What banks and other institutions actually accept
Even a perfectly drafted POA can be refused by a bank or land registry if it is not specific, not recent, or not in the institution's preferred form. Practical tips:
- Use the bank's own POA form whenever possible
- State the specific account number or transaction in the scope
- Keep the POA recent (within 6–12 months for many institutions)
- Bring or attach the principal's photo ID
- For overseas use, get an apostille
When to use a solicitor or attorney
For everyday tasks (collecting a parcel, signing for delivery, selling a used car), a properly drafted POA template is fine. For matters with long-term consequences — incapacity planning, property purchase, business sale, healthcare decisions — engage a solicitor (UK) or a licensed attorney (US). The cost of a properly executed LPA or durable POA is trivial compared to the cost of an invalid one.
Common mistakes
- Leaving the scope of authority vague — banks will refuse it
- Forgetting the witness or notary signature — voids the document
- Using a US template in the UK or vice versa
- Failing to register an LPA with the OPG before trying to use it
- Not adding the agent as an authorised signatory at the bank in advance
- Forgetting that the POA terminates automatically on the principal's death — at that point the executor of the estate takes over
What Lettrio generates for you in 30 seconds
Our AI produces a clearly structured POA with the right type and scope for your situation, witness and notary lines for your jurisdiction, and an enclosure list (ID, supporting documents). For routine transactions, ready to sign and use. For LPAs, durable POAs and other long-term matters, we recommend a solicitor or licensed attorney review. PDF ready in 30 seconds — first letter free.