Stamp duty and irrevocable powers of attorney given as security
Secured powers of attorney and SDLT
HMRC says a power of attorney given as security may be irrevocable. It may allow another person to make an SDLT declaration, but it does not itself change the tax due.
- Read the power and the linked agreement together.
- Check that the authority is written and signed.
- HMRC’s wording is illustrative rather than compulsory.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty and irrevocable powers of attorney given as security
Stamp duty and irrevocable powers of attorney given as security
A power of attorney may allow someone to act for you on stamp duty paperwork.
Where a power is given as security for that person’s interest, it may stop you withdrawing it without that person’s consent. This can apply even if it authorises action on stamp duty paperwork. That issue is separate from SDLT.
What this rule is about
Although the person who gives a power can normally cancel it, a secured power may instead support an agreement that protects the recipient’s own interest under it. That difference matters.
For SDLT, an individual may use a written and signed power of attorney to authorise another person to make the required declaration.
By making it, the person confirms that, to the best of the buyer’s knowledge, the return is correct and complete in every relevant respect at that point. That is the required confirmation.
What the official source says
HMRC states in its manual that a person may give a power as security for the attorney’s interest. Here, the attorney is the person who receives the power, even where that person is not a lawyer or qualified to practise law. The term is functional.
- A secured power may be described as irrevocable.
- That means the person who gave it cannot withdraw it alone.
- For this type of power, HMRC points to section 4 of the Powers of Attorney Act 1971.
- HMRC’s example says withdrawal needs the attorney’s consent.
- The example also says the power secures duties owed under a named agreement.
- HMRC says other wording can work if it has the same effect.
What this means in practice
Do not treat the word “irrevocable” alone as conclusive. Read the full document and the agreement behind it. Consider why the power was granted and whose interest it protects.
- Check that the power is in writing and signed by the individual.
- Check who is allowed to act under it.
- Identify the agreement named in the power.
- Check whether the secured duties are still unpaid or unfinished.
- Keep the document with the SDLT file if someone signs the declaration for you.
How to analyse it
First establish whether someone is making an SDLT declaration for an individual, because that determines whether the document must give that person authority to act. Start there.
Next, check for that authority. Consider whether the power serves as security only after doing so.
- Who gave the power, and who received it?
- What SDLT action is the other person meant to take?
- Does the document clearly give that authority?
- Is the power said to secure an interest or an agreement?
- Does it limit withdrawal without the other person’s consent?
- Does the wording have the same effect as HMRC’s example?
Example
Under a loan agreement, Sam signs a power that lets a lender act for him, and the document states that it is security for Sam’s duties under that agreement. That is its stated role.
It also stops Sam withdrawing the power unless the lender agrees to the withdrawal. This matters.
HMRC’s manual treats this as the kind of secured, irrevocable power covered by its example. It does not, by itself, determine Sam’s SDLT bill.
Why this can be difficult in practice
People often misunderstand this. A power may be broad enough to permit someone to act but still fail to show clearly that it serves as security. Labels alone are insufficient. The wording itself and the related agreement both matter.
- A document may use different words from HMRC’s example.
- The agreement may not clearly state what the power secures.
- The attorney’s protected interest may have ended.
- HMRC’s manual does not give a full test for alternative wording.
Key takeaways
- A secured power of attorney may be irrevocable.
- HMRC’s sample wording is an example, not a required form.
- A secured power does not itself change the SDLT due.
Technical analysis
For advisers, and for anyone who wants to check the law behind this page. You do not need this section to understand the guidance above.
Legislation
- FA 2003 section 81B — when an authorised person may make SDLT declarations
- FA 2003 Schedule 10 para 1 — declaration that an SDLT return is correct
- an Act of 1971 we do not have an identifier for section 4 — secured powers that cannot be withdrawn (no link: an Act of 1971 we do not have an identifier for)
Official guidance
The pages below are HMRC’s guidance. Guidance is not law. It sets out how HMRC reads the legislation, and it is not binding on you, on a tribunal or on a court. Where guidance and the legislation differ, the legislation wins. HMRC can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- The supplied HMRC page does not explain how far wording may differ while having the same legal effect.
- The current text and application of section 4 of the Powers of Attorney Act 1971 should be checked before relying on a document for a live transaction.
Evidence you would need
This kind of case is decided on the facts of the individual property. These are the records that usually settle it, and the ones an adviser would ask you for.
- The signed power of attorney.
- The agreement whose obligations the power is said to secure.
- Evidence of the attorney’s interest and whether those obligations remain outstanding.
- The SDLT return and the declaration being made.
Explore this with an AI
Readers often want to test their own situation. Copy the prompt below into ChatGPT, Claude or Gemini. It hands the model the actual legislation for this page rather than letting it answer from memory, and tells it to be explicit about what is uncertain. What comes back is information, not advice – check it against the links above.
I am researching UK Stamp Duty Land Tax (SDLT), which applies in England and Northern Ireland. MY QUESTION Stamp duty and irrevocable powers of attorney given as security [Replace this with your own situation: what you are buying, the price, the dates, who the buyer is, and what you plan to do with the property.] THE LAW THIS TURNS ON - FA 2003 section 81B - when an authorised person may make SDLT declarations https://www.legislation.gov.uk/ukpga/2003/14/section/81B/2025-11-17 - FA 2003 Schedule 10 para 1 - declaration that an SDLT return is correct https://www.legislation.gov.uk/ukpga/2003/14/schedule/10/paragraph/1/2025-11-17 - an Act of 1971 we do not have an identifier for section 4 - secured powers that cannot be withdrawn HMRC's guidance page on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm31915 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. HMRC guidance is HMRC's view of the law, not the law, and does not bind a tribunal or a court. 2. Tell me what the rule actually requires, in plain English. 3. Tell me which facts decide the answer, and which facts would change it. 4. Tell me what evidence I would need to support the position. 5. Be explicit about anything unsettled or fact-sensitive. Do not guess. 6. Your training data has a cutoff and SDLT rates and reliefs change at fiscal events. Say so if you are not sure the law is current. POINTS ALREADY KNOWN TO BE UNCERTAIN ON THIS TOPIC - The supplied HMRC page does not explain how far wording may differ while having the same legal effect. - The current text and application of section 4 of the Powers of Attorney Act 1971 should be checked before relying on a document for a live transaction. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show Finance Act 2003 as it stood on 2025-11-17. The law may have changed since, and the rules that apply are those in force on the date of your transaction. The official guidance this page is based on is here.
This page was last updated on 1 September 2026
Useful article? You may find it helpful to read the original guidance here: Stamp duty and irrevocable powers of attorney given as security
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