Can someone use a power of attorney for an SDLT return?
Power of attorney and SDLT
HMRC says an attorney needs a valid power that clearly covers SDLT matters before acting on a buyer’s behalf.
- Check the exact wording of the power.
- Do not rely only on mortgage terms.
- HMRC information remains confidential without proper authority.
Scroll down for the full analysis.
Read the original guidance here:
Can someone use a power of attorney for an SDLT return?
Someone else may deal with your stamp duty land tax return only where they have authority that is valid, covers SDLT matters, and permits that particular involvement. A general power to deal with a mortgage or property may not be enough.
What this rule is about
An SDLT return includes a declaration that the information is correct and complete, making it a serious confirmation when the buyer, or someone acting for them, submits it. HMRC therefore looks closely at whether the person signing or acting for a buyer has been given that job.
Life is not always simple. A buyer may be abroad, unwell, or unable to manage the paperwork. They may appoint an attorney to act for them. The key question is what the document actually allows that person to do.
Do not assume the heading answers it. A document called “Power of Attorney” can still be too limited for SDLT.
What the official source says
HMRC’s manual says that an attorney using a general power of attorney needs both a valid power and authority covering SDLT, with SDLT normally mentioned clearly in the deed. This is HMRC’s published view, rather than a rule created by the manual itself.
- The power of attorney must be valid.
- It must give the attorney power to deal with SDLT matters.
- HMRC normally expects SDLT to be named expressly in the document.
- Without suitable authority, HMRC says only the buyer or buyers can sign the return declaration.
The legislation says a return normally includes a declaration from each buyer, while also providing a separate route for an authorised agent on specified forms. Under that route, the buyer still makes the main declaration, apart from the effective date, while the agent declares that date is correct.
What this means in practice
Check the authority before preparing the return, rather than waiting until a problem appears. Where the attorney’s authority is unclear, a submitted return may not provide the confirmation HMRC expects.
This may also affect who HMRC will speak to. HMRC says taxpayer information is confidential. It will not share it with a mortgage lender or its representative merely because mortgage papers contain a section with a familiar title.
- Read the whole power, including any limits and conditions.
- Look for clear wording about SDLT, tax returns, and dealings with HMRC.
- Keep a signed copy ready if HMRC asks to see it.
- Do not treat a lender’s mortgage terms as automatic authority for tax matters.
That distinction can be frustrating. It can also prevent private tax information from being given to someone the buyer did not properly authorise.
How to analyse it
Begin with the document itself, then compare its exact terms with every task the attorney is expected to carry out for the buyer. Broad language about managing a home sale may help. HMRC’s manual says it will normally want SDLT authority to be explicit.
- Identify who must make the SDLT declaration.
- Check whether an attorney, rather than the buyer, is meant to act.
- Confirm which law governs the power of attorney.
- Check that the power was made validly and remains in force.
- Read the exact authority given for SDLT and HMRC dealings.
- Separate an attorney arrangement from the statutory agent-declaration route.
- Check whether HMRC information needs to be shared with another person.
If a mortgage provider says it can handle the return, ask which document gives it that power. The answer should be more than a clause hidden in standard mortgage terms.
Example
Ruth buys a home for £280,000 while working overseas. Her brother has a signed power allowing him to deal with bank accounts, the purchase, and the mortgage.
It says nothing about SDLT, tax returns, or HMRC. HMRC’s manual indicates that this wording may not show informed authority to deal with SDLT, even though it relates to the purchase.
Now change one fact. Ruth’s power also states that her brother may prepare, sign, submit, and discuss SDLT returns, as well as deal with HMRC about those returns. Subject to the power being valid, that is the sort of clear authority HMRC says it normally expects.
Why this can be difficult in practice
The difficult part is often not whether a document exists. It is what it means. Standard forms can use broad language, while SDLT is never mentioned. That leaves room for disagreement about the authority the buyer truly gave.
Mortgage terms are a common trap. HMRC says it has seen mortgage terms labelled “Power of Attorney” that neither meet the relevant requirements nor mention SDLT, despite their familiar title. On HMRC’s view, they do not authorise the lender or its agent to file a return for the buyer.
- A property-related power may not cover tax declarations.
- A lender’s authority to protect its loan may differ from authority to deal with SDLT.
- Several buyers may each need to give the necessary authority.
- A court may rectify an invalid power, but only if it makes an appropriate order.
Where a court order both rectifies the power and permits disclosure, HMRC says it can share information in line with that order. It also says a return can then be filed under the corrected power.
Key takeaways
- HMRC normally expects an attorney’s authority to mention SDLT clearly.
- Mortgage paperwork alone may not authorise SDLT action or information sharing.
- A valid court order may resolve an invalid power in some cases.
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 Schedule 10 para 1 — required contents and buyer declaration for returns
- FA 2003 Schedule 10 para 1A — agent declarations for specified return forms
- an Act of 2005 we do not have an identifier for section 18 — confidentiality of information held by HMRC (no link: an Act of 2005 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
- Whether a particular document is a valid power of attorney depends on its wording, how it was made, and the law that applies to it.
- A broad authority to deal with property or a mortgage may not clearly include authority to make SDLT declarations.
- The supplied Finance Act 2003 text is current only to 17 November 2025, so later legal changes need checking.
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 complete signed power of attorney or agency document
- Any mortgage terms said to give authority
- The proposed SDLT return and declaration
- Any court order rectifying the power or allowing disclosure
- Evidence of who gave authority and when
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 Can someone use a power of attorney for an SDLT return? [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 Schedule 10 para 1 - required contents and buyer declaration for returns https://www.legislation.gov.uk/ukpga/2003/14/schedule/10/paragraph/1/2025-11-17 - FA 2003 Schedule 10 para 1A - agent declarations for specified return forms https://www.legislation.gov.uk/ukpga/2003/14/schedule/10/paragraph/1A/2025-11-17 - an Act of 2005 we do not have an identifier for section 18 - confidentiality of information held by HMRC Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm31920 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. Guidance from HMRC is its 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 - Whether a particular document is a valid power of attorney depends on its wording, how it was made, and the law that applies to it. - A broad authority to deal with property or a mortgage may not clearly include authority to make SDLT declarations. - The supplied Finance Act 2003 text is current only to 17 November 2025, so later legal changes need checking. 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: Can someone use a power of attorney for an SDLT return?
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