What documents are usually needed to submit an SDLT refund or reclaim to HMRC?

Introduction

People often want to know what paperwork is needed before a Stamp Duty Land Tax (SDLT) reclaim or refund application can be sent to HMRC. In practice, many delays happen not because the legal point is unclear, but because the supporting documents are incomplete, unsigned, or not in the right format.

This article explains, in general terms, the sort of document-gathering and signing process that often takes place before an SDLT reclaim is submitted. It also explains why agents commonly ask for proof of identity, a signed sale contract, and a properly signed authority form before they can act.

The Question

A taxpayer asked what was still needed to move an SDLT reclaim forward. The matter had reached the final stage before submission, but the adviser needed a few key items first. These included a dated and signed sale contract, proof of identity, and signed authority documents so that the claim could be formally prepared and sent to HMRC.

The taxpayer also wanted to check whether the signed documents and photographs of the signed authorisation were acceptable for submission.

Nick’s Explanation

Nick’s comments in the correspondence were practical rather than technical. The main point was that the process could only move forward once the supporting documents had been received in a usable form.

In anonymised terms, the explanation was that:

• the missing documents first had to be supplied;
• once those were received, the final authority and engagement documents could be prepared for signature;
• one document could be signed electronically, but the authority form needed a more formal signing process;
• a clear image of the signed authority was important, because poor copies often create avoidable delay;
• once everything had been properly signed and returned, the case could be sent to HMRC.

A fair summary of Nick’s point is: the legal argument may be ready, but HMRC will still expect the claim to be backed by the right evidence and authority.

The Law

SDLT is governed mainly by the Finance Act 2003. The precise documents needed for a reclaim depend on the type of relief, amendment, or repayment being sought, but HMRC will generally expect enough evidence to show:

• who the taxpayer is;
• what land transaction took place;
• when it took place;
• what SDLT was paid;
• why the amount paid is said to have been too high; and
• that the person making the claim is authorised to do so.

Where an agent acts for the taxpayer, HMRC may require evidence of authority before discussing the matter or processing a repayment. In practice, that usually means a signed authorisation or agent appointment document.

The legal basis for a reclaim may arise in different ways, for example:

• an amendment to an SDLT return within the statutory amendment window;
• a repayment claim where too much tax was paid;
• a claim based on the correct application of a relief or exemption;
• a refund following the replacement of a main residence;
• a claim that a property was not suitable for use as a dwelling at the effective date.

In any of those cases, HMRC will expect documentary support.

For unsuitable-for-use claims in particular, readers should note that the condition thresholds are now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. It is no longer enough to point to ordinary disrepair, dated condition, or works that a buyer planned to carry out. The issue is whether, at the effective date, the property truly failed the test of suitability for use as a dwelling on the stricter approach now confirmed by the Court of Appeal.

Analysis

The paperwork in this kind of case usually serves four separate functions.

First, it proves the transaction. A signed and dated sale contract helps show what was bought, by whom, and on what terms. That is often one of the core documents in any SDLT review because it anchors the legal transaction.

Second, it proves identity. If a repayment is being pursued, advisers commonly ask for identification documents to verify the taxpayer before acting. That is partly about compliance and partly about reducing the risk of fraud.

Third, it proves authority. Even if the taxpayer has discussed the matter with an adviser, HMRC may still require formal written authority before the adviser can correspond or receive information on the taxpayer’s behalf. A signed authorisation letter is therefore not just administrative; it can be essential.

Fourth, it supports the substance of the claim. If the reclaim depends on facts about the property or its condition, clear photographs and other contemporaneous evidence may matter. For example, in an unsuitable-for-use case, photographs, surveys, invoices, and completion-date evidence may all be relevant. But after Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, that evidence must show a genuinely serious level of unsuitability, not merely inconvenience, age, or the need for renovation.

That is why advisers often insist on clear copies and properly signed forms. A claim can be delayed or weakened if:

• the contract is unsigned or undated;
• the authority form is not signed in the required way;
• the scan or photograph is unclear;
• the identity evidence is missing; or
• the supporting evidence does not match the legal basis of the reclaim.

In the correspondence here, the practical sequence was straightforward: missing documents were requested, formal papers were then prepared for signature, the signed authority was checked, and only then was the claim sent to HMRC.

Outcome

The practical answer is that an SDLT reclaim usually cannot be submitted properly until the taxpayer has provided the essential transaction documents, proof of identity where needed, and a valid signed authority for the adviser to act.

If those documents are complete and legible, the claim can usually move to submission. If they are missing or defective, the case may stall before HMRC even considers the substantive tax issue.

Practical Steps

If you are trying to assess your own position, it is sensible to gather the following:

• the sale contract or transfer document, signed and dated where applicable;
• the SDLT return and SDLT5 certificate, if available;
• completion statements and proof of tax paid;
• proof of identity;
• a signed authority form if an agent is acting;
• any photographs, surveys, reports, invoices, or other evidence relevant to the basis of the reclaim;
• a short written timeline explaining the transaction and why you say too much SDLT was paid.

If the claim concerns whether a property was unsuitable for use as a dwelling, review the evidence carefully against the stricter position confirmed in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. The threshold is now relatively high, so the evidence needs to show more than ordinary repair issues or a need for improvement.

Also check time limits. SDLT amendments and repayment claims can be subject to strict statutory deadlines, and the correct route depends on the nature of the error or relief claimed.

Conclusion

The key point is simple: a good SDLT reclaim is not just about the legal argument. It also depends on having the right supporting documents, properly signed authority, and clear evidence that matches the claim being made. Without that, even a potentially valid refund case may be delayed or rejected.

Legal References Used

• Finance Act 2003
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799

This page was last updated on 22 March 2026.

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